Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic
Warm boundary layer clouds in the eastern North Atlantic region exhibit significant diurnal variations in cloud properties. However, the diurnal cycle of the aerosol indirect effect (AIE) for these clouds remains poorly understood. This study takes advantage of recent advancements in the spatial res...
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Online Access: | https://doi.org/10.5194/acp-24-2913-2024 https://acp.copernicus.org/articles/24/2913/2024/ |
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ftcopernicus:oai:publications.copernicus.org:acp113420 2024-06-23T07:55:05+00:00 Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic Qiu, Shaoyue Zheng, Xue Painemal, David Terai, Christopher R. Zhou, Xiaoli 2024-03-06 application/pdf https://doi.org/10.5194/acp-24-2913-2024 https://acp.copernicus.org/articles/24/2913/2024/ eng eng doi:10.5194/acp-24-2913-2024 https://acp.copernicus.org/articles/24/2913/2024/ eISSN: 1680-7324 Text 2024 ftcopernicus https://doi.org/10.5194/acp-24-2913-2024 2024-06-13T01:23:50Z Warm boundary layer clouds in the eastern North Atlantic region exhibit significant diurnal variations in cloud properties. However, the diurnal cycle of the aerosol indirect effect (AIE) for these clouds remains poorly understood. This study takes advantage of recent advancements in the spatial resolution of geostationary satellites to explore the daytime variation in the AIE by estimating the cloud susceptibilities to changes in cloud droplet number concentration ( N d ). Cloud retrievals for the month of July over 4 years (2018–2021) from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) on Meteosat-11 over this region are analyzed. Our results reveal a significant “U-shaped” daytime cycle in susceptibilities of the cloud liquid water path (LWP), cloud albedo, and cloud fraction. Clouds are found to be more susceptible to N d perturbations at noon and less susceptible in the morning and evening. The magnitude and sign of cloud susceptibilities depend heavily on the cloud state defined by cloud LWP and precipitation conditions. Non-precipitating thin clouds account for 44 % of all warm boundary layer clouds in July, and they contribute the most to the observed daytime variation. Non-precipitating thick clouds are the least frequent cloud state (10 %), and they exhibit more negative LWP and albedo susceptibilities compared to thin clouds. Precipitating clouds are the dominant cloud state (46 %), but their cloud susceptibilities show minimal variation throughout the day. We find evidence that the daytime variation in LWP and albedo susceptibilities for non-precipitating clouds is influenced by a combination of the diurnal transition between non-precipitating thick and thin clouds and the “lagged” cloud responses to N d perturbations. The daytime variation in cloud fraction susceptibility for non-precipitating thick clouds can be attributed to the daytime variation in cloud morphology (e.g., overcast or broken). The dissipation and development of clouds do not adequately explain the observed variation in ... Text North Atlantic Copernicus Publications: E-Journals Atmospheric Chemistry and Physics 24 5 2913 2935 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Warm boundary layer clouds in the eastern North Atlantic region exhibit significant diurnal variations in cloud properties. However, the diurnal cycle of the aerosol indirect effect (AIE) for these clouds remains poorly understood. This study takes advantage of recent advancements in the spatial resolution of geostationary satellites to explore the daytime variation in the AIE by estimating the cloud susceptibilities to changes in cloud droplet number concentration ( N d ). Cloud retrievals for the month of July over 4 years (2018–2021) from the Spinning Enhanced Visible and Infrared Imager (SEVIRI) on Meteosat-11 over this region are analyzed. Our results reveal a significant “U-shaped” daytime cycle in susceptibilities of the cloud liquid water path (LWP), cloud albedo, and cloud fraction. Clouds are found to be more susceptible to N d perturbations at noon and less susceptible in the morning and evening. The magnitude and sign of cloud susceptibilities depend heavily on the cloud state defined by cloud LWP and precipitation conditions. Non-precipitating thin clouds account for 44 % of all warm boundary layer clouds in July, and they contribute the most to the observed daytime variation. Non-precipitating thick clouds are the least frequent cloud state (10 %), and they exhibit more negative LWP and albedo susceptibilities compared to thin clouds. Precipitating clouds are the dominant cloud state (46 %), but their cloud susceptibilities show minimal variation throughout the day. We find evidence that the daytime variation in LWP and albedo susceptibilities for non-precipitating clouds is influenced by a combination of the diurnal transition between non-precipitating thick and thin clouds and the “lagged” cloud responses to N d perturbations. The daytime variation in cloud fraction susceptibility for non-precipitating thick clouds can be attributed to the daytime variation in cloud morphology (e.g., overcast or broken). The dissipation and development of clouds do not adequately explain the observed variation in ... |
format |
Text |
author |
Qiu, Shaoyue Zheng, Xue Painemal, David Terai, Christopher R. Zhou, Xiaoli |
spellingShingle |
Qiu, Shaoyue Zheng, Xue Painemal, David Terai, Christopher R. Zhou, Xiaoli Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic |
author_facet |
Qiu, Shaoyue Zheng, Xue Painemal, David Terai, Christopher R. Zhou, Xiaoli |
author_sort |
Qiu, Shaoyue |
title |
Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic |
title_short |
Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic |
title_full |
Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic |
title_fullStr |
Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic |
title_full_unstemmed |
Daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern North Atlantic |
title_sort |
daytime variation in the aerosol indirect effect for warm marine boundary layer clouds in the eastern north atlantic |
publishDate |
2024 |
url |
https://doi.org/10.5194/acp-24-2913-2024 https://acp.copernicus.org/articles/24/2913/2024/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-24-2913-2024 https://acp.copernicus.org/articles/24/2913/2024/ |
op_doi |
https://doi.org/10.5194/acp-24-2913-2024 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
24 |
container_issue |
5 |
container_start_page |
2913 |
op_container_end_page |
2935 |
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1802647503324053504 |