Modelling the influence of North Atlantic multidecadal warmth on the Indian summer rainfall

Details Modelling the influence of North Atlantic multidecadal warmth on the Indian summer rainfall Modelling the influence of North Atlantic multidecadal warmth on the Indian summer rainfall

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3505804l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 5, CiteID L05804

Physics

13

Biogeosciences: Climate Dynamics (1620), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Atmospheric Processes: Precipitation (1854), Atmospheric Processes: Global Climate Models (1626, 4928)

Scientific paper

Ensemble experiments with an atmospheric general circulation model reveal that a positive (warm) ocean phase of the Atlantic Multidecadal Oscillation (AMO) increases Indian summer rainfall. The intensification is driven by extratropical North Atlantic warmth, with some cancellation associated with monsoon weakening in response to tropical North Atlantic warmth. Mechanistically, warm extratropical North Atlantic SSTs increase local rainfall, inducing an arching extratropical wavetrain response. The latter leads to intensified northern subsidence of monsoon mean meridional streamflow as well as widespread low surface pressure over North Africa, the Middle East and the western Indian Ocean contributing to a strengthened Indian monsoon trough and increased monsoon rainfall. Warm tropical North Atlantic SSTs primarily increase local tropical Atlantic rainfall that induces a tropically-confined response consisting of low level easterly wind anomalies over the Indian Ocean and dynamically induced subsident drying over India.

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