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  Revised:August 15, 2019
KeyWords:Huaxi region’s Autumn Precipitation  Indian Ocean Dipole  Multiple-Taper Method-Singular Value Decomposition  phase  water vapor flux transported
Author NameAffiliationE-mail
LIU Jia 1. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu/610072, China. 2. Climate Center of Sichuan Province, Chengdu/610072, China. 3.Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, College of Atmospheric Science, Chengdu University of Information Technology, Chengdu/610225, China. 4.Institute of Tropical and Marine Meteorology, CMA, Guangzhou 510080, China  
ZHAO Peng-guo   
MA Zhen-feng  mzf616@aliyun.com 
GE Fei   
XIAO Hui   
WANG Chun-xue   
XU Yuan-xin   
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      The moving-window correlation analysis was applied to investigate the relationship between autumn Indian Ocean Dipole (IOD) events and the synchronous autumn precipitation in Huaxi region, based on the daily precipitation, sea surface temperature (SST) and atmospheric circulation data from 1960 to 2012. The correlation curves of IOD and the early modulation of Huaxi region’s autumn precipitation indicated a mutational site appeared in the 1970s. During 1960 to 1979, when the IOD was in positive phase in autumn, the circulations changed from a “W” shape to an ”M” shape at 500 hPa in Asia middle-high latitude region. Cold flux got into the Sichuan province with Northwest flow, the positive anomaly of the water vapor flux transported from Western Pacific to Huaxi region strengthened, caused precipitation increase in east Huaxi region. During 1980 to 1999, when the IOD in autumn was positive phase, the atmospheric circulation presented a “W” shape at 500 hPa, the positive anomaly of the water vapor flux transported from Bay of Bengal to Huaxi region strengthened, caused precipitation ascend in west Huaxi region. In summary, the Indian Ocean changed from cold phase to warm phase since the 1970s, caused the instability of the inter-annual relationship between the IOD and the autumn rainfall in Huaxi region.
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