Articles | Volume 22, issue 12
https://doi.org/10.5194/acp-22-8321-2022
© 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-22-8321-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Jun 2022
Research article |
| 28 Jun 2022
| 28 Jun 2022
Temporal and vertical distributions of the occurrence of cirrus clouds over a coastal station in the Indian monsoon region
Saleem Ali
Atmospheric Observations and Modelling Laboratory, Research
Institute/Department of Physics, SRM Institute of Science and Technology,
Kattankulathur, Tamil Nadu, India
Sanjay Kumar Mehta
CORRESPONDING AUTHOR
Atmospheric Observations and Modelling Laboratory, Research
Institute/Department of Physics, SRM Institute of Science and Technology,
Kattankulathur, Tamil Nadu, India
Aravindhavel Ananthavel
Atmospheric Observations and Modelling Laboratory, Research
Institute/Department of Physics, SRM Institute of Science and Technology,
Kattankulathur, Tamil Nadu, India
Indian Institute of Tropical Meteorology, Pune, India
Tondapu Venkata Ramesh Reddy
Atmospheric Observations and Modelling Laboratory, Research
Institute/Department of Physics, SRM Institute of Science and Technology,
Kattankulathur, Tamil Nadu, India
Department of Civil Engineering, Indian Institute of Technology
Kanpur, Kanpur, India
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Saleem Ali, Chandan Sarangi, and Sanjay Kumar Mehta
Atmos. Chem. Phys., 25, 8769–8783, https://doi.org/10.5194/acp-25-8769-2025, https://doi.org/10.5194/acp-25-8769-2025, 2025
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The pollutants over northern India are transported towards southern India under the influence of the prevalent wind system, especially during the winter season. This long-range transport induces widespread haziness over southern India, lasting for days. We evaluated the occurrence of such transport episodes over southern India using observational methods and found that it suppresses the boundary layer height by approximately 40 % compared to clear days, while exacerbating the surface pollution by approximately 50 %–60 %.
Saleem Ali, Chandan Sarangi, and Sanjay Kumar Mehta
Atmos. Chem. Phys., 25, 8769–8783, https://doi.org/10.5194/acp-25-8769-2025, https://doi.org/10.5194/acp-25-8769-2025, 2025
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The pollutants over northern India are transported towards southern India under the influence of the prevalent wind system, especially during the winter season. This long-range transport induces widespread haziness over southern India, lasting for days. We evaluated the occurrence of such transport episodes over southern India using observational methods and found that it suppresses the boundary layer height by approximately 40 % compared to clear days, while exacerbating the surface pollution by approximately 50 %–60 %.
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Atmos. Chem. Phys., 15, 13507–13518, https://doi.org/10.5194/acp-15-13507-2015, https://doi.org/10.5194/acp-15-13507-2015, 2015
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This paper evaluates the temperature response in the troposphere and the stratosphere to the three major volcanic eruptions between the 1960s and the 1990s by comparing nine reanalysis data sets. It was found that the volcanic temperature response patterns differ among the major eruptions and that in general, more recent reanalysis data sets show a more consistent response pattern.
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Subject: Clouds and Precipitation | Research Activity: Field Measurements | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
Moisture budget estimates derived from airborne observations in an Arctic atmospheric river during its dissipation
Aerosol–cloud interactions in cirrus clouds based on global-scale airborne observations and machine learning models
In-cloud characteristics observed in northeastern and midwestern US non-orographic winter storms with implications for ice particle mass growth and residence time
Vertical profiles of liquid water content in fog layers during the SOFOG3D experiment
Quantified ice-nucleating ability of AgI-containing seeding particles in natural clouds
Measurement report: A survey of meteorological and cloud properties during ACTIVATE’s postfrontal flights and their suitability for Lagrangian case studies
Quantifying the impact of solar zenith angle, cloud optical thickness, and surface albedo on the solar radiative effect of Arctic low-level clouds over open ocean and sea ice
Characterization of fog microphysics and their relationships with visibility at a mountain site in China
Quantifying ice crystal growth rates in natural clouds from glaciogenic cloud seeding experiments
Measurement report: Microphysical and optical characteristic of radiation fog – a study using in-situ, remote sensing, and balloon techniques
Hunting for gravity waves in non-orographic winter storms using 3+ years of regional surface air pressure network and radar observations
Theoretical framework for measuring cloud effective supersaturation fluctuations with an advanced optical system
Airborne observations of cloud properties during their evolution from organized streets to isotropic cloud structures along an Arctic cold air outbreak
Synthesis of surface snowfall rates and radar-observed storm structures in 10+ years of Northeast US winter storms
Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon
How does riming influence the observed spatial variability of ice water in mixed-phase clouds?
Microphysical view of the development and ice production of mid-latitude stratiform clouds with embedded convection during an extratropical cyclone
Clouds and precipitation in the initial phase of marine cold-air outbreaks as observed by airborne remote sensing
Light scattering and microphysical properties of atmospheric bullet rosette ice crystals
Estimating the snow density using collocated Parsivel and Micro-Rain Radar measurements: a preliminary study from ICE-POP 2017/2018
Technical note: On the ice microphysics of isolated thunderstorms and non-thunderstorms in southern China – a radar polarimetric perspective
Distinctive aerosol–cloud–precipitation interactions in marine boundary layer clouds from the ACE-ENA and SOCRATES aircraft field campaigns
Drivers of droplet formation in east Mediterranean orographic clouds
Observed impacts of aerosol concentration on maritime tropical convection within constrained environments using airborne radiometer, radar, lidar, and dropsondes
Causal Analysis of Aerosol Impacts on Isolated Deep Convection: Findings from TRACER
Observability of moisture transport divergence in Arctic atmospheric rivers by dropsondes
Elucidating the boundary layer turbulence dissipation rate using high-resolution measurements from a radar wind profiler network over the Tibetan Plateau
Environmental controls on isolated convection during the Amazonian wet season
Isotopic composition of convective rainfall in the inland tropics of Brazil
Measurement report: Cloud and environmental properties associated with aggregated shallow marine cumulus and cumulus congestus
Lifecycle of updrafts and mass flux in isolated deep convection over the Amazon rainforest: insights from cell tracking
Thermodynamic and cloud evolution in a cold-air outbreak during HALO-(AC)3: quasi-Lagrangian observations compared to the ERA5 and CARRA reanalyses
Powering aircraft with 100 % sustainable aviation fuel reduces ice crystals in contrails
Supercooled liquid water clouds observed over Dome C, Antarctica: temperature sensitivity and cloud radiative forcing
Role of thermodynamic and turbulence processes on the fog life cycle during SOFOG3D experiment
Characterizing the near-global cloud vertical structures over land using high-resolution radiosonde measurements
Differences in microphysical properties of cirrus at high and mid-latitudes
Sub-cloud rain evaporation in the North Atlantic winter trade winds derived by pairing isotopic data with a bin-resolved microphysical model
Overview and statistical analysis of boundary layer clouds and precipitation over the western North Atlantic Ocean
A set of methods to evaluate the below-cloud evaporation effect on local precipitation isotopic composition: a case study for Xi'an, China
Earth-system-model evaluation of cloud and precipitation occurrence for supercooled and warm clouds over the Southern Ocean's Macquarie Island
Pollution slightly enhances atmospheric cooling by low-level clouds in tropical West Africa
Investigating an indirect aviation effect on mid-latitude cirrus clouds – linking lidar-derived optical properties to in situ measurements
Investigating the vertical extent and short-wave radiative effects of the ice phase in Arctic summertime low-level clouds
Microphysical and thermodynamic phase analyses of Arctic low-level clouds measured above the sea ice and the open ocean in spring and summer
Aircraft observations of gravity wave activity and turbulence in the tropical tropopause layer: prevalence, influence on cirrus clouds, and comparison with global storm-resolving models
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Examination of aerosol indirect effects during cirrus cloud evolution
Henning Dorff, Florian Ewald, Heike Konow, Mario Mech, Davide Ori, Vera Schemann, Andreas Walbröl, Manfred Wendisch, and Felix Ament
Atmos. Chem. Phys., 25, 8329–8354, https://doi.org/10.5194/acp-25-8329-2025, https://doi.org/10.5194/acp-25-8329-2025, 2025
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Using observations of an Arctic atmospheric river (AR) from a long-range research aircraft, we analyse how moisture transported into the Arctic by the AR is transformed and how it interacts with the Arctic environment. The moisture transport divergence is the main driver of local moisture change over time. Surface precipitation and evaporation are rather weak when averaged over extended AR sectors, although considerable heterogeneity of precipitation within the AR is observed.
Derek Ngo, Minghui Diao, Ryan J. Patnaude, Sarah Woods, and Glenn Diskin
Atmos. Chem. Phys., 25, 7007–7036, https://doi.org/10.5194/acp-25-7007-2025, https://doi.org/10.5194/acp-25-7007-2025, 2025
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Key controlling factors of cirrus clouds were individually quantified using machine learning models based on global-scale in situ observations from 12 campaigns at 67° S–87° N. Relative humidity shows much larger effects on cirrus occurrences and ice water content (IWC) fluctuations than vertical velocity. Aerosol–cloud interactions are seen for both large and small aerosols, with higher IWC and ice crystal number concentration under higher aerosol concentrations. Large aerosols are more impactful than small aerosols.
