Articles | Volume 21, issue 10
https://doi.org/10.5194/acp-21-7515-2021
© Author(s) 2021. 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-21-7515-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
18 May 2021
Research article |
| 18 May 2021
| 18 May 2021
The advective Brewer–Dobson circulation in the ERA5 reanalysis: climatology, variability, and trends
Institute of Energy and Climate Research, Stratosphere (IEK-7), Forschungszentrum Jülich, 52 425 Jülich, Germany
Manfred Ern
Institute of Energy and Climate Research, Stratosphere (IEK-7), Forschungszentrum Jülich, 52 425 Jülich, Germany
Felix Ploeger
CORRESPONDING AUTHOR
Institute of Energy and Climate Research, Stratosphere (IEK-7), Forschungszentrum Jülich, 52 425 Jülich, Germany
Institute for Atmospheric and Environmental Research, University of Wuppertal, Wuppertal, Germany
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Laura N. Saunders, Kaley A. Walker, Gabriele P. Stiller, Thomas von Clarmann, Florian Haenel, Hella Garny, Harald Bönisch, Chris D. Boone, Ariana E. Castillo, Andreas Engel, Johannes C. Laube, Marianna Linz, Felix Ploeger, David A. Plummer, Eric A. Ray, and Patrick E. Sheese
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Hongyue Wang, Mijeong Park, Mengchu Tao, Cristina Peña-Ortiz, Nuria Pilar Plaza, Felix Ploeger, and Paul Konopka
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Sebastian Rhode, Peter Preusse, Jörn Ungermann, Inna Polichtchouk, Kaoru Sato, Shingo Watanabe, Manfred Ern, Karlheinz Nogai, Björn-Martin Sinnhuber, and Martin Riese
Atmos. Meas. Tech., 17, 5785–5819, https://doi.org/10.5194/amt-17-5785-2024, https://doi.org/10.5194/amt-17-5785-2024, 2024
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Björn Linder, Peter Preusse, Qiuyu Chen, Ole Martin Christensen, Lukas Krasauskas, Linda Megner, Manfred Ern, and Jörg Gumbel
Atmos. Meas. Tech., 17, 3829–3841, https://doi.org/10.5194/amt-17-3829-2024, https://doi.org/10.5194/amt-17-3829-2024, 2024
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The Swedish research satellite MATS (Mesospheric Airglow/Aerosol Tomography and Spectroscopy) is designed to study atmospheric waves in the mesosphere and lower thermosphere. These waves perturb the temperature field, and thus, by observing three-dimensional temperature fluctuations, their properties can be quantified. This pre-study uses synthetic MATS data generated from a general circulation model to investigate how well wave properties can be retrieved.
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.
Martin Ebert, Ralf Weigel, Stephan Weinbruch, Lisa Schneider, Konrad Kandler, Stefan Lauterbach, Franziska Köllner, Felix Plöger, Gebhard Günther, Bärbel Vogel, and Stephan Borrmann
Atmos. Chem. Phys., 24, 4771–4788, https://doi.org/10.5194/acp-24-4771-2024, https://doi.org/10.5194/acp-24-4771-2024, 2024
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Particles were collected during the flight campaign StratoClim 2017 within the Asian tropopause aerosol layer (ATAL). Refractory particles from seven different flights were characterized by scanning and transmission electron microscopy (SEM, TEM). The most abundant refractory particles are silicates and non-volatile organics. The most important sources are combustion processes at the ground and the agitation of soil material. During one flight, small cinnabar particles (HgS) were also detected.
Felix Ploeger, Thomas Birner, Edward Charlesworth, Paul Konopka, and Rolf Müller
Atmos. Chem. Phys., 24, 2033–2043, https://doi.org/10.5194/acp-24-2033-2024, https://doi.org/10.5194/acp-24-2033-2024, 2024
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We present a novel mechanism of how regional anomalies in water vapour concentrations in the upper troposphere and lower stratosphere impact regional atmospheric circulation systems. These impacts include a displaced upper-level Asian monsoon circulation and strengthened prevailing westerlies in the Pacific region. Current climate models have biases in simulating these regional water vapour anomalies and circulation impacts, but the biases can be avoided by improving the model transport.
Jan Clemens, Bärbel Vogel, Lars Hoffmann, Sabine Griessbach, Nicole Thomas, Suvarna Fadnavis, Rolf Müller, Thomas Peter, and Felix Ploeger
Atmos. Chem. Phys., 24, 763–787, https://doi.org/10.5194/acp-24-763-2024, https://doi.org/10.5194/acp-24-763-2024, 2024
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The source regions of the Asian tropopause aerosol layer (ATAL) are debated. We use balloon-borne measurements of the layer above Nainital (India) in August 2016 and atmospheric transport models to find ATAL source regions. Most air originated from the Tibetan plateau. However, the measured ATAL was stronger when more air originated from the Indo-Gangetic Plain and weaker when more air originated from the Pacific. Hence, the results indicate important anthropogenic contributions to the ATAL.
Bärbel Vogel, C. Michael Volk, Johannes Wintel, Valentin Lauther, Jan Clemens, Jens-Uwe Grooß, Gebhard Günther, Lars Hoffmann, Johannes C. Laube, Rolf Müller, Felix Ploeger, and Fred Stroh
Atmos. Chem. Phys., 24, 317–343, https://doi.org/10.5194/acp-24-317-2024, https://doi.org/10.5194/acp-24-317-2024, 2024
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Over the Indian subcontinent, polluted air is rapidly uplifted to higher altitudes during the Asian monsoon season. We present an assessment of vertical transport in this region using different wind data provided by the European Centre for Medium-Range Weather Forecasts (ECMWF), as well as high-resolution aircraft measurements. In general, our findings confirm that the newest ECMWF reanalysis product, ERA5, yields a better representation of transport compared to the predecessor, ERA-Interim.
Paul Konopka, Christian Rolf, Marc von Hobe, Sergey M. Khaykin, Benjamin Clouser, Elisabeth Moyer, Fabrizio Ravegnani, Francesco D'Amato, Silvia Viciani, Nicole Spelten, Armin Afchine, Martina Krämer, Fred Stroh, and Felix Ploeger
Atmos. Chem. Phys., 23, 12935–12947, https://doi.org/10.5194/acp-23-12935-2023, https://doi.org/10.5194/acp-23-12935-2023, 2023
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We studied water vapor in a critical region of the atmosphere, the Asian summer monsoon anticyclone, using rare in situ observations. Our study shows that extremely high water vapor values observed in the stratosphere within the Asian monsoon anticyclone still undergo significant freeze-drying and that water vapor concentrations set by the Lagrangian dry point are a better proxy for the stratospheric water vapor budget than rare observations of enhanced water mixing ratios.
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.
Manfred Ern, Mohamadou A. Diallo, Dina Khordakova, Isabell Krisch, Peter Preusse, Oliver Reitebuch, Jörn Ungermann, and Martin Riese
Atmos. Chem. Phys., 23, 9549–9583, https://doi.org/10.5194/acp-23-9549-2023, https://doi.org/10.5194/acp-23-9549-2023, 2023
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Quasi-biennial oscillation (QBO) of the stratospheric tropical winds is an important mode of climate variability but is not well reproduced in free-running climate models. We use the novel global wind observations by the Aeolus satellite and radiosondes to show that the QBO is captured well in three modern reanalyses (ERA-5, JRA-55, and MERRA-2). Good agreement is also found also between Aeolus and reanalyses for large-scale tropical wave modes in the upper troposphere and lower stratosphere.
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.
Qiuyu Chen, Konstantin Ntokas, Björn Linder, Lukas Krasauskas, Manfred Ern, Peter Preusse, Jörn Ungermann, Erich Becker, Martin Kaufmann, and Martin Riese
Atmos. Meas. Tech., 15, 7071–7103, https://doi.org/10.5194/amt-15-7071-2022, https://doi.org/10.5194/amt-15-7071-2022, 2022
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Observations of phase speed and direction spectra as well as zonal mean net gravity wave momentum flux are required to understand how gravity waves reach the mesosphere–lower thermosphere and how they there interact with background flow. To this end we propose flying two CubeSats, each deploying a spatial heterodyne spectrometer for limb observation of the airglow. End-to-end simulations demonstrate that individual gravity waves are retrieved faithfully for the expected instrument performance.
Manfred Ern, Peter Preusse, and Martin Riese
Atmos. Chem. Phys., 22, 15093–15133, https://doi.org/10.5194/acp-22-15093-2022, https://doi.org/10.5194/acp-22-15093-2022, 2022
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Based on data from the HIRDLS and SABER infrared limb sounding satellite instruments, we investigate the intermittency of global distributions of gravity wave (GW) potential energies and GW momentum fluxes in the stratosphere and mesosphere using probability distribution functions (PDFs) and Gini coefficients. We compare GW intermittency in different regions, seasons, and altitudes. These results can help to improve GW parameterizations and the distributions of GWs resolved in models.
