【摘要】 通过对2004年9月至2005年11月宁夏全区24个站连续15个月气温和降水资料进行分析,对干旱事件的气候特征、干旱环流特征以及造成干旱的成因进行初步诊断,其结果表明:宁夏2004—2005年特大干旱事件是在全球气候变暖的条件下发生的,贝加尔湖阻高以及500 hPa正高度距平持续维持是造成宁夏特大干旱事件发生的根本原因;同时,西太平洋副高与常年相比较弱也是其重要原因之一。更多还原

【Abstract】 We have analyzed the climate characters,atmospheric circulation characters and the causes of drought events in Ningxia based on the temperature and precipitation data of 24 observation stations in continuously 15 months from September 2004 to November 2005.The results showed that the extremely drought events in Ningxia during 2004-2005 occurred under the background of global warming,and the Baikal Blocking High and the persistence of 500 hPa Positive Height Anomaly were the main causes.Meanwhile,the feeble Pacific Subtropical High compared with the normal was also an important cause of drought event.更多还原