冬季西太平洋暖池区Hadley环流年际变化特征及其与热带海温的关系

暖池尤其是西太平洋暖池是全球对流活动最频繁的地区,是驱动Hadley环流和Walker环流的主要热源以及引发ENSO等一系列海气相互作用的关键因素,近年来关于暖池的研究成为一个热点。应用NCEP/NCAR再分析资料中的速度势月平均资料和英国哈德莱中心海温资料,采用质量流函数法并结合经验正交函数分解、合成分析、相关分析、谐波分析等方法,分析研究了1952—2009年西太平洋暖池区域东经120°¹60°Hadley环流的年际变化特征及其与海温的关系。结果表明:西太平洋暖池区冬季气候态Hadley环流偏南,北支占主导地位,冬季西太平洋暖池区Hadley环流具有明显的年际变化特征,年代际特征不明显;冬季西太平洋暖池区Hadley环流的年际变化与太平洋、印度洋的海温异常有关,但其主要受ENSO信号的影响。

Interannual Variations of Boreal Winter Hadley Circulation in West-Pacific Warm Pool Region(WPWP)and Its Relationship with Equatorial SST

Warm pool , especially West-Pacific Warm Pool region is the most active region in the world , it's the main heat producer of Hadley Circulation and Walker Circulation and key factor of air -sea interactions like ENSO.Recently , it has been a hotspot.Monthly velocity potential reanalysis data of NCEP/NCAR from 1952 to 2009 and SST data from Hadley Circulation of 120°～160°E were used to discuss interannual variations of Hadley Circulation in West-Pacific Warm Pool region and its relationship with equatorial SST.MSF ( mass stream function ) combined with EOF ( empirical orthogonal function ), composite analysis , correlation analysis and harmonic analysis were used in this paper.Main results are as follows : Hadley Circulation is southwardly in boreal winter and it's northern branch is more intensive ; it has obvious interannual variations of boreal winter Hadley Circulation , however , it's interdecadal variations are not obvious ; interannual variations of Hadley Circulation of WPWP region in winter are associated with the Pacific and Indian Ocean SST anomaly , but it is mainly affected by ENSO.