Articles | Volume 22, issue 7
https://doi.org/10.5194/acp-22-4867-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-22-4867-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
| 
12 Apr 2022
Research article | Highlight paper |
| 12 Apr 2022
| 12 Apr 2022
Interactions between the stratospheric polar vortex and Atlantic circulation on seasonal to multi-decadal timescales
Oscar Dimdore-Miles
CORRESPONDING AUTHOR
Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford OX1 3PU, UK
Lesley Gray
Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford OX1 3PU, UK
National Centre for Atmospheric Science, Leeds LS2 9PH, UK
Scott Osprey
Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford OX1 3PU, UK
National Centre for Atmospheric Science, Leeds LS2 9PH, UK
Jon Robson
National Centre for Atmospheric Science, Leeds LS2 9PH, UK
Department of Meteorology, University of Reading, Reading RG6 6ET, UK
Rowan Sutton
National Centre for Atmospheric Science, Leeds LS2 9PH, UK
Department of Meteorology, University of Reading, Reading RG6 6ET, UK
Bablu Sinha
National Oceanography Centre, University of Southampton Waterfront Campus European Way, Southampton SO14 3ZH, UK
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Weather Clim. Dynam., 2, 205–231, https://doi.org/10.5194/wcd-2-205-2021, https://doi.org/10.5194/wcd-2-205-2021, 2021
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Observations of the stratosphere span roughly half a century, preventing analysis of multi-decadal variability in circulation using these data. Instead, we rely on long simulations of climate models. Here, we use a model to examine variations in northern polar stratospheric winds and find they vary with a period of around 90 years. We show that this is possibly due to variations in the size of winds over the Equator. This result may improve understanding of Equator–polar stratospheric coupling.
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Oscar Dimdore-Miles, Lesley Gray, and Scott Osprey
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Adam T. Blaker, Manoj Joshi, Bablu Sinha, David P. Stevens, Robin S. Smith, and Joël J.-M. Hirschi
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Rowan T. Sutton and Ed Hawkins
Earth Syst. Dynam., 11, 751–754, https://doi.org/10.5194/esd-11-751-2020, https://doi.org/10.5194/esd-11-751-2020, 2020
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Jorge L. García-Franco, Lesley J. Gray, and Scott Osprey
Weather Clim. Dynam., 1, 349–371, https://doi.org/10.5194/wcd-1-349-2020, https://doi.org/10.5194/wcd-1-349-2020, 2020
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The American monsoon system is the main source of rainfall for the subtropical Americas and an important element of Latin American agriculture. Here we use state-of-the-art climate models from the UK Met Office in different configurations to analyse the performance of these models in the American monsoon. Resolution is found to be a key factor to improve monsoon representation, whereas integrated chemistry does not improve the simulated monsoon rainfall.
Rowan T. Sutton
Earth Syst. Dynam., 9, 1155–1158, https://doi.org/10.5194/esd-9-1155-2018, https://doi.org/10.5194/esd-9-1155-2018, 2018
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David Storkey, Adam T. Blaker, Pierre Mathiot, Alex Megann, Yevgeny Aksenov, Edward W. Blockley, Daley Calvert, Tim Graham, Helene T. Hewitt, Patrick Hyder, Till Kuhlbrodt, Jamie G. L. Rae, and Bablu Sinha
Geosci. Model Dev., 11, 3187–3213, https://doi.org/10.5194/gmd-11-3187-2018, https://doi.org/10.5194/gmd-11-3187-2018, 2018
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We document the latest version of the shared UK global configuration of the
NEMO ocean model. This configuration will be used as part of the climate
models for the UK contribution to the IPCC 6th Assessment Report.
30-year integrations forced with atmospheric forcing show that the new
configurations have an improved simulation in the Southern Ocean with the
near-surface temperatures and salinities and the sea ice all matching the
observations more closely.
Lesley J. Gray, James A. Anstey, Yoshio Kawatani, Hua Lu, Scott Osprey, and Verena Schenzinger
Atmos. Chem. Phys., 18, 8227–8247, https://doi.org/10.5194/acp-18-8227-2018, https://doi.org/10.5194/acp-18-8227-2018, 2018
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Neal Butchart, James A. Anstey, Kevin Hamilton, Scott Osprey, Charles McLandress, Andrew C. Bushell, Yoshio Kawatani, Young-Ha Kim, Francois Lott, John Scinocca, Timothy N. Stockdale, Martin Andrews, Omar Bellprat, Peter Braesicke, Chiara Cagnazzo, Chih-Chieh Chen, Hye-Yeong Chun, Mikhail Dobrynin, Rolando R. Garcia, Javier Garcia-Serrano, Lesley J. Gray, Laura Holt, Tobias Kerzenmacher, Hiroaki Naoe, Holger Pohlmann, Jadwiga H. Richter, Adam A. Scaife, Verena Schenzinger, Federico Serva, Stefan Versick, Shingo Watanabe, Kohei Yoshida, and Seiji Yukimoto
Geosci. Model Dev., 11, 1009–1032, https://doi.org/10.5194/gmd-11-1009-2018, https://doi.org/10.5194/gmd-11-1009-2018, 2018
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This paper documents the numerical experiments to be used in phase 1 of the Stratosphere–troposphere Processes And their Role in Climate (SPARC) Quasi-Biennial Oscillation initiative (QBOi), which was set up to improve the representation of the QBO and tropical stratospheric variability in global climate models.
Verena Schenzinger, Scott Osprey, Lesley Gray, and Neal Butchart
Geosci. Model Dev., 10, 2157–2168, https://doi.org/10.5194/gmd-10-2157-2017, https://doi.org/10.5194/gmd-10-2157-2017, 2017
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The Quasi-Biennial Oscillation (QBO) is a pattern of winds in the equatorial stratosphere that has been observed for the past 60 years. It is thought to have long-range influences, e.g. on the Northern Hemisphere winter polar vortex and therefore Europe's winter weather. Since its period is about 2 years, being able to predict the QBO might also improve weather forecasting. Using a set of characteristic metrics, this paper examines how reliable current climate models are in simulating the QBO.
Daniel B. Williamson, Adam T. Blaker, and Bablu Sinha
Geosci. Model Dev., 10, 1789–1816, https://doi.org/10.5194/gmd-10-1789-2017, https://doi.org/10.5194/gmd-10-1789-2017, 2017
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We present a method from the statistical science literature to assist in the tuning of global climate models submitted to CMIP. We apply the method to the NEMO ocean model and find choices of its free parameters that lead to improved representations of depth integrated global mean temperature and salinity. We argue against automatic tuning procedures that involve optimising certain outputs of a model and explain why our method avoids common difficulties with/arguments against automatic tuning.
Masatomo Fujiwara, Jonathon S. Wright, Gloria L. Manney, Lesley J. Gray, James Anstey, Thomas Birner, Sean Davis, Edwin P. Gerber, V. Lynn Harvey, Michaela I. Hegglin, Cameron R. Homeyer, John A. Knox, Kirstin Krüger, Alyn Lambert, Craig S. Long, Patrick Martineau, Andrea Molod, Beatriz M. Monge-Sanz, Michelle L. Santee, Susann Tegtmeier, Simon Chabrillat, David G. H. Tan, David R. Jackson, Saroja Polavarapu, Gilbert P. Compo, Rossana Dragani, Wesley Ebisuzaki, Yayoi Harada, Chiaki Kobayashi, Will McCarty, Kazutoshi Onogi, Steven Pawson, Adrian Simmons, Krzysztof Wargan, Jeffrey S. Whitaker, and Cheng-Zhi Zou
Atmos. Chem. Phys., 17, 1417–1452, https://doi.org/10.5194/acp-17-1417-2017, https://doi.org/10.5194/acp-17-1417-2017, 2017
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We introduce the SPARC Reanalysis Intercomparison Project (S-RIP), review key concepts and elements of atmospheric reanalysis systems, and summarize the technical details of and differences among 11 of these systems. This work supports scientific studies and intercomparisons of reanalysis products by collecting these background materials and technical details into a single reference. We also address several common misunderstandings and points of confusion regarding reanalyses.
Helene T. Hewitt, Malcolm J. Roberts, Pat Hyder, Tim Graham, Jamie Rae, Stephen E. Belcher, Romain Bourdallé-Badie, Dan Copsey, Andrew Coward, Catherine Guiavarch, Chris Harris, Richard Hill, Joël J.-M. Hirschi, Gurvan Madec, Matthew S. Mizielinski, Erica Neininger, Adrian L. New, Jean-Christophe Rioual, Bablu Sinha, David Storkey, Ann Shelly, Livia Thorpe, and Richard A. Wood
Geosci. Model Dev., 9, 3655–3670, https://doi.org/10.5194/gmd-9-3655-2016, https://doi.org/10.5194/gmd-9-3655-2016, 2016
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We examine the impact in a coupled model of increasing atmosphere and ocean horizontal resolution and the frequency of coupling between the atmosphere and ocean. We demonstrate that increasing the ocean resolution from 1/4 degree to 1/12 degree has a major impact on ocean circulation and global heat transports. The results add to the body of evidence suggesting that ocean resolution is an important consideration when developing coupled models for weather and climate applications.
C. J. Wright, S. M. Osprey, and J. C. Gille
Atmos. Chem. Phys., 15, 8459–8477, https://doi.org/10.5194/acp-15-8459-2015, https://doi.org/10.5194/acp-15-8459-2015, 2015
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Data from the HIRDLS instrument are used to study the numerical variability of gravity waves. Observed distributions are dominated by long-vertical-short-horizontal-wavelength waves, with a similar spectral form at all locations. We further divide our data into subspecies by wavelength, and investigate variation in these subspecies in time and space. We show that the variations associated with particular phenomena arise due to changes in specific parts of the spectrum.
A. Megann, D. Storkey, Y. Aksenov, S. Alderson, D. Calvert, T. Graham, P. Hyder, J. Siddorn, and B. Sinha
Geosci. Model Dev., 7, 1069–1092, https://doi.org/10.5194/gmd-7-1069-2014, https://doi.org/10.5194/gmd-7-1069-2014, 2014
J. J.-M. Hirschi, A. T. Blaker, B. Sinha, A. Coward, B. de Cuevas, S. Alderson, and G. Madec
Ocean Sci., 9, 805–823, https://doi.org/10.5194/os-9-805-2013, https://doi.org/10.5194/os-9-805-2013, 2013
Related subject area
Subject: Dynamics | Research Activity: Atmospheric Modelling and Data Analysis | Altitude Range: Stratosphere | Science Focus: Physics (physical properties and processes)
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A mountain ridge model for quantifying oblique mountain wave propagation and distribution
Weakening of the tropical tropopause layer cold trap with global warming
On the magnitude and sensitivity of the quasi-biennial oscillation response to a tropical volcanic eruption
The response of the North Pacific jet and stratosphere-to-troposphere transport of ozone over western North America to RCP8.5 climate forcing
The Holton–Tan mechanism under stratospheric aerosol intervention
Very-long-period oscillations in the atmosphere (0–110 km) – Part 2: Latitude– longitude comparisons and trends
Driving mechanisms for the El Niño–Southern Oscillation impact on stratospheric ozone
Exploring the link between austral stratospheric polar vortex anomalies and surface climate in chemistry-climate models
The impact of improved spatial and temporal resolution of reanalysis data on Lagrangian studies of the tropical tropopause layer
Dynamics of ENSO-driven stratosphere-to-troposphere transport of ozone over North America
Ozone–gravity wave interaction in the upper stratosphere/lower mesosphere
How can Brewer–Dobson circulation trends be estimated from changes in stratospheric water vapour and methane?
