大气科学2013，Vol.37Issue(4)：863-872,10.DOI:10.3878/j.issn.1006-9895.2012.12061
2011～2012年冬季欧亚大陆低温严寒事件与平流层北极涛动异常下传的影响
Strong Cold Weather Event over Eurasia during the Winter of 2011/2012 and a Downward Arctic Oscillation Signal from the Stratosphere
摘要
Abstract
The circulation evolution and possible causes of a severe cold event over the Eurasian continent during the winter of 2011/2012 were investigated with the NCEP-NCAR reanalysis data.Strong cold anomalies covering most of Europe,Mongolia,and northeastern China began in late January 2012 and lasted for about 3 weeks.Analysis results indicate that this cold event coincided with the phase of the Arctic Oscillation (AO) changing from positive to negative,which implied a possible impact of the AO.Before this AO phase change,a minor warming occurred in the stratosphere caused by an anomalous upward propagation of planetary waves.The polar night jet then decelerated and the AO changed its sign in the stratosphere.Within 2-3 weeks,the stratospheric AO signal gradually propagated downward and accordingly the tropospheric AO evolved into the negative phase.Thus,a strong Ural blocking high developed,and cold air invaded Europe and East Asia from the polar region,which induced the decreasing temperature there.Our results suggest that improvements can be made in predicting severe winter cold events over Eurasia by taking into account the stratospheric circulation anomaly.关键词
冬季低温严寒事件/北极涛动/平流层环流/行星波Key words
Severe cold event during winter/ Arctic Oscillation/ Stratospheric circulation/ Planetary wave分类
天文与地球科学引用本文复制引用
兰晓青,陈文..2011～2012年冬季欧亚大陆低温严寒事件与平流层北极涛动异常下传的影响[J].大气科学,2013,37(4):863-872,10.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 （）
