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| Titel |
A Gill-Matsuno-type mechanism explains the Tropical Atlantic influence on African and Indian Monsoon Rainfall |
| VerfasserIn |
A. Bracco, F. Kucharski, J. H. Yoo, A. M. Tompkins, L. Feudale, P. Ruti, A. Dell'Aquila |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250025316
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| Zusammenfassung |
| Recent studies using coupled atmosphere-ocean models have shown that the tropical
Atlantic has a significant impact on the Indian monsoon. In this paper, the
observational basis for this teleconnection is examined and the physical mechanism
responsible for bridging sea surface temperatures (SSTs) in the Atlantic and
precipitation over India is investigated with idealized atmospheric general
circulation model (AGCM) experiments in which constant SST anomalies are prescribed
and \'switched-on\' in the tropical Atlantic region. A simple Gill-Matsuno-type
quadrupole response is proposed to explain the teleconnection between the tropical
Atlantic and the Indian basin, with an enforcement of the eastward response likely
due to nonlinear interactions with the mean monsoon circulation. The simplicity of
this mechanism suggests reproducibility of this result with a broad range of AGCMs. |
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