气候变化领域集成服务门户(CCPortal): Clouds damp the radiative impacts of polar sea ice loss

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DOI	10.5194/tc-14-2673-2020
	Clouds damp the radiative impacts of polar sea ice loss
	Alkama R.; Taylor P.C.; Garcia-San Martin L.; Douville H.; Duveiller G.; Forzieri G.; Swingedouw D.; Cescatti A.
发表日期	2020
ISSN	19940416
起始页码	2673
结束页码	2686
卷号	14 期号:8
英文摘要	Clouds play an important role in the climate system: (1) cooling Earth by reflecting incoming sunlight to space and (2) warming Earth by reducing thermal energy loss to space. Cloud radiative effects are especially important in polar regions and have the potential to significantly alter the impact of sea ice decline on the surface radiation budget. Using CERES (Clouds and the Earth's Radiant Energy System) data and 32 CMIP5 (Coupled Model Intercomparison Project) climate models, we quantify the influence of polar clouds on the radiative impact of polar sea ice variability. Our results show that the cloud short-wave cooling effect strongly influences the impact of sea ice variability on the surface radiation budget and does so in a counter-intuitive manner over the polar seas: years with less sea ice and a larger net surface radiative flux show a more negative cloud radiative effect. Our results indicate that 66 ± 2% of this change in the net cloud radiative effect is due to the reduction in surface albedo and that the remaining 34±1 % is due to an increase in cloud cover and optical thickness. The overall cloud radiative damping effect is 56 ± 2 % over the Antarctic and 47 ± 3 % over the Arctic. Thus, present-day cloud properties significantly reduce the net radiative impact of sea ice loss on the Arctic and Antarctic surface radiation budgets. As a result, climate models must accurately represent present-day polar cloud properties in order to capture the surface radiation budget impact of polar sea ice loss and thus the surface albedo feedback. © 2020 Author(s).
英文关键词	cloud; polar region; radiative forcing; sea ice
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202015
作者单位	European Commission-Joint Research Centre, Via Enrico Fermi, 2749, Ispra (VA), 21027, Italy; Nasa Langley Research Center, Hampton, VA, United States; Centre National de Recherches Météorologiques, Météo-France/CNRS, Toulouse, France; Epoc, Université de Bordeaux, Allée Geoffroy Saint-Hilaire, Pessac, 33615, France
推荐引用方式 GB/T 7714	Alkama R.,Taylor P.C.,Garcia-San Martin L.,et al. Clouds damp the radiative impacts of polar sea ice loss[J],2020,14(8).
APA	Alkama R..,Taylor P.C..,Garcia-San Martin L..,Douville H..,Duveiller G..,...&Cescatti A..(2020).Clouds damp the radiative impacts of polar sea ice loss.Cryosphere,14(8).
MLA	Alkama R.,et al."Clouds damp the radiative impacts of polar sea ice loss".Cryosphere 14.8(2020).