DOI: 10.1175/2011JCLI4183.1
Scopus记录号: 2-s2.0-84856954529
论文题名: Influence of twenty-first-century atmospheric and sea surface temperature forcing on West African climate
作者: Skinner C.B. ; Ashfaq M. ; Diffenbaugh N.S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 2 起始页码: 527
结束页码: 542
语种: 英语
Scopus关键词: Africa
; African easterly jet
; Atmospheric forcing
; Climate system
; Climate variability
; Global climate model
; Moisture balance
; Potential shift
; Radiative forcings
; Sea surface temperatures
; Summer precipitation
; Tropical easterly jets
; Twentieth century
; West Africa
; Atmospheric radiation
; Atmospheric temperature
; Atmospheric thermodynamics
; Climatology
; Drought
; Experiments
; Greenhouse gases
; Jets
; Precipitation (chemical)
; Atmospheric movements
; atmospheric moisture
; climate change
; climate modeling
; climate variation
; drought
; jet flow
; monsoon
; precipitation (climatology)
; radiative forcing
; sea surface temperature
; twenty first century
; westerly
; West Africa
英文摘要: The persistence of extended drought events throughout West Africa during the twentieth century has motivated a substantial effort to understand the mechanisms driving African climate variability as well as the possible response to elevated greenhouse gas (GHG) forcing. An ensemble of global climate model experiments is used to examine the relative roles of future direct atmospheric radiative forcing and SST forcing in shaping potential future changes in boreal summer precipitation over West Africa. The authors find that projected increases in precipitation throughout the western Sahel result primarily from direct atmospheric radiative forcing. The changes in atmospheric forcing generate a slight northward displacement and weakening of the African easterly jet (AEJ), a strengthening of westward monsoon flow onto West Africa, and an intensification of the tropical easterly jet (TEJ). Alternatively, the projected decreases in precipitation over much of the Guinea Coast region are caused by SST changes induced by the atmospheric radiative forcing. The changes in SSTs generate a weakening of the monsoon westerlies and the TEJ as well as a decrease in lowlevel convergence and resultant rising air throughout the midlevels of the troposphere. Experiments suggest a potential shift in the regional moisture balance of West Africa should global radiative forcing continue to increase, highlighting the importance of climate system feedbacks in shaping the response of regional-scale climate to global-scale changes in radiative forcing. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52579
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Earth System Science, Stanford University, Stanford, CA, United States; Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN, United States; Oak Ridge National Laboratory, Oak Ridge, TN, United States; Department of Earth and Atmospheric Sciences, Purdue Climate Change Research Center, Purdue University, West Lafayette, IN, United States; Department of Environmental Earth System Science, Woods Institute for the Environment, Stanford University, Stanford, CA, United States
Recommended Citation:
Skinner C.B.,Ashfaq M.,Diffenbaugh N.S.. Influence of twenty-first-century atmospheric and sea surface temperature forcing on West African climate[J]. Journal of Climate,2012-01-01,25(2)