The semi-annual oscillation (SAO) in the upper troposphere and lower stratosphere (UTLS)
Impacts of three types of solar geoengineering on the Atlantic Meridional Overturning Circulation
Enhanced upward motion through the troposphere over the tropical western Pacific and its implications for the transport of trace gases from the troposphere to the stratosphere
Evolution of the intensity and duration of the Southern Hemisphere stratospheric polar vortex edge for the period 1979–2020
Characterization of transport from the Asian summer monsoon anticyclone into the UTLS via shedding of low potential vorticity cutoffs
Long-range prediction and the stratosphere
Weakening of Antarctic stratospheric planetary wave activities in early austral spring since the early 2000s: a response to sea surface temperature trends
The impact of sulfur hexafluoride (SF6) sinks on age of air climatologies and trends
Specified dynamics scheme impacts on wave-mean flow dynamics, convection, and tracer transport in CESM2 (WACCM6)
Propagation paths and source distributions of resolved gravity waves in ECMWF-IFS analysis fields around the southern polar night jet
Observation and modeling of high-7Be concentration events at the surface in northern Europe associated with the instability of the Arctic polar vortex in early 2003
Eastward-propagating planetary waves in the polar middle atmosphere
The Brewer–Dobson circulation in CMIP6
Climate impact of volcanic eruptions: the sensitivity to eruption season and latitude in MPI-ESM ensemble experiments
Contributions of equatorial waves and small-scale convective gravity waves to the 2019/20 quasi-biennial oscillation (QBO) disruption
Differences in the quasi-biennial oscillation response to stratospheric aerosol modification depending on injection strategy and species
The advective Brewer–Dobson circulation in the ERA5 reanalysis: climatology, variability, and trends
Is our dynamical understanding of the circulation changes associated with the Antarctic ozone hole sensitive to the choice of reanalysis dataset?
The impact of increasing stratospheric radiative damping on the quasi-biennial oscillation period
Analysis of recent lower-stratospheric ozone trends in chemistry climate models
Kimberlee Dubé, Susann Tegtmeier, Felix Ploeger, and Kaley A. Walker
Atmos. Chem. Phys., 25, 1433–1447, https://doi.org/10.5194/acp-25-1433-2025, https://doi.org/10.5194/acp-25-1433-2025, 2025
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The transport rate of air in the stratosphere has changed in response to human emissions of greenhouse gases and ozone-depleting substances. This transport rate can be approximated using measurements of long-lived trace gases. We use observations and model results to derive anomalies and trends in the mean rate of stratospheric air transport. We find that air in the Northern Hemisphere aged by up to 0.3 years per decade relative to air in the Southern Hemisphere over 2004–2017.
Xiaolu Yan, Paul Konopka, Felix Ploeger, and Aurélien Podglajen
Atmos. Chem. Phys., 25, 1289–1305, https://doi.org/10.5194/acp-25-1289-2025, https://doi.org/10.5194/acp-25-1289-2025, 2025
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Our study finds that the air mass fractions (AMFs) from the Asian boundary layer (ABL) to the polar regions are about 1.5 times larger than those from the same latitude band in the Southern Hemisphere. The transport of AMFs from the ABL to the polar vortex primarily occurs above 20 km and over timescales exceeding 2 years. Our analysis reveals a strong correlation between the polar pollutants and the AMFs from the ABL. About 20 % of SF6 in the polar stratosphere originates from the ABL.
Eric A. Ray, Fred L. Moore, Hella Garny, Eric J. Hintsa, Bradley D. Hall, Geoff S. Dutton, David Nance, James W. Elkins, Steven C. Wofsy, Jasna Pittman, Bruce Daube, Bianca C. Baier, Jianghanyang Li, and Colm Sweeney
Atmos. Chem. Phys., 24, 12425–12445, https://doi.org/10.5194/acp-24-12425-2024, https://doi.org/10.5194/acp-24-12425-2024, 2024
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In this study we describe new techniques to derive age of air from multiple simultaneous measurements of long-lived trace gases in order to improve the fidelity of the age-of-air estimates and to be able to compare age of air from measurements taken from different instruments, platforms and decades. This technique also allows new transport information to be obtained from the measurements such as the primary source latitude that can also be compared to models.
Rachel W.-Y. Wu, Gabriel Chiodo, Inna Polichtchouk, and Daniela I. V. Domeisen
Atmos. Chem. Phys., 24, 12259–12275, https://doi.org/10.5194/acp-24-12259-2024, https://doi.org/10.5194/acp-24-12259-2024, 2024
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Strong variations in the strength of the stratospheric polar vortex can profoundly affect surface weather extremes; therefore, accurately predicting the stratosphere can improve surface weather forecasts. The research reveals how uncertainty in the stratosphere is linked to the troposphere. The findings suggest that refining models to better represent the identified sources and impact regions in the troposphere is likely to improve the prediction of the stratosphere and its surface impacts.
Zhe Wang, Jiankai Zhang, and Siyi Zhao
EGUsphere, https://doi.org/10.5194/egusphere-2024-2669, https://doi.org/10.5194/egusphere-2024-2669, 2024
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Mid-latitude wind in upper stratosphere is indispensable in establishing quasi-biennial oscillation (QBO)-vortex coupling in Southern hemisphere. During the Westerly QBO, positive zonal wind anomalies at 20° S−40° S in upper stratosphere in July, named as positive extratropical mode, lead to a stronger polar vortex in November, with a correlation reaching 0.75. This suggests that Antarctic stratospheric polar vortex and ozone concentration in spring can be predicted up to five months in advance.
Florian Voet, Felix Plöger, Johannes Laube, Peter Preusse, Paul Konopka, Jens-Uwe Grooß, Jörn Ungermann, Björn-Martin Sinnhuber, Michael Hoepfner, Bernd Funke, Gerald Wetzel, Sören Johansson, Gabriele Stiller, Eric Ray, and Michaela Imelda Hegglin
EGUsphere, https://doi.org/10.5194/egusphere-2024-2624, https://doi.org/10.5194/egusphere-2024-2624, 2024
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This study refines estimates of the stratospheric “age of air,” a measure of how long air circulates in the stratosphere. By analyzing correlations between trace gases measurable by satellites, the research introduces a method that reduces uncertainties and detects small-scale atmospheric features. This improved understanding of stratospheric circulation is crucial for better climate models and predictions, enhancing our ability to assess the impacts of climate change on the atmosphere.
Yang Li, Wuhu Feng, Xin Zhou, Yajuan Li, and Martyn P. Chipperfield
Atmos. Chem. Phys., 24, 8277–8293, https://doi.org/10.5194/acp-24-8277-2024, https://doi.org/10.5194/acp-24-8277-2024, 2024
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The Tibetan Plateau (TP), the highest and largest plateau, experiences strong surface solar UV radiation, whose excess can cause harmful influences on local biota. Hence, it is critical to study TP ozone. We find ENSO, the strongest interannual phenomenon, tends to induce tropospheric temperature change and thus modulate tropopause variability, which in turn favours ozone change over the TP. Our results have implications for a better understanding of the interannual variability of TP ozone.
Luis F. Millán, Peter Hoor, Michaela I. Hegglin, Gloria L. Manney, Harald Boenisch, Paul Jeffery, Daniel Kunkel, Irina Petropavlovskikh, Hao Ye, Thierry Leblanc, and Kaley Walker
Atmos. Chem. Phys., 24, 7927–7959, https://doi.org/10.5194/acp-24-7927-2024, https://doi.org/10.5194/acp-24-7927-2024, 2024
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In the Observed Composition Trends And Variability in the UTLS (OCTAV-UTLS) Stratosphere-troposphere Processes And their Role in Climate (SPARC) activity, we have mapped multiplatform ozone datasets into coordinate systems to systematically evaluate the influence of these coordinates on binned climatological variability. This effort unifies the work of studies that focused on individual coordinate system variability. Our goal was to create the most comprehensive assessment of this topic.
Masatomo Fujiwara, Patrick Martineau, Jonathon S. Wright, Marta Abalos, Petr Šácha, Yoshio Kawatani, Sean M. Davis, Thomas Birner, and Beatriz M. Monge-Sanz
Atmos. Chem. Phys., 24, 7873–7898, https://doi.org/10.5194/acp-24-7873-2024, https://doi.org/10.5194/acp-24-7873-2024, 2024
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A climatology of the major variables and terms of the transformed Eulerian-mean (TEM) momentum and thermodynamic equations from four global atmospheric reanalyses is evaluated. The spread among reanalysis TEM momentum balance terms is around 10 % in Northern Hemisphere winter and up to 50 % in Southern Hemisphere winter. The largest uncertainties in the thermodynamic equation (about 50 %) are in the vertical advection, which does not show a structure consistent with the differences in heating.
Gordana Jovanovic
EGUsphere, https://doi.org/10.5194/egusphere-2024-1856, https://doi.org/10.5194/egusphere-2024-1856, 2024
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Sudden stratospheric warming (SSW) is a phenomenon when the temperature in the stratosphere rises by about 50 K in just a few days. SSWs are caused by the breaking of atmospheric waves that propagate from the troposphere via the stratosphere to the mesosphere. SSWs impact the tropospheric circulation and the climate and and can lead to a dramatic decrease in temperature. During SSW events, the filtration of gravity waves has a major impact on mesospheric cooling.
Cristina Peña-Ortiz, Nuria Pilar Plaza, David Gallego, and Felix Ploeger
Atmos. Chem. Phys., 24, 5457–5478, https://doi.org/10.5194/acp-24-5457-2024, https://doi.org/10.5194/acp-24-5457-2024, 2024
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Although water vapour (H2O) in the lower stratosphere is only a few molecules among 1 million air molecules, atmospheric radiative forcing and surface temperature are sensitive to changes in its concentration. Monsoon regions play a key role in H2O transport and its concentration in the lower stratosphere. We show how the quasi-biennial oscillation (QBO) has a major impact on H2O over the Asian monsoon during August through changes in temperature caused by QBO modulation of tropical clouds.
