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《大气科学进展(英文版)》 2009-04
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The Antarctic Oscillation-East Asian Summer Monsoon Connections in NCEP-1 and ERA-40

ZHU Yali1,2,3 1Nansen-Zhu International Research Center,Institute of Atmospheric Physics, Chinese Academy of Sciences,Beijing 100029 2Graduate University of Chinese Academy of Sciences,Beijing 100049 3Climate Change Research Center(CCRC),Chinese Academy of Sciences,Beijing 100029  
Connections between the spring Antarctic Oscillation(AAO)and the East Asian summer monsoon (EASM)in two reanalysis datasets—NCEP-1(NCEP/NCAR Reanalysis 1)and ERA-40(ECMWF 40- year Reanalysis)—are investigated in this study.Both show significant correlation between AAO and EASM rainfall over the Yangtze River valley,especially after about 1985.Though ERA-40 shows weaker anomalous signals connecting AAO and EASM over southern high latitudes than NCEP-1,both datasets reveal similar connecting patterns between them.A wave-train-like pattern appears in the upper levels,from southern high latitudes through east of Australia and from the Maritime Continent to East Asia.In positive AAO years, the cross equatorial southeasterly flow over the Maritime Continent in the lower levels is strengthened,the specific humidity of the whole atmosphere over East Asia increases,and convective activity is enhanced;thus the summer rainfall over East Asia increases.The spring AAO-EASM connection may be better represented in ERA-40.
【Fund】: supported by Na-tional Basic Research Program of China (973 Program)under Grant No 2009CB421406;; the Chinese Academy of Sciences under Grant KZCX2-YW-Q1-02;; the Na-tional Natural Science Foundation of China under Grants Nos 40875048 40620130113 and 40631005
【CateGory Index】: P425.42
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