Bernard Legras, Clair Duchamp, Pasquale Sellitto, Aurélien Podglajen, Elisa Carboni, Richard Siddans, Jens-Uwe Grooß, Sergey Khaykin, and Felix Ploeger
Atmos. Chem. Phys., 22, 14957–14970, https://doi.org/10.5194/acp-22-14957-2022, https://doi.org/10.5194/acp-22-14957-2022, 2022
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The long-duration atmospheric impact of the Tonga eruption in January 2022 is a plume of water and sulfate aerosols in the stratosphere that persisted for more than 6 months. We study this evolution using several satellite instruments and analyse the unusual behaviour of this plume as sulfates and water first moved down rapidly and then separated into two layers. We also report the self-organization in compact and long-lived patches.
Mohamadou A. Diallo, Felix Ploeger, Michaela I. Hegglin, Manfred Ern, Jens-Uwe Grooß, Sergey Khaykin, and Martin Riese
Atmos. Chem. Phys., 22, 14303–14321, https://doi.org/10.5194/acp-22-14303-2022, https://doi.org/10.5194/acp-22-14303-2022, 2022
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The quasi-biennial oacillation disruption events in both 2016 and 2020 decreased lower-stratospheric water vapour and ozone. Differences in the strength and depth of the anomalous lower-stratospheric circulation and ozone are due to differences in tropical upwelling and cold-point temperature induced by lower-stratospheric planetary and gravity wave breaking. The differences in water vapour are due to higher cold-point temperature in 2020 induced by Australian wildfire.
Paul Konopka, Mengchu Tao, Marc von Hobe, Lars Hoffmann, Corinna Kloss, Fabrizio Ravegnani, C. Michael Volk, Valentin Lauther, Andreas Zahn, Peter Hoor, and Felix Ploeger
Geosci. Model Dev., 15, 7471–7487, https://doi.org/10.5194/gmd-15-7471-2022, https://doi.org/10.5194/gmd-15-7471-2022, 2022
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Pure trajectory-based transport models driven by meteorology derived from reanalysis products (ERA5) take into account only the resolved, advective part of transport. That means neither mixing processes nor unresolved subgrid-scale advective processes like convection are included. The Chemical Lagrangian Model of the Stratosphere (CLaMS) includes these processes. We show that isentropic mixing dominates unresolved transport. The second most important transport process is unresolved convection.
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.
Suvarna Fadnavis, Prashant Chavan, Akash Joshi, Sunil M. Sonbawne, Asutosh Acharya, Panuganti C. S. Devara, Alexandru Rap, Felix Ploeger, and Rolf Müller
Atmos. Chem. Phys., 22, 7179–7191, https://doi.org/10.5194/acp-22-7179-2022, https://doi.org/10.5194/acp-22-7179-2022, 2022
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We show that large amounts of anthropogenic aerosols are transported from South Asia to the northern Indian Ocean. These aerosols are then lifted into the UTLS by the ascending branch of the Hadley circulation. They are further transported to the Southern Hemisphere and downward via westerly ducts over the tropical Atlantic and Pacific. These aerosols increase tropospheric heating, resulting in an increase in water vapor, which is then transported to the UTLS.
Felix Ploeger and Hella Garny
Atmos. Chem. Phys., 22, 5559–5576, https://doi.org/10.5194/acp-22-5559-2022, https://doi.org/10.5194/acp-22-5559-2022, 2022
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We investigate hemispheric asymmetries in stratospheric circulation changes in the last 2 decades in model simulations and atmospheric observations. We find that observed trace gas changes can be explained by a structural circulation change related to a deepening circulation in the Northern Hemisphere relative to the Southern Hemisphere. As this asymmetric signal is small compared to internal variability observed circulation trends over the recent past are not in contradiction to climate models.
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.
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.
Christoph Mahnke, Ralf Weigel, Francesco Cairo, Jean-Paul Vernier, Armin Afchine, Martina Krämer, Valentin Mitev, Renaud Matthey, Silvia Viciani, Francesco D'Amato, Felix Ploeger, Terry Deshler, and Stephan Borrmann
Atmos. Chem. Phys., 21, 15259–15282, https://doi.org/10.5194/acp-21-15259-2021, https://doi.org/10.5194/acp-21-15259-2021, 2021
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In 2017, in situ aerosol measurements were conducted aboard the M55 Geophysica in the Asian monsoon region. The vertical particle mixing ratio profiles show a distinct layer (15–18.5 km), the Asian tropopause aerosol layer (ATAL). The backscatter ratio (BR) was calculated based on the aerosol size distributions and compared with the BRs detected by a backscatter probe and a lidar aboard M55, and by the CALIOP lidar. All four methods show enhanced BRs in the ATAL altitude range (max. at 17.5 km).
Manfred Ern, Mohamadou Diallo, Peter Preusse, Martin G. Mlynczak, Michael J. Schwartz, Qian Wu, and Martin Riese
Atmos. Chem. Phys., 21, 13763–13795, https://doi.org/10.5194/acp-21-13763-2021, https://doi.org/10.5194/acp-21-13763-2021, 2021
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Details of the driving of the semiannual oscillation (SAO) of the tropical winds in the middle atmosphere are still not known. We investigate the SAO and its driving by small-scale gravity waves (GWs) using satellite data and different reanalyses. In a large altitude range, GWs mainly drive the SAO westerlies, but in the upper mesosphere GWs seem to drive both SAO easterlies and westerlies. Reanalyses reproduce some features of the SAO but are limited by model-inherent damping at upper levels.
Ralf Weigel, Christoph Mahnke, Manuel Baumgartner, Antonis Dragoneas, Bärbel Vogel, Felix Ploeger, Silvia Viciani, Francesco D'Amato, Silvia Bucci, Bernard Legras, Beiping Luo, and Stephan Borrmann
Atmos. Chem. Phys., 21, 11689–11722, https://doi.org/10.5194/acp-21-11689-2021, https://doi.org/10.5194/acp-21-11689-2021, 2021
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In July and August 2017, eight StratoClim mission flights of the Geophysica reached up to 20 km in the Asian monsoon anticyclone. New particle formation (NPF) was identified in situ by abundant nucleation-mode aerosols (6–15 nm in diameter) with mixing ratios of up to 50 000 mg−1. NPF occurred most frequently at 12–16 km with fractions of non-volatile residues of down to 15 %. Abundance and productivity of observed NPF indicate its ability to promote the Asian tropopause aerosol layer.
Markus Geldenhuys, Peter Preusse, Isabell Krisch, Christoph Zülicke, Jörn Ungermann, Manfred Ern, Felix Friedl-Vallon, and Martin Riese
Atmos. Chem. Phys., 21, 10393–10412, https://doi.org/10.5194/acp-21-10393-2021, https://doi.org/10.5194/acp-21-10393-2021, 2021
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A large-scale gravity wave (GW) was observed spanning the whole of Greenland. The GWs proposed in this paper come from a new jet–topography mechanism. The topography compresses the flow and triggers a change in u- and
v-wind components. The jet becomes out of geostrophic balance and sheds energy in the form of GWs to restore the balance. This topography–jet interaction was not previously considered by the community, rendering the impact of the gravity waves largely unaccounted for.
Lukas Krasauskas, Jörn Ungermann, Peter Preusse, Felix Friedl-Vallon, Andreas Zahn, Helmut Ziereis, Christian Rolf, Felix Plöger, Paul Konopka, Bärbel Vogel, and Martin Riese
Atmos. Chem. Phys., 21, 10249–10272, https://doi.org/10.5194/acp-21-10249-2021, https://doi.org/10.5194/acp-21-10249-2021, 2021
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A Rossby wave (RW) breaking event was observed over the North Atlantic during the WISE measurement campaign in October 2017. Infrared limb sounding measurements of trace gases in the lower stratosphere, including high-resolution 3-D tomographic reconstruction, revealed complex spatial structures in stratospheric tracers near the polar jet related to previous RW breaking events. Backward-trajectory analysis and tracer correlations were used to study mixing and stratosphere–troposphere exchange.
Nuria Pilar Plaza, Aurélien Podglajen, Cristina Peña-Ortiz, and Felix Ploeger
Atmos. Chem. Phys., 21, 9585–9607, https://doi.org/10.5194/acp-21-9585-2021, https://doi.org/10.5194/acp-21-9585-2021, 2021
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We study the role of different processes in setting the lower stratospheric water vapour. We find that mechanisms involving ice microphysics and small-scale mixing produce the strongest increase in water vapour, in particular over the Asian Monsoon. Small-scale mixing has a special relevance as it improves the agreement with observations at seasonal and intra-seasonal timescales, contrary to the North American Monsoon case, in which large-scale temperatures still dominate its variability.
