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| Titel |
Association of the East Asian subtropical westerly jet with the Southwest Asian summer monsoon: A diagnostic analysis on heavy rain events in Yunnan province, China |
| VerfasserIn |
Jie Chen |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124376
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| Publikation (Nr.) |
 EGU/EGU2016-3799.pdf |
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| Zusammenfassung |
| Yunnan province, China is a typical area that is influenced by Southwest Asian summer
monsoon (SASM) during boreal summer. Although the interannual variation of summer
precipitation in Yunnan Province is closely related to that of the SASM, the East Asian
subtropical westerly jet (EASWJ) may have an important role in heavy rainfall events in
Yunnan Province during boreal summer. By using daily observations and the NACAR/NCEP
data during 1960-2011, a diagnostic analysis is performed to investigate the association of the
EASWJ with the SASM on heavy rain events in Yunnan Province during boreal
summer.
The analysis shows an anomalous divergence circulation pattern at upper level (200 hPa)
over Eurasian continent that corresponds well to the negative anomaly of EASWJ during
heavy rain events in boreal summer in Yunnan Province. At the same time, a low-level jet
stream with abundant water vapor originated from the Arabian Sea and Bengal gulf provides
necessarily dynamic and water conditions for heavy rain mechanism. The study further shows
that the weakening of the EASWJ during heavy rain events in Yunnan Province is associated
with the decrease in the meridional temperature gradient in northern mid-latitude (30o-40o
N). |
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