Luke R. Allen, Sandra E. Yuter, Declan M. Crowe, Matthew A. Miller, and K. Lee Thornhill
Atmos. Chem. Phys., 25, 6679–6701, https://doi.org/10.5194/acp-25-6679-2025, https://doi.org/10.5194/acp-25-6679-2025, 2025
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We analyzed in-cloud characteristics using in situ measurements from 42 research flights across two field campaigns into non-orographic, non-lake-effect winter storms. Much of the storm volume contains weak vertical motions (a few centimeters per second), and most updrafts ≥ 0.5 m s-1 are small (< 1 km). Within 2 km of cloud radar echo top, stronger vertical motions and conditions for ice particle growth are more common. Overturning air motions near cloud top appear important for the production of snow particles.
Théophane Costabloz, Frédéric Burnet, Christine Lac, Pauline Martinet, Julien Delanoë, Susana Jorquera, and Maroua Fathalli
Atmos. Chem. Phys., 25, 6539–6573, https://doi.org/10.5194/acp-25-6539-2025, https://doi.org/10.5194/acp-25-6539-2025, 2025
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This study documents vertical profiles of liquid water content (LWC) in fogs from in situ measurements collected during the SOFOG3D field campaign in 2019–2020. The analysis of 140 vertical profiles reveals a reverse trend in LWC, maximum values at ground decreasing with height, during stable conditions in optically thin fogs, evolving towards quasi-adiabatic characteristics when fogs become thick. These results offer new perspectives for better constraining fog numerical simulations.
Anna J. Miller, Christopher Fuchs, Fabiola Ramelli, Huiying Zhang, Nadja Omanovic, Robert Spirig, Claudia Marcolli, Zamin A. Kanji, Ulrike Lohmann, and Jan Henneberger
Atmos. Chem. Phys., 25, 5387–5407, https://doi.org/10.5194/acp-25-5387-2025, https://doi.org/10.5194/acp-25-5387-2025, 2025
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We analyzed the ability of silver iodide particles (a commonly used cloud-seeding agent) to form ice crystals in naturally occurring liquid clouds at −5 to −8 °C and found that only ≈ 0.1 %−1 % of particles nucleate ice, with a negative dependence on temperature. By contextualizing our results with previous laboratory studies, we help to bridge the gap between laboratory and field experiments, which also helps to inform future cloud-seeding projects.
Florian Tornow, Ann Fridlind, George Tselioudis, Brian Cairns, Andrew Ackerman, Seethala Chellappan, David Painemal, Paquita Zuidema, Christiane Voigt, Simon Kirschler, and Armin Sorooshian
Atmos. Chem. Phys., 25, 5053–5074, https://doi.org/10.5194/acp-25-5053-2025, https://doi.org/10.5194/acp-25-5053-2025, 2025
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The recent NASA campaign ACTIVATE (Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment) performed 71 tandem flights in mid-latitude marine cold-air outbreaks off the US eastern seaboard. We provide meteorological and cloud transition stage context, allowing us to identify days that are most suitable for Lagrangian modeling and analysis. Surveyed cloud properties show signatures of cloud microphysical processes, such as cloud-top entrainment and secondary ice formation.
Sebastian Becker, André Ehrlich, Michael Schäfer, and Manfred Wendisch
EGUsphere, https://doi.org/10.5194/egusphere-2025-1210, https://doi.org/10.5194/egusphere-2025-1210, 2025
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Clouds interact with solar radiation and can alter the surface temperature. The strength of this cloud impact is driven by cloud properties as well as solar elevation and surface reflection. Since these dependences are poorly represented in climate models, cloud, surface, and radiation observations are used to quantify the contributions of the drivers in the Arctic. It is shown that the weaker surface reflection dominates the stronger cooling effect of clouds over open ocean compared to sea ice.
Quan Liu, Xiaojing Shen, Junying Sun, Yangmei Zhang, Bing Qi, Qianli Ma, Lujie Han, Honghui Xu, Xinyao Hu, Jiayuan Lu, Shuo Liu, Aoyuan Yu, Linlin Liang, Qian Gao, Hong Wang, Huizheng Che, and Xiaoye Zhang
Atmos. Chem. Phys., 25, 3253–3267, https://doi.org/10.5194/acp-25-3253-2025, https://doi.org/10.5194/acp-25-3253-2025, 2025
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Through simultaneous measurements of aerosol particles and fog droplets, the evolution of droplets size distribution during the eight observed fog events was investigated. The results showed that the concentration and size distribution of pre-fog aerosol had significant impacts on fog microphysical characteristics. The extinction of fog interstitial particles played an important role in visibility degradation for light fogs, especially in polluted regions.
Christopher Fuchs, Fabiola Ramelli, Anna J. Miller, Nadja Omanovic, Robert Spirig, Huiying Zhang, Patric Seifert, Kevin Ohneiser, Ulrike Lohmann, and Jan Henneberger
EGUsphere, https://doi.org/10.5194/egusphere-2025-688, https://doi.org/10.5194/egusphere-2025-688, 2025
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We quantify diffusional ice crystal growth in natural clouds using cloud seeding experiments. We report growth rates for 14 experiments between -5.1°C and -8.3°C and observe strong variations depending on the cloud characteristics. Comparing our growth rates to laboratory data, we found similar temperature-dependent trends, but the laboratory rates are higher. This data fills the gap in quantitative in situ observation of ice crystal growth, helping to validate models and laboratory experiments.
Katarzyna Nurowska, Przemysław Makuch, and Krzysztof M. Markowicz
EGUsphere, https://doi.org/10.5194/egusphere-2024-4074, https://doi.org/10.5194/egusphere-2024-4074, 2025
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This study explores the properties of radiation fog in Southeastern Poland, focusing on how droplets and water content vary with height. Data from three September 2023 fog events show that larger droplets form near the ground, while fog dissipates from both top and bottom. Key findings include average droplet sizes, water content, and how fog impacts radiation. The results improve understanding of fog behavior and its environmental effects.
Luke R. Allen, Sandra E. Yuter, Matthew A. Miller, and Laura M. Tomkins
Atmos. Chem. Phys., 25, 1765–1790, https://doi.org/10.5194/acp-25-1765-2025, https://doi.org/10.5194/acp-25-1765-2025, 2025
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Atmospheric gravity waves (GWs) are air oscillations in which buoyancy is the restoring force, and they may enhance precipitation under certain conditions. We used 3+ seasons of pressure data to identify GWs with wavelengths ≤ 170 km in the Toronto and New York metropolitan areas in the context of snow storms. We found only six GW events during snow storms, suggesting that GWs on those scales are uncommon at the two locations during snow storms and, thus, do not often enhance snowfall.
Ye Kuang, Jiangchuan Tao, Hanbing Xu, Li Liu, Pengfei Liu, Wanyun Xu, Weiqi Xu, Yele Sun, and Chunsheng Zhao
Atmos. Chem. Phys., 25, 1163–1174, https://doi.org/10.5194/acp-25-1163-2025, https://doi.org/10.5194/acp-25-1163-2025, 2025
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This study presents a novel optical framework to measure supersaturation, a fundamental parameter in cloud physics, by observing the scattering properties of particles that have or have not grown into cloud droplets. The technique offers high-resolution measurements, capturing essential fluctuations in supersaturation necessary for understanding cloud physics.
Marcus Klingebiel, André Ehrlich, Micha Gryschka, Nils Risse, Nina Maherndl, Imke Schirmacher, Sophie Rosenburg, Sabine Hörnig, Manuel Moser, Evelyn Jäkel, Michael Schäfer, Hartwig Deneke, Mario Mech, Christiane Voigt, and Manfred Wendisch
EGUsphere, https://doi.org/10.5194/egusphere-2025-201, https://doi.org/10.5194/egusphere-2025-201, 2025
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Our study is using aircraft measurements from the HALO-(𝒜𝒞)³ campaign to investigate the transition from organized Arctic cloud street structures to more scattered cloud shapes. We show that lower wind speeds cause this transition. In addition we look at the changes of the cloud coverage, the height of the clouds, the cloud particles and the radiative properties.
Laura M. Tomkins, Sandra E. Yuter, Matthew A. Miller, Mariko Oue, and Charles N. Helms
EGUsphere, https://doi.org/10.5194/egusphere-2025-6, https://doi.org/10.5194/egusphere-2025-6, 2025
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This study investigates how radar-detected snow bands relate to snowfall rates during winter storms in the northeastern U.S. Using over a decade of data, we found that snow bands are not consistently linked to heavy snowfall at the surface, as snow particles are often dispersed by wind before reaching the ground. These findings highlight limitations of using radar reflectivity for predicting snow rates and suggest focusing on radar echo duration to better understand snowfall patterns.
