DOI: 10.1007/s00382-012-1426-9
Scopus记录号: 2-s2.0-84869489286
论文题名: Interdecadal variation of the West African summer monsoon during 1979-2010 and associated variability
作者: Li H. ; Wang H. ; Yin Y.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 12 起始页码: 2883
结束页码: 2894
语种: 英语
英文关键词: Atmospheric background circulation
; Interdecadal variation
; Numerical simulation
; Physical mechanism
; West African summer monsoon
英文摘要: This paper addresses the interdecadal variation of the West African summer monsoon (WASM) along with its background of atmospheric circulation and possible physical mechanism over the past 32 years (1979-2010). It is indicated that the WASM starts to strengthen from 1998 as the rainfall begins to increase over western West Africa on the whole, which shows a new interdecadal variation. In this interdecadal variation, the strengthened ascending motion corresponding to enhanced divergence (convergence) movement on the upper (lower) troposphere is prone to develop the local circulation of the monsoon. Moreover, the strengthened southwestern (eastern) wind on the lower (upper) level leads to more moisture from the Atlantic and the Gulf of Guinea transported to the West African continent. In addition, the summer subtropical high over the north Atlantic and western West Africa is strong and northward, and the tropical east wind is also strong. Statistically, the weaker (stronger) the spring North Atlantic Oscillation (NAO) is, the stronger (weaker) the tropical easterly is, and then the WASM is also stronger. But the effect of the NAO on the decadal variation of the WASM is not so significant from the north Atlantic anomaly sensitivity simulation with a single model. This is also an indication that the relationship between the WASM and NAO is complicated in an interdecadal time scale and is needed further study. In terms of sea surface temperature (SST) variation, the tendency is toward warming in the subtropical north Pacific, the south Pacific and north Atlantic. Numerical simulation experiments and data analysis show that the SST variation in the north Pacific plays an important role in the latest interdecadal strengthening of the WASM during the past 32 years, while the influences of the south Pacific and the north Atlantic SST anomalies are not so significant to the associated atmospheric circulation changes. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55115
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Graduate University of Chinese Academy of Sciences, Beijing, 100049, China; Climate Change Research Center, Chinese Academy of Sciences, Beijing, 100029, China; Center for Earth System Science, Tsinghua University, Beijing, 100084, China
Recommended Citation:
Li H.,Wang H.,Yin Y.. Interdecadal variation of the West African summer monsoon during 1979-2010 and associated variability[J]. Climate Dynamics,2012-01-01,39(12)