| Development and Test of Hydrostatic Extraction Scheme in Spectral Model |
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| 作者姓名： | Zhang Daomin Sheng Hu Ji Liren |
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| 作者单位： | Institute of Atmospheric Physics，Academia Sinica.Beijing 100080，Institute of Atmospheric Physics，Academia Sinica.Beijing 100080，Institute of Atmospheric Physics，Academia Sinica.Beijing 100080 |
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| 摘 要： | The introduction of “hydrostatic extraction” scheme, or “standard stratification approximation”, into spectral model gained some advantages compared with commonly used schemes. However, computational instability may oc-cur for high vertical resolution versions if the stratification parameter C0 taken as a constant. In this paper, the pos-sible cause leading to the instability is discussed and an improved scheme presented where C0 is generalized to be a function of both height and latitudes. Hence the reference atmosphere gets closer to the real atmosphere and the tem-perature deviation field to be expanded becomes smoother everywhere. Test by real case forecasts shows good computational stability of the new scheme and better prediction performance than usual schemes of spectral model.
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Development and test of hydrostatic extraction scheme in spectral model |
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| Zhang Daomin,Sheng Hu,Ji Liren.Development and Test of Hydrostatic Extraction Scheme in Spectral Model[J].Advances in Atmospheric Sciences,1990,7(2):142-153. |
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| Authors: | Daomin Zhang Hua Sheng Liren Ji |
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| Institution: | Institute of Atmospheric Physics, Academia Sinica, Beijing 100080,Institute of Atmospheric Physics, Academia Sinica, Beijing 100080,Institute of Atmospheric Physics, Academia Sinica, Beijing 100080 |
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| Abstract: | The introduction of “hydrostatic extraction” scheme, or “standard stratification approximation”, into spectral model gained
some advantages compared with commonly used schemes. However, computational instability may occur for high vertical resolution
versions if the stratification parameterC
0 taken as a constant. In this paper, the possible cause leading to the instability is discussed and an improved scheme presented
whereC
0 is generalized to be a function of both height and latitudes. Hence the reference atmosphere gets closer to the real atmosphere
and the temperature deviation field to be expanded becomes smoother everywhere. Test by real case forecasts shows good computational
stability of the new scheme and better prediction performance than usual schemes of spectral model.
This work has been carried out under the support of the Medium-range Numerical Weather Forecast research project. |
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