| An Impact of Hydrostatic Extraction Scheme on BMRC’s Global Spectral Model |
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| 作者姓名： | Sheng Hu William Bourke Terry Hart |
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| 摘 要： | There are two important features in geophysical fluid dynamics. One is that the atmospheric and oceanic equa-tions 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 flu-id 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 pre-liminary 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 at-mosphere, 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.
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| 收稿时间： | 3 December 1990 |
An impact of hydrostatic extraction scheme on BMRC’s global global spectral model |
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| Sheng Hu,William Bourke,Terry Hart.An impact of hydrostatic extraction scheme on BMRC’s global global spectral model[J].Advances in Atmospheric Sciences,1992,9(3):269-278. |
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| Authors: | Sheng Hua William Bourke Terry Hart |
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| Institution: | Institute of Atmospheric Physics, Academia Sinica, Beijing,Australian Bureau of Meteorology Research Centre,Australian Bureau of Meteorology Research Centre |
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| Abstract: | 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 whichC
0, 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. |
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