DOI: 10.1007/s00382-013-1827-4
Scopus记录号: 2-s2.0-84879551171
论文题名: A common mode of variability of African and Indian monsoon rainfall at decadal timescale
作者: Feudale L. ; Kucharski F.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2 起始页码: 243
结束页码: 254
语种: 英语
英文关键词: Drought
; Monsoon
; SST forcing
; Teleconnection
; Tropical Easterly Jet
英文摘要: There are many factors and mechanisms capable of influencing and perturbing rainfall in both African and Indian monsoon regions. Using observed data and ensembles of Atmospheric General Circulation Model simulations, evidence is presented that an association between the two systems exists on decadal timescales and the mechanism responsible for this common mode is suggested. Decadal variability of rainfall in the two monsoon systems results from a large scale forcing induced by an interplay of different ocean basins. The emerging pattern is characterized by warmer (cooler) equatorial and cooler (warmer) extratropical regions, more visible in the northern hemisphere. This large scale forcing pattern leads to an upper-level pressure gradient between the equator and the monsoon regions which modifies also the Tropical Easterly Jet, thus providing a potential link between the African and Indian monsoon. The response is baroclinic, therefore at low levels, the pressure gradient reverses and leads to increased (reduced) pressure over the Saharan and Indian region, both being favourable for a weakening (strengthening) of the respective monsoons. Therefore, the predictability of the monsoon trends depends mainly on how well the sea surface temperature modes, which modulate the monsoons variability, can be predicted. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54865
Appears in Collections: 过去全球变化的重建
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作者单位: The Abdus Salam International Centre for Theoretical Physics, Earth System Physics Section, Strada Costiera 11, 34151 Trieste, Italy; OSMER-Osservatorio Meteorologico Regionale dell'ARPA Friuli Venezia Giulia, 33040 Visco, UD, Italy
Recommended Citation:
Feudale L.,Kucharski F.. A common mode of variability of African and Indian monsoon rainfall at decadal timescale[J]. Climate Dynamics,2013-01-01,41(2)