Felix Ploeger, Mohamadou Diallo, Edward Charlesworth, Paul Konopka, Bernard Legras, Johannes C. Laube, Jens-Uwe Grooß, Gebhard Günther, Andreas Engel, and Martin Riese
Atmos. Chem. Phys., 21, 8393–8412, https://doi.org/10.5194/acp-21-8393-2021, https://doi.org/10.5194/acp-21-8393-2021, 2021
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We investigate the global stratospheric circulation (Brewer–Dobson circulation) in the new ECMWF ERA5 reanalysis based on age of air simulations, and we compare it to results from the preceding ERA-Interim reanalysis. Our results show a slower stratospheric circulation and higher age for ERA5. The age of air trend in ERA5 over the 1989–2018 period is negative throughout the stratosphere, related to multi-annual variability and a potential contribution from changes in the reanalysis system.
Xiaolu Yan, Paul Konopka, Marius Hauck, Aurélien Podglajen, and Felix Ploeger
Atmos. Chem. Phys., 21, 6627–6645, https://doi.org/10.5194/acp-21-6627-2021, https://doi.org/10.5194/acp-21-6627-2021, 2021
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Inter-hemispheric transport is important for understanding atmospheric tracers because of the asymmetry in emissions between the Southern Hemisphere (SH) and Northern Hemisphere (NH). This study finds that the air masses from the NH extratropics to the atmosphere are about 5 times larger than those from the SH extratropics. The interplay between the Asian summer monsoon and westerly ducts triggers the cross-Equator transport from the NH to the SH in boreal summer and fall.
Marc von Hobe, Felix Ploeger, Paul Konopka, Corinna Kloss, Alexey Ulanowski, Vladimir Yushkov, Fabrizio Ravegnani, C. Michael Volk, Laura L. Pan, Shawn B. Honomichl, Simone Tilmes, Douglas E. Kinnison, Rolando R. Garcia, and Jonathon S. Wright
Atmos. Chem. Phys., 21, 1267–1285, https://doi.org/10.5194/acp-21-1267-2021, https://doi.org/10.5194/acp-21-1267-2021, 2021
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The Asian summer monsoon (ASM) is known to foster transport of polluted tropospheric air into the stratosphere. To test and amend our picture of ASM vertical transport, we analyse distributions of airborne trace gas observations up to 20 km altitude near the main ASM vertical conduit south of the Himalayas. We also show that a new high-resolution version of the global chemistry climate model WACCM is able to reproduce the observations well.
Corinna Kloss, Gwenaël Berthet, Pasquale Sellitto, Felix Ploeger, Ghassan Taha, Mariam Tidiga, Maxim Eremenko, Adriana Bossolasco, Fabrice Jégou, Jean-Baptiste Renard, and Bernard Legras
Atmos. Chem. Phys., 21, 535–560, https://doi.org/10.5194/acp-21-535-2021, https://doi.org/10.5194/acp-21-535-2021, 2021
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The year 2019 was particularly rich for the stratospheric aerosol layer due to two volcanic eruptions (at Raikoke and Ulawun) and wildfire events. With satellite observations and models, we describe the exceptionally complex situation following the Raikoke eruption. The respective plume overwhelmed the Northern Hemisphere stratosphere in terms of aerosol load and resulted in the highest climate impact throughout the past decade.
Manuel Baumgartner, Ralf Weigel, Allan H. Harvey, Felix Plöger, Ulrich Achatz, and Peter Spichtinger
Atmos. Chem. Phys., 20, 15585–15616, https://doi.org/10.5194/acp-20-15585-2020, https://doi.org/10.5194/acp-20-15585-2020, 2020
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The potential temperature is routinely used in atmospheric science. We review its derivation and suggest a new potential temperature, based on a temperature-dependent parameterization of the dry air's specific heat capacity. Moreover, we compare the new potential temperature to the common one and discuss the differences which become more important at higher altitudes. Finally, we indicate some consequences of using the new potential temperature in typical applications.
Edward J. Charlesworth, Ann-Kristin Dugstad, Frauke Fritsch, Patrick Jöckel, and Felix Plöger
Atmos. Chem. Phys., 20, 15227–15245, https://doi.org/10.5194/acp-20-15227-2020, https://doi.org/10.5194/acp-20-15227-2020, 2020
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Modeling the stratosphere requires models with good representations of chemical transport. To do this, nearly all models divide the atmosphere into boxes. This creates some unwanted problems. However, the only other option is to divide the atmosphere into balloons, and this method is very complicated. Here, we use a model which uses this balloon-like method to estimate the impacts of this method on chemical transport. We find significant differences in sensitive regions of the stratosphere.
Isabell Krisch, Manfred Ern, Lars Hoffmann, Peter Preusse, Cornelia Strube, Jörn Ungermann, Wolfgang Woiwode, and Martin Riese
Atmos. Chem. Phys., 20, 11469–11490, https://doi.org/10.5194/acp-20-11469-2020, https://doi.org/10.5194/acp-20-11469-2020, 2020
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In 2016, a scientific research flight above Scandinavia acquired various atmospheric data (temperature, gas composition, etc.). Through advanced 3-D reconstruction methods, a superposition of multiple gravity waves was identified. An in-depth analysis enabled the characterisation of these waves as well as the identification of their sources. This work will enable a better understanding of atmosphere dynamics and could lead to improved climate projections.
Cornelia Strube, Manfred Ern, Peter Preusse, and Martin Riese
Atmos. Meas. Tech., 13, 4927–4945, https://doi.org/10.5194/amt-13-4927-2020, https://doi.org/10.5194/amt-13-4927-2020, 2020
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We present how inertial instabilities affect gravity wave background removal filters on different temperature data sets. Vertical filtering has to remove a part of the gravity wave spectrum to eliminate inertial instability remnants, while horizontal filtering leaves typical gravity wave scales untouched. In addition, we show that it is possible to separate inertial instabilities from gravity wave perturbations for infrared limb-sounding satellite profiles using a cutoff zonal wavenumber of 6.
Johannes C. Laube, Emma C. Leedham Elvidge, Karina E. Adcock, Bianca Baier, Carl A. M. Brenninkmeijer, Huilin Chen, Elise S. Droste, Jens-Uwe Grooß, Pauli Heikkinen, Andrew J. Hind, Rigel Kivi, Alexander Lojko, Stephen A. Montzka, David E. Oram, Steve Randall, Thomas Röckmann, William T. Sturges, Colm Sweeney, Max Thomas, Elinor Tuffnell, and Felix Ploeger
Atmos. Chem. Phys., 20, 9771–9782, https://doi.org/10.5194/acp-20-9771-2020, https://doi.org/10.5194/acp-20-9771-2020, 2020
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We demonstrate that AirCore technology, which is based on small low-cost balloons, can provide access to trace gas measurements such as CFCs at ultra-low abundances. This is a new way to quantify ozone-depleting, and related, substances in the stratosphere, which is largely inaccessible to aircraft. We show two potential uses: (a) tracking the stratospheric circulation, which is predicted to change, and (b) assessing three common meteorological reanalyses driving a global stratospheric model.
