Development and Test of Hydrostatic Extraction Scheme in Spectral Model
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Graphical Abstract
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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 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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