ASIAN-PACIFIC OSCILLATION IN AUTUMN AND ITS RELATIONSHIPS WITH THE SUBTROPICAL MONSOON IN EAST ASIA  

作　　者：邹燕 赵平 林秋 

机构地区：[1]Fujian Climate Centre [2]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences [3]Fujian Meteorological Bureau

出　　处：《Journal of Tropical Meteorology》2015年第2期143-152,共10页热带气象学报（英文版）

基　　金：National Natural Science Foundation of China(91215302,51278308);Open Project for State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics(LAPC);Natural Science Foundation of Fujian Province(2014J01146)

摘　　要：Based on the 1961-2010 NCEP/NCAR reanalysis, this work uses empirical orthogonal function(EOF) and composite analysis to study the distributions of zonal land-sea thermal contrast between Asia and the Pacific during transitions from the summer monsoon to the winter monsoon in East Asian subtropics, and investigates the interannual variations of the thermal contrast and their relationships with circulation systems over the East Asian subtropics. The findings are as follows. 1) In autumn, the interannual variations of the temperature deviation in the middle and upper troposphere show significant east-west out-of-phase teleconnection over Asia and the central and eastern Pacific, i.e. the Asian-Pacific Oscillation, or APO. 2) While not as significant as in summer with regard to coverage and intensity, the APO shows interannual variations in autumn that well depicts the change in the intensity of the subtropical monsoon. In the high(low) APO year, the current subtropical summer monsoon is strong(weak) and the winter monsoon is weak(strong) in East Asia as derived from the general circulation and wind field of the East Asian-Pacific region.Based on the 1961-2010 NCEP/NCAR reanalysis, this work uses empirical orthogonal function（EOF） and composite analysis to study the distributions of zonal land-sea thermal contrast between Asia and the Pacific during transitions from the summer monsoon to the winter monsoon in East Asian subtropics, and investigates the interannual variations of the thermal contrast and their relationships with circulation systems over the East Asian subtropics. The findings are as follows. 1） In autumn, the interannual variations of the temperature deviation in the middle and upper troposphere show significant east-west out-of-phase teleconnection over Asia and the central and eastern Pacific, i.e. the Asian-Pacific Oscillation, or APO. 2） While not as significant as in summer with regard to coverage and intensity, the APO shows interannual variations in autumn that well depicts the change in the intensity of the subtropical monsoon. In the high（low） APO year, the current subtropical summer monsoon is strong（weak） and the winter monsoon is weak（strong） in East Asia as derived from the general circulation and wind field of the East Asian-Pacific region.

关 键 词：Asian-Pacific Oscillation AUTUMN East Asia Monsoon 

分 类 号：P461.2[天文地球—大气科学及气象学]