大气模式垂直离散的比较研究

对温度有关量的垂直离散进行了讨论。分析指出：垂直离散量的计算应分别情况不同对待，温度垂直廓线较光滑的，可以直接用差分或Ｔｓｃｈｅｂｙｓｃｈｅｆ多项式等进行计算；温度垂直廓线不太光滑的，须用能近似表示廓线不太光滑部分的基本廓线进行分离，再用差分等计算，才能取得较好的结果。用理想场计算的例子表明：用上述方法计算的结果都比直接用差分等计算的结果好，特别是在计算位势高度和温度垂直平流时效果更为明显

A COMPARATIVE STUDY OF THE VERTICAL DIS-CRETIZATION OF ATMOSPHERIC MODELS

Discussions are made on the vertical discretization of those quantities related to the temperature.Analyses show that the computation of those quantities should be carried out by different methods for different cases.In the smooth vertical temperature profile case, usual methods,such as finite difference,Tschebyscheff polynomial and so on, may be used.In the unsmoothed vertical temperature profile case, however , it is better to separate the temperature into the basic temperature and the departure temperature T', such that can approximate the unsmoothed part of the profile and T' becomes smooth,and then better results can be obtained by usual methods. Computational examples based on ideal fields indicate that the results obtained by the above technique are, to a great extent, better than those directly obtained by usual methods,especially in computation of geopotential and vertical temperature advection in the unsmoothed vertical temperature profile case.