南海季风爆发早晚年大气环流的输送异常Ⅰ:动力输送异常  

Anomalies of the General Circulation Transport during Onset of South China Sea Summer Monsoon in the Early or Later YearsⅠ: Atmospheric Circulation Anomaly

作　　者：余莲[1] 封彩云[2,3] 

机构地区：[1]中国气象局成都高原气象研究所,成都610072 [2]成都信息工程学院,成都610042 [3]高原大气与环境四川省重点实验室,成都610042

出　　处：《高原山地气象研究》2014年第1期40-45,共6页Plateau and Mountain Meteorology Research

基　　金：国家重点基础研究发展计划项目(2012CB417202);成都高原气象研究所开放基金(BROP201332;BROP201326);四川省教育厅重点项目(11ZA267);高原大气与环境四川省重点实验室开放基金(PAEKL-2011-YZ);成都信息工程学院校引进人才项目(KYTZ201220)

摘　　要：利用NCEP逐日再分析资料,计算和分析了1949～ 2009年的南海季风爆发时间,并分析讨论了南海季风爆发偏早年和偏晚年大气环流的差异.结果表明：1）南海季风的爆发伴随着该地区降水的显著增加,且爆发时间在1958 ～1997年间呈偏早趋势.2）在南海季风爆发早年相对于晚年,中高层纬向风在青藏高原和西南太平洋西风异常偏强、孟加拉湾和南海有东风异常偏弱.3）在低层,孟加拉湾、南海和东海西风异常偏强、西南太平洋东风异常偏弱;而青藏高原北部塔里木盆地北风异常偏弱、中国中东部、南海和孟加拉湾南风异常偏弱、东海南风异常偏强.亚欧大陆、印度洋、南海和西南太平洋的大气环流异常与南海地区降水关系密切.The paper calculated and analyses the onset time of South China Sea Summer Monsoon during 1949 to 2009, and discussed anomalies of the General Circulation in the early and later years used the NCEP daily reanalysis data. The results showed ： 1 ） a sudden increase in precipitation in the South China Sea Summer Monsoon onset, and the onset time becomes earlier during 1949 to 2009. 2）For the anomalies of early years and late years, in 200 and 500hPa, the Tibetan Plateau and the Southwest Pacific has abnormal stronger westerly, Bay of Bengal and the South China Sea has abnormal weaker easterly. 3 ） For the anomalies of early years and late years, in 850hPa, the Bay of Bengal, the South China Sea and East China Sea has abnormal stronger westerly winds, Southwest Pacific has abnormal weaker easterly. And the northern Tibetan Plateau has abnormal weaker northerly wind, the east China, the South China Sea and the Bay of Bengal have abnormal weaker southerly, and Tokai has abnormal stronger southerly.

关 键 词：南海季风 大气环流 差异 

分 类 号：P434[天文地球—大气科学及气象学]