DOI: 10.1175/JCLI-D-16-0263.1
Scopus记录号: 2-s2.0-85019070992
论文题名: Evaluation of hemispheric asymmetries in marine cloud radiative properties
作者: Bender F.A.-M. ; Engström A. ; Wood R. ; Charlson R.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 11 起始页码: 4131
结束页码: 4147
语种: 英语
Scopus关键词: Clouds
; Plasma diagnostics
; Solar radiation
; Tropics
; Albedo
; Annual variations
; Cloud radiative properties
; Global climate model
; Hemi-spheric asymmetries
; Model comparison
; Model-data comparisons
; Satellite observations
; Climate models
英文摘要: The hemispheric symmetry of albedo and its contributing factors in satellite observations and global climate models is evaluated. The analysis is performed on the annual mean time scale, on which a bimodality in the joint distribution of albedo and cloud fraction is evident, resulting from tropical and subtropical clouds and midlatitude clouds, respectively. Hemispheric albedo symmetry is not found in individual ocean-only latitude bands; comparing the Northern and Southern Hemisphere (NH and SH), regional mean albedo is higher in the NH tropics and lower in the NH subtropics and midlatitudes than in the SH counterparts. This follows the hemispheric asymmetry of cloud fraction. In midlatitudes and tropics the hemispheric asymmetry in cloud albedo also contributes to the asymmetry in total albedo, whereas in the subtropics the cloud albedo is more hemispherically symmetric. According to the observations, cloud contributions to compensation for higher clear-sky albedo in the NH come primarily from cloud albedo in midlatitudes and cloud amount in the subtropics. Current-generation climate models diverge in their representation of these relationships, but common features of the model-data comparison include weaker-than-observed asymmetry in cloud fraction and cloud albedo in the tropics, weaker or reversed cloud fraction asymmetry in the subtropics, and agreement with observed cloud albedo asymmetry in the midlatitudes. Models on average reproduce the NH-SH asymmetry in total albedo over the 60°S-60°N ocean but show higher occurrence of brighter clouds in the SH compared to observations. The albedo bias in both hemispheres is reinforced by overestimated clear-sky albedo in the models. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49650
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Atmospheric Science, University of Washington, Seattle, WA, United States
Recommended Citation:
Bender F.A.-M.,Engström A.,Wood R.,et al. Evaluation of hemispheric asymmetries in marine cloud radiative properties[J]. Journal of Climate,2017-01-01,30(11)