Young-Ha Kim, Georg Sebastian Voelker, Gergely Bölöni, Günther Zängl, and Ulrich Achatz
Atmos. Chem. Phys., 24, 3297–3308, https://doi.org/10.5194/acp-24-3297-2024, https://doi.org/10.5194/acp-24-3297-2024, 2024
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The quasi-biennial oscillation, which governs the tropical stratospheric circulation, is driven primarily by small-scale wave processes. We employ a novel method to realistically represent these wave processes in a global model, thereby revealing an aspect of the oscillation that has not been identified before. We find that the oblique propagation of waves, a process neglected by existing climate models, plays a pivotal role in the stratospheric circulation and its oscillation.
Ellis Remsberg
Atmos. Chem. Phys., 24, 1691–1697, https://doi.org/10.5194/acp-24-1691-2024, https://doi.org/10.5194/acp-24-1691-2024, 2024
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CH4 data from the Halogen Occultation Experiment show clear changes in the deep and shallow branches of the Brewer–Dobson circulation (BDC) from 1992 to 2005. CH4 decreased in the upper stratosphere in the early 1990s following the Pinatubo eruption. There was also meridional transport of CH4 from the tropics to mid-latitudes in both hemispheres in the late 1990s. CH4 trends in the shallow branch agree with the tropospheric CH4 trends from 1996 to 2005.
Tiehan Zhou, Kevin J. DallaSanta, Clara Orbe, David H. Rind, Jeffrey A. Jonas, Larissa Nazarenko, Gavin A. Schmidt, and Gary Russell
Atmos. Chem. Phys., 24, 509–532, https://doi.org/10.5194/acp-24-509-2024, https://doi.org/10.5194/acp-24-509-2024, 2024
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The El Niño–Southern Oscillation (ENSO) tends to speed up and slow down the phase speed of the Quasi-Biennial Oscillation (QBO) during El Niño and La Niña, respectively. The ENSO modulation of the QBO does not show up in the climate models with parameterized but temporally constant gravity wave sources. We show that the GISS E2.2 models can capture the observed ENSO modulation of the QBO period with a horizontal resolution of 2° by 2.5° and its gravity wave sources parameterized interactively.
Helen Weierbach, Allegra N. LeGrande, and Kostas Tsigaridis
Atmos. Chem. Phys., 23, 15491–15505, https://doi.org/10.5194/acp-23-15491-2023, https://doi.org/10.5194/acp-23-15491-2023, 2023
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Volcanic aerosols impact global and regional climate conditions but can vary depending on pre-existing initial climate conditions. We ran an ensemble of volcanic aerosol simulations under varying ENSO and NAO initial conditions to understand how initial climate states impact the modeled response to volcanic forcing. Overall we found that initial NAO conditions can impact the strength of the first winter post-eruptive response but are also affected by the choice of anomaly and sampling routine.
Franziska Zilker, Timofei Sukhodolov, Gabriel Chiodo, Marina Friedel, Tatiana Egorova, Eugene Rozanov, Jan Sedlacek, Svenja Seeber, and Thomas Peter
Atmos. Chem. Phys., 23, 13387–13411, https://doi.org/10.5194/acp-23-13387-2023, https://doi.org/10.5194/acp-23-13387-2023, 2023
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The Montreal Protocol (MP) has successfully reduced the Antarctic ozone hole by banning chlorofluorocarbons (CFCs) that destroy the ozone layer. Moreover, CFCs are strong greenhouse gases (GHGs) that would have strengthened global warming. In this study, we investigate the surface weather and climate in a world without the MP at the end of the 21st century, disentangling ozone-mediated and GHG impacts of CFCs. Overall, we avoided 1.7 K global surface warming and a poleward shift in storm tracks.
Ji-Hee Yoo, Hye-Yeong Chun, and Min-Jee Kang
Atmos. Chem. Phys., 23, 10869–10881, https://doi.org/10.5194/acp-23-10869-2023, https://doi.org/10.5194/acp-23-10869-2023, 2023
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The January 2021 sudden stratospheric warming was preceded by unusual double westerly jets with polar stratospheric and subtropical mesospheric cores. This wind structure promotes anomalous dissipation of tropospheric planetary waves between the two maxima, leading to unusually strong shear instability. Shear instability generates the westward-propagating planetary waves with zonal wavenumber 2 in situ, thereby splitting the polar vortex just before the onset.
Frederik Harzer, Hella Garny, Felix Ploeger, Harald Bönisch, Peter Hoor, and Thomas Birner
Atmos. Chem. Phys., 23, 10661–10675, https://doi.org/10.5194/acp-23-10661-2023, https://doi.org/10.5194/acp-23-10661-2023, 2023
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We study the statistical relation between year-by-year fluctuations in winter-mean ozone and the strength of the stratospheric polar vortex. In the latitude–pressure plane, regression analysis shows that anomalously weak polar vortex years are associated with three pronounced local ozone maxima over the polar cap relative to the winter climatology. These response maxima primarily reflect the non-trivial combination of different ozone transport processes with varying relative contributions.
Sebastian Rhode, Peter Preusse, Manfred Ern, Jörn Ungermann, Lukas Krasauskas, Julio Bacmeister, and Martin Riese
Atmos. Chem. Phys., 23, 7901–7934, https://doi.org/10.5194/acp-23-7901-2023, https://doi.org/10.5194/acp-23-7901-2023, 2023
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Gravity waves (GWs) transport energy vertically and horizontally within the atmosphere and thereby affect wind speeds far from their sources. Here, we present a model that identifies orographic GW sources and predicts the pathways of the excited GWs through the atmosphere for a better understanding of horizontal GW propagation. We use this model to explain physical patterns in satellite observations (e.g., low GW activity above the Himalaya) and predict seasonal patterns of GW propagation.
Stephen Bourguet and Marianna Linz
Atmos. Chem. Phys., 23, 7447–7460, https://doi.org/10.5194/acp-23-7447-2023, https://doi.org/10.5194/acp-23-7447-2023, 2023
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Here, we show how projected changes to tropical circulation will impact the water vapor concentration in the lower stratosphere, which has implications for surface climate and stratospheric chemistry. In our transport scenarios with slower east–west winds, air parcels ascending into the stratosphere do not experience the same cold temperatures that they would today. This effect could act in concert with previously modeled changes to stratospheric water vapor to amplify surface warming.
Flossie Brown, Lauren Marshall, Peter H. Haynes, Rolando R. Garcia, Thomas Birner, and Anja Schmidt
Atmos. Chem. Phys., 23, 5335–5353, https://doi.org/10.5194/acp-23-5335-2023, https://doi.org/10.5194/acp-23-5335-2023, 2023
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Large-magnitude volcanic eruptions have the potential to alter large-scale circulation patterns, such as the quasi-biennial oscillation (QBO). The QBO is an oscillation of the tropical stratospheric zonal winds between easterly and westerly directions. Using a climate model, we show that large-magnitude eruptions can delay the progression of the QBO, with a much longer delay when the shear is easterly than when it is westerly. Such delays may affect weather and transport of atmospheric gases.
Dillon Elsbury, Amy H. Butler, John R. Albers, Melissa L. Breeden, and Andrew O'Neil Langford
Atmos. Chem. Phys., 23, 5101–5117, https://doi.org/10.5194/acp-23-5101-2023, https://doi.org/10.5194/acp-23-5101-2023, 2023
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One of the global hotspots where stratosphere-to-troposphere transport (STT) of ozone takes place is over Pacific North America (PNA). However, we do not know how or if STT over PNA will change in response to climate change. Using climate model experiments forced with
worst-casescenario Representative Concentration Pathway 8.5 climate change, we find that changes in net chemical production and transport of ozone in the lower stratosphere increase STT of ozone over PNA in the future.
Khalil Karami, Rolando Garcia, Christoph Jacobi, Jadwiga H. Richter, and Simone Tilmes
Atmos. Chem. Phys., 23, 3799–3818, https://doi.org/10.5194/acp-23-3799-2023, https://doi.org/10.5194/acp-23-3799-2023, 2023
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Alongside mitigation and adaptation efforts, stratospheric aerosol intervention (SAI) is increasingly considered a third pillar to combat dangerous climate change. We investigate the teleconnection between the quasi-biennial oscillation in the equatorial stratosphere and the Arctic stratospheric polar vortex under a warmer climate and an SAI scenario. We show that the Holton–Tan relationship weakens under both scenarios and discuss the physical mechanisms responsible for such changes.
Dirk Offermann, Christoph Kalicinsky, Ralf Koppmann, and Johannes Wintel
Atmos. Chem. Phys., 23, 3267–3278, https://doi.org/10.5194/acp-23-3267-2023, https://doi.org/10.5194/acp-23-3267-2023, 2023
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Atmospheric oscillations with periods between 5 and more than 200 years are believed to be self-excited (internal) in the atmosphere, i.e. non-anthropogenic. They are found at all altitudes up to 110 km and at four very different geographical locations (75° N, 70° E; 75° N, 280° E; 50° N, 7° E; 50° S, 7° E). Therefore, they hint at a global-oscillation mode. Their amplitudes are on the order of present-day climate trends, and it is therefore difficult to disentangle them.
Samuel Benito-Barca, Natalia Calvo, and Marta Abalos
Atmos. Chem. Phys., 22, 15729–15745, https://doi.org/10.5194/acp-22-15729-2022, https://doi.org/10.5194/acp-22-15729-2022, 2022
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The impact of different El Niño flavors (eastern (EP) and central (CP) Pacific El Niño) and La Niña on the stratospheric ozone is studied in a state-of-the-art chemistry–climate model. Ozone reduces in the tropics and increases in the extratropics when an EP El Niño event occurs, the opposite of La Niña. However, CP El Niño has no impact on extratropical ozone. These ozone variations are driven by changes in the stratospheric transport circulation, with an important contribution of mixing.
Nora Bergner, Marina Friedel, Daniela I. V. Domeisen, Darryn Waugh, and Gabriel Chiodo
Atmos. Chem. Phys., 22, 13915–13934, https://doi.org/10.5194/acp-22-13915-2022, https://doi.org/10.5194/acp-22-13915-2022, 2022
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Polar vortex extremes, particularly situations with an unusually weak cyclonic circulation in the stratosphere, can influence the surface climate in the spring–summer time in the Southern Hemisphere. Using chemistry-climate models and observations, we evaluate the robustness of the surface impacts. While models capture the general surface response, they do not show the observed climate patterns in midlatitude regions, which we trace back to biases in the models' circulations.
