1951—2010年西太平洋副热带高压脊线季节性变化特征分析  

Analysis on the Seasonal variation characteristic of the Western Pacific Subtropical High Ridge

作　　者：冯琬 徐婷[1] Feng Wan Xu Ting(Civil Aviation Flight University of China, Sichuan Guanghan 618307)

机构地区：[1]中国民航飞行学院,四川广汉618307

出　　处：《内蒙古气象》2016年第4期9-12,共4页Meteorology Journal of Inner Mongolia

基　　金：中国民航飞行学院青年基金项目(Q2014-067);中国民航飞行学院科研基金重点基金项目(ZJ2014-02)共同资助

摘　　要：文章通过对1951—2010年NECP/NCAR再分析逐日资料的分析,发现西太平洋副热带高压存在明显的季节性变化。夏季,副热带高压(以下简称副高)脊线出现两次显著的北跳,而且均伴随着副高强度指数的降低和西伸脊点的东退。脊线北跳过程也影响着东亚大气环流系统,南亚高压与西风急流在副高北跳后均同时减弱。但两次北跳过程仍然存在各自的特点:第一次副高脊线北跳时受到高纬地区纬向型环流调整与中低纬环流变化的共同影响,而第二次副高脊线北跳则主要受中低纬环流调整(太平洋负EAP事件)的影响。By a NECP / NCAR reanalysis daily data research, WPSH significant seasonal variation is showed foma 1961 to 2010. In summerthe ridge appeared two significant northward jumping, accompanied by reducing a index of intensity and restricting a west ridge point. The ridge jump also affected the East Asian atmospheric circulation systems, and South Asia high and the westerly jet were weakened after the jump. But two northward jumps still have their own characteristics： the first one was affected by a combined change between the high 1 and lower attitude circulation, and the second one is mainly affected by the hnpact of lower latitude circulation＇s adjustment （the positive EAP in Pacific）.

关 键 词：副高脊线 北跳 大气环流 

分 类 号：P434[天文地球—大气科学及气象学]