青藏高原大地形作用下的Rossby波

ROSSBY WAVE AFFECTED BY LARGE-SCALE TOPOGRAPHY OF QINGHAI XIZANG PLATEAU

在对青藏高原大地形的动力和热力作用作物理分析的基础上 ,着重分析了青藏高原地形坡度和非绝热加热对二维Rossby波的影响。研究指出 :高原地形坡度对Rossby波的作用与Rossby参数的作用相当 ,而且其相速度和群速度之间存在一个圆的关系 :(cgx-cx) 2 +c2 gy =R2 ;高原加热作用与水平辐合作用相当。地形坡度和非绝热加热都有使二维Rossby波向低频发展的趋向。

On the basis of analysis on dynamic and thermal effects of large scale topography of Qinghai Xizang Plateau we will focus to analyze the effect of slope and diabatic heating of Qinghai Xizang Plateau on the 2 D Rossby wave. It is shown that the effect of topography slope of Qinghai Xizang Plateau on Rossby wave is equivalent to the effect of Rossby parameter; it is a circle between phase velocity and group velocity (c gx -c x) 2+c 2 gy =R 2; and the heating effect is just equivalent to the effect of horizontal convergence. The slope and biabatic heating will make 2 D Rossby wave turning into low frequency wave.