Stephen Bourguet and Marianna Linz
Atmos. Chem. Phys., 22, 13325–13339, https://doi.org/10.5194/acp-22-13325-2022, https://doi.org/10.5194/acp-22-13325-2022, 2022
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Here, we tested the impact of spatial and temporal resolution on Lagrangian trajectory studies in a key region of interest for climate feedbacks and stratospheric chemistry. Our analysis shows that new higher-resolution input data provide an opportunity for a better understanding of physical processes that control how air moves from the troposphere to the stratosphere. Future studies of how these processes will change in a warming climate will benefit from these results.
John R. Albers, Amy H. Butler, Andrew O. Langford, Dillon Elsbury, and Melissa L. Breeden
Atmos. Chem. Phys., 22, 13035–13048, https://doi.org/10.5194/acp-22-13035-2022, https://doi.org/10.5194/acp-22-13035-2022, 2022
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Ozone transported from the stratosphere contributes to background ozone concentrations in the free troposphere and to surface ozone exceedance events that affect human health. The physical processes whereby the El Niño–Southern Oscillation (ENSO) modulates North American stratosphere-to-troposphere ozone transport during spring are documented, and the usefulness of ENSO for predicting ozone events that may cause exceedances in surface air quality standards are assessed.
Axel Gabriel
Atmos. Chem. Phys., 22, 10425–10441, https://doi.org/10.5194/acp-22-10425-2022, https://doi.org/10.5194/acp-22-10425-2022, 2022
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Recent measurements show some evidence that the amplitudes of atmospheric gravity waves (horizontal wavelengths of 100–2000 km), which propagate from the troposphere (0–10 km) to the stratosphere and mesosphere (10–100 km), increase more strongly with height during daytime than during nighttime. This study shows that ozone–temperature coupling in the upper stratosphere can principally produce such an amplification. The results will help to improve atmospheric circulation models.
Liubov Poshyvailo-Strube, Rolf Müller, Stephan Fueglistaler, Michaela I. Hegglin, Johannes C. Laube, C. Michael Volk, and Felix Ploeger
Atmos. Chem. Phys., 22, 9895–9914, https://doi.org/10.5194/acp-22-9895-2022, https://doi.org/10.5194/acp-22-9895-2022, 2022
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Brewer–Dobson circulation (BDC) controls the composition of the stratosphere, which in turn affects radiation and climate. As the BDC cannot be measured directly, it is necessary to infer its strength and trends indirectly. In this study, we test in the
model worlddifferent methods for estimating the mean age of air trends based on a combination of stratospheric water vapour and methane data. We also provide simple practical advice of a more reliable estimation of the mean age of air trends.
Ming Shangguan and Wuke Wang
Atmos. Chem. Phys., 22, 9499–9511, https://doi.org/10.5194/acp-22-9499-2022, https://doi.org/10.5194/acp-22-9499-2022, 2022
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Skilful predictions of weather and climate on subseasonal to seasonal scales are valuable for decision makers. Here we show the global spatiotemporal variation of the temperature SAO in the UTLS with GNSS RO and reanalysis data. The formation of the SAO is explained by an energy budget analysis. The results show that the SAO in the UTLS is partly modified by the SSTs according to model simulations. The results may provide an important source for seasonal predictions of the surface weather.
Mengdie Xie, John C. Moore, Liyun Zhao, Michael Wolovick, and Helene Muri
Atmos. Chem. Phys., 22, 4581–4597, https://doi.org/10.5194/acp-22-4581-2022, https://doi.org/10.5194/acp-22-4581-2022, 2022
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We use data from six Earth system models to estimate Atlantic meridional overturning circulation (AMOC) changes and its drivers under four different solar geoengineering methods. Solar dimming seems relatively more effective than marine cloud brightening or stratospheric aerosol injection at reversing greenhouse-gas-driven declines in AMOC. Geoengineering-induced AMOC amelioration is due to better maintenance of air–sea temperature differences and reduced loss of Arctic summer sea ice.
Kai Qie, Wuke Wang, Wenshou Tian, Rui Huang, Mian Xu, Tao Wang, and Yifeng Peng
Atmos. Chem. Phys., 22, 4393–4411, https://doi.org/10.5194/acp-22-4393-2022, https://doi.org/10.5194/acp-22-4393-2022, 2022
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We identify a significantly intensified upward motion over the tropical western Pacific (TWP) and an enhanced tropical upwelling in boreal winter during 1958–2017 due to the warming of global sea surface temperatures (SSTs). Our results suggest that more tropospheric trace gases over the TWP could be elevated to the lower stratosphere, which implies that the emission from the maritime continent plays a more important role in the stratospheric processes and the global climate.
Audrey Lecouffe, Sophie Godin-Beekmann, Andrea Pazmiño, and Alain Hauchecorne
Atmos. Chem. Phys., 22, 4187–4200, https://doi.org/10.5194/acp-22-4187-2022, https://doi.org/10.5194/acp-22-4187-2022, 2022
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This study uses a model developped at LATMOS (France) to analyze the behavior of the Antarctic polar vortex from 1979 to 2020 at 675 K, 550 K, and 475 K isentropic levels. We found that the vortex edge intensity is stronger during the September–October–November period, while its edge position is less extended during this period. The polar vortex is stronger and lasts longer during solar minimum years. Breakup dates of the polar vortex are linked to the ozone hole and maximum wind speed.
Jan Clemens, Felix Ploeger, Paul Konopka, Raphael Portmann, Michael Sprenger, and Heini Wernli
Atmos. Chem. Phys., 22, 3841–3860, https://doi.org/10.5194/acp-22-3841-2022, https://doi.org/10.5194/acp-22-3841-2022, 2022
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Highly polluted air flows from the surface to higher levels of the atmosphere during the Asian summer monsoon. At high levels, the air is trapped within eddies. Here, we study how air masses can leave the eddy within its cutoff, how they distribute, and how their chemical composition changes. We found evidence for transport from the eddy to higher latitudes over the North Pacific and even Alaska. During transport, trace gas concentrations within cutoffs changed gradually, showing steady mixing.
Adam A. Scaife, Mark P. Baldwin, Amy H. Butler, Andrew J. Charlton-Perez, Daniela I. V. Domeisen, Chaim I. Garfinkel, Steven C. Hardiman, Peter Haynes, Alexey Yu Karpechko, Eun-Pa Lim, Shunsuke Noguchi, Judith Perlwitz, Lorenzo Polvani, Jadwiga H. Richter, John Scinocca, Michael Sigmond, Theodore G. Shepherd, Seok-Woo Son, and David W. J. Thompson
Atmos. Chem. Phys., 22, 2601–2623, https://doi.org/10.5194/acp-22-2601-2022, https://doi.org/10.5194/acp-22-2601-2022, 2022
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Great progress has been made in computer modelling and simulation of the whole climate system, including the stratosphere. Since the late 20th century we also gained a much clearer understanding of how the stratosphere interacts with the lower atmosphere. The latest generation of numerical prediction systems now explicitly represents the stratosphere and its interaction with surface climate, and here we review its role in long-range predictions and projections from weeks to decades ahead.
Yihang Hu, Wenshou Tian, Jiankai Zhang, Tao Wang, and Mian Xu
Atmos. Chem. Phys., 22, 1575–1600, https://doi.org/10.5194/acp-22-1575-2022, https://doi.org/10.5194/acp-22-1575-2022, 2022
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Antarctic stratospheric wave activities in September have been weakening significantly since the 2000s. Further analysis supports the finding that sea surface temperature (SST) trends over 20° N–70° S lead to the weakening of stratospheric wave activities, while the response of stratospheric wave activities to ozone recovery is weak. Thus, the SST trend should be taken into consideration when exploring the mechanism for the climate transition in the southern hemispheric stratosphere around 2000.
Sheena Loeffel, Roland Eichinger, Hella Garny, Thomas Reddmann, Frauke Fritsch, Stefan Versick, Gabriele Stiller, and Florian Haenel
Atmos. Chem. Phys., 22, 1175–1193, https://doi.org/10.5194/acp-22-1175-2022, https://doi.org/10.5194/acp-22-1175-2022, 2022
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SF6-derived trends of stratospheric AoA from observations and model simulations disagree in sign. SF6 experiences chemical degradation, which we explicitly integrate in a global climate model. In our simulations, the AoA trend changes sign when SF6 sinks are considered; thus, the process has the potential to reconcile simulated with observed AoA trends. We show that the positive AoA trend is due to the SF6 sinks themselves and provide a first approach for a correction to account for SF6 loss.
Nicholas A. Davis, Patrick Callaghan, Isla R. Simpson, and Simone Tilmes
Atmos. Chem. Phys., 22, 197–214, https://doi.org/10.5194/acp-22-197-2022, https://doi.org/10.5194/acp-22-197-2022, 2022
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Specified dynamics schemes attempt to constrain the atmospheric circulation in a climate model to isolate the role of transport in chemical variability, evaluate model physics, and interpret field campaign observations. We show that the specified dynamics scheme in CESM2 erroneously suppresses convection and induces circulation errors that project onto errors in tracers, even using the most optimal settings. Development of a more sophisticated scheme is necessary for future progress.
Cornelia Strube, Peter Preusse, Manfred Ern, and Martin Riese
Atmos. Chem. Phys., 21, 18641–18668, https://doi.org/10.5194/acp-21-18641-2021, https://doi.org/10.5194/acp-21-18641-2021, 2021
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High gravity wave (GW) momentum fluxes in the lower stratospheric southern polar vortex around 60° S are still poorly understood. Few GW sources are found at these latitudes. We present a ray tracing case study on waves resolved in high-resolution global model temperatures southeast of New Zealand. We show that lateral propagation of more than 1000 km takes place below 20 km altitude, and a variety of orographic and non-orographic sources located north of 50° S generate the wave field.
Erika Brattich, Hongyu Liu, Bo Zhang, Miguel Ángel Hernández-Ceballos, Jussi Paatero, Darko Sarvan, Vladimir Djurdjevic, Laura Tositti, and Jelena Ajtić
Atmos. Chem. Phys., 21, 17927–17951, https://doi.org/10.5194/acp-21-17927-2021, https://doi.org/10.5194/acp-21-17927-2021, 2021
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In this study we analyse the output of a chemistry and transport model together with observations of different meteorological and compositional variables to demonstrate the link between sudden stratospheric warming and transport of stratospheric air to the surface in the subpolar regions of Europe during the cold season. Our findings have particular implications for atmospheric composition since climate projections indicate more frequent sudden stratospheric warming under a warmer climate.
Liang Tang, Sheng-Yang Gu, and Xian-Kang Dou
Atmos. Chem. Phys., 21, 17495–17512, https://doi.org/10.5194/acp-21-17495-2021, https://doi.org/10.5194/acp-21-17495-2021, 2021
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Our study explores the variation in the occurrence date, peak amplitude and wave period for eastward waves and the role of instability, background wind structure and the critical layer in eastward wave propagation and amplification.
