Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project
Abstract Aerosols significantly affect cloud microphysics and energy budget in different ways. The contribution of the direct, semi‐direct, and indirect effects of aerosols on radiation are here investigated over the North Atlantic tropical ocean under different aerosol loadings. The Weather Researc...
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Online Access: | http://dx.doi.org/10.1002/asl.1208 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl.1208 |
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crwiley:10.1002/asl.1208 2024-06-02T08:11:32+00:00 Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project Tartaglione, Nazario Desbiolles, Fabien del Moral‐Méndez, Anna Meroni, Agostino N. Napoli, Anna Borgnino, Matteo Parodi, Antonio Pasquero, Claudia 2024 http://dx.doi.org/10.1002/asl.1208 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl.1208 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Atmospheric Science Letters volume 25, issue 5 ISSN 1530-261X 1530-261X journal-article 2024 crwiley https://doi.org/10.1002/asl.1208 2024-05-06T07:05:25Z Abstract Aerosols significantly affect cloud microphysics and energy budget in different ways. The contribution of the direct, semi‐direct, and indirect effects of aerosols on radiation are here investigated over the North Atlantic tropical ocean under different aerosol loadings. The Weather Research and Forecasting Model is used to perform a set of numerical idealized experiments, which are forced with prescribed aerosol profiles. We evaluate the effects of aerosols on modeled shallow clouds and surface radiative budget. The results indicate that large aerosol loadings are associated with enhanced cloudiness and reduced precipitation. While the change in rainfall is mainly due to the larger number of smaller droplets, the change in cloudiness is attributed to the effects of absorbing aerosols, mainly dust particles, which are responsible for a rise of temperature that feeds back onto specific humidity. As in the boundary layer the increase of moisture dominates, the net effect is a higher relative humidity, which favors the formation of thin low non‐precipitating clouds. The feedback accounts for a dynamical change in the lower troposphere: shortwave radiation absorption increases temperature at the top of the marine atmospheric boundary‐layer and reduces entrainment of warm and dry air, increasing low level moisture content. Despite the overall increase in cloudiness, daytime cloud cover is reduced. The semi‐direct effect of aerosols on clouds results in a warming of the surface, opposite to the indirect effect. Article in Journal/Newspaper North Atlantic Wiley Online Library Atmospheric Science Letters |
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Open Polar |
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Wiley Online Library |
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language |
English |
description |
Abstract Aerosols significantly affect cloud microphysics and energy budget in different ways. The contribution of the direct, semi‐direct, and indirect effects of aerosols on radiation are here investigated over the North Atlantic tropical ocean under different aerosol loadings. The Weather Research and Forecasting Model is used to perform a set of numerical idealized experiments, which are forced with prescribed aerosol profiles. We evaluate the effects of aerosols on modeled shallow clouds and surface radiative budget. The results indicate that large aerosol loadings are associated with enhanced cloudiness and reduced precipitation. While the change in rainfall is mainly due to the larger number of smaller droplets, the change in cloudiness is attributed to the effects of absorbing aerosols, mainly dust particles, which are responsible for a rise of temperature that feeds back onto specific humidity. As in the boundary layer the increase of moisture dominates, the net effect is a higher relative humidity, which favors the formation of thin low non‐precipitating clouds. The feedback accounts for a dynamical change in the lower troposphere: shortwave radiation absorption increases temperature at the top of the marine atmospheric boundary‐layer and reduces entrainment of warm and dry air, increasing low level moisture content. Despite the overall increase in cloudiness, daytime cloud cover is reduced. The semi‐direct effect of aerosols on clouds results in a warming of the surface, opposite to the indirect effect. |
format |
Article in Journal/Newspaper |
author |
Tartaglione, Nazario Desbiolles, Fabien del Moral‐Méndez, Anna Meroni, Agostino N. Napoli, Anna Borgnino, Matteo Parodi, Antonio Pasquero, Claudia |
spellingShingle |
Tartaglione, Nazario Desbiolles, Fabien del Moral‐Méndez, Anna Meroni, Agostino N. Napoli, Anna Borgnino, Matteo Parodi, Antonio Pasquero, Claudia Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project |
author_facet |
Tartaglione, Nazario Desbiolles, Fabien del Moral‐Méndez, Anna Meroni, Agostino N. Napoli, Anna Borgnino, Matteo Parodi, Antonio Pasquero, Claudia |
author_sort |
Tartaglione, Nazario |
title |
Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project |
title_short |
Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project |
title_full |
Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project |
title_fullStr |
Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project |
title_full_unstemmed |
Low cloud response to aerosol‐radiation‐cloud interactions: Idealized WRF numerical experiments for EUREC 4 A project |
title_sort |
low cloud response to aerosol‐radiation‐cloud interactions: idealized wrf numerical experiments for eurec 4 a project |
publisher |
Wiley |
publishDate |
2024 |
url |
http://dx.doi.org/10.1002/asl.1208 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/asl.1208 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Science Letters volume 25, issue 5 ISSN 1530-261X 1530-261X |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/asl.1208 |
container_title |
Atmospheric Science Letters |
_version_ |
1800757716380024832 |