Amit Kumar Pandit, Jean-Paul Vernier, Thomas Duncan Fairlie, Kristopher M. Bedka, Melody A. Avery, Harish Gadhavi, Madineni Venkat Ratnam, Sanjeev Dwivedi, Kasimahanthi Amar Jyothi, Frank G. Wienhold, Holger Vömel, Hongyu Liu, Bo Zhang, Buduru Suneel Kumar, Tra Dinh, and Achuthan Jayaraman
Atmos. Chem. Phys., 24, 14209–14238, https://doi.org/10.5194/acp-24-14209-2024, https://doi.org/10.5194/acp-24-14209-2024, 2024
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This study investigates the formation mechanism of a tropopause cirrus cloud layer observed at extremely cold temperatures over Hyderabad in India during the 2017 Asian summer monsoon using balloon-borne sensors. Ice crystals smaller than 50 µm were found in this optically thin cirrus cloud layer. Combined analysis of back trajectories, satellite, and model data revealed that the formation of this layer was influenced by waves and stratospheric hydration induced by typhoon Hato.
Nina Maherndl, Manuel Moser, Imke Schirmacher, Aaron Bansemer, Johannes Lucke, Christiane Voigt, and Maximilian Maahn
Atmos. Chem. Phys., 24, 13935–13960, https://doi.org/10.5194/acp-24-13935-2024, https://doi.org/10.5194/acp-24-13935-2024, 2024
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It is not clear why ice crystals in clouds occur in clusters. Here, airborne measurements of clouds in mid-latitudes and high latitudes are used to study the spatial variability of ice. Further, we investigate the influence of riming, which occurs when liquid droplets freeze onto ice crystals. We find that riming enhances the occurrence of ice clusters. In the Arctic, riming leads to ice clustering at spatial scales of 3–5 km. This is due to updrafts and not higher amounts of liquid water.
Yuanmou Du, Dantong Liu, Delong Zhao, Mengyu Huang, Ping Tian, Dian Wen, Wei Xiao, Wei Zhou, Hui He, Baiwan Pan, Dongfei Zuo, Xiange Liu, Yingying Jing, Rong Zhang, Jiujiang Sheng, Fei Wang, Yu Huang, Yunbo Chen, and Deping Ding
Atmos. Chem. Phys., 24, 13429–13444, https://doi.org/10.5194/acp-24-13429-2024, https://doi.org/10.5194/acp-24-13429-2024, 2024
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By conducting in situ measurements, we investigated ice production processes in stratiform clouds with embedded convection over the North China Plain. The results show that the ice number concentration is strongly related to the distance to the cloud top, and the level with a larger distance to the cloud top has more graupel falling from upper levels, which promotes collision and coalescence between graupel and droplets and enhances secondary ice production.
Imke Schirmacher, Sabrina Schnitt, Marcus Klingebiel, Nina Maherndl, Benjamin Kirbus, André Ehrlich, Mario Mech, and Susanne Crewell
Atmos. Chem. Phys., 24, 12823–12842, https://doi.org/10.5194/acp-24-12823-2024, https://doi.org/10.5194/acp-24-12823-2024, 2024
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During Arctic marine cold-air outbreaks, cold air flows from sea ice over open water. Roll circulations evolve, forming cloud streets. We investigate the initial circulation and cloud development using high-resolution airborne measurements. We compute the distance an air mass traveled over water (fetch) from back trajectories. Cloud streets form at 15 km fetch, cloud cover strongly increases at around 20 km, and precipitation forms at around 30 km.
Shawn Wendell Wagner, Martin Schnaiter, Guanglang Xu, Franziska Nehlert, and Emma Järvinen
EGUsphere, https://doi.org/10.5194/egusphere-2024-3316, https://doi.org/10.5194/egusphere-2024-3316, 2024
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Understanding the interaction between cirrus clouds and solar radiation is critical for modeling the Earth’s climate. A common crystal type found in cirrus clouds is the bullet rosette. Here, atmospheric bullet rosettes measured from jet aircraft are analyzed for their morphological and radiative properties. Atmospheric bullet rosettes are found to be more morphologically complex than previously assumed. This complexity has a significant impact on their radiative properties.
Wei-Yu Chang, Yung-Chuan Yang, Chen-Yu Hung, Kwonil Kim, Gyuwon Lee, and Ali Tokay
Atmos. Chem. Phys., 24, 11955–11979, https://doi.org/10.5194/acp-24-11955-2024, https://doi.org/10.5194/acp-24-11955-2024, 2024
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Snow density is derived by collocated Micro-Rain Radar (MRR) and Parsivel (ICE-POP 2017/2018). We apply the particle size distribution from Parsivel to a T-matrix backscattering simulation and compare with ZHH from MRR. Bulk density and bulk water fractions are derived from comparing simulated and calculated ZHH. Retrieved bulk density is validated by comparing snowfall rate measurements from Pluvio and the Precipitation Imaging Package. Snowfall rate consistency confirms the algorithm.
Chuanhong Zhao, Yijun Zhang, Dong Zheng, Haoran Li, Sai Du, Xueyan Peng, Xiantong Liu, Pengguo Zhao, Jiafeng Zheng, and Juan Shi
Atmos. Chem. Phys., 24, 11637–11651, https://doi.org/10.5194/acp-24-11637-2024, https://doi.org/10.5194/acp-24-11637-2024, 2024
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Understanding lightning activity is important for meteorology and atmospheric chemistry. However, the occurrence of lightning activity in clouds is uncertain. In this study, we quantified the difference between isolated thunderstorms and non-thunderstorms. We showed that lightning activity was more likely to occur with more graupel volume and/or riming. A deeper ZDR column was associated with lightning occurrence. This information can aid in a deeper understanding of lighting physics.
Xiaojian Zheng, Xiquan Dong, Baike Xi, Timothy Logan, and Yuan Wang
Atmos. Chem. Phys., 24, 10323–10347, https://doi.org/10.5194/acp-24-10323-2024, https://doi.org/10.5194/acp-24-10323-2024, 2024
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The marine boundary layer aerosol–cloud interactions (ACIs) are examined using in situ measurements from two aircraft campaigns over the eastern North Atlantic (ACE-ENA) and Southern Ocean (SOCRATES). The SOCRATES clouds have more and smaller cloud droplets. The ACE-ENA clouds exhibit stronger drizzle formation and growth. Results found distinctive aerosol–cloud interactions for two campaigns. The drizzle processes significantly alter sub-cloud aerosol budgets and impact the ACI assessments.
Romanos Foskinis, Ghislain Motos, Maria I. Gini, Olga Zografou, Kunfeng Gao, Stergios Vratolis, Konstantinos Granakis, Ville Vakkari, Kalliopi Violaki, Andreas Aktypis, Christos Kaltsonoudis, Zongbo Shi, Mika Komppula, Spyros N. Pandis, Konstantinos Eleftheriadis, Alexandros Papayannis, and Athanasios Nenes
Atmos. Chem. Phys., 24, 9827–9842, https://doi.org/10.5194/acp-24-9827-2024, https://doi.org/10.5194/acp-24-9827-2024, 2024
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Analysis of modeling, in situ, and remote sensing measurements reveals the microphysical state of orographic clouds and their response to aerosol from the boundary layer and free troposphere. We show that cloud response to aerosol is robust, as predicted supersaturation and cloud droplet number levels agree with those determined from in-cloud measurements. The ability to determine if clouds are velocity- or aerosol-limited allows for novel model constraints and remote sensing products.
Corey G. Amiot, Timothy J. Lang, Susan C. van den Heever, Richard A. Ferrare, Ousmane O. Sy, Lawrence D. Carey, Sundar A. Christopher, John R. Mecikalski, Sean W. Freeman, George Alexander Sokolowsky, Chris A. Hostetler, and Simone Tanelli
EGUsphere, https://doi.org/10.5194/egusphere-2024-2384, https://doi.org/10.5194/egusphere-2024-2384, 2024
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Decoupling aerosol and environmental impacts on convection is challenging. Using airborne data, we correlated microwave-frequency convective metrics with aerosol concentrations in several different environments. Medium-to-high aerosol concentrations were often strongly and positively correlated with convective intensity and frequency, especially in favorable environments based on temperature lapse rates and K-Index. Storm environment is important to consider when evaluating aerosol effects.
Dié Wang, Roni Kobrosly, Tao Zhang, Tamanna Subba, Susan van den Heever, Siddhant Gupta, and Michael Jensen
EGUsphere, https://doi.org/10.5194/egusphere-2024-2436, https://doi.org/10.5194/egusphere-2024-2436, 2024
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We use a new method to understand how tiny particles in the air, called aerosols, affect rain clouds in the Houston-Galveston area. Aerosols generally do not make these clouds grow much taller, with an average height increase of about 1 km under certain conditions. However, their effects on rainfall strength and cloud expansion are less certain. Clouds influenced by sea breezes show a stronger aerosol impact, possibly due to unaccounted factors like vertical winds in near-surface layers.
Henning Dorff, Heike Konow, Vera Schemann, and Felix Ament
Atmos. Chem. Phys., 24, 8771–8795, https://doi.org/10.5194/acp-24-8771-2024, https://doi.org/10.5194/acp-24-8771-2024, 2024
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Using synthetic dropsondes, we assess how discrete spatial sampling and temporal evolution during flight affect the accuracy of real sonde-based moisture transport divergence in Arctic atmospheric rivers (ARs). Non-instantaneous sampling during temporal AR evolution deteriorates the divergence values more than spatial undersampling. Moisture advection is the dominating factor but most sensitive to the sampling method. We suggest a minimum of seven sondes to resolve the AR divergence components.
