Relationship between the Antarctic oscillation in the western North Pacific typhoon frequency  

作　　者：WANG HuiJun FAN Ke 

机构地区：[1]Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China [2]Department of Atmospheric Science, Yunnan University, Kunming 650091, China

出　　处：《Chinese Science Bulletin》2007年第4期561-565,共5页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 40631005 and 40620130113);CAS International Partnership Project

摘　　要：Relationship between the Antarctic oscillation (AAO) and the western North Pacific typhoon number (WNPTN) in the interannual variability is examined in this research. The WNPTN is correlated with the AAO in June-July-August-September (JJAS) in 1949-1998 at -0.48 for the detrended time series, statistically significant at 99% level. The tropical atmospheric circulation as well as the sea surface temperature variability over the western Pacific associated with AAO has been analyzed. It follows that a positive phase of JJAS AAO corresponds to the larger magnitude of the vertical zonal wind shear, the anomalous low-lever anticyclonic circulation and anomalous high-level cyclonic circulation, and lower sea surface temperature in the major typhoon genesis region in the western North Pacific, thus providing unfavorable environment for the typhoon genesis, and vice versa.Relationship between the Antarctic oscillation （AAO） and the western North Pacific typhoon number （WNPTN） in the interennuel variability is examined in this research. The WNPTN is correlated with the AAO in June-July-August-September （JJAS） in 1949-1998 at -0.48 for the detrended time series, statistically significant at 99% level. The tropical atmospheric circulation as well as the see surface tamperature variability over the western Pacific associated with AAO has been analyzed. It follows that e positive phase of JJAS AAO corresponds to the larger magnitude of the vertical zonal wind shear, the anomalous low-lever anti-cyclonic circulation end anomalous high-level cyclonic circulation, end lower see surface temperature in the major typhoon genesis region in the western North Pacific, thus providing unfavorable environment for the typhoon genesis, end vice versa.

关 键 词：西北太平洋 台风 发生频率 南极涛动 大气环流 

分 类 号：P444[天文地球—大气科学及气象学]