气候变化领域集成服务门户(CCPortal): Toward a consistent definition between satellite and model clear-sky radiative fluxes

CCPortal

DOI	10.1175/JCLI-D-19-0381.1
	Toward a consistent definition between satellite and model clear-sky radiative fluxes
	Loeb N.G.; Rose F.G.; Kato S.; Rutan D.A.; Su W.; Wang H.; Doelling D.R.; Smith W.L.; Gettelman A.
发表日期	2020
ISSN	0894-8755
起始页码	61
结束页码	75
卷号	33 期号:1
英文摘要	A new method of determining clear-sky radiative fluxes from satellite observations for climate model evaluation is presented. The method consists of applying adjustment factors to existing satellite clear-sky broadband radiative fluxes that make the observed and simulated clear-sky flux definitions more consistent. The adjustment factors are determined from the difference between observation-based radiative transfer model calculations of monthly mean clear-sky fluxes obtained by ignoring clouds in the atmospheric column and by weighting hourly mean clear-sky fluxes with imager-based clear-area fractions. The global mean longwave (LW) adjustment factor is -2.2 W m-2 at the top of the atmosphere and 2.7 W m-2 at the surface. The LW adjustment factors are pronounced at high latitudes during winter and in regions with high uppertropospheric humidity and cirrus cloud cover, such as over the west tropical Pacific, and the South Pacific and intertropical convergence zones. In the shortwave (SW), global mean adjustment is 0.5 W m-2 at TOA and -1.9 W m-2 at the surface. It is most pronounced over sea ice off of Antarctica and over heavy aerosol regions, such as eastern China. However, interannual variations in the regional SW and LW adjustment factors are small compared to those in cloud radiative effect. After applying the LW adjustment factors, differences in zonal mean cloud radiative effect between observations and climate models decrease markedly between 60°S and 60°N and poleward of 65°N. The largest regional improvements occur over the west tropical Pacific and Indian Oceans. In contrast, the impact of the SW adjustment factors is much smaller. © 2019 American Meteorological Society.
英文关键词	Atmospheric humidity; Clouds; Radiative transfer; Satellites; Sea ice; Tropics; Adjustment factors; Atmospheric columns; Cloud radiative effects; Interannual variation; Intertropical convergence zone; Radiative transfer model; Satellite observations; Top of the atmospheres; Climate models; annual variation; clear sky; climate modeling; cloud radiative forcing; radiation budget; radiative transfer; satellite; Pacific Ocean; Pacific Ocean (South); Pacific Ocean (Tropical)
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/171550
作者单位	NASA Langley Research Center, Hampton, VA, United States; Science Systems and Applications, Inc., Hampton, VA, United States; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Loeb N.G.,Rose F.G.,Kato S.,et al. Toward a consistent definition between satellite and model clear-sky radiative fluxes[J],2020,33(1).
APA	Loeb N.G..,Rose F.G..,Kato S..,Rutan D.A..,Su W..,...&Gettelman A..(2020).Toward a consistent definition between satellite and model clear-sky radiative fluxes.Journal of Climate,33(1).
MLA	Loeb N.G.,et al."Toward a consistent definition between satellite and model clear-sky radiative fluxes".Journal of Climate 33.1(2020).