甘肃2002年伏秋连旱的气候异常及成因诊断  

The Dynamic Diagnose on the Abnormity and Cause of Summer and Autumn Continuous arid of 2002 in Gansu Province

作　　者：刘德祥[1] 董安祥[2] 瞿汶[1] 

机构地区：[1]兰州中心气象台,甘肃兰州730020 [2]中国气象局兰州干旱气象研究所,甘肃兰州730020

出　　处：《干旱气象》2003年第4期27-31,共5页Journal of Arid Meteorology

基　　金：甘肃省科技攻关项目(GS012-A45-118);西北干旱成因及应用研究资助

摘　　要：针对甘肃2002年伏秋连旱的持续时间、范围和强度进行了对比分析,干旱持续时间之长、范围之大为近50a所少见。伏秋连旱的成因主要是欧亚500hPa中高纬度西风环流比较强,贝加尔湖脊强,西北太平洋副热带高压强,印度半岛南支槽浅,亚洲大陆海平面气压场偏高,厄尔尼诺事件和海表温度异常共同作用所致。这些结果对防灾减灾措施的制定和作为短期气候预测的气候背景都有重要的参考意义。A study was carried out about the duration time, scope, and intension of the 2002 summer and autumn continuous drought in Gansu , which long duration time and heavy intension scarcely appeared in recent 50 years.The causes of continuous drought were mainly depended on that Westerly circumfluence, and the High ridge over Baikal and Northwestern Pacific very strong;the trough over Southern Indian Peninsula weak; the sea level pressure departure on the high side; sea surface temperature anomaly and El Nino occurring.All those above together forced into continuous drought in Gansu Province. These results were significantly to establish the preventing and reducing calamities rules and valuably to short-term climate forecast.

关 键 词：伏秋连旱 气候异常 环流 厄尔尼诺 海表温度异常 

分 类 号：P458.1[天文地球—大气科学及气象学] P426.616