Cited articles
Alexander, M. J. and Rosenlof, K. H.:
Nonstationary gravity wave forcing of the stratospheric zonal mean wind,
J. Geophys. Res.-Atmos.,
101, 23465–23474, https://doi.org/10.1029/96JD02197, 1996. a, b, c, d
Anstey, J. A., Scinocca, J. F., and Keller, M.:
Simulating the QBO in an Atmospheric General Circulation Model: Sensitivity to Resolved and Parameterized Forcing,
J. Atmos. Sci.,
73, 1649–1665, https://doi.org/10.1175/JAS-D-15-0099.1, 2016. a
Baldwin, M. P. and Dunkerton, T. J.:
Stratospheric Harbingers of Anomalous Weather Regimes,
Science,
294, 581–584, https://doi.org/10.1126/science.1063315, 2001. a
Baldwin, M. P. and O'Sullivan, D.:
Stratospheric Effects of ENSO-Related Tropospheric Circulation Anomalies,
J. Climate,
8, 649–667, https://doi.org/10.1175/1520-0442(1995)008<0649:SEOERT>2.0.CO;2, 1995. a
Baldwin, M. P., Gray, L. J., Dunkerton, T. J., Hamilton, K., Haynes, P. H., Randel, W. J., Holton, J. R., Alexander, M. J., Hirota, I., Horinouchi, T., Jones, D. B. A., Kinnersley, J. S., Marquardt, C., Sato, K., and Takahashi, M.:
The quasi-biennial oscillation,
Rev. Geophys.,
39, 179–229, https://doi.org/10.1029/1999RG000073, 2001. a, b
Banerjee, A., Maycock, A. C., Archibald, A. T., Abraham, N. L., Telford, P., Braesicke, P., and Pyle, J. A.: Drivers of changes in stratospheric and tropospheric ozone between year 2000 and 2100, Atmos. Chem. Phys., 16, 2727–2746, https://doi.org/10.5194/acp-16-2727-2016, 2016. a
Birner, T. and Bönisch, H.: Residual circulation trajectories and transit times into the extratropical lowermost stratosphere, Atmos. Chem. Phys., 11, 817–827, https://doi.org/10.5194/acp-11-817-2011, 2011. a, b
Bjerknes, J.:
Atmospheric teleconnections from the equatorial Pacific,
Mon. Weather Rev.,
97, 163–172, https://doi.org/10.1175/1520-0493(1969)097<0163:ATFTEP>2.3.CO;2, 1969. a
Bönisch, H., Engel, A., Birner, Th., Hoor, P., Tarasick, D. W., and Ray, E. A.: On the structural changes in the Brewer-Dobson circulation after 2000, Atmos. Chem. Phys., 11, 3937–3948, https://doi.org/10.5194/acp-11-3937-2011, 2011. a, b
Butchart, N.:
The Brewer–Dobson circulation,
Rev. Geophys.,
52, 157–184, https://doi.org/10.1002/2013RG000448, 2014. a, b, c, d
Butchart, N., Cionni, I., Eyring, V., Shepherd, T. G., Waugh, D. W., Akiyoshi, H., Austin, J., Brühl, C., Chipperfield, M. P., Cordero, E., Dameris, M., Deckert, R., Dhomse, S., Frith, S. M., Garcia, R. R., Gettelman, A., Giorgetta, M. A., Kinnison, D. E., Li, F., Mancini, E., McLandress, C., Pawson, S., Pitari, G., Plummer, D. A., Rozanov, E., Sassi, F., Scinocca, J. F., Shibata, K., Steil, B., and Tian, W.:
Chemistry–Climate Model simulations of twenty-first century stratospheric climate and circulation changes,
J. Climate,
23, 5349–5374, https://doi.org/10.1175/2010JCLI3404.1, 2010. a, b, c, d, e, f, g, h, i
Cagnazzo, C. and Manzini, E.:
Impact of the Stratosphere on the Winter Tropospheric Teleconnections between ENSO and the North Atlantic and European Region,
J. Climate,
22, 1223–1238, https://doi.org/10.1175/2008JCLI2549.1, 2009. a
Cai, W., Borlace, S., Lengaigne, M., van Rensch, P., Collins, M., Vecchi, G., Timmermann, A., Santoso, A., McPhaden, M. J., Wu, L., England, M. H., Wang, G., Guilyardi, E., and Jin, F.-F.:
Increasing frequency of extreme El Niño events due to greenhouse warming,
Nat. Clim. Change,
4, 111–116, https://doi.org/10.1038/nclimate2100, 2014. a
Calvo, N., Garcia, R. R., Randel, W. J., and Marsh, D. R.:
Dynamical mechanism for the increase in tropical upwelling in the lowermost tropical stratosphere during warm ENSO events,
J. Atmos. Sci.,
67, 2331–2340, https://doi.org/10.1175/2010JAS3433.1, 2010. a, b
Chabrillat, S., Vigouroux, C., Christophe, Y., Engel, A., Errera, Q., Minganti, D., Monge-Sanz, B. M., Segers, A., and Mahieu, E.: Comparison of mean age of air in five reanalyses using the BASCOE transport model, Atmos. Chem. Phys., 18, 14715–14735, https://doi.org/10.5194/acp-18-14715-2018, 2018. a, b, c, d
Charney, J. G. and Drazin, P. G.:
Propagation of planetary-scale disturbances from the lower into upper stratophere,
J. Geophys. Res.,
66, 83–109, 1961. a
Choi, W., Lee, H., Grant, W. B., Park, J. H., Holton, J. R., Lee, K.-M., and Naujokat, B.:
On the secondary meridional circulation associated with the quasi-biennial oscillation,
Tellus B,
54, 395–406, https://doi.org/10.3402/tellusb.v54i4.16673, 2002. a
Chrysanthou, A., Maycock, A. C., Chipperfield, M. P., Dhomse, S., Garny, H., Kinnison, D., Akiyoshi, H., Deushi, M., Garcia, R. R., Jöckel, P., Kirner, O., Pitari, G., Plummer, D. A., Revell, L., Rozanov, E., Stenke, A., Tanaka, T. Y., Visioni, D., and Yamashita, Y.: The effect of atmospheric nudging on the stratospheric residual circulation in chemistry–climate models, Atmos. Chem. Phys., 19, 11559–11586, https://doi.org/10.5194/acp-19-11559-2019, 2019. a, b
Chun, H.-Y., Song, I.-S., Baik, J.-J., and Kim, Y.-J.:
Impact of a Convectively Forced Gravity Wave Drag Parameterization in NCAR CCM3,
J. Climate,
17, 3530–3547, https://doi.org/10.1175/1520-0442(2004)017<3530:IOACFG>2.0.CO;2, 2004. a
Collimore, C. C., Martin, D. W., Hitchman, M. H., Huesmann, A., and Waliser, D. E.:
On The Relationship between the QBO and Tropical Deep Convection,
J. Climate,
16, 2552–2568, https://doi.org/10.1175/1520-0442(2003)016<2552:OTRBTQ>2.0.CO;2, 2003. a, b
Davis, N. A., Davis, S. M., Portmann, R. W., Ray, E., Rosenlof, K. H., and Yu, P.: A comprehensive assessment of tropical stratospheric upwelling in the specified dynamics Community Earth System Model 1.2.2 – Whole Atmosphere Community Climate Model (CESM (WACCM)), Geosci. Model Dev., 13, 717–734, https://doi.org/10.5194/gmd-13-717-2020, 2020. a, b
Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P., Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P., Bechtold, P., Beljaars, A. C. M., van de Berg, L., Bidlot, J., Bormann, N., Delsol, C., Dragani, R., Fuentes, M., Geer, A. J., Haimberger, L., Healy, S. B., Hersbach, H., Hólm, E. V., Isaksen, L., Kållberg, P., Köhler, M., Matricardi, M., McNally, A. P., Monge-Sanz, B. M., Morcrette, J.-J., Park, B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thépaut, J.-N., and Vitart, F.:
The ERA-Interim reanalysis: configuration and performance of the data assimilation system,
Q. J. Roy. Meteor. Soc.,
137, 553–597, https://doi.org/10.1002/qj.828, 2011. a, b, c
Diallo, M., Legras, B., and Chédin, A.: Age of stratospheric air in the ERA-Interim, Atmos. Chem. Phys., 12, 12133–12154, https://doi.org/10.5194/acp-12-12133-2012, 2012. a, b, c, d
Diallo, M., Ploeger, F., Konopka, P., Birner, T., Müller, R., Riese, M., Garny, H., Legras, B., Ray, E., Berthet, G., and Jegou, F.:
Significant Contributions of Volcanic Aerosols to Decadal Changes in the Stratospheric Circulation,
Geophys. Res. Lett.,
44, 10780–10791, https://doi.org/10.1002/2017GL074662, 2017. a, b, c, d
