过山气流与大兴安岭焚风  

AIRFLOW OVER MOUNTAIN AND DAXINGANLING FOEHN

作　　者：齐瑛[1] 傅抱璞[2] 

机构地区：[1]中国科学院力学研究所,北京100080 [2]南京大学大气科学系,南京210008

出　　处：《地理学报》1993年第5期403-411,共9页Acta Geographica Sinica

基　　金：国家教委高校博士点专项基金资助课题。

摘　　要：本文利用二维大气中尺度数值模式,模拟了冬季1月份大兴安岭东坡的焚风现象,并讨论了该焚风的成因。In China, Daxinganling foehn results in a long'warm ridge' ,which stretches from 40°N to 52°N in the Northeast region,in the distribution of sea-level average air temperatures in winter. Therefore, Daxinganling foehn seriously influences the climate of China. In this paper, a mesoscale numerical model, which has the ability to simulate the mesoscale mountain climates such as Boulder downslope windstorm in Americans used. By using this model, the foehn on the eastern slope of Daxinganling Mountains in the Northeast China in the winter is successfully simulated. The cause of formation for this foehn is discussed,and the following conclusions are obtained. (1)The Daxinganling foehn' warm ridge' at the east slope is due to the intense adiabatic subsidence of the strong downslope wind at the eastern steep slope. (2)The wave-breaking region over the Daxinganling eastern steep slope results in the strong downslope wind of the foehn. (3)The static hydraulic jump at the foot of the Daxinganling eastern steep slope makes the foehn occur only at the steep slope.

关 键 词：过山气流 大兴安岭 焚风 大气 

分 类 号：P425.52[天文地球—大气科学及气象学]