Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2

Abstract The relationship between improvements in the radiation bias over the Southern Ocean and the alleviation of the double‐intertropical convergence zone (ITCZ) problem in the actual updates of our climate models is investigated. The radiation bias in MRI‐CGCM3 that was used for CMIP5 simulation...

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Autores principales:	Hideaki Kawai, Tsuyoshi Koshiro, Seiji Yukimoto
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	climate model cloud ITCZ Southern Ocean Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/2e8e4da5ea624ef1b9c03d62400b67ad
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spelling	oai:doaj.org-article:2e8e4da5ea624ef1b9c03d62400b67ad2021-12-01T20:00:12ZRelationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM21530-261X10.1002/asl.1064https://doaj.org/article/2e8e4da5ea624ef1b9c03d62400b67ad2021-12-01T00:00:00Zhttps://doi.org/10.1002/asl.1064https://doaj.org/toc/1530-261XAbstract The relationship between improvements in the radiation bias over the Southern Ocean and the alleviation of the double‐intertropical convergence zone (ITCZ) problem in the actual updates of our climate models is investigated. The radiation bias in MRI‐CGCM3 that was used for CMIP5 simulations, particularly over the Southern Ocean, is significantly reduced in MRI‐ESM2 that is used for CMIP6 simulations. Each modification that contributed to the reduction of the radiation bias was progressively reverted to the corresponding older treatment in order to examine their individual impacts on the ITCZ representation. Results show the double‐ITCZ problem worsens almost monotonically when the excessive shortwave insolation over the Southern Ocean increases. The contribution of the atmosphere is about one third of the impact on the total northward energy transport and the corresponding response of the Hadley cell is related to the change in the double‐ITCZ. However, our results also imply that the ITCZ bias cannot be completely resolved by the improvements of radiative flux alone and that there are other causes of the problem.Hideaki KawaiTsuyoshi KoshiroSeiji YukimotoWileyarticleclimate modelcloudITCZSouthern OceanMeteorology. ClimatologyQC851-999ENAtmospheric Science Letters, Vol 22, Iss 12, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	climate model cloud ITCZ Southern Ocean Meteorology. Climatology QC851-999
spellingShingle	climate model cloud ITCZ Southern Ocean Meteorology. Climatology QC851-999 Hideaki Kawai Tsuyoshi Koshiro Seiji Yukimoto Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2
description	Abstract The relationship between improvements in the radiation bias over the Southern Ocean and the alleviation of the double‐intertropical convergence zone (ITCZ) problem in the actual updates of our climate models is investigated. The radiation bias in MRI‐CGCM3 that was used for CMIP5 simulations, particularly over the Southern Ocean, is significantly reduced in MRI‐ESM2 that is used for CMIP6 simulations. Each modification that contributed to the reduction of the radiation bias was progressively reverted to the corresponding older treatment in order to examine their individual impacts on the ITCZ representation. Results show the double‐ITCZ problem worsens almost monotonically when the excessive shortwave insolation over the Southern Ocean increases. The contribution of the atmosphere is about one third of the impact on the total northward energy transport and the corresponding response of the Hadley cell is related to the change in the double‐ITCZ. However, our results also imply that the ITCZ bias cannot be completely resolved by the improvements of radiative flux alone and that there are other causes of the problem.
format	article
author	Hideaki Kawai Tsuyoshi Koshiro Seiji Yukimoto
author_facet	Hideaki Kawai Tsuyoshi Koshiro Seiji Yukimoto
author_sort	Hideaki Kawai
title	Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2
title_short	Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2
title_full	Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2
title_fullStr	Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2
title_full_unstemmed	Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2
title_sort	relationship between shortwave radiation bias over the southern ocean and the double‐intertropical convergence zone problem in mri‐esm2
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/2e8e4da5ea624ef1b9c03d62400b67ad
work_keys_str_mv	AT hideakikawai relationshipbetweenshortwaveradiationbiasoverthesouthernoceanandthedoubleintertropicalconvergencezoneprobleminmriesm2 AT tsuyoshikoshiro relationshipbetweenshortwaveradiationbiasoverthesouthernoceanandthedoubleintertropicalconvergencezoneprobleminmriesm2 AT seijiyukimoto relationshipbetweenshortwaveradiationbiasoverthesouthernoceanandthedoubleintertropicalconvergencezoneprobleminmriesm2
_version_	1718404563451510784

Relationship between shortwave radiation bias over the Southern Ocean and the double‐intertropical convergence zone problem in MRI‐ESM2

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