气候变化领域集成服务门户(CCPortal): The climate response to increased cloud liquid water over the Arctic in CESM1: a sensitivity study of Wegener–Bergeron

CCPortal

DOI	10.1007/s00382-021-05648-5
	The climate response to increased cloud liquid water over the Arctic in CESM1: a sensitivity study of Wegener–Bergeron–Findeisen process
	Huang Y.; Dong X.; Kay J.E.; Xi B.; McIlhattan E.A.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-09-10
英文摘要	The surface radiative imbalance has large impacts on the long-term trends and year-to-year variability of Arctic sea ice. Clouds are believed to be a key factor in regulating this radiative imbalance, whose underlying processes and mechanisms, however, are not well understood. Compared with observations, the Community Earth System Model version 1 (CESM1) is known to underestimate Arctic cloud liquid water. Here, the following hypothesis is proposed and tested: this underestimation is caused by an overactive Wegener–Bergeron–Findeisen (WBF) process in model as too many supercooled liquid droplets are scavenged by ice crystals via deposition. In this study, the efficiency of the WBF process in CESM1 was reduced to investigate the Arctic climate response, and differentiate the responses induced by atmosphere–ocean–sea ice coupling and global warming. By weakening the WBF process, CESM1 simulated liquid cloud fractions increased, especially in winter and spring. The cloud response resulted in increased downwelling longwave flux and decreased shortwave flux at the surface. Arctic clouds and radiation in simulations with reduced WBF efficiency show a better agreement with satellite retrievals. In addition, both coupling and global warming amplify the cloud response to a less efficient WBF process, due to increased relative humidity and enhanced evaporation, respectively. As a response, the sea ice tends to melt over the North Atlantic Ocean, most likely caused by a positive feedback process between clouds, radiation and sea ice during non-summer months. These results improve our understanding of large-scale effects of the WBF process and the role of cloud liquid water in the Arctic climate system. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
英文关键词	Arctic sea ice; Cloud and radiation; Community earth system model; Wegener–Bergeron–Findeisen process
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183294
作者单位	Department of Hydrology and Atmospheric Sciences, University of Arizona, 1133 E. James Rogers Way, PO Box 210011, Tucson, AZ 85721-0011, United States; Department of Atmospheric and Oceanic Sciences, Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, WI, United States
推荐引用方式 GB/T 7714	Huang Y.,Dong X.,Kay J.E.,等. The climate response to increased cloud liquid water over the Arctic in CESM1: a sensitivity study of Wegener–Bergeron–Findeisen process[J],2021,56(2021-09-10).
APA	Huang Y.,Dong X.,Kay J.E.,Xi B.,&McIlhattan E.A..(2021).The climate response to increased cloud liquid water over the Arctic in CESM1: a sensitivity study of Wegener–Bergeron–Findeisen process.Climate Dynamics,56(2021-09-10).
MLA	Huang Y.,et al."The climate response to increased cloud liquid water over the Arctic in CESM1: a sensitivity study of Wegener–Bergeron–Findeisen process".Climate Dynamics 56.2021-09-10(2021).