Topographical Effects on the Numerical Weather Prediction in the Lower Atnaosphere

[摘要] It is the purpose of this paper to make clear the height change of constant pressure with respect to time in the lower atmosphere. The vorticity change with time comes from the contribution of two factors; the one is the horizontal advection of absolute vorticity and another is the divergence or convergence of the horizontal velocity. The former problem is obtained from the calculation of the so-called Jacobian. However, there are many ways to estimate the latter one. In this paper, authors propose a method to calculate the divergence or convergence of horizontal velocity exactly. In this method we are able to take into account the effect of topography without any difficulty. The vertical p-velocity thus obtained is in good agreement with the observed one which is checked from the amount of precipitation due to dynamical and topographical effects.

[学科分类] 大气科学