Diallo, M., Riese, M., Birner, T., Konopka, P., Müller, R., Hegglin, M. I., Santee, M. L., Baldwin, M., Legras, B., and Ploeger, F.: Response of stratospheric water vapor and ozone to the unusual timing of El Niño and the QBO disruption in 2015–2016, Atmos. Chem. Phys., 18, 13055–13073, https://doi.org/10.5194/acp-18-13055-2018, 2018. a, b, c, d, e
Diallo, M., Konopka, P., Santee, M. L., Müller, R., Tao, M., Walker, K. A., Legras, B., Riese, M., Ern, M., and Ploeger, F.: Structural changes in the shallow and transition branch of the Brewer–Dobson circulation induced by El Niño, Atmos. Chem. Phys., 19, 425–446, https://doi.org/10.5194/acp-19-425-2019, 2019. a, b, c, d, e, f, g, h, i, j, k
Dietmüller, S., Garny, H., Plöger, F., Jöckel, P., and Cai, D.: Effects of mixing on resolved and unresolved scales on stratospheric age of air, Atmos. Chem. Phys., 17, 7703–7719, https://doi.org/10.5194/acp-17-7703-2017, 2017. a, b
Dunkerton, T. J., Hsu, C.-P., and McIntyre, M. E.:
On the mean meridional mass motions of the stratosphere and mesosphere,
J. Atmos. Sci.,
35, 2325–2333, 1978. a
Dunkerton, T. J., Hsu, C.-P., and McIntyre, M. E.:
Some Eulerian and Lagrangian diagnostics for a model stratospheric warming,
J. Atmos. Sci.,
38, 819–843, 1981. a
Eichinger, R. and Sacha, P.:
Overestimated acceleration of the advective Brewer–Dobson circulation due to stratospheric cooling,
Q. J. Roy. Meteor. Soc.,
146, 3850–3864, https://doi.org/10.1002/qj.3876, 2020. a, b
Eichinger, R., Dietmüller, S., Garny, H., Šácha, P., Birner, T., Bönisch, H., Pitari, G., Visioni, D., Stenke, A., Rozanov, E., Revell, L., Plummer, D. A., Jöckel, P., Oman, L., Deushi, M., Kinnison, D. E., Garcia, R., Morgenstern, O., Zeng, G., Stone, K. A., and Schofield, R.: The influence of mixing on the stratospheric age of air changes in the 21st century, Atmos. Chem. Phys., 19, 921–940, https://doi.org/10.5194/acp-19-921-2019, 2019. a
Eliassen, A. and Palm, E.:
On the transfer of energy in stationary mountain waves,
Geofy. Publ.,
22, 1–23, 1961. a
Engel, A., Möbius, T., Bönisch, H., Schmidt, U., Heinz, R., Levin, I., Atlas, E., Aoki, S., Nakazawa, T., Sugawara, S., Moore, F., Hurst, D., Elkins, J., Schauffler, S., Andrews, A., and Boering, K.:
Age of stratospheric air unchanged within uncertainties over the past 30 years,
Nat. Geosci.,
2, 28–31, https://doi.org/10.1038/ngeo388, 2009. a
Engel, A., Bönisch, H., Ullrich, M., Sitals, R., Membrive, O., Danis, F., and Crevoisier, C.: Mean age of stratospheric air derived from AirCore observations, Atmos. Chem. Phys., 17, 6825–6838, https://doi.org/10.5194/acp-17-6825-2017, 2017. a
Ern, M. and Preusse, P.: Wave fluxes of equatorial Kelvin waves and QBO zonal wind forcing derived from SABER and ECMWF temperature space-time spectra, Atmos. Chem. Phys., 9, 3957–3986, https://doi.org/10.5194/acp-9-3957-2009, 2009. a
Ern, M., Preusse, P., and Riese, M.: Driving of the SAO by gravity waves as observed from satellite, Ann. Geophys., 33, 483–504, https://doi.org/10.5194/angeo-33-483-2015, 2015. a
Ern, M., Trinh, Q. T., Kaufmann, M., Krisch, I., Preusse, P., Ungermann, J., Zhu, Y., Gille, J. C., Mlynczak, M. G., Russell III, J. M., Schwartz, M. J., and Riese, M.: Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings, Atmos. Chem. Phys., 16, 9983–10019, https://doi.org/10.5194/acp-16-9983-2016, 2016. a
Forster, P. M. D. F. and Shine, K. P.:
Radiative forcing and temperature trends from stratospheric ozone changes,
Geophys. Res. Lett.,
102, 10841–10855, https://doi.org/10.1029/96JD03510, 1997. a
Friston, K., Ashburner, J., Kiebel, S. J., Nichols, T. E., and Penny, W. D. (Eds.):
Statistical Parametric Mapping: The Analysis of Functional Brain Images,
available at: http://store.elsevier.com/product.jsp?isbn=9780123725608 (last access: 12 May 2021),
Academic Press, 2007. a
Fu, Q., Solomon, S., Pahlavan, H. A., and Lin, P.:
Observed changes in Brewer–Dobson circulation for 1980–2018,
Environ. Res. Lett.,
14, 114 026, https://doi.org/10.1088/1748-9326/ab4de7, 2019. a, b, c
Fueglistaler, S., Dessler, A. E., Dunkerton, T. J., Folkins, I., Fu, Q., and Mote, P. W.:
Tropical Tropopause Layer,
Rev. Geophys.,
47, https://doi.org/10.1029/2008RG000267, 2009. a
Fujiwara, M., Wright, J. S., Manney, G. L., Gray, L. J., Anstey, J., Birner, T., Davis, S., Gerber, E. P., Harvey, V. L., Hegglin, M. I., Homeyer, C. R., Knox, J. A., Krüger, K., Lambert, A., Long, C. S., Martineau, P., Molod, A., Monge-Sanz, B. M., Santee, M. L., Tegtmeier, S., Chabrillat, S., Tan, D. G. H., Jackson, D. R., Polavarapu, S., Compo, G. P., Dragani, R., Ebisuzaki, W., Harada, Y., Kobayashi, C., McCarty, W., Onogi, K., Pawson, S., Simmons, A., Wargan, K., Whitaker, J. S., and Zou, C.-Z.: Introduction to the SPARC Reanalysis Intercomparison Project (S-RIP) and overview of the reanalysis systems, Atmos. Chem. Phys., 17, 1417–1452, https://doi.org/10.5194/acp-17-1417-2017, 2017. a
Garcia, R. R. and Boville, B. A.:
“Downward Control” of the Mean Meridional Circulation and Temperature Distribution of the Polar Winter Stratosphere,
J. Atmos. Sci.,
51, 2238–2245, https://doi.org/10.1175/1520-0469(1994)051<2238:COTMMC>2.0.CO;2, 1994. a
Garfinkel, C. I., Shaw, T. A., Hartmann, D. L., and Waugh, D. W.:
Does the Holton–Tan Mechanism Explain How the Quasi-Biennial Oscillation Modulates the Arctic Polar Vortex?,
J. Atmos. Sci.,
69, 1713–1733, https://doi.org/10.1175/JAS-D-11-0209.1, 2012. a
Garfinkel, C. I., Aquila, V., Waugh, D. W., and Oman, L. D.: Time-varying changes in the simulated structure of the Brewer–Dobson Circulation, Atmos. Chem. Phys., 17, 1313–1327, https://doi.org/10.5194/acp-17-1313-2017, 2017. a, b
Garny, H., Dameris, M., Randel, W., Bodeker, G. E., and Deckert, R.:
Dynamically forced increase of tropical upwelling in the lower stratosphere,
J. Atmos. Sci.,
68, 1214–1233, https://doi.org/10.1175/2011JAS3701.1, 2011. a, b, c
Garny, H., Birner, T., Bönisch, H., and Bunzel, F.:
The effects of mixing on age of air,
J. Geophys. Res.-Atmos.,
119, 7015–7034, https://doi.org/10.1002/2013JD021417, 2014. a, b
Geller, M. A., Zhou, T., Shindell, D., Ruedy, R., Aleinov, I., Nazarenko, L., Tausnev, N. L., Kelley, M., Sun, S., Cheng, Y., Field, R. D., and Faluvegi, G.:
Modeling the QBO–Improvements resulting from higher-model vertical resolution,
J. Adv. Model. Earth Sy.,
8, 1092–1105, https://doi.org/10.1002/2016MS000699, 2016. a
Haenel, F. J., Stiller, G. P., von Clarmann, T., Funke, B., Eckert, E., Glatthor, N., Grabowski, U., Kellmann, S., Kiefer, M., Linden, A., and Reddmann, T.: Reassessment of MIPAS age of air trends and variability, Atmos. Chem. Phys., 15, 13161–13176, https://doi.org/10.5194/acp-15-13161-2015, 2015. a
Hamilton, K.:
Effects of an Imposed Quasi-Biennial Oscillation in a Comprehensive Troposphere–Stratosphere–Mesosphere General Circulation Model,
J. Atmos. Sci.,
55, 2393–2418, https://doi.org/10.1175/1520-0469(1998)055<2393:EOAIQB>2.0.CO;2, 1998. a
Hegglin, M. I. and Shepherd, T. G.:
Large climate–induced changes in ultraviolet index and stratosphere–to–troposphere ozone flux,
Nat. Geosci.,
2, 687–691, https://doi.org/10.1038/ngeo604, 2009. a