Deli Meng, Jianping Guo, Xiaoran Guo, Yinjun Wang, Ning Li, Yuping Sun, Zhen Zhang, Na Tang, Haoran Li, Fan Zhang, Bing Tong, Hui Xu, and Tianmeng Chen
Atmos. Chem. Phys., 24, 8703–8720, https://doi.org/10.5194/acp-24-8703-2024, https://doi.org/10.5194/acp-24-8703-2024, 2024
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The turbulence in the planetary boundary layer (PBL) over the Tibetan Plateau (TP) remains unclear. Here we elucidate the vertical profile of and temporal variation in the turbulence dissipation rate in the PBL over the TP based on a radar wind profiler (RWP) network. To the best of our knowledge, this is the first time that the turbulence profile over the whole TP has been revealed. Furthermore, the possible mechanisms of clouds acting on the PBL turbulence structure are investigated.
Leandro Alex Moreira Viscardi, Giuseppe Torri, David K. Adams, and Henrique de Melo Jorge Barbosa
Atmos. Chem. Phys., 24, 8529–8548, https://doi.org/10.5194/acp-24-8529-2024, https://doi.org/10.5194/acp-24-8529-2024, 2024
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We evaluate the environmental conditions that control how clouds grow from fair weather cumulus into severe thunderstorms during the Amazonian wet season. Days with rain clouds begin with more moisture in the air and have strong convergence in the afternoon, while precipitation intensity increases with large-scale vertical velocity, moisture, and low-level wind. These results contribute to understanding how clouds form over the rainforest.
Vinicius dos Santos, Didier Gastmans, Ana María Durán-Quesada, Ricardo Sánchez-Murillo, Kazimierz Rozanski, Oliver Kracht, and Demilson de Assis Quintão
Atmos. Chem. Phys., 24, 6663–6680, https://doi.org/10.5194/acp-24-6663-2024, https://doi.org/10.5194/acp-24-6663-2024, 2024
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We present novel findings on convective rainfall, summer rain in the late afternoon, by coupling water stable isotopes, micro rain radar, and satellite data. We found the tallest clouds in the afternoon and much smaller clouds at night, resulting in differences in day–night ratios in water stable isotopes. We sampled rain and meteorological variables every 5–10 min, allowing us to evaluate the development of convective rainfall, contributing to knowledge of rainfall related to extreme events.
Ewan Crosbie, Luke D. Ziemba, Michael A. Shook, Taylor Shingler, Johnathan W. Hair, Armin Sorooshian, Richard A. Ferrare, Brian Cairns, Yonghoon Choi, Joshua DiGangi, Glenn S. Diskin, Chris Hostetler, Simon Kirschler, Richard H. Moore, David Painemal, Claire Robinson, Shane T. Seaman, K. Lee Thornhill, Christiane Voigt, and Edward Winstead
Atmos. Chem. Phys., 24, 6123–6152, https://doi.org/10.5194/acp-24-6123-2024, https://doi.org/10.5194/acp-24-6123-2024, 2024
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Marine clouds are found to clump together in regions or lines, readily discernible from satellite images of the ocean. While clustering is also a feature of deep storm clouds, we focus on smaller cloud systems associated with fair weather and brief localized showers. Two aircraft sampled the region around these shallow systems: one incorporated measurements taken within, adjacent to, and below the clouds, while the other provided a survey from above using remote sensing techniques.
Siddhant Gupta, Dié Wang, Scott E. Giangrande, Thiago S. Biscaro, and Michael P. Jensen
Atmos. Chem. Phys., 24, 4487–4510, https://doi.org/10.5194/acp-24-4487-2024, https://doi.org/10.5194/acp-24-4487-2024, 2024
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We examine the lifecycle of isolated deep convective clouds (DCCs) in the Amazon rainforest. Weather radar echoes from the DCCs are tracked to evaluate their lifecycle. The DCC size and intensity increase, reach a peak, and then decrease over the DCC lifetime. Vertical profiles of air motion and mass transport from different seasons are examined to understand the transport of energy and momentum within DCC cores and to address the deficiencies in simulating DCCs using weather and climate models.
Benjamin Kirbus, Imke Schirmacher, Marcus Klingebiel, Michael Schäfer, André Ehrlich, Nils Slättberg, Johannes Lucke, Manuel Moser, Hanno Müller, and Manfred Wendisch
Atmos. Chem. Phys., 24, 3883–3904, https://doi.org/10.5194/acp-24-3883-2024, https://doi.org/10.5194/acp-24-3883-2024, 2024
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A research aircraft is used to track the changes in air temperature, moisture, and cloud properties for air that moves from cold Arctic sea ice onto warmer oceanic waters. The measurements are compared to two reanalysis models named ERA5 and CARRA. The biggest differences are found for air temperature over the sea ice and moisture over the ocean. CARRA data are more accurate than ERA5 because they better simulate the sea ice, the transition from sea ice to open ocean, and the forming clouds.
Raphael Satoru Märkl, Christiane Voigt, Daniel Sauer, Rebecca Katharina Dischl, Stefan Kaufmann, Theresa Harlaß, Valerian Hahn, Anke Roiger, Cornelius Weiß-Rehm, Ulrike Burkhardt, Ulrich Schumann, Andreas Marsing, Monika Scheibe, Andreas Dörnbrack, Charles Renard, Maxime Gauthier, Peter Swann, Paul Madden, Darren Luff, Reetu Sallinen, Tobias Schripp, and Patrick Le Clercq
Atmos. Chem. Phys., 24, 3813–3837, https://doi.org/10.5194/acp-24-3813-2024, https://doi.org/10.5194/acp-24-3813-2024, 2024
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In situ measurements of contrails from a large passenger aircraft burning 100 % sustainable aviation fuel (SAF) show a 56 % reduction in contrail ice crystal numbers compared to conventional Jet A-1. Results from a climate model initialized with the observations suggest a significant decrease in radiative forcing from contrails. Our study confirms that future increased use of low aromatic SAF can reduce the climate impact from aviation.
Philippe Ricaud, Massimo Del Guasta, Angelo Lupi, Romain Roehrig, Eric Bazile, Pierre Durand, Jean-Luc Attié, Alessia Nicosia, and Paolo Grigioni
Atmos. Chem. Phys., 24, 613–630, https://doi.org/10.5194/acp-24-613-2024, https://doi.org/10.5194/acp-24-613-2024, 2024
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Clouds affect the Earth's climate in ways that depend on the type of cloud (solid/liquid water). From observations at Concordia (Antarctica), we show that in supercooled liquid water (liquid water for temperatures below 0°C) clouds (SLWCs), temperature and SLWC radiative forcing increase with liquid water (up to 70 W m−2). We extrapolated that the maximum SLWC radiative forcing can reach 40 W m−2 over the Antarctic Peninsula, highlighting the importance of SLWCs for global climate prediction.
Cheikh Dione, Martial Haeffelin, Frédéric Burnet, Christine Lac, Guylaine Canut, Julien Delanoë, Jean-Charles Dupont, Susana Jorquera, Pauline Martinet, Jean-François Ribaud, and Felipe Toledo
Atmos. Chem. Phys., 23, 15711–15731, https://doi.org/10.5194/acp-23-15711-2023, https://doi.org/10.5194/acp-23-15711-2023, 2023
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This paper documents the role of thermodynamics and turbulence in the fog life cycle over southwestern France. It is based on a unique dataset collected during the SOFOG3D field campaign in autumn and winter 2019–2020. The paper gives a threshold for turbulence driving the different phases of the fog life cycle and the role of advection in the night-time dissipation of fog. The results can be operationalised to nowcast fog and improve short-range forecasts in numerical weather prediction models.
Hui Xu, Jianping Guo, Bing Tong, Jinqiang Zhang, Tianmeng Chen, Xiaoran Guo, Jian Zhang, and Wenqing Chen
Atmos. Chem. Phys., 23, 15011–15038, https://doi.org/10.5194/acp-23-15011-2023, https://doi.org/10.5194/acp-23-15011-2023, 2023
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The radiative effect of cloud remains one of the largest uncertain factors in climate change, largely due to the lack of cloud vertical structure (CVS) observations. The study presents the first near-global CVS climatology using high-vertical-resolution soundings. Single-layer cloud mainly occurs over arid regions. As the number of cloud layers increases, clouds tend to have lower bases and thinner layer thicknesses. The occurrence frequency of cloud exhibits a pronounced seasonal diurnal cycle.
Elena De La Torre Castro, Tina Jurkat-Witschas, Armin Afchine, Volker Grewe, Valerian Hahn, Simon Kirschler, Martina Krämer, Johannes Lucke, Nicole Spelten, Heini Wernli, Martin Zöger, and Christiane Voigt
Atmos. Chem. Phys., 23, 13167–13189, https://doi.org/10.5194/acp-23-13167-2023, https://doi.org/10.5194/acp-23-13167-2023, 2023
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In this study, we show the differences in the microphysical properties between high-latitude (HL) cirrus and mid-latitude (ML) cirrus over the Arctic, North Atlantic, and central Europe during summer. The in situ measurements are combined with backward trajectories to investigate the influence of the region on cloud formation. We show that HL cirrus are characterized by a lower concentration of larger ice crystals when compared to ML cirrus.
