DOI: 10.1007/s00382-014-2382-3
Scopus记录号: 2-s2.0-84939965509
论文题名: Moisture budget analysis of SST-driven decadal Sahel precipitation variability in the twentieth century
作者: Pomposi C. ; Kushnir Y. ; Giannini A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-11-12 起始页码: 3303
结束页码: 3321
语种: 英语
英文关键词: Atmospheric moisture budget
; Monsoon
; Sahel precipitation
; Sea surface temperatures
英文摘要: It is well known that the Sahel region of Africa is impacted by decadal scale variability in precipitation, driven by global sea surface temperatures. This work demonstrates that the National Center for Atmospheric Research’s Community Atmosphere Model, version 4 is capable of reproducing relationships between Sahelian precipitation variability and Indian and Atlantic Ocean sea surface temperature variations on such timescales. Further analysis then constructs a moisture budget breakdown using model output and shows that the change in precipitation minus evaporation in the region is dominated by column integrated moisture convergence due to the mean flow, with the convergence of mass in the atmospheric column mainly responsible. It is concluded that the oceanic forcing of atmospheric mass convergence and divergence to a first order explains the moisture balance patterns in the region. In particular, the anomalous circulation patterns, including net moisture divergence by the mean and transient flows combined with negative moisture advection, together explain the drying of the Sahel during the second half of the twentieth century. Diagnosis of moisture budget and circulation components within the main rainbelt and along the monsoon margins show that changes to the mass convergence are related to the magnitude of precipitation that falls in the region, while the advection of dry air is associated with the maximum latitudinal extent of precipitation. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54125
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Environmental Sciences, Columbia University, 61 Route 9W, 143 Monell, Palisades, NY, United States; Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, 104B Oceanography, Palisades, NY, United States; International Research Institute for Climate and Society, 61 Route 9W, 109 Monell, Palisades, NY, United States
Recommended Citation:
Pomposi C.,Kushnir Y.,Giannini A.. Moisture budget analysis of SST-driven decadal Sahel precipitation variability in the twentieth century[J]. Climate Dynamics,2015-01-01,44(2017-11-12)