气候变化领域集成服务门户(CCPortal): A regime-oriented approach to observationally constraining extratropical shortwave cloud Feedbacks

CCPortal

DOI	10.1175/JCLI-D-19-0987.1
	A regime-oriented approach to observationally constraining extratropical shortwave cloud Feedbacks
	McCoy D.T.; Field P.; Bodas-Salcedo A.; Elsaesser G.S.; Zelinka M.D.
发表日期	2020
ISSN	0894-8755
起始页码	9967
结束页码	9983
卷号	33 期号:23
英文摘要	The extratropical shortwave (SW) cloud feedback is primarily due to increases in extratropical liquid cloud extent and optical depth. Here, we examine the response of extratropical (358–758) marine cloud liquid water path (LWP) to a uniform 4-K increase in sea surface temperature (SST) in global climate models (GCMs) from phase 5 of the Coupled Model Intercomparison Project (CMIP5) and variants of the HadGEM3-GC3.1 GCM. Compositing is used to partition data into periods inside and out of cyclones. The response of extratropical LWP to a uniform SST increase and associated atmospheric response varies substantially among GCMs, but the sensitivity of LWP to cloud controlling factors (CCFs) is qualitatively similar. When all other predictors are held constant, increasing moisture flux drives an increase in LWP. Increasing SST, holding all other predictors fixed, leads to a decrease in LWP. The combinations of these changes lead to LWP, and by extension reflected SW, increasing with warming in both hemispheres. Observations predict an increase in reflected SW over oceans of 0.8–1.6 W m22 per kelvin SST increase (358–758N) and 1.2–1.9 W m22 per kelvin SST increase (358–758S). This increase in reflected SW is mainly due to increased moisture convergence into cyclones because of increasing available moisture. The efficiency at which converging moisture is converted into precipitation determines the amount of liquid cloud. Thus, cyclone precipitation processes are critical to constraining extratropical cloud feedbacks. © 2020 American Meteorological Society.
英文关键词	Climate models; Digital storage; Liquids; Moisture; Oceanography; Storms; Surface waters; Atmospheric response; Cloud liquid water path; Controlling factors; Coupled Model Intercomparison Project; Global climate model; Moisture convergence; Precipitation process; Sea surface temperature (SST); Precipitation (meteorology); climate feedback; climate modeling; cloud cover; cloud microphysics; cloud radiative forcing; cyclone; extratropical environment; marine atmosphere; sea surface temperature; shortwave radiation
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171004
作者单位	Institute of Climate and Atmospheric Sciences, University of Leeds, Leeds, United Kingdom; Department of Atmospheric Science, University of Wyoming, Laramie, WY, United States; Met Office, Exeter, United Kingdom; Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Cloud Processes Research and Modeling Group, Lawrence Livermore National Laboratory, Livermore, CA, United States
推荐引用方式 GB/T 7714	McCoy D.T.,Field P.,Bodas-Salcedo A.,et al. A regime-oriented approach to observationally constraining extratropical shortwave cloud Feedbacks[J],2020,33(23).
APA	McCoy D.T.,Field P.,Bodas-Salcedo A.,Elsaesser G.S.,&Zelinka M.D..(2020).A regime-oriented approach to observationally constraining extratropical shortwave cloud Feedbacks.Journal of Climate,33(23).
MLA	McCoy D.T.,et al."A regime-oriented approach to observationally constraining extratropical shortwave cloud Feedbacks".Journal of Climate 33.23(2020).