大气科学2012，Vol.36Issue(2)：423-432,10.DOI:10.3878/j.issn.1006-9895.2011.11066
北半球冬季欧亚遥相关型的变化特征及其对我国气候的影响
Variability of the Eurasian Teleconnection Pattern in the Northern Hemisphere Winter and Its influences on the Climate in China
摘要
Abstract
Based on the monthly mean NCEP/NCAR reanalysis dataset and the surface air temperature and precipitation data from 160 China stations, the interannual variations of winter Eurasian teleconnection pattern (EU) and its possible influence on the climate in China are investigated. Wavelet analysis reveals that the significant periods of Eurasian teleconnection pattern index (EU index) are 2-4 years. The result suggests that the interannual variation of the EU is dominant, whereas the interdecadal component is weak. In a winter with positive EU phase, the East Asian westerly jet stream at 200 hPa tends to be enhanced and the East Asian trough at 500 hPa becomes stronger. In the meantime, there are the surface northerly anomalies in East Asia which lead to a cooling condition over there. The opposite situations tend to occur in a negative EU winter. Hence, during the boreal winter the cooling and less precipitation are likely to occur in most of eastern China associated with a positive phase of EU.关键词
欧亚遥相关型/气候异常/东亚冬季风Key words
Eurasian teleconnection (EU) / climate anomalies/ East Asian winter monsoon分类
天文与地球科学引用本文复制引用
刘毓赟,陈文..北半球冬季欧亚遥相关型的变化特征及其对我国气候的影响[J].大气科学,2012,36(2):423-432,10.基金项目
国家重点基础研究发展规划项目2010CB428603,国家自然科学基金资助项目41025017、40921160379 （）
