500mb形势数值预告的一种方案
A SCHEME OF NUMERICAL FORECASTING OF 500mb FIELD
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摘要: 在本文中,作者为了避免500mb位面是无辐散的假定,引用了在大气顶P=0处高度H随时间变化很小,而且此位面几近于一个平面的假设,经过一些变化后,便得出了500mb形势预告的方程,这个方程与正压涡度方程很相似,尤其当柵格取得小些时(例如600km),这个方程便较接近于正压预告方程,但二者是有本质上的区別的.于此文中,作者并指出在正压模式中,柵格取得小些时,可以得到较好的结果.从实例来看,这个方法是有些成功的.Abstract: A basic eguation for predicting 1100 mb topography is obtained on the following two assumptions: (1)the level of P=0 is a horizontal plane,(2)its height H does not change with timo. This equation is very similar to that for barotropic case, but with certain essential differences. In this article, author also points out that in the barotropic case, taking a smaller grid we will get a better rosult than that of alarge grid. The oxamples of Forecasting shove that this method is rather successful.
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