DOI: 10.5194/tc-14-2673-2020
论文题名: Clouds damp the radiative impacts of polar sea ice loss
作者: Alkama R. ; Taylor P.C. ; Garcia-San Martin L. ; Douville H. ; Duveiller G. ; Forzieri G. ; Swingedouw D. ; Cescatti A.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 8 起始页码: 2673
结束页码: 2686
语种: 英语
英文关键词: cloud
; polar region
; radiative forcing
; sea ice
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164393
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Alkama R.,Taylor P.C.,Garcia-San Martin L.,et al. Clouds damp the radiative impacts of polar sea ice loss[J]. Cryosphere,2020-01-01,14(8)