廖洞贤,胡铭. 1997. 大气模式垂直离散的比较研究[J]. 气象学报, 55(4):430-439, doi:10.11676/qxxb1997.043
大气模式垂直离散的比较研究
A COMPARATIVE STUDY OF THE VERTICAL DIS-CRETIZATION OF ATMOSPHERIC MODELS
投稿时间:1996-04-29  修订日期:1996-07-08
DOI:10.11676/qxxb1997.043
中文关键词:  垂直离散  不连续  Tschebyschef多项式
英文关键词:Vertical discretization  Discontinuity  Tscheby sceff polynomial
基金项目:国家自然科学基金项目49575268号
作者单位
廖洞贤 南京气象学院, 南京, 210044 
胡铭 南京气象学院, 南京, 210044 
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中文摘要:
      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.
英文摘要:
      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 soon,may be used.In the unsmoot hed vertical temperature profile case,how ever,it is better to separate the temperature into the basic temperature and the departure temperature T',such that can appro ximate the unsmoothed part of the profile and T' beco messmooth,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 obt ined by usual methods,especially in computation of geopotential and vertical temperature advection in the unsmoothed vertical temperature profile case.
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