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Development and Test of Hydrostatic Extraction Scheme in Spectral Model 被引量:2
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作者 张道民 盛华 纪立人 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1990年第2期142-153,共12页
The introduction of 'hydrostatic extraction' scheme, or 'standard stratification approximation', into spectral model gained some advantages compared with commonly used schemes. However, computational i... 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 parameter C0 taken as a constant. In this paper, the possible 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 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. 展开更多
关键词 Development and Test of hydrostatic extraction Scheme in spectral model
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An Impact of Hydrostatic Extraction Scheme on BMRC's Global Spectral Model
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作者 盛华 William Bourke Terry Hart 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1992年第3期269-278,共10页
There are two important features in geophysical fluid dynamics. One is that the atmospheric and oceanic equations of motion include the Coriolis force; another is that they describe a stratified fluid. The hydrostatic... There are two important features in geophysical fluid dynamics. One is that the atmospheric and oceanic equations of motion include the Coriolis force; another is that they describe a stratified fluid. The hydrostatic extraction scheme, or standard stratification approximation, posed by Zeng (1979), reflects the second aspect of geophysical fluid dynamics. There exist two major advantages in this scheme; accurate computation of the pressure gradient force can be obtained over steep mountain slopes, and the accumulation error in vertical finite differencing can be reduced, especially near the tropopause.Chen et al (1987) introduced the hydrostatic extraction scheme into a global spectral model, which attained preliminary success at low resolution. Zhang and Sheng et al (1990) developed and improved the hydrostatic extraction scheme in a global spectral model, in which C0, the parameter that represents the stratification of the reference atmosphere, changes not only with height, but also with latitude. The scheme has been incorporated BMRC's global spectral model (IAPB). Four 5-day forecasts have been performed to test the IAPB with the hydrostatic extraction scheme. Objective verifications demonstrate a positive effect of the hydrostatic extration scheme on BMRC's model, particularly at upper levels, over the tropics and the Antartic region. 展开更多
关键词 An Impact of hydrostatic extraction Scheme on BMRC’s Global spectral model
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A Global Spectral Model and Test of Its Performance 被引量:7
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作者 张道民 李金龙 +4 位作者 纪立人 黄伯银 吴万里 陈嘉滨 宋正山 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 1995年第1期67-78,共12页
A brief introduction is given of a global spectral model, its dynamical framework and diabatic physical processes involved. A number of real forecasts are shown to illustrate the forecasting capability of the model fo... A brief introduction is given of a global spectral model, its dynamical framework and diabatic physical processes involved. A number of real forecasts are shown to illustrate the forecasting capability of the model for various weather processes. It can even manage to predict some of those typical weather processes in summer which used to be difficult to forecasters. 展开更多
关键词 spectral model hydrostatic extraction forecast experiment
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