对“08．10—09．01”山西省异常干旱成因的探讨

Discussion of the Reason of Unusually Drought from Oct. 2008 to Jan. 2009 in Shanxi Province

本文利用NCEP再分析资料和山西省实测降水资料（1961年－2000年），定性、定量地分析东亚水汽分布、水汽输送与山西省2008年10月中旬至2009年1月底干旱的关系，得出山西省上空低层大气的含水量偏少是该时期干旱的一个重要因素。由于青藏高原大地形作用，孟加拉湾和南海的水汽北上受阻，不能到达山西省是形成山西省干旱的又一原因。受大气环流影响，山西省水汽辐合偏弱也是此次干旱的重要原因之一。

The relationship between the water distribution in East Asia and moisture transport and the drought in mid-October 2008 to the end of January 2009 in Shanxi province were qualitatively and quantitatively analyzed based on NCEP data and the observed precipitation data. It was an important factor that water content was less than normal in lower atmosphere. It was another reason that the water vapor from Bay of Bengal and South China Sea was blocked by the Qinghai-Tibet Plateau. It was one of important reason that moisture convergence was weaker in Shanxi province.