DOI: 10.1002/2016JD025246
论文题名: A multisatellite climatology of clouds, radiation, and precipitation in southern West Africa and comparison to climate models
作者: Hill P.G. ; Allan R.P. ; Chiu J.C. ; Stein T.H.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 18 起始页码: 10857
结束页码: 10879
语种: 英语
英文关键词: Africa
; clouds
; monsoon
; precipitation
; radiation
Scopus关键词: annual variation
; anthropogenic effect
; climate modeling
; climatology
; cloud cover
; convection
; diurnal variation
; energy budget
; monsoon
; net radiation
; precipitation (climatology)
; regional climate
; satellite imagery
; top of atmosphere
; West Africa
英文摘要: Southern West Africa (SWA) has a large population that relies on highly variable monsoon rainfall, yet climate models show little consensus over projected precipitation in this region. Understanding of the current and future climate of SWA is further complicated by rapidly increasing anthropogenic emissions and a lack of surface observations. Using multiple satellite observations, the ERA-Interim reanalysis, and four climate models, we document the climatology of cloud, precipitation, and radiation over SWA in June–July, highlight discrepancies among satellite products, and identify shortcomings in climate models and ERA-Interim. Large differences exist between monthly mean cloud cover estimates from satellites, which range from 68 to 94%. In contrast, differences among satellite observations in top of atmosphere outgoing radiation and surface precipitation are smaller, with monthly means of about 230 W m−2 of longwave radiation, 145 W m−2 of shortwave radiation, and 5.87 mm d−1 of precipitation. Both ERA-Interim and the climate models show less total cloud cover than observations, mainly due to underestimating low cloud cover. Errors in cloud cover, along with uncertainty in surface albedo, lead to a large spread of outgoing shortwave radiation. Both ERA-Interim and the climate models also show signs of convection developing too early in the diurnal cycle, with associated errors in the diurnal cycles of precipitation and outgoing longwave radiation. Clouds, radiation, and precipitation are linked in an analysis of the regional energy budget, which shows that interannual variability of precipitation and dry static energy divergence are strongly linked. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62829
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Hill P.G.,Allan R.P.,Chiu J.C.,et al. A multisatellite climatology of clouds, radiation, and precipitation in southern West Africa and comparison to climate models[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(18)