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NUMERICAL PROGNOSIS INCLUDING NON-ADIABATIC WARMING

G. J. HaltinerUnited States Naval Postgraduate School

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Yeh-chum WangChinese Naval Postgraduate School, Taiwan

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Abstract

A model for numerical prediction of the 1000-mb surface is developed which includes a term expressing the interchange of sensible heat between the air and the underlying surface as well as the effect of terrain-induced vertical motion. In spite of the crudeness of the non-adiabatic representation, the model shows a definite improvement over a similar adiabatic model when the two are compared in a series of prognoses. Moreover, when monthly mean isotherms may be used to represent the temperature of the underlying surface, the non-adiabatic term may be combined with the orographic term and the earth's vorticity so that there is no work added to the prognostic routine.

Abstract

A model for numerical prediction of the 1000-mb surface is developed which includes a term expressing the interchange of sensible heat between the air and the underlying surface as well as the effect of terrain-induced vertical motion. In spite of the crudeness of the non-adiabatic representation, the model shows a definite improvement over a similar adiabatic model when the two are compared in a series of prognoses. Moreover, when monthly mean isotherms may be used to represent the temperature of the underlying surface, the non-adiabatic term may be combined with the orographic term and the earth's vorticity so that there is no work added to the prognostic routine.

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