青藏高原对莫东北侧初夏干旱天气影响的数值研究

A NUMERICAL STUDY TO EFFECTS OF QINGHAI-XIZANG PLATEAU ON THE DROUGHT-WEATHER IN ITS NORTHEASTERN SIDE

中文关键词:  青藏高原  干旱天气  数值研究

英文关键词:Qinghai-Xizang plateau  Drought weather  Numerical study

中文摘要:

      本文利用改进的T_42L9模式,以1979年6月14日12时的FGGE-Ⅲ_b资料为初始场,分别在有地形非绝热,有地形绝热以及无地形绝热情形下进行了五天数值预报试验,研究了青藏高原的热力和动力作用对高原东北侧干旱天气的影响,模拟结果指出,在初夏夏季风爆发期间,青藏高原有利于其东侧(包括甘肃南部和陕西南部一带)进入雨季,但也有利于其北侧的河西走廊地区维持干旱,高原的动力和热力作用对高原北侧的初夏干旱天气有着重要的影响。

英文摘要:

      Using the FGGE-IIIb data covering period from 14 June to 19 June 1979,the dynamic and thermodynamic influences of the Qinghai-Xizang Plateau on the drought weather in its northeastern side are physically investigated employing a general circulation model (T42L9) with a improved cloud-radiation scheme. By virtue of the five-day prediction experiments,with and without the inclusion of mountain and/or diabatic heating effects,it is found that the influences of Qinghai-Xizang Plateau are very significant for its northeastern drought-weather,and also for its eastern monsoon rainfall in the early Summer.