Hegglin, M. I., Plummer, D. A., Shepherd, T. G., Scinocca, J. F., Anderson, J., Froidevaux, L., Funke, B., Hurst, D., Rozanov, A., Urban, J., von Clarmann, T., Walker, K. A., Wang, H. J., Tegtmeier, S., and Weigel, K.:
Vertical structure of stratospheric water vapour trends derived from merged satellite data,
Nat. Geosci.,
7, 768–776, https://doi.org/10.1038/ngeo2236, 2014. 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., De Chiara, G., 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, b, c, d, e
Hoffmann, L., Günther, G., Li, D., Stein, O., Wu, X., Griessbach, S., Heng, Y., Konopka, P., Müller, R., Vogel, B., and Wright, J. S.: From ERA-Interim to ERA5: the considerable impact of ECMWF's next-generation reanalysis on Lagrangian transport simulations, Atmos. Chem. Phys., 19, 3097–3124, https://doi.org/10.5194/acp-19-3097-2019, 2019. a, b
Holton, J. R.:
Meridional Distribution of Stratospheric Trace Constituents,
J. Atmos. Sci.,
43, 1238–1242, https://doi.org/10.1175/1520-0469(1986)043<1238:MDOSTC>2.0.CO;2, 1986. a, b
Holton, J. R.:
On the global exchange of mass between the stratosphere and troposphere,
J. Atmos. Sci.,
47, 651–678, 1990. a
Holton, J. R. and Lindzen, R. S.:
An Updated Theory for the Quasi-Biennial Cycle of the Tropical Stratosphere,
J. Atmos. Sci.,
29, 1076–1080, https://doi.org/10.1175/1520-0469(1972)029<1076:AUTFTQ>2.0.CO;2, 1972. a
Holton, J. R. and Tan, H.-C.:
The Influence of the Equatorial Quasi-Biennial Oscillation on the Global Circulation at 50 mb,
J. Atmos. Sci.,
37, 2200–2208, https://doi.org/10.1175/1520-0469(1980)037<2200:TIOTEQ>2.0.CO;2, 1980. a
Holton, J. R., Haynes, P. H., McIntyre, M. E., Douglass, A. R., Rood, R. B., and Pfister, L.:
Stratosphere-troposphere exchange,
Rev. Geophys.,
33, 403–440, https://doi.org/10.1029/95RG02097, 1995. a, b, c, d
Kawatani, Y. and Hamilton, K.:
Weakened stratospheric quasibiennial oscillation driven by increased tropical mean upwelling,
Nature,
497, 478–481, https://doi.org/10.1038/nature12140, 2013. a
Konopka, P., Ploeger, F., Tao, M., and Riese, M.:
Zonally resolved impact of ENSO on the stratospheric circulation and water vapor entry values,
J. Geophys. Res.-Atmos.,
121, 11486–11501, https://doi.org/10.1002/2015JD024698, 2016. a, b
Lacis, A. A., Chowdhary, J., Mishchenko, M. I., and Cairns, B.:
Modeling errors in diffuse-sky radiation: Vector vs scalar treatment,
Geophys. Res. Lett.,
25, 135–138, https://doi.org/10.1029/97GL03613, 1998. a
Latif, M. and Keenlyside, N. S.:
El Niño/Southern Oscillation response to global warming,
P. Natl. Acad. Sci. USA,
106, 20578–20583, https://doi.org/10.1073/pnas.0710860105, 2009. a
Li, D., Vogel, B., Müller, R., Bian, J., Günther, G., Ploeger, F., Li, Q., Zhang, J., Bai, Z., Vömel, H., and Riese, M.: Dehydration and low ozone in the tropopause layer over the Asian monsoon caused by tropical cyclones: Lagrangian transport calculations using ERA-Interim and ERA5 reanalysis data, Atmos. Chem. Phys., 20, 4133–4152, https://doi.org/10.5194/acp-20-4133-2020, 2020. a
Li, F., Austin, J., and Wilson, J.:
The strength of the Brewer–Dobson Circulation in a changing climate: Coupled chemistry climate model simulations,
J. Climate,
21, 40, https://doi.org/10.1175/2007JCLI1663.1, 2008. a
Lin, P. and Fu, Q.:
Changes in various branches of the Brewer–Dobson circulation from an ensemble of chemistry climate models,
J. Geophys. Res.-Atmos.,
118, 73–84, https://doi.org/10.1029/2012JD018813, 2013. a, b, c, d
Lindzen, R. S. and Fox-Rabinovitz, M.:
Consistent Vertical and Horizontal Resolution,
Mon. Weather Rev.,
117, 2575–2583, https://doi.org/10.1175/1520-0493(1989)117<2575:CVAHR>2.0.CO;2, 1989. a
Lindzen, R. S. and Holton, J. R.:
A Theory of the Quasi-Biennial Oscillation,
J. Atmos. Sci.,
25, 1095–1107, https://doi.org/10.1175/1520-0469(1968)025<1095:ATOTQB>2.0.CO;2, 1968. a
Linz, M., Plumb, R. A., Gerber, E. P., Haenel, F. J., Stiller, G., Kinnison, D. E., Ming, A., and Neu, J. L.:
The strength of the meridional overturning circulation of the stratosphere,
Nat. Geosci.,
10, 663–667, https://doi.org/10.1038/ngeo3013, 2017. a, b, c, d
Lott, F., Guez, L., and Maury, P.:
A stochastic parameterization of non-orographic gravity waves: Formalism and impact on the equatorial stratosphere,
Geophys. Res. Lett.,
39, L06807, https://doi.org/10.1029/2012GL051001, 2012. a
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
McIntyre, M. E. and Palmer, T. N.:
The surf zone in the stratosphere,
J. Atmos. Terr. Phys.,
46, 825–849, https://doi.org/10.1016/0021-9169(84)90063-1, 1984. a, b
McLandress, C. and Shepherd, T. G.:
Simulated anthropogenic changes in the Brewer–Dobson Circulation, Including Its Extension to High Latitudes,
J. Climate,
22, 1516, https://doi.org/10.1175/2008JCLI2679.1, 2009. a
McLandress, C., Shepherd, T. G., Polavarapu, S., and Beagley, S. R.:
Is Missing Orographic Gravity Wave Drag near 60∘ S the Cause of the Stratospheric Zonal Wind Biases in Chemistry–Climate Models?,
J. Atmos. Sci.,
69, 802–818, https://doi.org/10.1175/JAS-D-11-0159.1, 2012. a, b
Miyazaki, K., Iwasaki, T., Kawatani, Y., Kobayashi, C., Sugawara, S., and Hegglin, M. I.: Inter-comparison of stratospheric mean-meridional circulation and eddy mixing among six reanalysis data sets, Atmos. Chem. Phys., 16, 6131–6152, https://doi.org/10.5194/acp-16-6131-2016, 2016. a, b, c
Monge-Sanz, B. M., Chipperfield, M. P., Dee, D. P., Simmons, A. J., and Uppala, S. M.:
Improvements in the stratospheric transport achieved by a chemistry transport model with ECMWF (re)analyses: identifying effects and remaining challenges,
Q. J. Roy. Meteor. Soc., 139, 654–673, https://doi.org/10.1002/qj.1996, 2012. a
Neu, J. L. and Plumb, R. A.:
Age of air in a “leaky pipe” model of stratospheric transport,
J. Geophys. Res.,
104, 19243–19255, https://doi.org/10.1029/1999JD900251, 1999. a
Neu, J. L., Flury, T., Manney, G. L., Santee, M. L., Livesey, N. J., and Worden, J.:
Tropospheric ozone variations governed by changes in stratospheric circulation,
Nat. Geosci.,
7, 340–344, https://doi.org/10.1038/ngeo2138, 2014. a
Newman, P. A. and Nash, E. R.:
Quantifying the wave driving of the stratosphere,
J. Geophys. Res.-Atmos.,
105, 12485–12497, https://doi.org/10.1029/1999JD901191, 2000. a, b
Newman, P. A., Coy, L., Pawson, S., and Lait, L. R.:
The anomalous change in the QBO in 2015–2016,
Geophys. Res. Lett.,
43, 8791–8797, https://doi.org/10.1002/2016GL070373, 2016. a
Niwano, M., Yamazaki, K., and Shiotani, M.:
Seasonal and QBO variations of ascent rate in the tropical lower stratosphere as inferred from UARS HALOE trace gas data,
J. Geophys. Res.,
108, 4794, https://doi.org/10.1029/2003JD003871, 4794, 2003. a, b, c
Oberländer-Hayn, S., Gerber, E. P., Abalichin, J., Akiyoshi, H., Kerschbaumer, A., Kubin, A., Kunze, M., Langematz, U., Meul, S., Michou, M., Morgenstern, O., and Oman, L. D.:
Is the Brewer–Dobson circulation increasing or moving upward?,
Geophys. Res. Lett.,
43, 1772–1779, https://doi.org/10.1002/2015GL067545, 2016. a
