VARIABILITY OF THE INTER-ANNUAL RELATIONSHIP BETWEEN THE INDIAN OCEAN DIPOLE AND THE HUAXI REGION’S AUTUMN PRECIPITATION  

作　　者：LIU Jia ZHAO Pcng-guo MA Zhen-feng GE Fei XIAO Hui WANG Chun-xue XU Yuan-xin 刘佳;赵鹏国;马振峰;葛菲;肖辉;王春学;徐沅鑫(Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province,Chengdu 610072 China;Climate Center of Sichuan Province,Chengdu 610072 China;Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,College of Atmospheric Science,Chengdu University of Information Technology,Chengdu 610225 China;Guangzhou Institute of Tropical and Marine Meteorology,CMA,Guangzhou 510641 China)

机构地区：[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]Guangzhou Institute of Tropical and Marine Meteorology,CMA,Guangzhou 510641 China

出　　处：《Journal of Tropical Meteorology》2019年第4期498-518,共21页热带气象学报（英文版）

基　　金：National Natural Science Foundation of China(41275097);Special Foundation for Scientific Research in Public Welfare Industries of Ministry of Science and Technology(GYHY201306022);Climate Change Special Foundation of China Meteorological Administration(CCSF201915)

摘　　要：The moving-window correlation analysis was applied to investigate the relationship between autumn Indian Ocean Dipole(IOD) events and the synchronous autumn precipitation in the Huaxi region(western China), China,based on daily precipitation, sea surface temperature(SST), and atmospheric circulation data from 1960 to 2012. The correlation curves of IOD and the early modulation of the Huaxi region's autumn precipitation indicated a behavioral change in the 1970 s. Between 1960 and 1979, when the IOD was in a positive phase during autumn, circulations changed from a "W"shape to an "M"shape at 500 hPa in the middle-high latitude region in Asia. A northwest flow allowed a cold flux to reach Sichuan province. The positive anomaly of water vapor flux transported from the western Pacific to Huaxi region strengthened, causing a precipitation increase in the east Huaxi region. Between 1980 and 1999,when the IOD in autumn was also in the positive phase, the atmospheric circulation was a "W"shape at 500 hPa. In this scenario, the positive anomaly of the water vapor flux transported from the Bay of Bengal to Huaxi region strengthened, causing a precipitation increase in the west Huaxi region. In summary, the Indian Ocean switched from a cold phase to a warm phase during the 1970 s, causing the instability of the inter-annual relationship between IOD and the autumn rainfall in Huaxi region.The moving-window correlation analysis was applied to investigate the relationship between autumn Indian Ocean Dipole(IOD) events and the synchronous autumn precipitation in the Huaxi region(western China), China,based on daily precipitation, sea surface temperature(SST), and atmospheric circulation data from 1960 to 2012. The correlation curves of IOD and the early modulation of the Huaxi region’s autumn precipitation indicated a behavioral change in the 1970 s. Between 1960 and 1979, when the IOD was in a positive phase during autumn, circulations changed from a "W"shape to an "M"shape at 500 hPa in the middle-high latitude region in Asia. A northwest flow allowed a cold flux to reach Sichuan province. The positive anomaly of water vapor flux transported from the western Pacific to Huaxi region strengthened, causing a precipitation increase in the east Huaxi region. Between 1980 and 1999,when the IOD in autumn was also in the positive phase, the atmospheric circulation was a "W"shape at 500 hPa. In this scenario, the positive anomaly of the water vapor flux transported from the Bay of Bengal to Huaxi region strengthened, causing a precipitation increase in the west Huaxi region. In summary, the Indian Ocean switched from a cold phase to a warm phase during the 1970 s, causing the instability of the inter-annual relationship between IOD and the autumn rainfall in Huaxi region.

关 键 词：Huaxi region's autumn precipitation Indian Ocean Dipole Multiple-Taper Method-Singular Value Decomposition phase water vapor flux transported 

分 类 号：P467[天文地球—大气科学及气象学]