NDLI: A common mode of variability of African and Indian monsoon rainfall at decadal timescale

Content Provider	Springer Nature Link
Author	Feudale, Laura Kucharski, Fred
Copyright Year	2013
Abstract	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.
Starting Page	243
Ending Page	254
Page Count	12
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	41
Issue Number	2
e-ISSN	14320894
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-06-19
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drought Monsoon Teleconnection SST forcing Tropical Easterly Jet Geophysics/Geodesy Climatology Oceanography
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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