Mampi Sarkar, Adriana Bailey, Peter Blossey, Simon P. de Szoeke, David Noone, Estefanía Quiñones Meléndez, Mason D. Leandro, and Patrick Y. Chuang
Atmos. Chem. Phys., 23, 12671–12690, https://doi.org/10.5194/acp-23-12671-2023, https://doi.org/10.5194/acp-23-12671-2023, 2023
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We study rain evaporation characteristics below shallow cumulus clouds over the North Atlantic Ocean by pairing isotope observations with a microphysical model. The modeled fraction of rain mass that evaporates below the cloud strongly depends on the raindrop size and distribution width. Moreover, the higher the rain mass fraction evaporated, the greater the change in deuterium excess. In this way, rain evaporation could be studied independently using only isotope and microphysical observations.
Simon Kirschler, Christiane Voigt, Bruce E. Anderson, Gao Chen, Ewan C. Crosbie, Richard A. Ferrare, Valerian Hahn, Johnathan W. Hair, Stefan Kaufmann, Richard H. Moore, David Painemal, Claire E. Robinson, Kevin J. Sanchez, Amy J. Scarino, Taylor J. Shingler, Michael A. Shook, Kenneth L. Thornhill, Edward L. Winstead, Luke D. Ziemba, and Armin Sorooshian
Atmos. Chem. Phys., 23, 10731–10750, https://doi.org/10.5194/acp-23-10731-2023, https://doi.org/10.5194/acp-23-10731-2023, 2023
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In this study we present an overview of liquid and mixed-phase clouds and precipitation in the marine boundary layer over the western North Atlantic Ocean. We compare microphysical properties of pure liquid clouds to mixed-phase clouds and show that the initiation of the ice phase in mixed-phase clouds promotes precipitation. The observational data presented in this study are well suited for investigating the processes that give rise to liquid and mixed-phase clouds, ice, and precipitation.
Meng Xing, Weiguo Liu, Jing Hu, and Zheng Wang
Atmos. Chem. Phys., 23, 9123–9136, https://doi.org/10.5194/acp-23-9123-2023, https://doi.org/10.5194/acp-23-9123-2023, 2023
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The below-cloud evaporation effect (BCE) on precipitation largely impacts the final isotopic composition. However, determining the BCE effect remains poorly constrained. Our work used a ΔdΔδ diagram to differentiate the below-cloud processes. Moreover, by comparing two different computing methods, we considered that both methods are suitable for evaluation the BCE, except for snowfall events. Overall, our work compiled a set of effective methods to evaluate the BCE effect.
McKenna W. Stanford, Ann M. Fridlind, Israel Silber, Andrew S. Ackerman, Greg Cesana, Johannes Mülmenstädt, Alain Protat, Simon Alexander, and Adrian McDonald
Atmos. Chem. Phys., 23, 9037–9069, https://doi.org/10.5194/acp-23-9037-2023, https://doi.org/10.5194/acp-23-9037-2023, 2023
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Clouds play an important role in the Earth’s climate system as they modulate the amount of radiation that either reaches the surface or is reflected back to space. This study demonstrates an approach to robustly evaluate surface-based observations against a large-scale model. We find that the large-scale model precipitates too infrequently relative to observations, contrary to literature documentation suggesting otherwise based on satellite measurements.
Valerian Hahn, Ralf Meerkötter, Christiane Voigt, Sonja Gisinger, Daniel Sauer, Valéry Catoire, Volker Dreiling, Hugh Coe, Cyrille Flamant, Stefan Kaufmann, Jonas Kleine, Peter Knippertz, Manuel Moser, Philip Rosenberg, Hans Schlager, Alfons Schwarzenboeck, and Jonathan Taylor
Atmos. Chem. Phys., 23, 8515–8530, https://doi.org/10.5194/acp-23-8515-2023, https://doi.org/10.5194/acp-23-8515-2023, 2023
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During the DACCIWA campaign in West Africa, we found a 35 % increase in the cloud droplet concentration that formed in a polluted compared with a less polluted environment and a decrease of 17 % in effective droplet diameter. Radiative transfer simulations, based on the measured cloud properties, reveal that these low-level polluted clouds radiate only 2.6 % more energy back to space, compared with a less polluted cloud. The corresponding additional decrease in temperature is rather small.
Silke Groß, Tina Jurkat-Witschas, Qiang Li, Martin Wirth, Benedikt Urbanek, Martina Krämer, Ralf Weigel, and Christiane Voigt
Atmos. Chem. Phys., 23, 8369–8381, https://doi.org/10.5194/acp-23-8369-2023, https://doi.org/10.5194/acp-23-8369-2023, 2023
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Aviation-emitted aerosol can have an impact on cirrus clouds. We present optical and microphysical properties of mid-latitude cirrus clouds which were formed under the influence of aviation-emitted aerosol or which were formed under rather pristine conditions. We find that cirrus clouds affected by aviation-emitted aerosol show larger values of the particle linear depolarization ratio, larger mean effective ice particle diameters and decreased ice particle number concentrations.
Emma Järvinen, Franziska Nehlert, Guanglang Xu, Fritz Waitz, Guillaume Mioche, Regis Dupuy, Olivier Jourdan, and Martin Schnaiter
Atmos. Chem. Phys., 23, 7611–7633, https://doi.org/10.5194/acp-23-7611-2023, https://doi.org/10.5194/acp-23-7611-2023, 2023
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The Arctic is warming faster than other regions. Arctic low-level mixed-phase clouds, where ice crystals and liquid droplets co-exist, are thought to have an important role in Arctic warming. Here we show airborne measurements of vertical distribution of liquid and ice particles and their relative abundance. Ice particles are found in relative warm clouds, which can be explained by multiplication of existing ice crystals. However, the role of ice particles in redistributing sun light is minimal.
Manuel Moser, Christiane Voigt, Tina Jurkat-Witschas, Valerian Hahn, Guillaume Mioche, Olivier Jourdan, Régis Dupuy, Christophe Gourbeyre, Alfons Schwarzenboeck, Johannes Lucke, Yvonne Boose, Mario Mech, Stephan Borrmann, André Ehrlich, Andreas Herber, Christof Lüpkes, and Manfred Wendisch
Atmos. Chem. Phys., 23, 7257–7280, https://doi.org/10.5194/acp-23-7257-2023, https://doi.org/10.5194/acp-23-7257-2023, 2023
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This study provides a comprehensive microphysical and thermodynamic phase analysis of low-level clouds in the northern Fram Strait, above the sea ice and the open ocean, during spring and summer. Using airborne in situ cloud data, we show that the properties of Arctic low-level clouds vary significantly with seasonal meteorological situations and surface conditions. The observations presented in this study can help one to assess the role of clouds in the Arctic climate system.
Rachel Atlas and Christopher S. Bretherton
Atmos. Chem. Phys., 23, 4009–4030, https://doi.org/10.5194/acp-23-4009-2023, https://doi.org/10.5194/acp-23-4009-2023, 2023
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The tropical tropopause layer exists between the troposphere and the stratosphere in the tropics. Very thin cirrus clouds cool Earth's surface by scrubbing water vapor (a greenhouse gas) out of air parcels as they ascend through the tropical tropopause layer on their way to the stratosphere. We show observational evidence from aircraft that small-scale (< 100 km) gravity waves and turbulence increase the amount of ice in these clouds and may allow them to remove more water vapor from the air.
Konstantinos Matthaios Doulgeris, Ville Vakkari, Ewan J. O'Connor, Veli-Matti Kerminen, Heikki Lihavainen, and David Brus
Atmos. Chem. Phys., 23, 2483–2498, https://doi.org/10.5194/acp-23-2483-2023, https://doi.org/10.5194/acp-23-2483-2023, 2023
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We investigated how different long-range-transported air masses can affect the microphysical properties of low-level clouds in a clean subarctic environment. A connection was revealed. Higher values of cloud droplet number concentrations were related to continental air masses, whereas the lowest values of number concentrations were related to marine air masses. These were characterized by larger cloud droplets. Clouds in all regions were sensitive to increases in cloud number concentration.
Fayçal Lamraoui, Martina Krämer, Armin Afchine, Adam B. Sokol, Sergey Khaykin, Apoorva Pandey, and Zhiming Kuang
Atmos. Chem. Phys., 23, 2393–2419, https://doi.org/10.5194/acp-23-2393-2023, https://doi.org/10.5194/acp-23-2393-2023, 2023
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Cirrus in the tropical tropopause layer (TTL) can play a key role in vertical transport. We investigate the role of different cloud regimes and the associated ice habits in regulating the properties of the TTL. We use high-resolution numerical experiments at the scales of large-eddy simulations (LESs) and aircraft measurements. We found that LES-scale parameterizations that predict ice shape are crucial for an accurate representation of TTL cirrus and thus the associated (de)hydration process.
