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| Titel |
Contribution of the east-west thermal heating contrast to the South Asian Monsoon and consequences for its variability |
| VerfasserIn |
Fred Kucharski, Annalisa Bracco, Rondrotiana Barimalala, Jin Ho Yoo |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034968
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| Zusammenfassung |
| This paper investigates the relative role of the north-south and
east-west contrast in atmospheric heating for the maintenance of
the South Asian summer monsoon climatology. The north-south contrast
results from the juxtaposition of the Eurasian land mass and the
Indian Ocean, while the east-west one is induced by the warmer
western Pacific warm pool on one side and by the African continent
and the cooler tropical South Atlantic Ocean on the other. For this
purpose a series of idealized Atmospheric General Circulation Model
(AGCM) experiments are performed. In the climatology, both contrasts
contribute to the mean South Asian monsoon circulation. The precipitation
and surface cyclone in the Bay of Bengal and over southern India are
affected mainly by the east-west heating contrast, given that the Indian
Ocean sea surface temperatures (SSTs) are close to their climatological
mean values. The precipitation and surface cyclone further inland over
northern India are mainly due to the north-south heating contrast.
The east-west heating contrast controls also the strength of the
Tropical Easterly Jet. Finally, the contribution of the El Nino
Southern Oscillation on the interannual Indian monsoon variability
is interpreted as resulting from changes in the east-west heating
contrast. |
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