气候变化领域集成服务门户(CCPortal): Arctic Clouds and Precipitation in the Community Earth System Model Version 2

CCPortal

DOI	10.1029/2020JD032521
	Arctic Clouds and Precipitation in the Community Earth System Model Version 2
	McIlhattan E.A.; Kay J.E.; L'Ecuyer T.S.
发表日期	2020
ISSN	2169897X
卷号	125 期号:22
英文摘要	The Arctic climate is changing rapidly, warming at about twice the rate of the planet. Global climate models (GCMs) are invaluable tools both for understanding the drivers of these changes and predicting future Arctic climate evolution. While GCMs are continually improving, there remain difficulties in representing cloud processes which occur on scales smaller than GCM resolution. Since clouds influence the Arctic energy and water cycles, their accurate representation in models is critical for robust future projections. In this work, we examine the representation of Arctic clouds and precipitation in the Community Earth System Model (CESM) with the Community Atmosphere Model (CAM), comparing the newly released version (CESM2 with CAM6) with its predecessor (CESM1 with CAM5). To isolate changes in the Arctic mean state, we compare preindustrial control runs. Arctic cloud ice has decreased slightly, while cloud water has increased dramatically in CESM2. Annual mean liquid-containing cloud (LCC) frequency has increased from 19% in CESM1 to 51% in CESM2. Since LCCs strongly modulate downwelling radiation at the surface, their increase has led to an increase in mean downwelling longwave (+22 W m−2) and corresponding decrease in downwelling shortwave (−23 W m−2) radiation. The mean Arctic surface temperature increased from 257 K in CESM1 to 260 K in CESM2, with the largest seasonal difference in winter (+6 K). Annual average snowfall has decreased slightly (−1 mm month−1), while rainfall has increased (+5 mm month−1). ©2020. The Authors.
英文关键词	Arctic; CAM6; CESM2; clouds; precipitation
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185658
作者单位	Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, WI, United States; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States
推荐引用方式 GB/T 7714	McIlhattan E.A.,Kay J.E.,L'Ecuyer T.S.. Arctic Clouds and Precipitation in the Community Earth System Model Version 2[J],2020,125(22).
APA	McIlhattan E.A.,Kay J.E.,&L'Ecuyer T.S..(2020).Arctic Clouds and Precipitation in the Community Earth System Model Version 2.Journal of Geophysical Research: Atmospheres,125(22).
MLA	McIlhattan E.A.,et al."Arctic Clouds and Precipitation in the Community Earth System Model Version 2".Journal of Geophysical Research: Atmospheres 125.22(2020).