Marta Abalos, Natalia Calvo, Samuel Benito-Barca, Hella Garny, Steven C. Hardiman, Pu Lin, Martin B. Andrews, Neal Butchart, Rolando Garcia, Clara Orbe, David Saint-Martin, Shingo Watanabe, and Kohei Yoshida
Atmos. Chem. Phys., 21, 13571–13591, https://doi.org/10.5194/acp-21-13571-2021, https://doi.org/10.5194/acp-21-13571-2021, 2021
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The stratospheric Brewer–Dobson circulation (BDC), responsible for transporting mass, tracers and heat globally in the stratosphere, is evaluated in a set of state-of-the-art climate models. The acceleration of the BDC in response to increasing greenhouse gases is most robust in the lower stratosphere. At higher levels, the well-known inconsistency between model and observational BDC trends can be partly reconciled by accounting for limited sampling and large uncertainties in the observations.
Zhihong Zhuo, Ingo Kirchner, Stephan Pfahl, and Ulrich Cubasch
Atmos. Chem. Phys., 21, 13425–13442, https://doi.org/10.5194/acp-21-13425-2021, https://doi.org/10.5194/acp-21-13425-2021, 2021
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The impact of volcanic eruptions varies with eruption season and latitude. This study simulated eruptions at different latitudes and in different seasons with a fully coupled climate model. The climate impacts of northern and southern hemispheric eruptions are reversed but are insensitive to eruption season. Results suggest that the regional climate impacts are due to the dynamical response of the climate system to radiative effects of volcanic aerosols and the subsequent regional feedbacks.
Min-Jee Kang and Hye-Yeong Chun
Atmos. Chem. Phys., 21, 9839–9857, https://doi.org/10.5194/acp-21-9839-2021, https://doi.org/10.5194/acp-21-9839-2021, 2021
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In winter 2019/20, the westerly quasi-biennial oscillation (QBO) phase was disrupted again by easterly winds. It is found that strong Rossby waves from the Southern Hemisphere weaken the jet core in early stages, and strong mixed Rossby–gravity waves reverse the wind in later stages. Inertia–gravity waves and small-scale convective gravity waves also provide negative forcing. These strong waves are attributed to an anomalous wind profile, barotropic instability, and slightly strong convection.
Henning Franke, Ulrike Niemeier, and Daniele Visioni
Atmos. Chem. Phys., 21, 8615–8635, https://doi.org/10.5194/acp-21-8615-2021, https://doi.org/10.5194/acp-21-8615-2021, 2021
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Stratospheric aerosol modification (SAM) can alter the quasi-biennial oscillation (QBO). Our simulations with two different models show that the characteristics of the QBO response are primarily determined by the meridional structure of the aerosol-induced heating. Therefore, the QBO response to SAM depends primarily on the location of injection, while injection type and rate act to scale the specific response. Our results have important implications for evaluating adverse side effects of SAM.
Mohamadou Diallo, Manfred Ern, and Felix Ploeger
Atmos. Chem. Phys., 21, 7515–7544, https://doi.org/10.5194/acp-21-7515-2021, https://doi.org/10.5194/acp-21-7515-2021, 2021
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Despite good agreement in the spatial structure, there are substantial differences in the strength of the Brewer–Dobson circulation (BDC) and its modulations in the UTLS and upper stratosphere. The tropical upwelling is generally weaker in ERA5 than in ERAI due to weaker planetary and gravity wave breaking in the UTLS. Analysis of the BDC trend shows an acceleration of the BDC of about 1.5 % decade-1 due to the long-term intensification in wave breaking, consistent with climate predictions.
Andrew Orr, Hua Lu, Patrick Martineau, Edwin P. Gerber, Gareth J. Marshall, and Thomas J. Bracegirdle
Atmos. Chem. Phys., 21, 7451–7472, https://doi.org/10.5194/acp-21-7451-2021, https://doi.org/10.5194/acp-21-7451-2021, 2021
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Reanalysis datasets combine observations and weather forecast simulations to create our best estimate of the state of the atmosphere and are important for climate monitoring. Differences in the technical details of these products mean that they may give different results. This study therefore examined how changes associated with the so-called Antarctic ozone hole are represented, which is one of the most important climate changes in recent decades, and showed that they were broadly consistent.
Tiehan Zhou, Kevin DallaSanta, Larissa Nazarenko, Gavin A. Schmidt, and Zhonghai Jin
Atmos. Chem. Phys., 21, 7395–7407, https://doi.org/10.5194/acp-21-7395-2021, https://doi.org/10.5194/acp-21-7395-2021, 2021
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Stratospheric radiative damping increases with rising CO2. Sensitivity experiments using the one-dimensional mechanistic models of the quasi-biennial oscillation (QBO) indicate a shortening of the simulated QBO period due to the enhancing of the radiative damping. This result suggests that increasing radiative damping may play a role in determining the QBO period in a warming climate along with wave momentum flux entering the stratosphere and tropical vertical residual velocity.
Simone Dietmüller, Hella Garny, Roland Eichinger, and William T. Ball
Atmos. Chem. Phys., 21, 6811–6837, https://doi.org/10.5194/acp-21-6811-2021, https://doi.org/10.5194/acp-21-6811-2021, 2021
Cited articles
Alley, R. B.: Wally Was Right: Predictive Ability of the North
Atlantic “Conveyor Belt” Hypothesis for Abrupt Climate
Change, Annu. Rev. Earth Pl. Sc., 35, 241–272,
https://doi.org/10.1146/annurev.earth.35.081006.131524, 2007. a
Andrews, M. B., Knight, J. R., Scaife, A. A., Lu, Y., Wu, T., Gray, L. J., and
Schenzinger, V.: Observed and Simulated Teleconnections Between the
Stratospheric Quasi-Biennial Oscillation and Northern Hemisphere
Winter Atmospheric Circulation, J. Geophys. Res.-Atmos., 124, 1219–1232, https://doi.org/10.1029/2018JD029368, 2019. a
Ayarzagüena, B., Palmeiro, F. M., Barriopedro, D., Calvo, N., Langematz, U., and Shibata, K.: On the representation of major stratospheric warmings in reanalyses, Atmos. Chem. Phys., 19, 9469–9484, https://doi.org/10.5194/acp-19-9469-2019, 2019. a
Ayarzagüena, B., Charlton-Perez, A., Butler, A., Hitchcock, P., Simpson,
I., Polvani, L., Butchart, N., Gerber, E., Gray, L., Hassler, B., Lin, P.,
Lott, F., Manzini, E., Mizuta, R., Orbe, C., Osprey, S., Saint-Martin, D.,
Sigmond, M., Taguchi, M., and Watanabe, S.: Uncertainty in the Response
of Sudden Stratospheric Warmings and Stratosphere-Troposphere
Coupling to Quadrupled CO2 Concentrations in CMIP6 Models,
J. Geophys. Res.-Atmos., 125, 103–121,
https://doi.org/10.1029/2019JD032345, 2020. a
Bakker, P., Schmittner, A., Lenaerts, J. T. M., Abe-Ouchi, A., Bi, D.,
van den Broeke, M. R., Chan, W.-L., Hu, A., Beadling, R. L., Marsland, S. J.,
Mernild, S. H., Saenko, O. A., Swingedouw, D., Sullivan, A., and Yin, J.:
Fate of the Atlantic Meridional Overturning Circulation: Strong
Decline under Continued Warming and Greenland Melting, Geophys. Res. Lett., 43, 12252–12260, https://doi.org/10.1002/2016GL070457, 2016. a
Baldwin, M. P. and Thompson, D. W.: A Critical Comparison of
Stratosphere-Troposphere Coupling Indices, Quarterly J. Roy. Meteor. Soc., 135, 1661–1672, https://doi.org/10.1002/qj.479,
2009. a
Baldwin, M. P., Ayarzagüena, B., Birner, T., Butchart, N., Butler, A. H.,
Charlton-Perez, A. J., Domeisen, D. I. V., Garfinkel, C. I., Garny, H.,
Gerber, E. P., Hegglin, M. I., Langematz, U., and Pedatella, N. M.: Sudden
Stratospheric Warmings, Rev. Geophys., 59, e2020RG000708,
https://doi.org/10.1029/2020RG000708, 2021. a
Bancalá, S., Krüger, K., and Giorgetta, M.: The Preconditioning of
Major Sudden Stratospheric Warmings, J. Geophys. Res. -Atmos., 117, 4101, https://doi.org/10.1029/2011JD016769, 2012. a
Biastoch, A., Böning, C. W., Getzlaff, J., Molines, J.-M., and Madec, G.:
Causes of Interannual-Decadal Variability in the
Meridional Overturning Circulation of the Midlatitude North Atlantic
Ocean, J. Climate, 21, 6599–6615, https://doi.org/10.1175/2008JCLI2404.1,
2008. a, b
Böning, C. W., Scheinert, M., Dengg, J., Biastoch, A., and Funk, A.:
Decadal Variability of Subpolar Gyre Transport and Its Reverberation in the
North Atlantic Overturning, Geophys. Res. Lett., 33,
https://doi.org/10.1029/2006GL026906, 2006.
