THE RELATIONSHIP BETWEEN EXTREME PRECIPITATION ANOMALY IN SOUTH OF CHINA AND ATMOSPHERIC CIRCULATION IN THE SOUTHERN HEMISPHERE  

作　　者：闵屾 钱永甫 

机构地区：[1]School of Atmospheric Sciences,Institute of Severe Weather and Climate,Nanjing University [2]State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences

出　　处：《Journal of Tropical Meteorology》2010年第1期35-41,共7页热带气象学报（英文版）

基　　金：National Basic Research Program of China (2004CB418300, 2010CB833406);National Natural Science Foundation of China (40675042, 40890054, 40871007)

摘　　要：Based on the daily rainfall datasets of 743 stations in China and the NCEP/NCAR monthly reanalysis data during the period of 1960-2003,the relationship between the anomalous extreme precipitation(EP) in the south of China and atmospheric circulation in the Southern Hemisphere is analyzed.The phenomenon of opposite changes in the sea level pressure and geopotential height anomalies over the Ross Sea and New Zealand is defined as RN,and the index which describes this phenomenon is expressed as RNI.The results show that the RN has barotropic structure and the RNI in May is closely related to the June EP amount in the south of China(SCEP) and the East Asian summer monsoon(EASM).The positive correlations between the May RNI at each level and the June SCEP are significant,and the related simultaneous correlations between the RNI and the June SCEP are also positive,suggesting that the potential impact of RN on the SCEP persists from May to June.Therefore,RN in May can be taken as one of the predictive factors for the June SCEP.Furthermore,one possible physical mechanism by which the RN affects the June SCEP is a barotropic meridional teleconnection emanating from the Southern Hemisphere to the western North Pacific.Based on the daily rainfall datasets of 743 stations in China and the NCEP/NCAR monthly reanalysis data during the period of 1960- 2003, the relationship between the anomalous extreme precipitation （EP） in the south of China and atmospheric circulation in the Southern Hemisphere is analyzed. The phenomenon of opposite changes in the sea level pressure and geopotential height anomalies over the Ross Sea and New Zealand is defined as RN, and the index which describes this phenomenon is expressed as RNI. The results show that the RN has barotropic structure and the RNI in May is closely related to the June EP amount in the south of China （SCEP） and the East Asian summer monsoon （EASM）. The positive correlations between the May RNI at each level and the June SCEP are significant, and the related simultaneous correlations between the RNI and the June SCEP are also positive, suggesting that the potential impact of RN on the SCEP persists from May to June. Therefore, RN in May can be taken as one of the predictive factors for the June SCEP. Furthermore, one possible physical mechanism by which the RN affects the June SCEP is a barotropic meridional teleconnection emanating from the Southern Hemisphere to the western North Pacific.

关 键 词：south of China extreme precipitation ANOMALY Ross Sea-New Zealand 

分 类 号：P461[天文地球—大气科学及气象学]