气象2012，Vol.38Issue(11)：1399-1407,9.
2009／2010年西南地区秋冬春持续干旱的成因分析
Causative Analysis of Continuous Drought in Southwest China from Autumn 2009 to Spring 2010
摘要
Abstract
Based on the 1951-2010 daily Compound Index (CI) and atmospheric circulation monitoring in- dex provided by National Climate Center, the daily precipitation data of the 335 stations in the Southwest China, the daily NCEP/NCAR reanalysis data and the daily OLR data of NOAA, the distribution of the drought patterns in the Southwest China was analyzed by using the REOF method, and the characteristics of atmospheric circulation anomalies such as western Pacific subtropical high (WPSH), Indian-Burma trough, convection activities, water vapor transportation, and vertical motion of the continued drought from autumn 2009 to spring 2010 in the Southwest China were revealed according to the composite analysis and correlation analysis methods. It was found that the extreme drought occurred in the medium strength and central pattern E1 Nino background, instead of statistical typical La Nifia background. The results in- dicated that influenced by the central type E1 Nifio, the anti-Walker circulation caused the significantly ab- normal sinking movement around 120°E in the equator and a strong abnormal anti-cyclone in the South Chi- na Sea and the surrounding areas of Southeast Asia. At the same time, the Southwest China was affected by the abnormal northwest air stream. By both influences, an obvious airflow divergence area occurred in the lower troposphere and its persistence was the key cause for the extreme drought.关键词
西南地区/秋冬春/持续干旱/成因分析/大气环流异常Key words
Southwest China/autumn-winter-spring/continued drought/causative analysis/atmosphericcirculation anomalies分类
天文与地球科学引用本文复制引用
王晓敏,周顺武,周兵..2009／2010年西南地区秋冬春持续干旱的成因分析[J].气象,2012,38(11):1399-1407,9.基金项目
国家科技支撑计划项目（2009BAC51805）和公益行业（气象）科研专项（GYHY201006019,GYHY200806004）共同资助 （）
