A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model
Abstract Because longwave (LW) absorption by greenhouse gases and clouds is more significant than the LW scattering effect by clouds, most climate models neglect cloud LW scattering to save computational costs. Ignoring cloud LW scattering directly overestimates outgoing longwave radiation (OLR). Th...
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American Geophysical Union (AGU)
2023
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ftdoajarticles:oai:doaj.org/article:bfd2d856bd9d486e848349977332140f 2023-12-10T09:46:05+01:00 A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model Chongxing Fan Yi‐Hsuan Chen Xiuhong Chen Wuyin Lin Ping Yang Xianglei Huang 2023-10-01T00:00:00Z https://doi.org/10.1029/2023MS003810 https://doaj.org/article/bfd2d856bd9d486e848349977332140f EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2023MS003810 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2023MS003810 https://doaj.org/article/bfd2d856bd9d486e848349977332140f Journal of Advances in Modeling Earth Systems, Vol 15, Iss 10, Pp n/a-n/a (2023) cloud longwave scattering cloud‐radiation interaction radiative forcing and feedback E3SM climate modeling Physical geography GB3-5030 Oceanography GC1-1581 article 2023 ftdoajarticles https://doi.org/10.1029/2023MS003810 2023-11-12T01:40:11Z Abstract Because longwave (LW) absorption by greenhouse gases and clouds is more significant than the LW scattering effect by clouds, most climate models neglect cloud LW scattering to save computational costs. Ignoring cloud LW scattering directly overestimates outgoing longwave radiation (OLR). This study included ice‐cloud LW scattering treatment in the Exascale Energy Earth System Model (E3SM) version 2 and ran fully‐coupled simulations, prescribed sea surface temperature simulations, and offline radiative transfer calculations to comprehensively assess the impact of ice‐cloud LW scattering on global climate simulation. The instantaneous effect due to ice‐cloud LW scattering reduces the OLR by ∼1 W/m2 on the global average and 2 W/m2 on the tropical average. Tropospheric warming and high cloud amount reduction act to partially compensate for such instantaneous OLR reduction caused by the inclusion of LW scattering. When the simulation reaches the equilibrium, the surface warms by 0.66 K on average with respect to the simulation without LW scattering, with the Arctic surface temperature differences more than twice as large as that of the global mean. The impact of including LW scattering on the simulated climate change in response to 4 × CO2 is also assessed. While including the cloud LW scattering does not significantly modify radiative forcing and total radiative feedback under such a scenario, it results in a 10% more positive cloud feedback. Article in Journal/Newspaper Arctic Climate change Directory of Open Access Journals: DOAJ Articles Arctic Journal of Advances in Modeling Earth Systems 15 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
cloud longwave scattering cloud‐radiation interaction radiative forcing and feedback E3SM climate modeling Physical geography GB3-5030 Oceanography GC1-1581 |
spellingShingle |
cloud longwave scattering cloud‐radiation interaction radiative forcing and feedback E3SM climate modeling Physical geography GB3-5030 Oceanography GC1-1581 Chongxing Fan Yi‐Hsuan Chen Xiuhong Chen Wuyin Lin Ping Yang Xianglei Huang A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model |
topic_facet |
cloud longwave scattering cloud‐radiation interaction radiative forcing and feedback E3SM climate modeling Physical geography GB3-5030 Oceanography GC1-1581 |
description |
Abstract Because longwave (LW) absorption by greenhouse gases and clouds is more significant than the LW scattering effect by clouds, most climate models neglect cloud LW scattering to save computational costs. Ignoring cloud LW scattering directly overestimates outgoing longwave radiation (OLR). This study included ice‐cloud LW scattering treatment in the Exascale Energy Earth System Model (E3SM) version 2 and ran fully‐coupled simulations, prescribed sea surface temperature simulations, and offline radiative transfer calculations to comprehensively assess the impact of ice‐cloud LW scattering on global climate simulation. The instantaneous effect due to ice‐cloud LW scattering reduces the OLR by ∼1 W/m2 on the global average and 2 W/m2 on the tropical average. Tropospheric warming and high cloud amount reduction act to partially compensate for such instantaneous OLR reduction caused by the inclusion of LW scattering. When the simulation reaches the equilibrium, the surface warms by 0.66 K on average with respect to the simulation without LW scattering, with the Arctic surface temperature differences more than twice as large as that of the global mean. The impact of including LW scattering on the simulated climate change in response to 4 × CO2 is also assessed. While including the cloud LW scattering does not significantly modify radiative forcing and total radiative feedback under such a scenario, it results in a 10% more positive cloud feedback. |
format |
Article in Journal/Newspaper |
author |
Chongxing Fan Yi‐Hsuan Chen Xiuhong Chen Wuyin Lin Ping Yang Xianglei Huang |
author_facet |
Chongxing Fan Yi‐Hsuan Chen Xiuhong Chen Wuyin Lin Ping Yang Xianglei Huang |
author_sort |
Chongxing Fan |
title |
A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model |
title_short |
A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model |
title_full |
A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model |
title_fullStr |
A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model |
title_full_unstemmed |
A Refined Understanding of the Ice Cloud Longwave Scattering Effects in Climate Model |
title_sort |
refined understanding of the ice cloud longwave scattering effects in climate model |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023MS003810 https://doaj.org/article/bfd2d856bd9d486e848349977332140f |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Journal of Advances in Modeling Earth Systems, Vol 15, Iss 10, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2023MS003810 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2023MS003810 https://doaj.org/article/bfd2d856bd9d486e848349977332140f |
op_doi |
https://doi.org/10.1029/2023MS003810 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
15 |
container_issue |
10 |
_version_ |
1784889398231302144 |