DOI: 10.1175/JCLI-D-11-00072.1
Scopus记录号: 2-s2.0-84867670718
论文题名: The radiation budget of the West African Sahel and its controls: A perspective from observations and global climate models
作者: Miller M.A. ; Ghate V.P. ; Zahn R.K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 17 起始页码: 5976
结束页码: 5996
语种: 英语
Scopus关键词: Cloud forcing
; Diabatic heating
; Energy budgets
; Forcing
; Heat budget
; Irradiance
; Long-wave radiation
; Microwave observations
; Profilers
; Radiation budget
; Radiative effects
; Radiative fluxes
; Radiative forcings
; Satellite observations
; Short-wave radiation
; Soundings
; Surface observation
; Absorption
; Atmospheric radiation
; Atmospherics
; Climate change
; Climate models
; Clouds
; Fluxes
; Forecasting
; Geostationary satellites
; Heating
; Infrared radiation
; Radiative transfer
; Remote sensing
; Radiation effects
; climate modeling
; cloud radiative forcing
; longwave radiation
; radiation budget
; radiative transfer
; radiosonde
; remote sensing
; shortwave radiation
; Sahel [Sub-Saharan Africa]
英文摘要: Continuous measurements of the shortwave (SW), longwave (LW), and net cross-atmosphere radiation flux divergence over the West African Sahel were made during the year 2006 using the Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF) and the Geostationary Earth Radiation Budget (GERB) satellite. Accompanying AMF measurements enabled calculations of the LW, SW, and net top of the atmosphere (TOA) and surface cloud radiative forcing (CRF), which quantifies the radiative effects of cloud cover on the column boundaries. Calculations of the LW, SW, and net cloud radiative effect (CRE), which is the difference between the TOA and surface radiative flux divergences in all-sky and clear-sky conditions, quantify the radiative effects on the column itself. These measurements were compared to predictions in four global climate models (GCMs) used in the Intergovernmental Panel for Climate Change Fourth Assessment Report (IPCC AR4). All fourGCMs produced wet and dry seasons, but reproducing theSWcolumn radiative flux divergence was problematic in the GCMs and SW discrepancies translated into discrepancies in the net radiative flux divergence. Computing cloud-related quantities from the measurements produced yearly averages of the SW TOA CRF, surface CRF, and CRE of ~-19,-83, and 47 W m -2, respectively, and yearly averages of the LW TOA CRF, surface CRF, and CRE of ~39, 37, and 2 W m -2. These quantities were analyzed in two GCMs and compensating errors in the SW andLWclear-sky, cross-atmosphere radiative flux divergence were found to conspire to produce somewhat reasonable predictions of the net clear-sky divergence. Both GCMs underestimated the surface LW and SW CRF and predicted near-zero SW CRE when the measured values were substantially larger (~70 W m -2 maximum). © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52234
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, Rutgers University, The State University of New Jersey, New Brunswick, NJ, United States
Recommended Citation:
Miller M.A.,Ghate V.P.,Zahn R.K.. The radiation budget of the West African Sahel and its controls: A perspective from observations and global climate models[J]. Journal of Climate,2012-01-01,25(17)