地理学报 ›› 1993, Vol. 48 ›› Issue (5): 403-411.doi: 10.11821/xb199305003

• 论文 • 上一篇    下一篇

过山气流与大兴安岭焚风

齐瑛1, 傅抱璞 2   

  1. 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
  • 出版日期:1993-09-15 发布日期:1993-09-15
  • 基金资助:
    国家教委高校博士点专项基金资助课题

AIRFLOW OVER MOUNTAIN AND DAXINGANLING FOEHN

Qi Ying1, 2   

  1. 1. Institute of Mechanics CAS, Beijing 100080;
    2. Depart. of Atmospheric Sciences, Nanjing University 210008
  • Online:1993-09-15 Published:1993-09-15

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。

关键词: 过山气流, 大兴安岭焚风, 波破碎, 内部水跃

Abstract: 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 America ,is 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 con-elusions are obtained: (I)The Daxinganling foehn"warm ridge"at the east slope is due to the intense adiabatic sub-sidence 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 foelw occur only at the steep slope.

Key words: airflow over mountain, daxinganling foehn, wave breaking, Internal hy-draulic jump