Better representation of dust can improve climate models with too weak an African monsoon
International audience The amount of short wave radiation absorbed by dust has remained uncertain. We have developed a more accurate representation of dust absorption that is based on the observed dust mineralogical composition and accounts for very large particles. We analyze the results from two f...
Published in: | Atmospheric Chemistry and Physics |
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Online Access: | https://hal.science/hal-03317882 https://hal.science/hal-03317882/document https://hal.science/hal-03317882/file/acp-21-11423-2021.pdf https://doi.org/10.5194/acp-21-11423-2021 |
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ftceafr:oai:HAL:hal-03317882v1 2024-09-15T18:23:33+00:00 Better representation of dust can improve climate models with too weak an African monsoon Balkanski, Yves Bonnet, Rémy Boucher, Olivier Checa-Garcia, Ramiro Servonnat, Jérôme Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ANR-17-EQPX-0001,Plan d'évolution des moyens de stockage,Plan d'évolution des moyens de stockage(2017) 2021-07-30 https://hal.science/hal-03317882 https://hal.science/hal-03317882/document https://hal.science/hal-03317882/file/acp-21-11423-2021.pdf https://doi.org/10.5194/acp-21-11423-2021 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-21-11423-2021 hal-03317882 https://hal.science/hal-03317882 https://hal.science/hal-03317882/document https://hal.science/hal-03317882/file/acp-21-11423-2021.pdf doi:10.5194/acp-21-11423-2021 info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-03317882 Atmospheric Chemistry and Physics, 2021, 21 (14), pp.11423 - 11435. ⟨10.5194/acp-21-11423-2021⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2021 ftceafr https://doi.org/10.5194/acp-21-11423-2021 2024-07-22T13:14:39Z International audience The amount of short wave radiation absorbed by dust has remained uncertain. We have developed a more accurate representation of dust absorption that is based on the observed dust mineralogical composition and accounts for very large particles. We analyze the results from two fully coupled climate simulations of 100 years in terms of their simulated precipitation patterns against observations. A striking benefit of the new dust optical and physical properties is that tropical precipitation over the Sahel, tropical North Atlantic and West Indian Ocean are significantly improved compared to observations, without degrading precipitations elsewhere. This alleviates a common persistent bias in Earth system models that exhibit a summer African monsoon that does not reach far enough north. We show that the improvements documented here for the IPSL-CM6 1 climate model result from both a thermodynamical and dynamical response to dust absorption, which is unrelated to natural variability. Aerosol absorption induces more water vapor advection from the ocean to the Sahel region, thereby providing an added supply of moisture available for precipitation. This work, thus, provides a path towards improving precipitation patterns in these regions by accounting for both physical and optical properties of the aerosol more realistically. Article in Journal/Newspaper North Atlantic HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Atmospheric Chemistry and Physics 21 14 11423 11435 |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Balkanski, Yves Bonnet, Rémy Boucher, Olivier Checa-Garcia, Ramiro Servonnat, Jérôme Better representation of dust can improve climate models with too weak an African monsoon |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience The amount of short wave radiation absorbed by dust has remained uncertain. We have developed a more accurate representation of dust absorption that is based on the observed dust mineralogical composition and accounts for very large particles. We analyze the results from two fully coupled climate simulations of 100 years in terms of their simulated precipitation patterns against observations. A striking benefit of the new dust optical and physical properties is that tropical precipitation over the Sahel, tropical North Atlantic and West Indian Ocean are significantly improved compared to observations, without degrading precipitations elsewhere. This alleviates a common persistent bias in Earth system models that exhibit a summer African monsoon that does not reach far enough north. We show that the improvements documented here for the IPSL-CM6 1 climate model result from both a thermodynamical and dynamical response to dust absorption, which is unrelated to natural variability. Aerosol absorption induces more water vapor advection from the ocean to the Sahel region, thereby providing an added supply of moisture available for precipitation. This work, thus, provides a path towards improving precipitation patterns in these regions by accounting for both physical and optical properties of the aerosol more realistically. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ANR-17-EQPX-0001,Plan d'évolution des moyens de stockage,Plan d'évolution des moyens de stockage(2017) |
format |
Article in Journal/Newspaper |
author |
Balkanski, Yves Bonnet, Rémy Boucher, Olivier Checa-Garcia, Ramiro Servonnat, Jérôme |
author_facet |
Balkanski, Yves Bonnet, Rémy Boucher, Olivier Checa-Garcia, Ramiro Servonnat, Jérôme |
author_sort |
Balkanski, Yves |
title |
Better representation of dust can improve climate models with too weak an African monsoon |
title_short |
Better representation of dust can improve climate models with too weak an African monsoon |
title_full |
Better representation of dust can improve climate models with too weak an African monsoon |
title_fullStr |
Better representation of dust can improve climate models with too weak an African monsoon |
title_full_unstemmed |
Better representation of dust can improve climate models with too weak an African monsoon |
title_sort |
better representation of dust can improve climate models with too weak an african monsoon |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03317882 https://hal.science/hal-03317882/document https://hal.science/hal-03317882/file/acp-21-11423-2021.pdf https://doi.org/10.5194/acp-21-11423-2021 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-03317882 Atmospheric Chemistry and Physics, 2021, 21 (14), pp.11423 - 11435. ⟨10.5194/acp-21-11423-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-21-11423-2021 hal-03317882 https://hal.science/hal-03317882 https://hal.science/hal-03317882/document https://hal.science/hal-03317882/file/acp-21-11423-2021.pdf doi:10.5194/acp-21-11423-2021 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-21-11423-2021 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
21 |
container_issue |
14 |
container_start_page |
11423 |
op_container_end_page |
11435 |
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1810463783712194560 |