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Titel |
Teleconnection between Australian winter temperature and Indian summer monsoon rainfall |
VerfasserIn |
S.-Y. Lee, T. Y. Koh |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1680-7316
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Digitales Dokument |
URL |
Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-16), S.669-681 |
Datensatznummer |
250010522
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Publikation (Nr.) |
copernicus.org/acp-12-669-2012.pdf |
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Zusammenfassung |
The pattern of evaporative sources and the direction of the large-scale
circulation over the Indian Ocean during the boreal summer raises the
question of whether atmospheric conditions in Australia could influence
conditions over the Indian subcontinent, despite the long passage of air
over the Indian Ocean. The authors propose that such an influence is sometimes
possible when there is unusually low temperature over inland Australia
during the austral winter, through the mechanism where such a temperature
extreme enhances evaporation rate over the eastern tropical Indian Ocean and
hence enhances rainfall over two regions in western India after 13–19
days. Results from trajectory calculations indicate that such an influence
is mechanistically feasible, with air of Australian origin contributing
0.5–1.5% of the climatological net precipitation for monsoon seasonal
rainfall over western India. Statistics performed on reanalysis, satellite
and in situ data are consistent with such a mechanism. Since extreme winter
temperature in Australia is often associated with cold-air outbreaks, the
described mechanism may be an example of how southern hemispheric
mid-latitude weather can influence northern hemispheric monsoon rainfall.
Further study is recommended through modelling and comparison with various
known causes of atmospheric variability to confirm the existence of such a
mechanism and determine the extent of its influence during specific low
temperature episodes. |
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