a
Buckley, M. W. and Marshall, J.: Observations, Inferences, and Mechanisms of
the Atlantic Meridional Overturning Circulation: A Review, Rev. Geophys., 54, 5–63, https://doi.org/10.1002/2015RG000493, 2016. a
Caesar, L., Rahmstorf, S., Robinson, A., Feulner, G., and Saba, V.: Observed
Fingerprint of a Weakening Atlantic Ocean Overturning Circulation,
Nature, 556, 191–196, https://doi.org/10.1038/s41586-018-0006-5, 2018. a
Caesar, L., McCarthy, G. D., Thornalley, D. J. R., Cahill, N., and Rahmstorf,
S.: Current Atlantic Meridional Overturning Circulation Weakest in Last
Millennium, Nat. Geosci., 14, 118–120,
https://doi.org/10.1038/s41561-021-00699-z, 2021. a
Cessi, P., Bryan, K., and Zhang, R.: Global Seiching of Thermocline Waters
between the Atlantic and the Indian-Pacific Ocean Basins,
Geophys. Res. Lett., 31, https://doi.org/10.1029/2003GL019091, 2004. a
Charlton, A. J. and Polvani, L. M.: A New Look at Stratospheric Sudden
Warmings. Part I: Climatology and Modeling Benchmarks, J. Climate, 20, 449–469, https://doi.org/10.1175/JCLI3996.1, 2007. a
Charlton-Perez, A. J., Ferranti, L., and Lee, R. W.: The Influence of the
Stratospheric State on North Atlantic Weather Regimes, Q. J. Roy. Meteor. Soc., 144, 1140–1151, https://doi.org/10.1002/qj.3280,
2018. a, b
Cheng, H., Edwards, R. L., Broecker, W. S., Denton, G. H., Kong, X., Wang, Y.,
Zhang, R., and Wang, X.: Ice Age Terminations, Science, 326, 248–252,
https://doi.org/10.1126/science.1177840, 2009. a
Cohen, J., Barlow, M., and Saito, K.: Decadal Fluctuations in Planetary
Wave Forcing Modulate Global Warming in Late Boreal Winter, J. Climate, 22, 4418–4426, https://doi.org/10.1175/2009JCLI2931.1, 2009. a
Copernicus Climate Change Service Climate Data Store (CDS): Climate reanalysis, CDS [data set], https://climate.copernicus.eu/climate-reanalysis (last access: 10 August 2021), 2022. a
Davini, P., Cagnazzo, C., and Anstey, J. A.: A Blocking View of the
Stratosphere-Troposphere Coupling, J. Geophys. Res.-Atmos., 119, 11100–11115, https://doi.org/10.1002/2014JD021703, 2014. a
Delworth, T., Manabe, S., and Stouffer, R. J.: Interdecadal Variations of
the Thermohaline Circulation in a Coupled Ocean-Atmosphere Model,
J. Climate, 6, 1993–2011,
https://doi.org/10.1175/1520-0442(1993)006<1993:IVOTTC>2.0.CO;2, 1993. a, b, c
Delworth, T. L. and Dixon, K. W.: Implications of the Recent Trend in the
Arctic/North Atlantic Oscillation for the North Atlantic
Thermohaline Circulation, J. Climate, 13, 3721–3727,
https://doi.org/10.1175/1520-0442(2000)013<3721:IOTRTI>2.0.CO;2, 2000. a
Delworth, T. L. and Greatbatch, R. J.: Multidecadal Thermohaline Circulation
Variability Driven by Atmospheric Surface Flux Forcing, J. Climate, 13, 1481–1495,
https://doi.org/10.1175/1520-0442(2000)013<1481:MTCVDB>2.0.CO;2, 2000. a
Delworth, T. L. and Mann, M. E.: Observed and Simulated Multidecadal
Variability in the Northern Hemisphere, Clim. Dynam., 16, 661–676,
https://doi.org/10.1007/s003820000075, 2000. a
Delworth, T. L. and Zeng, F.: The Impact of the North Atlantic
Oscillation on Climate through Its Influence on the Atlantic
Meridional Overturning Circulation, J. Climate, 29, 941–962,
https://doi.org/10.1175/JCLI-D-15-0396.1, 2016. a, b
Dimdore-Miles, O.: oscardm20994/Wavelet_analysis: Wavlet_analysis (1.0), Zenodo [code], https://doi.org/10.5281/zenodo.4529635, 2021. a
Domeisen, D. I. V.: Estimating the Frequency of Sudden Stratospheric
Warming Events From Surface Observations of the North Atlantic
Oscillation, J. Geophys. Res.-Atmos., 124, 3180–3194,
https://doi.org/10.1029/2018JD030077, 2019. a, b
Domeisen, D. I. V., Garfinkel, C. I., and Butler, A. H.: The Teleconnection
of El Niño Southern Oscillation to the Stratosphere, Rev. Geophys., 57, 5–47, https://doi.org/10.1029/2018RG000596, 2019. a
Domeisen, D. I. V., Butler, A. H., Charlton-Perez, A. J., Ayarzagüena, B.,
Baldwin, M. P., Dunn-Sigouin, E., Furtado, J. C., Garfinkel, C. I.,
Hitchcock, P., Karpechko, A. Y., Kim, H., Knight, J., Lang, A. L., Lim,
E.-P., Marshall, A., Roff, G., Schwartz, C., Simpson, I. R., Son, S.-W., and
Taguchi, M.: The Role of the Stratosphere in Subseasonal to
Seasonal Prediction: 1. Predictability of the Stratosphere,
J. Geophys. Res.-Atmos., 125, e2019JD030 920,
https://doi.org/10.1029/2019JD030920, 2020a. a
Domeisen, D. I. V., Butler, A. H., Charlton-Perez, A. J., Ayarzagüena, B.,
Baldwin, M. P., Dunn-Sigouin, E., Furtado, J. C., Garfinkel, C. I.,
Hitchcock, P., Karpechko, A. Y., Kim, H., Knight, J., Lang, A. L., Lim,
E.-P., Marshall, A., Roff, G., Schwartz, C., Simpson, I. R., Son, S.-W., and
Taguchi, M.: The Role of the Stratosphere in Subseasonal to
Seasonal Prediction: 2. Predictability Arising From
Stratosphere-Troposphere Coupling, J. Geophys. Res.-Atmos., 125, e2019JD030 923, https://doi.org/10.1029/2019JD030923,
2020b. a
Earth System Grid Federation of the Centre for Environmental Data Analysis: WCRP Coupled Model Intercomparison Project (Phase 6), ESGF [data set], https://esgf-index1.ceda.ac.uk/projects/cmip6-ceda/ (last access: 6 August 2021), 2019. a
Eden, C. and Jung, T.: North Atlantic Interdecadal Variability: Oceanic
Response to the North Atlantic Oscillation (1865–1997),
J. Climate, 14, 676–691,
https://doi.org/10.1175/1520-0442(2001)014<0676:NAIVOR>2.0.CO;2, 2001. a
Eden, C. and Willebrand, J.: Mechanism of Interannual to Decadal
Variability of the North Atlantic Circulation, J. Climate, 14,
2266–2280, https://doi.org/10.1175/1520-0442(2001)014<2266:MOITDV>2.0.CO;2, 2001. a, b
Frankignoul, C., Gastineau, G., and Kwon, Y.-O.: The Influence of the
AMOC Variability on the Atmosphere in CCSM3, J. Climate,
26, 9774–9790, https://doi.org/10.1175/JCLI-D-12-00862.1, 2013. a, b
Frierson, D. M. W., Hwang, Y.-T., Fučkar, N. S., Seager, R., Kang, S. M.,
Donohoe, A., Maroon, E. A., Liu, X., and Battisti, D. S.: Contribution of
Ocean Overturning Circulation to Tropical Rainfall Peak in the Northern
Hemisphere, Nat. Geosci., 6, 940–944, https://doi.org/10.1038/ngeo1987, 2013. a
Garfinkel, C. I., Hurwitz, M. M., and Oman, L. D.: Effect of Recent Sea Surface
Temperature Trends on the Arctic Stratospheric Vortex, J. Geophys. Res.-Atmos., 120, 5404–5416,
https://doi.org/10.1002/2015JD023284, 2015. a
Garfinkel, C. I., Son, S.-W., Song, K., Aquila, V., and Oman, L. D.:
Stratospheric Variability Contributed to and Sustained the Recent Hiatus in
Eurasian Winter Warming, Geophys. Res. Lett., 44, 374–382,
https://doi.org/10.1002/2016GL072035, 2017. a
Gerber, E. P., Polvani, L. M., and Ancukiewicz, D.: Annular Mode Time Scales in
the Intergovernmental Panel on Climate Change Fourth Assessment
Report Models, Geophys. Res. Lett., 35, L22707,
https://doi.org/10.1029/2008GL035712, 2008a. a
Gerber, E. P., Voronin, S., and Polvani, L. M.: Testing the Annular Mode
Autocorrelation Time Scale in Simple Atmospheric General Circulation
Models, Mon. Weather Rev., 136, 1523–1536,
https://doi.org/10.1175/2007MWR2211.1, 2008b. a
Gerber, E. P., Orbe, C., and Polvani, L. M.: Stratospheric Influence on the
Tropospheric Circulation Revealed by Idealized Ensemble Forecasts,
Geophys. Res. Lett., 36, L24801, https://doi.org/10.1029/2009GL040913, 2009. a
Grinsted, A., Moore, J. C., and Jevrejeva, S.: Application of the Cross Wavelet
Transform and Wavelet Coherence to Geophysical Time Series, Nonlinear Proc. Geoph., 11, 561–566, https://doi.org/10.5194/npg-11-561-2004, 2004. a
Haase, S., Matthes, K., Latif, M., and Omrani, N.-E.: The Importance of a
Properly Represented Stratosphere for Northern Hemisphere Surface
Variability in the Atmosphere and the Ocean, J. Climate,
31, 8481–8497, https://doi.org/10.1175/JCLI-D-17-0520.1, 2018. a
Halpert, M. S. and Bell, G. D.: Climate Assessment for 1996, B. Am. Meteorol. Soc., 78, S1–S50,
https://doi.org/10.1175/1520-0477-78.5s.S1, 1997. a
Hausmann, U., Czaja, A., and Marshall, J.: Mechanisms controlling the SST
air-sea heat flux feedback and its dependence on spatial scale, Clim. Dynam., 48, 1297–1307, https://doi.org/10.1007/s00382-016-3142-3, 2017. a
Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A.,
Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schepers, D.,
Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P.,
Biavati, G., Bidlot, J., Bonavita, M., Chiara, G. D., Dahlgren, P., Dee, D.,
Diamantakis, M., Dragani, R., Flemming, J., Forbes, R., Fuentes, M., Geer,
A., Haimberger, L., Healy, S., Hogan, R. J., Hólm, E., Janisková, M.,
Keeley, S., Laloyaux, P., Lopez, P., Lupu, C., Radnoti, G., de Rosnay, P.,
Rozum, I., Vamborg, F., Villaume, S., and Thépaut, J.-N.: The ERA5
Global Reanalysis, Q. J. Roy. Meteor. Soc.,
146, 1999–2049, https://doi.org/10.1002/qj.3803, 2020. a
