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

CHEN Jie; JIN Liya

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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

CHEN Jie 1 #,JIN Liya 2 *

1.College of Earth and Environmental Sciences, Lanzhou University, 730000

2.College of Earth and Environmental Sciences, Lanzhou University, 730000

*Correspondence author

#Submitted by

Subject:

Funding: the National Natural Science Foundation of China （No.No. 41275071 and No. 41505043）

Opened online: 2 March 2017

Accepted by: none

Citation: CHEN Jie,JIN Liya.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[OL]. [ 2 March 2017] http://en.paper.edu.cn/en_releasepaper/content/4719965

By using daily observations and the NCEP/NCAR reanalysis data during 1960-2011, a diagnostic analysis is performed to investigate the association of the East Asian subtropical westerly jet (EASWJ) with the Southwest Asian summer monsoon (SASM) on heavy rain events in Yunnan Province of southwest China during SASM prevailing season. The diagnostic analysis shows an anomalous divergence circulation pattern at upper level (200 hPa) over Eurasian continent that corresponds well to the negative anomaly of EASWJ intensity during the heavy rain events in boreal summer in Yunnan Province. Meanwhile, a low-level jet stream with abundant water vapor originated from the Arabian Sea and Bay of Bengal 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 air temperature gradient in northern mid-latitude (30o-45oN).

Keywords:atmospheric sciences; heavy rain events; East Asian subtropical westerly jet; low-level jet stream; meridional air temperature gradient

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