Osprey, S. M., Butchart, N., Knight, J. R., Scaife, A. A., Hamilton, K., Anstey, J. A., Schenzinger, V., and Zhang, C.:
An unexpected disruption of the atmospheric quasi-biennial oscillation,
Science,
353, 1424–1427, https://doi.org/10.1126/science.aah4156, 2016. a
Philander, S. G.:
El Niño, La Nina, and the Southern Oscillation,
vol. 46,
Academic Press, Cambridge Univ. Press, San Diego, CA, 1990. a
Ploeger, F., Konopka, P., Müller, R., Fueglistaler, S., Schmidt, T., Manners, J. C., Grooß, J.-U., Günther, G., Forster, P. M., and Riese, M.:
Horizontal transport affecting trace gas seasonality in the Tropical Tropopause Layer (TTL),
J. Geophys. Res.,
117, D09303, https://doi.org/10.1029/2011JD017267, 2012. a, b
Ploeger, F., Abalos, M., Birner, T., Konopka, P., Legras, B., Müller, R., and Riese, M.:
Quantifying the effects of mixing and residual circulation on trends of stratospheric mean age of air,
Geophys. Res. Lett.,
42, 2047–2054, https://doi.org/10.1002/2014GL062927, 2015a. a, b, c
Ploeger, F., Riese, M., Haenel, F., Konopka, P., Müller, R., and Stiller, G.:
Variability of stratospheric mean age of air and of the local effects of residual circulation and eddy mixing,
J. Geophys. Res.-Atmos.,
120, 716–733, https://doi.org/10.1002/2014JD022468, 2015b. a, b, c
Ploeger, F., Legras, B., Charlesworth, E., Yan, X., Diallo, M., Konopka, P., Birner, T., Tao, M., Engel, A., and Riese, M.: How robust are stratospheric age of air trends from different reanalyses?, Atmos. Chem. Phys., 19, 6085–6105, https://doi.org/10.5194/acp-19-6085-2019, 2019. a, b, c, d
Ploeger, F., Diallo, M., Charlesworth, E., Konopka, P., Legras, B., Laube, J. C., Grooß, J.-U., Günther, G., Engel, A., and Riese, M.: The stratospheric Brewer–Dobson circulation inferred from age of air in the ERA5 reanalysis, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-1253, in review, 2021. a, b, c
Plumb, R. A.:
The Interaction of Two Internal Waves with the Mean Flow: Implications for the Theory of the Quasi-Biennial Oscillation,
J. Atmos. Sci.,
34, 1847–1858, https://doi.org/10.1175/1520-0469(1977)034<1847:TIOTIW>2.0.CO;2, 1977. a
Plumb, R. A. and Eluszkiewicz, P.:
The Brewer–Dobson circulation: dynamics of the tropical upwelling,
J. Atmos. Sci.,
56, 868–890, 1999. a
Polichtchouk, I., Hogan, R., Shepherd, T. G., Bechtold, P., Stockdale, T., Malardel, S., Lock, S.-J., and Magnusson, L.:
What influences the middle atmosphere circulation in the IFS?,
European Centre for Medium-Range Weather Forecasts, ECMWF Technical Memoranda
Shinfield Park, Reading, RG2 9AX, England, https://doi.org/10.21957/mfsnfv15o, 2017. a
Polichtchouk, I., Shepherd, T. G., Hogan, R. J., and Bechtold, P.:
Sensitivity of the Brewer–Dobson Circulation and Polar Vortex Variability to Parameterized Nonorographic Gravity Wave Drag in a High-Resolution Atmospheric Model,
J. Atmos. Sci.,
75, 1525–1543, https://doi.org/10.1175/JAS-D-17-0304.1, 2018. a, b
Polvani, L. M., Abalos, M., Garcia, R., Kinnison, D., and Randel, W. J.:
Significant Weakening of Brewer–Dobson Circulation Trends Over the 21st Century as a Consequence of the Montreal Protocol,
Geophys. Res. Lett.,
45, 401–409, https://doi.org/10.1002/2017GL075345, 2018. a, b, c, d
Punge, H. J., Konopka, P., Giorgetta, M. A., and Müller, R.:
Effect of the quasi-biennial oscillation on low-latitude transport in the stratosphere derived from trajectory calculations,
J. Geophys. Res.,
114, D03102, https://doi.org/10.1029/2008JD010518, 2009. a, b, c
Randel, W. J.:
The Evaluation of Winds from Geopotential Height Data in the Stratosphere,
J. Atmos. Sci.,
44, 3097–3120, https://doi.org/10.1175/1520-0469(1987)044<3097:TEOWFG>2.0.CO;2, 1987. a
Randel, W. J. and Wu, F.:
Isolation of the Ozone QBO in SAGE II Data by Singular-Value Decomposition,
J. Atmos. Sci.,
53, 2546–2559, https://doi.org/10.1175/1520-0469(1996)053<2546:IOTOQI>2.0.CO;2, 1996. a
Randel, W. J., Wu, F., Swinbank, R., Nash, J., and O'Neill, A.:
Global QBO Circulation Derived from UKMO Stratospheric Analyses,
J. Atmos. Sci.,
56, 457–474, https://doi.org/10.1175/1520-0469(1999)056<0457:GQCDFU>2.0.CO;2, 1999. a, b
Randel, W. J., Wu, F., and Gaffen, D. J.:
Interannual variability of the tropical tropopause derived from radiosonde data and NCEP reanalyses,
J. Geophys. Res.-Atmos.,
105, 15509–15523, https://doi.org/10.1029/2000JD900155, 2000. a
Randel, W. J., Garcia, R. R., and Wu, F.:
Time-Dependent Upwelling in the Tropical Lower Stratosphere Estimated from the Zonal-Mean Momentum Budget,
J. Atmos. Sci.,
59, 2141–2152, https://doi.org/10.1175/1520-0469(2002)059<2141:TDUITT>2.0.CO;2, 2002. a
Randel, W. J., Wu, F., Vömel, H., Nedoluha, G. E., and Forster, P.:
Decreases in stratospheric water vapor after 2001: Links to changes in the tropical tropopause and the Brewer–Dobson circulation,
J. Geophys. Res.,
111, 12312, https://doi.org/10.1029/2005JD006744, d12312, 2006. a
Randel, W. J., Garcia, R., and Wu, F.:
Dynamical Balances and Tropical Stratospheric Upwelling,
J. Atmos. Sci.,
65, 3584–3595, https://doi.org/10.1175/2008JAS2756.1, 2008. a
Randel, W. J., Garcia, R. R., Calvo, N., and Marsh, D.:
ENSO influence on zonal mean temperature and ozone in the tropical lower stratosphere,
Geophys. Res. Lett.,
39, L15822, https://doi.org/10.1029/2009GL039343, 2009. a, b
Ray, E. A., Moore, F. L., Rosenlof, K. H., Davis, S. M., Boenisch, H., Morgenstern, O., Smale, D., Rozanov, E., Hegglin, M., Pitari, G., Mancini, E., Braesicke, P., Butchart, N., Hardiman, S., Li, F., Shibata, K., and Plummer, D. A.:
Evidence for changes in stratospheric transport and mixing over the past three decades based on multiple data sets and tropical leaky pipe analysis,
J. Geophys. Res.,
115, D21304, https://doi.org/10.1029/2010JD014206, 2010. a, b
Ray, E. A., Moore, F. L., Rosenlof, K. H., Davis, S. M., Sweeney, C., Bönisch, H., Engel, A., Sugawara, S., Nakazawa, T., and Aoki, S.:
Improving stratospheric transport trend analysis based on SF6 and CO2 measurements,
J. Geophys. Res.,
119, 14110–14128, https://doi.org/10.1002/2014JD021802, 2014. a, b
Ray, E. A., Portmann, R. W., Yu, P. e. a., Daniel, J., Montzka, S. A., Dutton, G. S., Hall, B. D., Moore, F. L., and Rosenlof, K. H.:
The influence of the stratospheric Quasi-Biennial Oscillation on trace gas levels at the Earth's surface,
Nat. Geosci.,
13, 22–27, https://doi.org/10.1038/s41561-019-0507-3, 2020. a
Richter, J. H., Solomon, A., and Bacmeister, J. T.:
On the simulation of the quasi-biennial oscillation in the Community Atmosphere Model, version 5,
J. Geophys. Res.-Atmos.,
119, 3045–3062, https://doi.org/10.1002/2013JD021122, 2014. a
Riese, M., Ploeger, F., Rap, A., Vogel, B., Konopka, P., Dameris, M., and Forster, P.:
Impact of uncertainties in atmospheric mixing on simulated UTLS composition and related radiative effects,
J. Geophys. Res.,
117, D16305, https://doi.org/10.1029/2012JD017751, 2012. a
Santer, B., Wehner, M., Wigley, T., Sausen, R., Meehl, G., Taylor, K., Ammann, C., Arblaster, J., Washington, W., Boyle, J., and Brüggemann, W.:
