气候变化领域集成服务门户(CCPortal): Arctic and Antarctic Sea Ice Mean State in the Community Earth System Model Version 2 and the Influence of Atmospheric Chemistry

CCPortal

DOI	10.1029/2019JC015934
	Arctic and Antarctic Sea Ice Mean State in the Community Earth System Model Version 2 and the Influence of Atmospheric Chemistry
	DuVivier A.K.; Holland M.M.; Kay J.E.; Tilmes S.; Gettelman A.; Bailey D.A.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	Arctic and Antarctic sea ice has undergone significant and rapid change with the changing climate. Here, we present preindustrial and historical results from the newly released Community Earth System Model Version 2 (CESM2) to assess the Arctic and Antarctic sea ice. Two configurations of the CESM2 are available that differ only in their atmospheric model top and the inclusion of comprehensive atmospheric chemistry, including prognostic aerosols. The CESM2 configuration with comprehensive atmospheric chemistry has significantly thicker Arctic sea ice year-round and better captures decreasing trends in sea ice extent and volume over the satellite period. In the Antarctic, both CESM configurations have similar mean state ice extent and volume, but the ice extent trends are opposite to satellite observations. We find that differences in the Arctic sea ice between CESM2 configurations are the result of differences in liquid clouds. Over the Arctic, the CESM2 configuration without prognostic aerosol formation has fewer aerosols to form cloud condensation nuclei, leading to thinner liquid clouds. As a result, the sea ice receives much more shortwave radiation early in the melt season, driving a stronger ice albedo feedback and leading to additional sea ice loss and significantly thinner ice year-round. The aerosols necessary for the Arctic liquid cloud formation are produced from different precursor emissions and transported to the Arctic. Thus, the main reason sea ice differs in the Arctic is the transport of cloud-impacting aerosols into the region, while the Antarctic remains relatively pristine from extrapolar aerosol transport. ©2020. The Authors.
英文关键词	albedo; Antarctic; Arctic; climate model; clouds; sea ice
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186710
作者单位	National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences and Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	DuVivier A.K.,Holland M.M.,Kay J.E.,et al. Arctic and Antarctic Sea Ice Mean State in the Community Earth System Model Version 2 and the Influence of Atmospheric Chemistry[J],2020,125(8).
APA	DuVivier A.K.,Holland M.M.,Kay J.E.,Tilmes S.,Gettelman A.,&Bailey D.A..(2020).Arctic and Antarctic Sea Ice Mean State in the Community Earth System Model Version 2 and the Influence of Atmospheric Chemistry.Journal of Geophysical Research: Oceans,125(8).
MLA	DuVivier A.K.,et al."Arctic and Antarctic Sea Ice Mean State in the Community Earth System Model Version 2 and the Influence of Atmospheric Chemistry".Journal of Geophysical Research: Oceans 125.8(2020).