Yun Li, Christoph Mahnke, Susanne Rohs, Ulrich Bundke, Nicole Spelten, Georgios Dekoutsidis, Silke Groß, Christiane Voigt, Ulrich Schumann, Andreas Petzold, and Martina Krämer
Atmos. Chem. Phys., 23, 2251–2271, https://doi.org/10.5194/acp-23-2251-2023, https://doi.org/10.5194/acp-23-2251-2023, 2023
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The radiative effect of aviation-induced cirrus is closely related to ambient conditions and its microphysical properties. Our study investigated the occurrence of contrail and natural cirrus measured above central Europe in spring 2014. It finds that contrail cirrus appears frequently in the pressure range 200 to 245 hPa and occurs more often in slightly ice-subsaturated environments than expected. Avoiding slightly ice-subsaturated regions by aviation might help mitigate contrail cirrus.
Flor Vanessa Maciel, Minghui Diao, and Ryan Patnaude
Atmos. Chem. Phys., 23, 1103–1129, https://doi.org/10.5194/acp-23-1103-2023, https://doi.org/10.5194/acp-23-1103-2023, 2023
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Aerosol indirect effects on cirrus clouds are investigated during cirrus evolution, using global-scale in situ observations and climate model simulations. As cirrus evolves, the mechanisms to form ice crystals also change with time. Both small and large aerosols are found to affect cirrus properties. Southern Hemisphere cirrus appears to be more sensitive to additional aerosols. The climate model underestimates ice crystal mass, likely due to biases of relative humidity and vertical velocity.
Cited articles
Ali, S., Mehta, S. K., Annamalai, V., Ananthavel, A., and Reddy, R.:
Qualitative observations of the cirrus clouds effect on the thermal
structure of the tropical tropopause, J. Atmos.
Sol.-Terr. Phys., 211, 105440, https://doi.org/10.1016/j.jastp.2020.105440, 2020.
Ananthavel, A., Mehta, S. K., Ali, S., Reddy, T. R., Annamalai, V., and Rao,
D. N: Micro Pulse Lidar measurements in coincidence with CALIPSO overpasses:
Comparison of tropospheric aerosols over Kattankulathur (12.82∘ N,
80.04∘ E), Atmos. Pollut. Res., 12, 101082, https://doi.org/10.1016/j.apr.2021.101082, 2021a.
Ananthavel, A., Mehta, S. K., Reddy, T. R., Ali, S., and Rao, D. N.:
Vertical distributions and columnar properties of the aerosols during
different seasons over Kattankulathur (12.82∘ N, 80.04∘ E): A
semi-urban tropical coastal station, Atmos. Environ., 256, 118457, https://doi.org/10.1016/j.atmosenv.2021.118457,
2021b.
Annamalai, V. and Mehta, S. K.: Extreme variability of the tropical tropopause
over the Indian monsoon region, Clim. Dynam.,
https://doi.org/10.1007/s00382-022-06264-7, 2022.
Campbell, J. R., Welton, E. J., Spinhirne, J. D., Ji, Q., Tsay, S. C.,
Piketh, S. J., and Holben, B. N.: Micropulse lidar observations of
tropospheric aerosols over northeastern South Africa during the ARREX and
SAFARI 2000 dry season experiments, J. Geophys. Res., 108, 8497,
https://doi.org/10.1029/2002JD002563, 2003.
Chen, S. S. and Houze Jr., R. A.:Diurnal variation and life-cycle of
deep convective systems over the tropical Pacific warm pool, Q.
J. Roy. Meteorol. Soc., 123, 357–388, 1997.
Corti, T., Luo, B. P., Fu, Q., Vömel, H., and Peter, T.: The impact of
cirrus clouds on tropical troposphere-to-stratosphere transport, Atmos.
Chem. Phys., 6, 2539–2547, https://doi.org/10.5194/acp-6-2539-2006, 2006.
Cziczo, D. J. and Froyd, K. D.: Sampling the composition of cirrus ice
residuals, Atmos. Res., 142, 15–31, https://doi.org/10.1016/j.atmosres.2013.06.012,
2014.
Dai, G., Wu, S., Song, X., and Liu, L.: Optical and Geometrical Properties of
Cirrus Clouds over the Tibetan Plateau Measured by Lidar and Radiosonde
Sounding at the Summertime in 2014, Remote
Sens., 2019, 302,
https://doi.org/10.1051/epjconf/201817605040, 2017.
Das, S. K., Chiang, C. W., and Nee, J. B.: Influence of tropical easterly jet
on upper tropical cirrus: An observational study from CALIPSO, Aura-MLS, and
NCEP/NCAR data, J. Geophys. Res.-Atmos., 116, D12, https://doi.org/10.1029/2011JD015923,
2011.
Dessler, A. E., Palm, S. P., Hart, W. D., and Spinhirne, J. D.:
Tropopause-level thin cirrus coverage revealed by ICESat/Geoscience Laser
Altimeter System, J. Geophys. Res.-Atmos., 111, 1–10, https://doi.org/10.1029/2005JD006586, 2006.
Devasthale, A. and Fueglistaler, S.: A climatological perspective of deep convection penetrating the TTL during the Indian summer monsoon from the AVHRR and MODIS instruments, Atmos. Chem. Phys., 10, 4573–4582, https://doi.org/10.5194/acp-10-4573-2010, 2010.
Davis, S. M., Liang, C. K., and Rosenlof, K. H.: Interannual
variability of tropical tropopause layer clouds, Geophys. Res.
Lett., 40, 2862–2866, 2013.
Dowling, D. R. and Radke, L. F.: A summary of the physical
properties of cirrus clouds, J. Appl. Meteorol. Climatol.,
29, 970–978, 1990.
Eriksson, P., Rydberg, B., Johnston, M., Murtagh, D. P., Struthers, H., Ferrachat, S., and Lohmann, U.: Diurnal variations of humidity and ice water content in the tropical upper troposphere, Atmos. Chem. Phys., 10, 11519–11533, https://doi.org/10.5194/acp-10-11519-2010, 2010.
Feofilov, A. G. and Stubenrauch, C. J.: Diurnal variation of high-level clouds from the synergy of AIRS and IASI space-borne infrared sounders, Atmos. Chem. Phys., 19, 13957–13972, https://doi.org/10.5194/acp-19-13957-2019, 2019.
Fleming, J. R. and Cox, S. K.: Radiative effects of cirrus clouds, J.
Atmos. Sci., 31, 2182–2188, 1974.
Flynn, C. J., Mendoza, A., Zheng, Y., and Mathur, S.: Novel
polarization-sensitive micropulse lidar measurement technique, Opt.
Exp., 15, 2785–2790, 2007.
Fu, Q. and Liou, K. N.: Parameterization of the Radiative Properties of
Cirrus Clouds, J. Atmos. Sci., 50, 2008–2025,
https://doi.org/10.1175/1520-0469(1993)050<2008:POTRPO>2.0.CO;2,
1993.
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.
Fujiwara, M., Iwasaki, S., Shimizu, A., Inai, Y., Shiotani, M., Hasebe, F.,
Matsui, I., Sugimoto, N., Okamoto, H., Nishi, N., Hamada, A., Sakazaki, T.,
and Yoneyama, K.: Cirrus observations in the tropical tropopause layer over
the western Pacific, J. Geophys. Res., 114, D09304,
https://doi.org/10.1029/2008JD011040, 2009.
Goswami, B. N. and Xavier, P. K.: ENSO control on the south
Asian monsoon through the length of the rainy season, Geophys. Res.
Lett., 32, https://doi.org/10.1029/2005GL023216, 2005.
Gouveia, D. A., Barja, B., Barbosa, H. M. J., Seifert, P., Baars, H., and
Pauliquevis, T.: Optical and geometrical properties of cirrus clouds in
Amazonia derived from 1 year of ground-based lidar measurements, Atmos. Chem. Phys., 17,
3619–3636, https://doi.org/10.5194/acp-17-3619-2017, 2017.
Gupta, A. K., Rajeev, K., and Sijikumar, S.: Day-night changes in the
altitude distribution, physical properties and radiative impact of
low-altitude clouds over the stratocumulus-dominated subtropical oceans,
J. Atmos. Sol.-Terr. Phys., 161, 118–126, 2017.
Haladay, T. and Stephens, G.: Characteristics of tropical thin cirrus clouds
deduced from joint CloudSat and CALIPSO observations, J. Geophys. Res.-Atmos., 114, 1–13, https://doi.org/10.1029/2008JD010675, 2009.
Held, I. M. and Hoskins, B. J.: Large-scale eddies and the general
circulation of the troposphere, in: Advances in geophysics, Elsevier, Vol. 28,
3–31, https://doi.org/10.1016/S0065-2687(08)60218-6, 1985
JCA Marrero, B. B.: Cirrus Clouds Optical Properties Measured With Lidar At
Camagüey, Cuba, Propiedades Ópticas de Nubes Cirros Medidas con
Lidar en Camagüey, Cuba, Opt. Pura Apl., 39, 11–16, 2006.
