近50年来ENSO与祁连山区气温降水和出山径流的对应关系

Relationship between ENSO circle and air temperature, precipitation and runoff in the Qilian mountain region in the past 50 years

根据有关水文气象台、站的观测资料 ,分析了恩索 (ENSO)与祁连山区气温、降水的对应关系 ,研究了祁连山区出山径流对厄尔尼诺 (ElNino)现象响应。结果表明 :ElNino现象对祁连山区的气温、降水和径流的影响随着发生时间和地段的不同而不同。ElNino现象发生之年 ,整个祁连山区均出现气温偏高、降水减少及径流偏枯的现象 ,尤以东段和中段最为明显。ElNino现象次年 ,祁连山区东段和中段气温偏高、降水减少及径流偏估的程度不如ElNino现象当年那样显著 ,而西段的气温。

Based on the date from some weather and hydrometric stations, the corresponding relationship between El Nino, the air temperature, the precipitation and the runoff in the Qilian mountain is analyzed.The result shows that the effects of El Nino are different in the different time and zones.That is, when El Nino occurs, the air temperature rises, but the precipitation and the runoff decrease in the whole mountain area, especially in the east and middle parts.In the next year when El Nino occurs, however, though the air temperature rises, the precipitation and the runoff in the east and middle part of the Qilian mountain region don′t decrease as much as in the year when El Nino occurs, and there is no obvious correlativity between El Nino, the temperature, the precipitation and the runoff in the west part of Qilian mountain region.