2008/2009年秋冬季我国东部严重干旱分析  

The Severe Drought in East China During November,December and January 2008-2009

作　　者：陶诗言[1] 卫捷[1] 孙建华[1] 赵思雄[1] 

机构地区：[1]中国科学院大气物理研究所,北京100029

出　　处：《气象》2009年第4期3-10,共8页Meteorological Monthly

基　　金：国家科技支撑计划课题(课题编号2007BAC29B);公益性行业科研专项经费项目

摘　　要：2008/2009年秋冬季我国12省区出现30～50年一遇的罕见干旱,这次我国大范围严重干旱是较长时期降水稀少所造成的。欧亚中高纬度存在稳定的准静止环流系统是造成这次干旱灾害的主要成因。东亚大槽维持在日本东北部,高原上空为稳定的高压脊,中国大陆长时期处于东亚大槽槽后西北气流控制下;从亚洲西部过来的扰动系统不易东移到东亚上空;此外,北非、印度次大陆、中南半岛和中国大部冬季风异常盛行,来自海洋上的水汽不易到达这些地区。欧亚大陆稳定长达3个月的异常环流的形成机制,有待深入研究。In the fall and winter of 2008 to 2009, a rare severe drought struck twelve provinces in East China. This severe drought is due to the lack of rainfall for a sustained period. There was a quasi-stationary circulation system in the middle latitude over the Eurasia. There was a deep trough sustained over the northeast of Japan. In the Tibetan Plateau there was a stationary ridge. There was emulous cold air outbreak over the East China. Due to the persistence of the ridge over the plateau, the perturbations from West Asia could hardly reach East Asia. At the same time, the abnormal winter monsoon prevented the water vapor from the ocean reaching the land. The formation mechanism of such anomalous atmospheric circulation which lasted three months stably over Eurasia Continent is yet to be further studied.

关 键 词：中国东部 干旱 大气环流异常 

分 类 号：P426.616[天文地球—大气科学及气象学] P732.6