Heymsfield, A. J.: Ice particles observed in a cirriform cloud at
−83 ∘C and implications for polar stratospheric clouds, J. Atmos.
Sci., 43, 851–855, 1986.
Heymsfield, A. J. and Iaquinta, J.: Cirrus crystal terminal velocities, J.
Atmos. Sci., 57, 914–936, 2000.
Jakob, C.: Ice clouds in numerical weather prediction models:
Progress, problems, and prospects, Cirrus, Oxford University Press, https://doi.org/10.1093/oso/9780195130720.001.0001, 2002.
Jensen, E. J., Toon, O. B., Pfister, L., and Selkirk, H. B.: Dehydration of
the upper troposphere and lower by subvisible cirrus clouds near the
tropical tropopause, Geophys. Res. Lett., 23, 825–828, 1996.
Jensen, E. J., Diskin, G., Lawson, R. P., Lance, S., Bui, T. P., Hlavka, D.,
McGill, M., Pfister, L., Toon, O. B., and Gao, R.: Ice nucleation and
dehydration in the Tropical Tropopause Layer, P. Natl. Acad. Sci. USA,
110, 2041–2046, https://doi.org/10.1073/pnas.1217104110, 2013.
Kim, J., Grise, K. M., and Son, S.-W.: Thermal characteristics of the
cold-point tropopause region in CMIP5 models, J. Geophys. Res.-Atmos.,
118, 8827–8841, https://doi.org/10.1002/jgrd.50649, 2013.
Kim, J.-E., Alexander, M. J., Bui, T. P., Dean-Day, J. M., Lawson, R. P.,
Woods, S., Hlavka, D., Pfister, L., and Jensen, E. J.: Ubiquitous influence of waves on tropical high cirrus
clouds, Geophys. Res. Lett., 43, 5895–5901, 2016.
Kottayil, A., Satheesan, K., John, V. O., and Antony, R.: Diurnal variation of deep convective clouds over Indian monsoon region and its association with rainfall, Atmos. Res., 255, 105540, https://doi.org/10.1016/j.atmosres.2021.105540, 2021.
Kulkarni, P., Ramachandran, S., Bhavani Kumar, Y., Narayana Rao, D., and
Krishnaiah, M.: Features of upper troposphere and lower stratosphere
aerosols observed by lidar over Gadanki, a tropical Indian station, J.
Geophys. Res., 113, D17207, https://doi.org/10.1029/2007JD009411, 2008.
Li, J., Yi, Y., Minnis, P., Huang, J., Yan, H., Ma, Y., and Ayers, J.
K.: Radiative effect differences between multi-layered and single-layer
clouds derived from CERES, CALIPSO, and CloudSat data, J.
Quant. Spectrosc. Ra., 112, 361–375, 2011.
Liou, K. N.: Influence of cirrus clouds on weather and climate
processes A global perspective, Mon. Weather Rev., 114, 1167–1199,
https://doi.org/10.1175/1520-0493(1986)114<1167:IOCCOW>2.0.CO;2,
1986.
Liu, Z., Vaughan, M., Winker, D., Kittaka, C., Getzewich, B., Kuehn, R.,
Omar, A., Powell, K., Trepte, C., and Hostetler, C.: The CALIPSO Lidar Cloud and
Aerosol Discrimination: Version 2 Algorithm and Initial Assessment of
Performance, J. Atmos. Ocean. Technol., 26, 1198–1213,
https://doi.org/10.1175/2009JTECHA1229.1, 2009.
Lynch, D. K.: Cirrus, Oxford University Press,
https://books.google.co.in/books/about/Cirrus.html?id=58v1fg4xeo8C
(last access: 25 October 2018), 2002.
Massie, S. T., Khosravi, R., and Gille, J. C.: A multidecadal study of cirrus
in the tropical tropopause layer, J. Geophys. Res.-Atmos., 118, 7938–7947,
https://doi.org/10.1002/jgrd.50596, 2013.
McFarquhar, G. M., Heymsfield, A. J., Spinhirne, J., and Hart, B.: Thin and
Subvisual Tropopause Tropical Cirrus: Observations and Radiative Impacts, J.
Atmos. Sci., 57, 1841–1853, https://doi.org/10.1175/1520-0469(2000)057<1841:TASTTC>2.0.CO;2, 2000.
Meenu, S., Rajeev, K., and Parameswaran, K.: Regional and vertical
distribution of semitransparent cirrus clouds over the tropical Indian
region derived from CALIPSO data, J. Atmos. Sol.-Terr. Phys., 73,
1967–1979, https://doi.org/10.1016/j.jastp.2011.06.007, 2011.
Mehta, S. K., Venkat Ratnam, M., and Krishna Murthy, B. V.:
Characteristics of the tropical tropopause over different longitudes,
J. Atmos. Sol.-Terr. Phys., 73, 2462–2473, 2011.
Mehta, S. K., Fujiwara, M., Tsuda, T., and Vernier, J. P: Effect of recent
minor volcanic eruptions on temperatures in the upper troposphere and lower
stratosphere, J. Atmos. Sol.-Terr. Phys., 129,
99–110, 2015.
Mitchell, D. L., Rasch, P., Ivanova, D., McFarquhar, G., and Nousiainen, T.:
Impact of small ice crystal assumptions on ice sedimentation rates in cirrus
clouds and GCM simulations, Geophys. Res. Lett., 35, https://doi.org/10.1029/2008GL033552, 2008.
Muhsin, M., Sunilkumar, S. V., Ratnam, M. V., Parameswaran, K., Murthy, B.
K., Ramkumar, G., and Rajeev, K.: Diurnal variation of atmospheric stability
and turbulence during different seasons in the troposphere and lower
stratosphere derived from simultaneous radiosonde observations at two
tropical stations, in the Indian Peninsula, Atmos. Res., 180,
12–23, 2016.
Muhsin, M., Sunilkumar, S. V., Venkat Ratnam, M., Krishna Murthy, B. V., and
Parameswaran, K.: Seasonal and diurnal variations of tropical tropopause
layer (TTL) over the Indian Peninsula, J. Geophys. Res.-Atmos., 122, 12–672, 2017.
Murthy, B. V. K., Satheesan, K., Parameswaran, K., Sasi, M. N., Ramkumar,
G., Bhavanikumar, Y., Raghunath, K., and Krishniah, M.: Equatorial waves in
temperature in the altitude range 4 to 70 km, Q. J. R. Meteorol. Soc.,
128, 819–837, https://doi.org/10.1256/0035900021643700, 2002.
Nair, A. K. M., Rajeev, K., Mishra, M. K., Thampi, B. V., and Parameswaran,
K.: Multiyear lidar observations of the descending nature of tropical cirrus
clouds, J. Geophys. Res.-Atmos., 117, 1–9, https://doi.org/10.1029/2011JD017406,
2012.
Nazaryan, H., McCormick, M. P., and Menzel, W. P.: Global characterization of
cirrus clouds using CALIPSO data, J. Geophys. Res.-Atmos., 113, 1–11,
https://doi.org/10.1029/2007JD009481, 2008.
Noel, V., Chepfer, H., Chiriaco, M., and Yorks, J.: The diurnal cycle of cloud profiles over land and ocean between 51∘ S and 51∘ N, seen by the CATS spaceborne lidar from the International Space Station, Atmos. Chem. Phys., 18, 9457–9473, https://doi.org/10.5194/acp-18-9457-2018, 2018.
Pal, S. R., Steinbrecht, W., and Carswell, A. I.: Automated method for lidar
determination of cloud-base height and vertical extent, Appl. Opt., 31,
1488, https://doi.org/10.1364/AO.31.001488, 1992.
Pan, L. L. and Munchak, L. A.: Relationship of cloud top to the tropopause
and jet structure from CALIPSO data, J. Geophys. Res.-Atmos., 116,
1–17, https://doi.org/10.1029/2010JD015462, 2011.
Pandit, A. K., Gadhavi, H., Ratnam, M. V., Jayaraman, A., Raghunath, K., and
Rao, S. V. B.: Characteristics of cirrus clouds and tropical tropopause
layer: Seasonal variation and long-term trends, J. Atmos. Sol.-Terr.
Phys., 121, 248–256, https://doi.org/10.1016/j.jastp.2014.07.008, 2014.
Pandit, A. K., Gadhavi, H. S., Ratnam, M. V., Raghunath, K., Rao, S. V. B.,
and Jayaraman, A.: Long-term trend analysis and climatology of tropical
cirrus clouds using 16 years of lidar data set over Southern India, Atmos.
Chem. Phys., 15, 13833–13848, https://doi.org/10.5194/acp-15-13833-2015, 2015.
Parameswaran, K., SunilKumar, S. V., Krishna Murthy, B. V., Satheesan, K.,
Bhavani Kumar, Y., Krishnaiah, M., and Nair, P. R.: Lidar observations of
cirrus cloud near the tropical tropopause: Temporal variations and
association with tropospheric turbulence, Atmos. Res., 69, 29–49,
https://doi.org/10.1016/j.atmosres.2003.08.002, 2003.
Parameswaran, K., Sunilkumar, S. V., Murthy, B. K., and Satheesan, K.: Lidar observations of high altitude cirrus clouds
near the tropical tropopause, Adv. Space Res., 34, 845–850, 2004.
