气候变化领域集成服务门户(CCPortal): Observed sensitivity of low-cloud radiative effects to meteorological perturbations over the global oceans

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DOI	10.1175/JCLI-D-19-1028.1
	Observed sensitivity of low-cloud radiative effects to meteorological perturbations over the global oceans
	Scott R.C.; Myers T.A.; Norris J.R.; Zelinka M.D.; Klein S.A.; Sun M.; Doelling D.R.
发表日期	2020
ISSN	0894-8755
起始页码	7717
结束页码	7734
卷号	33 期号:18
英文摘要	Understanding how marine low clouds and their radiative effects respond to changing meteorological conditions is crucial to constrain low-cloud feedbacks to greenhouse warming and internal climate variability. In this study, we use observations to quantify the low-cloud radiative response to meteorological perturbations over the global oceans to shed light on physical processes governing low-cloud and planetary radiation budget variability in different climate regimes. We assess the independent effect of perturbations in sea surface temperature, estimated inversion strength, horizontal surface temperature advection, 700-hPa relative humidity, 700-hPa vertical velocity, and near-surface wind speed. Stronger inversions and stronger cold advection greatly enhance low-level cloudiness and planetary albedo in eastern ocean stratocumulus and midlatitude regimes. Warming of the sea surface drives pronounced reductions of eastern ocean stratocumulus cloud amount and optical depth, and hence reflectivity, but has a weaker and more variable impact on low clouds in the tropics and middle latitudes. By reducing entrainment drying, higher free-tropospheric relative humidity enhances low-level cloudiness. At low latitudes, where cold advection destabilizes the boundary layer, stronger winds enhance low-level cloudiness; by contrast, wind speed variations have weak influence at midlatitudes where warm advection frequently stabilizes the marine boundary layer, thus inhibiting vertical mixing. These observational constraints provide a framework for understanding and evaluating marine low-cloud feedbacks and their simulation by models. Ó 2020 American Meteorological Society.
英文关键词	Advection; Atmospheric temperature; Boundary layers; Budget control; Clouds; Surface properties; Surface waters; Wind; American meteorological societies; Cloud radiative effects; Internal climate variability; Marine boundary layers; Meteorological condition; Sea surface temperature (SST); Stratocumulus clouds; Wind speed variations; Oceanography; climate variation; cloud microphysics; cloud radiative forcing; computer simulation; numerical model; optical depth; perturbation; sensitivity analysis; stratocumulus; wind velocity
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/171128
作者单位	Scripps Institution of Oceanography, San diego, CA, United States; Lawrence Livermore National Laboratory, Livermore, CA, United States; Science Systems and Applications, Inc., Hampton, VA, United States; NASA Langley Research Center, Hampton, VA, United States
推荐引用方式 GB/T 7714	Scott R.C.,Myers T.A.,Norris J.R.,et al. Observed sensitivity of low-cloud radiative effects to meteorological perturbations over the global oceans[J],2020,33(18).
APA	Scott R.C..,Myers T.A..,Norris J.R..,Zelinka M.D..,Klein S.A..,...&Doelling D.R..(2020).Observed sensitivity of low-cloud radiative effects to meteorological perturbations over the global oceans.Journal of Climate,33(18).
MLA	Scott R.C.,et al."Observed sensitivity of low-cloud radiative effects to meteorological perturbations over the global oceans".Journal of Climate 33.18(2020).