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-...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.展开更多
基金Supported by the National Natural Science Foundation of China (Grant Nos. 40631005 and 40620130113)CAS International Partnership Project
文摘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.
基金国家自然科学基金(批准号:40830957,41075009)甘肃省自然科学基金(批准号:0803RJZA091)+4 种基金半干旱气候变化教育部重点实验室开放基金(批准号:223-860011)干旱基金项目(批准号:IAM200818-01)资助的课题.~~Project supported by the National Natural Sciene Foundation of China ( Grant Nos. 40830957,41075009)the Gansu Province Natural Science Foundation of China (Grant No. 0803RJZA091)the Open Fund in Key Laboratory for Semi-Arid Climate Change of the Ministry of Education (Grant No. 223-860011)the Arid Meteorology Science Foundation(Grant No. IAM200818-01).