Contributions of anthropogenic and natural forcing to recent tropopause height changes,
Science,
25, 479–483, https://doi.org/10.1126/science.1084123, 2003. a
Saravanan, R.:
A Multiwave Model of the Quasi-biennial Oscillation,
J. Atmos. Sci.,
47, 2465–2474, https://doi.org/10.1175/1520-0469(1990)047<2465:AMMOTQ>2.0.CO;2, 1990. a
Šácha, P., Eichinger, R., Garny, H., Pišoft, P., Dietmüller, S., de la Torre, L., Plummer, D. A., Jöckel, P., Morgenstern, O., Zeng, G., Butchart, N., and Añel, J. A.: Extratropical age of air trends and causative factors in climate projection simulations, Atmos. Chem. Phys., 19, 7627–7647, https://doi.org/10.5194/acp-19-7627-2019, 2019. a, b
Scaife, A. A., Butchart, N., Warner, C. D., and Swinbank, R.:
Impact of a Spectral Gravity Wave Parameterization on the Stratosphere in the Met Office Unified Model,
J. Atmos. Sci.,
59, 1473–1489, https://doi.org/10.1175/1520-0469(2002)059<1473:IOASGW>2.0.CO;2, 2002. a
Seidel, D. J. and Randel, W. J.:
Variability and trends in the global tropopause estimated from radiosonde data,
J. Geophys. Res.-Atmos.,
111, D21101, https://doi.org/10.1029/2006JD007363, 2006. a
Shepherd, T., Polichtchouk, I., Hogan, R., and Simmons, A. J.:
Report on Stratosphere Task Force,
European Centre for Medium-Range Weather Forecasts,
ECMWF Technical Memoranda
Shinfield Park, Reading, RG2 9AX, England, 824, https://doi.org/10.21957/0vkp0t1xx, 2018. a, b
Shepherd, T. G.:
Transport in the Middle Atmosphere,
J. Meteorol. Soc. Jpn. Ser. II,
85B, 165–191, https://doi.org/10.2151/jmsj.85B.165, 2007. a, b
Shepherd, T. G.:
Atmospheric circulation as a source of uncertainty in climate change projections,
Nat. Geosci.,
7, 703–708, https://doi.org/10.1038/ngeo2253, 2014. a
Shepherd, T. G. and McLandress, C.:
A Robust Mechanism for Strengthening of the Brewer–Dobson Circulation in Response to Climate Change: Critical-Layer Control of Subtropical Wave Breaking,
J. Atmos. Sci.,
68, 784–797, https://doi.org/10.1175/2010JAS3608.1, 2011. a, b, c
Shuckburgh, E. and Haynes, P. H.:
Diagnosed transport and mixing using a tracer-based coordinate system,
Phys. Fluids,
15, 3342–3357, https://doi.org/10.1063/1.1610471, 2003. a
Sigmond, M. and Shepherd, T. G.:
Compensation between Resolved Wave Driving and Parameterized Orographic Gravity Wave Driving of the Brewer–Dobson Circulation and Its Response to Climate Change,
J. Climate,
27, 5601–5610, https://doi.org/10.1175/JCLI-D-13-00644.1, 2014. a
Simmons, A., Soci, C., Nicolas, J., Bell, B., Berrisford, P., Dragani, R., Flemming, J., Haimberger, L., Healy, S., Hersbach, H., Horányi, A., Inness, A., Munoz-Sabater, J., Radu, R., and Schepers, D.:
Global stratospheric temperature bias and other stratospheric aspects of ERA5 and ERA5.1,
European Centre for Medium-Range Weather Forecasts,
ECMWF Technical Memoranda
Shinfield Park, Reading, RG2 9AX, England, 859, https://doi.org/10.21957/rcxqfmg0, 2020. a
Son, S.-W., Polvani, L. M., Waugh, D. W., Birner, T., Akiyoshi, H., Garcia, R. R., Gettelman, A., Plummer, D. A., and Rozanov, E.:
The Impact of Stratospheric Ozone Recovery on Tropopause Height Trends,
J. Climate,
22, 429–445, https://doi.org/10.1175/2008JCLI2215.1, 2009. a
Stiller, G. P., von Clarmann, T., Haenel, F., Funke, B., Glatthor, N., Grabowski, U., Kellmann, S., Kiefer, M., Linden, A., Lossow, S., and López-Puertas, M.: Observed temporal evolution of global mean age of stratospheric air for the 2002 to 2010 period, Atmos. Chem. Phys., 12, 3311–3331, https://doi.org/10.5194/acp-12-3311-2012, 2012. a
Tao, M., Konopka, P., Ploeger, F., Yan, X., Wright, J. S., Diallo, M., Fueglistaler, S., and Riese, M.: Multitimescale variations in modeled stratospheric water vapor derived from three modern reanalysis products, Atmos. Chem. Phys., 19, 6509–6534, https://doi.org/10.5194/acp-19-6509-2019, 2019. a, b
Tegtmeier, S., Anstey, J., Davis, S., Dragani, R., Harada, Y., Ivanciu, I., Pilch Kedzierski, R., Krüger, K., Legras, B., Long, C., Wang, J. S., Wargan, K., and Wright, J. S.: Temperature and tropopause characteristics from reanalyses data in the tropical tropopause layer, Atmos. Chem. Phys., 20, 753–770, https://doi.org/10.5194/acp-20-753-2020, 2020. a
Thompson, D. W. J. and Solomon, S.:
Recent stratospheric climat trends as evidence inradiosonde data: Global structure and tropospheric linkages,
J. Climate,
18, 4785–4795, https://doi.org/10.1175/JCLI3585.1, 2005. a, b
Thompson, D. W. J. and Solomon, S.:
Understanding recent stratospheric climate change,
J. Climate,
22, 1934, https://doi.org/10.1175/2008JCLI2482.1, 2009. a
Trepte, C. R. and Hitchman, M. H.:
Tropical stratospheric circulation deduced from satellite aerosol data,
Nat. Geosci.,
355, 626–628, https://doi.org/10.1038/355626a0, 1992. a, b, c
Vallis, G. K., Zurita-Gotor, P., Cairns, C., and Kidston, J.:
Response of the large-scale structure of the atmosphere to global warming,
Q. J. Roy. Meteor. Soc.,
141, 1479–1501, https://doi.org/10.1002/qj.2456, 2015. a
van Oldenborgh, G. J., Philip, S. Y., and Collins, M.: El Niño in a changing climate: a multi-model study, Ocean Sci., 1, 81–95, https://doi.org/10.5194/os-1-81-2005, 2005. a
Wallace, J. M., Panetta, R. L., and Estberg, J.:
Representation of the Equatorial Stratospheric Quasi-Biennial Oscillation in EOF Phase Space,
J. Atmos. Sci.,
50, 1751–1762, https://doi.org/10.1175/1520-0469(1993)050<1751:ROTESQ>2.0.CO;2, 1993. a
Wang, C., Deser, Y. J.-Y., DiNezio, P., and Clement, A.:
El Niño–Southern Oscillation (ENSO): A review,
in: Reefs of the Eastern Pacific,
Springer Sci. Publish., 85–106, 2016. a
Warner, C. D. and McIntyre, M. E.:
An Ultrasimple Spectral Parameterization for Nonorographic Gravity Waves,
J. Atmos. Sci.,
58, 1837–1857, https://doi.org/10.1175/1520-0469(2001)058<1837:AUSPFN>2.0.CO;2, 2001. a, b
Waugh, D. and Hall, T.:
Age of stratospheric air: Theory, observations, and models,
Rev. Geophys.,
40, 1010, https://doi.org/10.1029/2000RG000101, 2002. a
WMO:
Scientific Assessment of Ozone Depletion: 2018, Global ozone research and monitoring project – report no. 58,
WMO (World Meteorological Organization), Geneva, Switzerland, 2018. a
Wolter, K. and Timlin, M. S.:
El Nino/Southern Oscillation behaviour since 1871 as diagnosed in an extended multivariate ENSO index (MEI.ext),
Int. J. Climatol.,
31, 1074–1087, https://doi.org/10.1002/joc.2336, 2011. a
Yang, H., Chen, G., and Domeisen, D. I. V.:
Sensitivities of the Lower-Stratospheric Transport and Mixing to Tropical SST Heating,
J. Atmos. Sci.,
71, 2674–2694, https://doi.org/10.1175/JAS-D-13-0276.1, 2014. a
Zwiers, F. W. and von Storch, H.:
Taking Serial Correlation into Account in Tests of the Mean,
J. Climate,
8, 336–351, https://doi.org/10.1175/1520-0442(1995)008<0336:TSCIAI>2.0.CO;2, 1995. a
Short summary
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.
Despite good agreement in the spatial structure, there are substantial differences in the...
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