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2009年冬季新疆北部持续性暴雪的环流特征及其成因分析
引用本文: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.
作者姓名:张书萍  祝从文
作者单位:中国气象科学研究院,北京, 100081
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
摘    要:利用台站观测和NCEP/NCAR大气再分析等资料,通过与历史同期降水事件比较,分析了 2009年冬季发生在我国新疆阿勒泰地区持续的水汽和环流异常特征以及北极涛动(Arctic Oscillation,AO)和ENSO现象对该地区持续性暴雪的影响.结果发现,位于贝加尔湖以西的对流层持续性异常冷性低槽活动是影响2009年冬...

关 键 词:2009年冬季  新疆暴雪  环流异常  成因分析

Possible Causes of Circulation Anomalies Associated with Subsequent Snowstorms over the North of Xinjiang during Winter 2009
Zhang Shuping and Zhu Congwen.Possible Causes of Circulation Anomalies Associated with Subsequent Snowstorms over the North of Xinjiang during Winter 2009[J].Chinese Journal of Atmospheric Sciences,2011,35(5):833-846.
Authors:Zhang Shuping and Zhu Congwen
Institution:Chinese Academy of Meteorological Science, Beijing, 100081
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 is closely related to the weakened AO 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 Niño 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 Niño event possibly has little benefit to the successive snowstorms in this area.
Keywords:winter 2009  snowstorms in Xinjiang  circulation anomalies  causes analysis
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