大气科学2012，Vol.36Issue(3)：523-538,16.DOI:10.3878/j.issn.1006-9895.2011.11083
东亚冬季风综合指数及其表达的东亚冬季风年际变化特征
An Integrated East Asian Winter Monsoon Index and Its Interannual Variability
摘要
Abstract
The collaborative relationship among members of the East Asian winter monsoon (EAWM) system is first examined through the multivariate EOF (MV-EOF). Univariate EOF is then used to define the intensity index of each single system. Based on the above analyses, an integrated index of the East Asian winter monsoon (EAWMII) is defined. The new index exhibits distinct interannual variability and takes into account variations of Siberian high, East Asian trough, and meridional shear of upper-tropospheric zonal wind. Results show that the EAWMII can capture well the continuous weakening of the EAWM since the mid-1980s. It is also statistically significantly correlated with variations of both atmospheric circulation fields and surface temperature during winter. In addition, the EAWMII is closely related to the Arctic Oscillation (AO) index, the Nino3.4 sea surface temperature index, and the North Pacific Oscillation (NPO) index. The impact of AO on the East Asian surface temperature primarily occurs in the middle and high latitudes of Eurasia, Northeast China, and North Japan, etc. The influence of NPO is mainly registered in South China, East China, North Korea, South Korea, and South Japan. It is very likely that the AO affects the EAWM via the NPO.关键词
东亚冬季风/大气环流/北太平洋涛动/北极涛动Key words
East Asian winter monsoon/atmospheric circulation/North Pacific Oscillation/Arctic Oscillation分类
天文与地球科学引用本文复制引用
贺圣平,王会军..东亚冬季风综合指数及其表达的东亚冬季风年际变化特征[J].大气科学,2012,36(3):523-538,16.基金项目
国家重点基础研究发展计划项目2009CB421406,国家自然科学基金资助项目40905041,中国科学院知识创新工程重要方向项目青年人才类KZCX2-YW-QN202,全球变化研究国家重大科学研究计划2010CB950304 （）
