大气科学2011，Vol.35Issue(5)：833-846,14.
2009年冬季新疆北部持续性暴雪的环流特征及其成因分析
Possible Causes of Circulation Anomalies Associated with Subsequent Snowstorms over the North of Xinjiang during Winter 2009
摘要
Abstract
The anomalies of moisture flux and atmospheric circulations linked to the subsequent snowstorms occurring in Altay area of Xinjiang during winter 2009 are discussed on the basis of station-observed and NCAR/NCEP reanalyzed data sets, and the possible causes associated with ENSO and Arctic Oscillation (AO) are addressed in the framework of historical analog analysis. Results suggest the enhanced anomalous cold trough in the west of Lake Baikal is a critical circulation system, and its maintenance resulted in the west cold surge moving southward, meeting the southwest warm and wet air coming from the Caspian Sea in North Xinjiang, and caused the successive snowstorms. Correlation analysis suggests that the enhanced anomalous cold trough over the west of Lake Baikal isclosely related to the weakened A() index. In negative AO index phase, the 500-hPa geopotential height around Lake Baikal decreases, a meridional circulation anomalies pattern prevails in the Northern Hemisphere, which maintained the Ural blocking high and gave rise to the southward moving clod surge along the west of Lake Baikal, and results in the successive cold waves and snowstorms in the north of Xinjiang. Analysis suggests that during the El Nino year, the enhanced western North Pacific subtropical high results in the southeast moisture flux, but the northward component could not arrive in North Xinjiang, therefore the El Nino event possibly has little benefit to the successive snowstorms in this area.关键词
2009年冬季/新疆暴雪/环流异常/成因分析Key words
winter 2009, snowstorms in Xinjiang, circulation anomalies, causes analysis分类
天文与地球科学引用本文复制引用
张书萍,祝从文..2009年冬季新疆北部持续性暴雪的环流特征及其成因分析[J].大气科学,2011,35(5):833-846,14.基金项目
国家自然科学基金资助项目40921003,公益性行业(气象)科研专项GYHY200906017,中国气象科学研究院基本科研业务项目2010Z001、 2010Z003 （气象）