Hitchcock, P. and Simpson, I. R.: The Downward Influence of Stratospheric
Sudden Warmings, J. Atmos. Sci., 71, 3856–3876,
https://doi.org/10.1175/JAS-D-14-0012.1, 2014. a
Hurrell, J., Kushnir, Y., Ottersen, G., and Visbeck, M.: The North Atlantic
Oscillation: Climatic Significance and Environmental Impact,
Geophys. Monogr. Ser., 134, https://doi.org/10.1029/GM134, 2003. a
Johnson, N. C.: How Many ENSO Flavors Can We Distinguish?, J. Climate, 26, 4816–4827, https://doi.org/10.1175/JCLI-D-12-00649.1, 2013. a
King, A. D., Butler, A. H., Jucker, M., Earl, N. O., and Rudeva, I.: Observed
Relationships Between Sudden Stratospheric Warmings and European
Climate Extremes, J. Geophys. Res.-Atmos., 124,
13 943–13 961, https://doi.org/10.1029/2019JD030480, 2019. a
Knight, J. R., Allan, R. J., Folland, C. K., Vellinga, M., and Mann, M. E.: A
Signature of Persistent Natural Thermohaline Circulation Cycles in Observed
Climate, Geophys. Res. Lett., 32, L20708, https://doi.org/10.1029/2005GL024233, 2005. a
Kolstad, E. W., Breiteig, T., and Scaife, A. A.: The Association between
Stratospheric Weak Polar Vortex Events and Cold Air Outbreaks in the
Northern Hemisphere, Q. J. Roy. Meteor. Soc., 136, 886–893, https://doi.org/10.1002/qj.620, 2010. a
Kuhlbrodt, T., Griesel, A., Montoya, M., Levermann, A., Hofmann, M., and
Rahmstorf, S.: On the Driving Processes of the Atlantic Meridional
Overturning Circulation, Rev. Geophys., 45, RG2001,
https://doi.org/10.1029/2004RG000166, 2007. a
Latif, M. and Keenlyside, N. S.: A Perspective on Decadal Climate Variability
and Predictability, Deep Sea Research Part II: Topical Studies in
Oceanography, 58, 1880–1894, https://doi.org/10.1016/j.dsr2.2010.10.066, 2011. a
Lau, K.-M. and Weng, H.: Climate Signal Detection Using Wavelet Transform:
How to Make a Time Series Sing, B. Am. Meteorol. Soc., 76, 2391–2402,
https://doi.org/10.1175/1520-0477(1995)076<2391:CSDUWT>2.0.CO;2, 1995. a
Lavoie, D., Lambert, N., and Gilbert, D.: Projections of Future Trends in
Biogeochemical Conditions in the Northwest Atlantic Using CMIP5 Earth
System Models, Atmos. Ocean, 57, 18–40,
https://doi.org/10.1080/07055900.2017.1401973, 2019. a
Lawrence, Z. D., Perlwitz, J., Butler, A. H., Manney, G. L., Newman, P. A.,
Lee, S. H., and Nash, E. R.: The Remarkably Strong Arctic Stratospheric
Polar Vortex of Winter 2020: Links to Record-Breaking Arctic
Oscillation and Ozone Loss, J. Geophys. Res.-Atmos., 125, e2020JD033 271, https://doi.org/10.1029/2020JD033271, 2020. a
Lehtonen, I. and Karpechko, A. Y.: Observed and Modeled Tropospheric Cold
Anomalies Associated with Sudden Stratospheric Warmings, J. Geophys. Res.-Atmos., 121, 1591–1610,
https://doi.org/10.1002/2015JD023860, 2016. a, b
Liu, W., Xie, S.-P., Liu, Z., and Zhu, J.: Overlooked Possibility of a
Collapsed Atlantic Meridional Overturning Circulation in Warming Climate,
Science Advances, 3, e1601666, https://doi.org/10.1126/sciadv.1601666, 2017. a
Liu, W., Fedorov, A., and Sévellec, F.: The Mechanisms of the
Atlantic Meridional Overturning Circulation Slowdown Induced by Arctic
Sea Ice Decline, J. Climate, 32, 977–996,
https://doi.org/10.1175/JCLI-D-18-0231.1, 2019. a
Liu, Y., Liang, X. S., and Weisberg, R. H.: Rectification of the Bias in
the Wavelet Power Spectrum, J. Atmos. Ocean. Techn., 24, 2093–2102, https://doi.org/10.1175/2007JTECHO511.1, 2007. a
Lohmann, K., Drange, H., and Bentsen, M.: Response of the North Atlantic
Subpolar Gyre to Persistent North Atlantic Oscillation like Forcing,
Clim. Dynam., 32, 273–285, https://doi.org/10.1007/s00382-008-0467-6, 2009. a
Lu, H., Baldwin, M. P., Gray, L. J., and Jarvis, M. J.: Decadal-Scale Changes
in the Effect of the QBO on the Northern Stratospheric Polar Vortex,
J. Geophys. Res.-Atmos., 113, D10114,
https://doi.org/10.1029/2007JD009647, 2008. a, b
Lu, H., Bracegirdle, T. J., Phillips, T., Bushell, A., and Gray, L.: Mechanisms
for the Holton-Tan Relationship and Its Decadal Variation, J. Geophys. Res.-Atmos., 119, 2811–2830,
https://doi.org/10.1002/2013JD021352, 2014. a, b
Manney, G. L., Krüger, K., Sabutis, J. L., Sena, S. A., and Pawson, S.: The
Remarkable 2003–2004 Winter and Other Recent Warm Winters in the
Arctic Stratosphere since the Late 1990s, J. Geophys. Res.-Atmos., 110, D04107, https://doi.org/10.1029/2004JD005367, 2005. a, b
Mantua, N. J., Hare, S. R., Zhang, Y., Wallace, J. M., and Francis, R. C.: A
Pacific Interdecadal Climate Oscillation with Impacts on Salmon
Production, B. Am. Meteorol. Soc., 78,
1069–1080, https://doi.org/10.1175/1520-0477(1997)078<1069:APICOW>2.0.CO;2, 1997. a
Manzini, E., Cagnazzo, C., Fogli, P. G., Bellucci, A., and Müller, W. A.:
Stratosphere-Troposphere Coupling at Inter-Decadal Time Scales:
Implications for the North Atlantic Ocean, Geophys. Res. Lett., 39, L05801, https://doi.org/10.1029/2011GL050771, 2012. a
Maycock, A. C., Masukwedza, G. I. T., Hitchcock, P., and Simpson, I. R.: A
Regime Perspective on the North Atlantic Eddy-Driven Jet Response
to Sudden Stratospheric Warmings, J. Climate, 33, 3901–3917,
https://doi.org/10.1175/JCLI-D-19-0702.1, 2020. a
McCarthy, G., Frajka-Williams, E., Johns, W. E., Baringer, M. O., Meinen,
C. S., Bryden, H. L., Rayner, D., Duchez, A., Roberts, C., and Cunningham,
S. A.: Observed Interannual Variability of the Atlantic Meridional
Overturning Circulation at 26.5∘ N, Geophys. Res. Lett., 39, L19609, https://doi.org/10.1029/2012GL052933, 2012. a
McCarthy, G. D., Smeed, D. A., Johns, W. E., Frajka-Williams, E., Moat,
B. I., Rayner, D., Baringer, M. O., Meinen, C. S., Collins, J., and Bryden,
H. L.: Measuring the Atlantic Meridional Overturning Circulation at
26∘ N, Prog. Oceanogr., 130, 91–111,
https://doi.org/10.1016/j.pocean.2014.10.006, 2015. a
Medhaug, I., Langehaug, H. R., Eldevik, T., Furevik, T., and Bentsen, M.:
Mechanisms for Decadal Scale Variability in a Simulated Atlantic
Meridional Overturning Circulation, Clim. Dynam., 39, 77–93,
https://doi.org/10.1007/s00382-011-1124-z, 2012. a, b
Menary, M. B., Park, W., Lohmann, K., Vellinga, M., Palmer, M. D., Latif, M.,
and Jungclaus, J. H.: A Multimodel Comparison of Centennial Atlantic
Meridional Overturning Circulation Variability, Clim. Dynam., 38,
2377–2388, https://doi.org/10.1007/s00382-011-1172-4, 2012. a
Menary, M. B., Kuhlbrodt, T., Ridley, J., Andrews, M. B., Dimdore-Miles,
O. B., Deshayes, J., Eade, R., Gray, L., Ineson, S., Mignot, J., Roberts,
C. D., Robson, J., Wood, R. A., and Xavier, P.: Preindustrial Control
Simulations With HadGEM3-GC3.1 for CMIP6, J. Adv. Model. Earth Sy., 10, 3049–3075, https://doi.org/10.1029/2018MS001495, 2018. a
Mielke, C., Frajka-Williams, E., and Baehr, J.: Observed and Simulated
Variability of the AMOC at 26∘ N and 41∘ N,
Geophys. Res. Lett., 40, 1159–1164, https://doi.org/10.1002/grl.50233, 2013. a
Moat, B. I., Frajka-Williams, E., Smeed, D., Rayner, D., Sanchez-Franks,
A., Johns, W. E., Baringer, M. O., Volkov, D. L., and Collins, J.: Atlantic
Meridional Overturning Circulation Observed by the
RAPID-MOCHA-WBTS (RAPID-Meridional Overturning
Circulation and Heatflux Array-Western Boundary Time Series) Array
at 26N from 2004 to 2018 (V2018.2)., British Oceonograpic Data Centre (BODC) [data set],
https://doi.org/10.5285/AA57E879-4CCA-28B6-E053-6C86ABC02DE5, 2020. a
Mulcahy, J. P., Jones, C., Sellar, A., Johnson, B., Boutle, I. A., Jones, A.,
Andrews, T., Rumbold, S. T., Mollard, J., Bellouin, N., Johnson, C. E.,
Williams, K. D., Grosvenor, D. P., and McCoy, D. T.: Improved Aerosol
Processes and Effective Radiative Forcing in HadGEM3 and
UKESM1, J. Adv. Model. Earth Sy., 10, 2786–2805,
https://doi.org/10.1029/2018MS001464, 2018. a
Pawson, S. and Naujokat, B.: The Cold Winters of the Middle 1990s in the
Northern Lower Stratosphere, J. Geophys. Res.-Atmos.,
104, 14209–14222, https://doi.org/10.1029/1999JD900211, 1999. a, b, c, d
Rao, J., Garfinkel, C. I., and Ren, R.: Modulation of the Northern Winter
Stratospheric El Niño–Southern Oscillation Teleconnection
by the PDO, J. Climate, 32, 5761–5783,
https://doi.org/10.1175/JCLI-D-19-0087.1, 2019. a
Ridley, J. K., Blockley, E. W., Keen, A. B., Rae, J. G. L., West, A. E., and Schroeder, D.: The sea ice model component of HadGEM3-GC3.1, Geosci. Model Dev., 11, 713–723, https://doi.org/10.5194/gmd-11-713-2018, 2018. a
Roberts, C. D., Jackson, L., and McNeall, D.: Is the 2004–2012
Reduction of the Atlantic Meridional Overturning Circulation
Significant?, Geophys. Res. Lett., 41, 3204–3210,
https://doi.org/10.1002/2014GL059473, 2014. a, b
Robson, J., Sutton, R., Lohmann, K., Smith, D., and Palmer, M. D.: Causes of
the Rapid Warming of the North Atlantic Ocean in the Mid-1990s,
