正压模式中大地形作用下的低频波  

LOW-FREQUENCY WAVES FORCED BY LARGE-SCALE TOPOGRAPHY IN THE BAROTROPIC MODEL

作　　者：付遵涛[1,2] 刘式适[1,2] 王树涛 

机构地区：[1]北京大学地球物理系 [2]哈尔滨市渔业机械化施工公司

出　　处：《高原气象》1998年第3期223-230,共8页Plateau Meteorology

基　　金：国家攀登B项目;攀登项目

摘　　要：利用包含大地形和常数纬向基本气流的正压模式方程组，研究了大地形对低频波激发的作用，结果表明：起作用的地形因子主要是地形的最大高度和地形坡度。地形最大高度的作用主要是使Ｒｏｓｓｂｙ波趋向低频，而地形坡度的作用主要是对Ｒｏｓｂｙ波的稳定性起决定作用。同时，适当的地形坡度也可导致低频波的形成。A barotropic model, including large-scale topography and zonal mean flow, was established to discuss the effects of large-scale topography on the low-frenquency waves. The results show that two main factors which affects low-frequency waves is maximal height of topography and topographic slope. The former makes frequency of topographic Rossby waves decrease, the latter makes Rossby waves instable. Moreover, when topographic slope is optimum, it can also make Rossby waves turn into low-frequency waves.

关 键 词：大地形 低频波 地形坡度 正压模式 气压 气流 

分 类 号：P434[天文地球—大气科学及气象学]