DOI: 10.1175/JCLI-D-15-0095.1
Scopus记录号: 2-s2.0-84982682901
论文题名: Factors controlling cloud albedo in marine subtropical stratocumulus regions in climate models and satellite observations
作者: Bender F.A.-M. ; Engström A. ; Karlsson J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 10 起始页码: 3559
结束页码: 3587
语种: 英语
Scopus关键词: Aerosols
; Clouds
; Drops
; Heat radiation
; Radiometry
; Reflection
; Satellites
; Solar radiation
; Cloud droplet number concentrations
; Cloud radiative properties
; Liquid water paths
; Marine stratocumulus clouds
; Radiative properties
; Satellite observations
; Spatial homogeneity
; Spatial variability
; Climate models
; albedo
; climate modeling
; cloud radiative forcing
; satellite data
; stratocumulus
; subtropical region
; temporal variation
英文摘要: This study focuses on the radiative properties of five subtropical marine stratocumulus cloud regions, on monthly mean scale. Through examination of the relation between total albedo and cloud fraction, and its variability and relation to other parameters, some of the factors controlling the reflectivity, or albedo, of theclouds in these regions are investigated. It is found that the main part of the variability in albedo at a given cloud fraction can be related to temporal rather than spatial variability, indicating spatial homogeneity in cloud radiative properties in the studied regions. This is seen most clearly in satellite observations but also appears in an ensemble of climate models. Further comparison between satellite data and output from climate models shows that there is good agreement with respect to the role of liquid water path, the parameter that can be assumed to be the primary source of variability in cloud reflectivity for a given cloud fraction. On the other hand, the influence of aerosol loading on cloud albedo differs between models and observations. The cloudalbedo effect, or cloud brightening caused by aerosol through its coupling to cloud droplet number concentration and droplet size, is found not to dominate in the satellite observations on monthly mean scale, as it appears to do on this scale in the climate models. The disagreement between models and observations is particularly strong in regions with frequent occurrence of absorbing aerosols above clouds, where satellite data, in contrast to the climate models, indicate a scene darkening with increasing aerosol loading. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50024
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Recommended Citation:
Bender F.A.-M.,Engström A.,Karlsson J.. Factors controlling cloud albedo in marine subtropical stratocumulus regions in climate models and satellite observations[J]. Journal of Climate,2016-01-01,29(10)