J. Climate, 25, 4116–4134, https://doi.org/10.1175/JCLI-D-11-00443.1, 2012. a, b
Robson, J., Aksenov, Y., Bracegirdle, T. J., Dimdore-Miles, O., Griffiths,
P. T., Grosvenor, D. P., Hodson, D. L. R., Keeble, J., MacIntosh, C., Megann,
A., Osprey, S., Povey, A. C., Schröder, D., Yang, M., Archibald, A. T.,
Carslaw, K. S., Gray, L., Jones, C., Kerridge, B., Knappett, D., Kuhlbrodt,
T., Russo, M., Sellar, A., Siddans, R., Sinha, B., Sutton, R., Walton, J.,
and Wilcox, L. J.: The Evaluation of the North Atlantic Climate
System in UKESM1 Historical Simulations for CMIP6, J. Adv. Model. Earth Sy., 12, e2020MS002126,
https://doi.org/10.1029/2020MS002126, 2020. a
Scaife, A. A. and Smith, D.: A Signal-to-Noise Paradox in Climate Science, npj
Climate and Atmospheric Science, 1, 1–8, https://doi.org/10.1038/s41612-018-0038-4,
2018. a
Schimanke, S., Zittel, J., Spangehl, T., and Cubasch, U.: Multi-Decadal
Variability of Sudden Stratospheric Warmings in an AOGCM, Geophys. Res. Lett., 38, L01801, https://doi.org/10.1029/2010GL045756, 2011. a, b
Shaw, T. A. and Perlwitz, J.: The Life Cycle of Northern Hemisphere
Downward Wave Coupling between the Stratosphere and Troposphere,
J. Climate, 26, 1745–1763, https://doi.org/10.1175/JCLI-D-12-00251.1, 2013. a
Smeed, D., Moat, B. I., Rayner, D., Johns, W. E., Baringer, M. O., Volkov,
D. L., and Frajka-Williams, E.: Atlantic Meridional Overturning Circulation
Observed by the RAPID-MOCHA-WBTS (RAPID-Meridional
Overturning Circulation and Heatflux Array-Western Boundary Time
Series) Array at 26N from 2004 to 2018, British Oceonograpic Data Centre (BODC) [data set],
https://doi.org/10.5285/8CD7E7BB-9A20-05D8-E053-6C86ABC012C2, 2019. a, b
Smeed, D. A., Josey, S. A., Beaulieu, C., Johns, W. E., Moat, B. I.,
Frajka-Williams, E., Rayner, D., Meinen, C. S., Baringer, M. O., Bryden,
H. L., and McCarthy, G. D.: The North Atlantic Ocean Is in a State of
Reduced Overturning, Geophys. Res. Lett., 45, 1527–1533,
https://doi.org/10.1002/2017GL076350, 2018. a, b
Storkey, D., Blaker, A. T., Mathiot, P., Megann, A., Aksenov, Y., Blockley, E. W., Calvert, D., Graham, T., Hewitt, H. T., Hyder, P., Kuhlbrodt, T., Rae, J. G. L., and Sinha, B.: UK Global Ocean GO6 and GO7: a traceable hierarchy of model resolutions, Geosci. Model Dev., 11, 3187–3213, https://doi.org/10.5194/gmd-11-3187-2018, 2018. a
Sutton, R. T. and Hodson, D. L. R.: Atlantic Ocean Forcing of North
American and European Summer Climate, Science, 309, 115–118,
https://doi.org/10.1126/science.1109496, 2005. a
Taguchi, M.: Is There a Statistical Connection between Stratospheric
Sudden Warming and Tropospheric Blocking Events?, J. Atmos. Sci., 65, 1442–1454, https://doi.org/10.1175/2007JAS2363.1, 2008. a
Tang, Y., Rumbold, S., Ellis, R., Kelley, D., Mulcahy, J., Sellar, A., Walton, J., and Jones, C.: MOHC UKESM1.0-LL model output prepared for CMIP6 CMIP piControl, Earth System Grid Federation [data set], https://doi.org/10.22033/ESGF/CMIP6.6298, 2019. a
Thompson, D. W. J., Baldwin, M. P., and Wallace, J. M.: Stratospheric
Connection to Northern Hemisphere Wintertime Weather:
Implications for Prediction, J. Climate, 15, 1421–1428,
https://doi.org/10.1175/1520-0442(2002)015<1421:SCTNHW>2.0.CO;2, 2002. a
Timmermann, A., An, S.-I., Krebs, U., and Goosse, H.: ENSO Suppression Due
to Weakening of the North Atlantic Thermohaline Circulation, J. Climate, 18, 3122–3139, https://doi.org/10.1175/JCLI3495.1, 2005. a
Tomassini, L., Gerber, E. P., Baldwin, M. P., Bunzel, F., and Giorgetta, M.:
The Role of Stratosphere-Troposphere Coupling in the Occurrence of Extreme
Winter Cold Spells over Northern Europe, J. Adv. Model. Earth Sy., 4, M00A03, https://doi.org/10.1029/2012MS000177, 2012. a
Tompkins, A.: On the Relationship between Tropical Convection and Sea Surface
Temperature, J. Climate, 14, 633–637,
https://doi.org/10.1175/1520-0442(2001)014<0633:OTRBTC>2.0.CO;2, 2001. a, b
Torrence, C. and Compo, G. P.: A Practical Guide to Wavelet Analysis.,
B. Am. Meteorol. Soc., 79, 61–78,
https://doi.org/10.1175/1520-0477(1998)079<0061:APGTWA>2.0.CO;2, 1998. a, b, c, d
Tulloch, R. and Marshall, J.: Exploring Mechanisms of Variability and
Predictability of Atlantic Meridional Overturning Circulation in
Two Coupled Climate Models, J. Climate, 25, 4067–4080,
https://doi.org/10.1175/JCLI-D-11-00460.1, 2012. a
Vial, J., Osborn, T., and Lott, F.: Sudden Stratospheric Warmings and
Tropospheric Blockings in a Multi-Century Simulation of the IPSL-CM5A
Coupled Climate Model, Clim. Dynam., 40, 2401–2414, https://doi.org/10.1007/s00382-013-1675-2, 2013. a
Visbeck, M., Cullen, H., Krahmann, G., and Naik, N.: An Ocean Model's Response
to North Atlantic Oscillation-like Wind Forcing, Geophys. Res. Lett., 25, 4521–4524, https://doi.org/10.1029/1998GL900162, 1998.
a
Walters, D., Baran, A. J., Boutle, I., Brooks, M., Earnshaw, P., Edwards, J., Furtado, K., Hill, P., Lock, A., Manners, J., Morcrette, C., Mulcahy, J., Sanchez, C., Smith, C., Stratton, R., Tennant, W., Tomassini, L., Van Weverberg, K., Vosper, S., Willett, M., Browse, J., Bushell, A., Carslaw, K., Dalvi, M., Essery, R., Gedney, N., Hardiman, S., Johnson, B., Johnson, C., Jones, A., Jones, C., Mann, G., Milton, S., Rumbold, H., Sellar, A., Ujiie, M., Whitall, M., Williams, K., and Zerroukat, M.: The Met Office Unified Model Global Atmosphere 7.0/7.1 and JULES Global Land 7.0 configurations, Geosci. Model Dev., 12, 1909–1963, https://doi.org/10.5194/gmd-12-1909-2019, 2019. a, b
Wang, Z., Lu, Y., Dupont, F., W. Loder, J., Hannah, C., and G. Wright, D.:
Variability of Sea Surface Height and Circulation in the North Atlantic:
Forcing Mechanisms and Linkages, Prog. Oceanogr., 132, 273–286,
https://doi.org/10.1016/j.pocean.2013.11.004, 2015. a
Wang, Z., Brickman, D., and Greenan, B. J. W.: Characteristic Evolution of the
Atlantic Meridional Overturning Circulation from 1990 to 2015: An
Eddy-Resolving Ocean Model Study, Deep Sea Research Part I: Oceanographic
Research Papers, 149, 103056, https://doi.org/10.1016/j.dsr.2019.06.002, 2019. a
White, I. P., Garfinkel, C. I., Gerber, E. P., Jucker, M., Hitchcock, P., and
Rao, J.: The Generic Nature of the Tropospheric Response to Sudden
Stratospheric Warmings, J. Climate, 33, 5589–5610,
https://doi.org/10.1175/JCLI-D-19-0697.1, 2020. a
Williams, K. D., Copsey, D., Blockley, E. W., Bodas-Salcedo, A., Calvert, D.,
Comer, R., Davis, P., Graham, T., Hewitt, H. T., Hill, R., Hyder, P., Ineson,
S., Johns, T. C., Keen, A. B., Lee, R. W., Megann, A., Milton, S. F., Rae, J.
G. L., Roberts, M. J., Scaife, A. A., Schiemann, R., Storkey, D., Thorpe, L.,
Watterson, I. G., Walters, D. N., West, A., Wood, R. A., Woollings, T., and
Xavier, P. K.: The Met Office Global Coupled Model 3.0 and 3.1 (GC3.0
and GC3.1) Configurations, J. Adv. Model. Earth Sy., 10, 357–380, https://doi.org/10.1002/2017MS001115, 2018. a
Xu, X., Chassignet, E. P., Johns, W. E., Schmitz, W. J., and Metzger, E. J.:
Intraseasonal to Interannual Variability of the Atlantic Meridional
Overturning Circulation from Eddy-Resolving Simulations and Observations,
J. Geophys. Res.-Oceans, 119, 5140–5159,
https://doi.org/10.1002/2014JC009994, 2014. a
Yang, J.: Local and Remote Wind Stress Forcing of the Seasonal Variability of
the Atlantic Meridional Overturning Circulation (AMOC) Transport at
26.5∘ N, J. Geophys. Res.-Oceans, 120,
2488–2503, https://doi.org/10.1002/2014JC010317, 2015. a
Yool, A., Palmiéri, J., Jones, C. G., Sellar, A. A., de Mora, L.,
Kuhlbrodt, T., Popova, E. E., Mulcahy, J. P., Wiltshire, A., Rumbold, S. T.,
Stringer, M., Hill, R. S. R., Tang, Y., Walton, J., Blaker, A., Nurser, A.
J. G., Coward, A. C., Hirschi, J., Woodward, S., Kelley, D. I., Ellis, R.,
and Rumbold-Jones, S.: Spin-up of UK Earth System Model 1 (UKESM1)
for CMIP6, J. Adv. Model. Earth Sy., 12,
e2019MS001933, https://doi.org/10.1029/2019MS001933, 2020. a
Zhang, R.: Latitudinal Dependence of Atlantic Meridional Overturning
Circulation (AMOC) Variations, Geophys. Res. Lett., 37, L16703,
https://doi.org/10.1029/2010GL044474, 2010. a
Short summary
This study examines interactions between variations in the strength of polar stratospheric winds and circulation in the North Atlantic in a climate model simulation. It finds that the Atlantic Meridional Overturning Circulation (AMOC) responds with oscillations to sets of consecutive Northern Hemisphere winters, which show all strong or all weak polar vortex conditions. The study also shows that a set of strong vortex winters in the 1990s contributed to the recent slowdown in the observed AMOC.
This study examines interactions between variations in the strength of polar stratospheric winds...
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