Platt, C. M., Young, S. A., Carswell, A. I., Pal, S. R., McCormick, M. P.,
Winker, D. M., DelGuasta, M., Stefanutti, L., Eberhard, W. L., Hardesty, M.,
Flamant, P. H., Valentin, R., Forgan, B., Gimmestad, G. G., Jäger, H.,
Khmelevtsov, S. S., Kolev, I., Kaprieolev, B., Lu, D., Sassen, K.,
Shamanaev, V. S., Uchino, O., Mizuno, Y., Wandinger, U., Weitkamp, C.,
Ansmann, A., and Wooldridge, C.: The Experimental Cloud Lidar Pilot Study
(ECLIPS) for Cloud – Radiation Research, Bull. Am. Meteorol. Soc., 75,
1635–1654, https://doi.org/10.1175/1520-0477(1994)075<1635:TECLPS>2.0.CO;2, 1994.
Podglajen, A., Plougonven, R., Hertzog, A., and Jensen, E.: Impact of gravity
waves on the motion and distribution of atmospheric ice particles, Atmos.
Chem. Phys., 18, 10799–10823, https://doi.org/10.5194/acp-18-10799-2018, 2018.
Ramkumar, T. K., Niranjan Kumar, K., and Mehta, S. K.:
Mesosphere-stratosphere-troposphere radar observations of characteristics of
lower atmospheric high-frequency gravity waves passing through the tropical
easterly jet, J. Geophys. Res.-Atmos., 115, https://doi.org/10.1029/2009JD013733, 2010.
Randel, W. J. and Jensen, E. J.: Physical processes in the tropical
tropopause layer and their roles in a changing climate, Nat. Geosci.,
6, 169–176, 2013.
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.
Ratnam, M. V., Raman, M. R., Mehta, S. K., Nath, D., Krishnamurthy, B. V.,
Rajeevan, M., and Rao, D. N.: Sub-daily variations observed in
Tropical Easterly Jet (TEJ) streams, J. Atmos. Sol.-Terr. Phys., 73, 731–740, 2011.
Reddy, T. R., Mehta, S. K., Ananthavel, A., Ali, S., Annamalai, V., and Rao,
D. N.:Seasonal characteristics of sea breeze and thermal internal boundary
layer over Indian east coast region, Meteorol. Atmos. Phys., 133, 217–232, 2020.
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.-Atmos., 117, 1–10,
https://doi.org/10.1029/2012JD017751, 2012.
Sandhya, M., Sridharan, S., Indira Devi, M., Niranjan, K., and Jayaraman, A.: A case study of formation and maintenance of a lower stratospheric cirrus cloud over the tropics, Ann. Geophys., 33, 599–608, https://doi.org/10.5194/angeo-33-599-2015, 2015.
Sassen, K. and Byung, S. C.: Subvisual-thin cirrus lidar dataset
for satellite verification and climatological research, J. Appl.
Meteorol. Climatol., 31, 1275–1285, 1992.
Sassen, K., Wang, Z., and Liu, D.: Global distribution of cirrus clouds from
CloudSat/Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations
(CALIPSO) measurements, J. Geophys. Res., 113, D00A12,
https://doi.org/10.1029/2008JD009972, 2008.
Sassen, K., Wang, Z., and Liu, D.: Cirrus clouds and deep convection in the
tropics: Insights from CALIPSO and CloudSat, J. Geophys. Res.-Atmos.,
114, 1–11, https://doi.org/10.1029/2009JD011916, 2009.
Satheesan, K. and Murthy, B. V. K.: Turbulence parameters in the tropical
troposphere and lower stratosphere, J. Geophys. Res.-Atmos., 107, 1–13, 2002.
Selkirk, H. B.: The tropopause cold trap in the Australian monsoon during STEP/AMEX 1987, J. Geophys. Res.-Atmos., 98, 8591–8610, 1993.
Simpson, M., Warrior, H., Raman, S., Aswathanarayana, P. A., Mohanty, U. C., and Suresh, R.: Sea-breeze-initiated rainfall over the east coast of India during the Indian southwest monsoon, Nat. Hazard., 42, 401–413, 2007.
Sivakumar, V., Bhavanikumar, Y., Rao, P. B., Mizutani, K., Aoki, T., Yasui,
M., and Itabe, T.: Lidar observed characteristics of the tropical cirrus
clouds, Radio Sci., 38, https://doi.org/10.1029/2002RS002719, 2003.
Spinhirne, J. D., Palm, S. P., Hart, W. D., Hlavka, D. L., and Welton, E. J.:
Cloud and aerosol measurements from GLAS: Overview and initial results, Geophys. Res. Lett.,
32, 1–5, https://doi.org/10.1029/2005GL023507, 2005.
Stephens, G. L. and Webster, P. J.: Clouds and Climate: Sensitivity of
Simple Systems, J. Atmos. Sci., 38, 235–247,
https://doi.org/10.1175/1520-0469(1981)038<0235:CACSOS>2.0.CO;2,
1981.
Subrahmanyam, K. V. and Kumar, K. K.: CloudSat observations of cloud-type distribution over the Indian summer monsoon region, Ann. Geophys., 31, 1155–1162, https://doi.org/10.5194/angeo-31-1155-2013, 2013.
Sunil Kumar, S. V., Parameswaran, K., and Krishna Murthy, B. V.: Lidar
observations of cirrus cloud near the tropical tropopause: General features,
Atmos. Res., 66, 203–227, https://doi.org/10.1016/S0169-8095(02)00159-X, 2003.
Sunilkumar, S. V., Parameswaran, K., Rajeev, K., Krishna Murthy, B. V.,
Meenu, S., Mehta, S. K., and Babu, A.: Semitransparent cirrus clouds in the
tropical tropopause layer during two contrasting seasons, J. Atmos.
Sol.-Terr. Phys., 72, 745–762,
https://doi.org/10.1016/j.jastp.2010.03.020, 2010.
Tseng, H.-H. and Fu, Q.: Tropical tropopause layer cirrus and its relation
to tropopause, J. Quant. Spectrosc. Radiat. Transf., 188, 118–131,
https://doi.org/10.1016/J.JQSRT.2016.05.029, 2017.
Tsuda, T., Murayama, Y., Wiryosumarto, H., Harijono, S. W. B., and Kato, S.:
Equatorial waves and diurnal tides, J. Geophys. Res.-Atmos., 99, 10491–10505, https://doi.org/10.1029/94JD00355, 1994.
Vernier, J., Fairlie, T. D., Natarajan, M., Wienhold, F. G., Bian, J.,
Martinsson, B. G., Crumeyrolle, S., Thomason, L. W., and Bedka, K. M.:
J. Geophys. Res.-Atmos., 120, 1608–1619,
https://doi.org/10.1002/2014JD022372.Received, 2015.
Wang, T. and Dessler, A. E.: Analysis of cirrus in the tropical tropopause
layer from CALIPSO and MLS data: A water perspective, , 117,
1–10, https://doi.org/10.1029/2011JD016442, 2012.
Welton, E. J., Voss, K. J., Quinn, P. K., Flatau, P. J., Markowicz, K.,
Campbell, J. R., Spinhirne, J. D., Gordon, H. R., and Johnson, J. E.:
Measurements of aerosol vertical profiles and optical properties during
INDOEX 1999 using micropulse lidars, J. Geophys. Res.-Atmos., 107,
1–20, https://doi.org/10.1029/2000JD000038, 2002.
Winker, D. M. and Trepte, C. R: Laminar cirrus observed near the tropical
tropopause by LITE, Geophys. Res. Lett., 25, 3351–3354, 1998.
Wu, S., Song, X., Liu, B., Dai, G., Liu, J., Zhang, K., Qin, S., Hua, D.,
Gao, F., and Liu, L.: Mobile multi-wavelength polarization Raman lidar for
water vapor, cloud and aerosol measurement, Opt. Express, 23, 33870,
https://doi.org/10.1364/OE.23.033870, 2015.
Wylie, D., Jackson, D. L., Menzel, W. P., and Bates, J. J.: Trends in
Global Cloud Cover in Two Decades of HIRS Observations, J. Clim., 18, 3021–3031, https://doi.org/10.1175/JCLI3461.1, 2005.
Yang, Q., Fu, Q., and Hu, Y.: Radiative impacts of clouds in the tropical
tropopause layer, J. Geophys. Res.-Atmos., 115, https://doi.org/10.1029/2009JD012393,
2010.
Young, S. A.: Analysis of lidar backscatter profiles in optically thin
clouds, Appl. Optics, 34, 7019–7031, 1995.
Short summary
Multiple cirrus clouds frequently occur over regions of deep convection in the tropics. Tropical convection has a strong diurnal pattern, with peaks in the afternoon to early evening, over the continents. Continuous micropulse lidar observations over a coastal station in the Indian monsoon region enable us, for the first time, to demonstrate a robust diurnal pattern of single and multiple cirrus occurrences, with peaks during the late afternoon and early morning hours, respectively.
Multiple cirrus clouds frequently occur over regions of deep convection in the tropics. Tropical...
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