A ONE-LEVEL MESOSCALE MODEL FOR DIAGNOSING SURFACE WINDS IN MOUNTAINOUS AND COASTAL REGIONS - COMMENTS

P ALPERT

A ONE-LEVEL MESOSCALE MODEL FOR DIAGNOSING SURFACE WINDS IN MOUNTAINOUS AND COASTAL REGIONS - COMMENTS

School of the Environment and Earth Sciences

Research output: Contribution to journal › Comment/debate

Abstract

Mass and Dempsey (1985) have reformulated the equations for the one-level sigma-system model over complex terrain and suggested they have removed the large hydrostatic part of the horizontal pressure-gradient force (PGF). It is shown that although the coefficient of g∇σZs was greatly reduced (compared to 1), the complete elimination of the hydrostatic PGF cannot be done unless the surface temperature is redefined as the sum of a perturbation temperature and a basic rest-state temperature. The alternative formula in which the hydrostatic PGF terms were totally removed is presented.

Original language	English
Pages (from-to)	1108-1109
Journal	Monthly Weather Review
Volume	117
Issue number	5
State	Published - May 1989

Cite this

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abstract = "Mass and Dempsey (1985) have reformulated the equations for the one-level sigma-system model over complex terrain and suggested they have removed the large hydrostatic part of the horizontal pressure-gradient force (PGF). It is shown that although the coefficient of g∇σZs was greatly reduced (compared to 1), the complete elimination of the hydrostatic PGF cannot be done unless the surface temperature is redefined as the sum of a perturbation temperature and a basic rest-state temperature. The alternative formula in which the hydrostatic PGF terms were totally removed is presented.",

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N2 - Mass and Dempsey (1985) have reformulated the equations for the one-level sigma-system model over complex terrain and suggested they have removed the large hydrostatic part of the horizontal pressure-gradient force (PGF). It is shown that although the coefficient of g∇σZs was greatly reduced (compared to 1), the complete elimination of the hydrostatic PGF cannot be done unless the surface temperature is redefined as the sum of a perturbation temperature and a basic rest-state temperature. The alternative formula in which the hydrostatic PGF terms were totally removed is presented.

AB - Mass and Dempsey (1985) have reformulated the equations for the one-level sigma-system model over complex terrain and suggested they have removed the large hydrostatic part of the horizontal pressure-gradient force (PGF). It is shown that although the coefficient of g∇σZs was greatly reduced (compared to 1), the complete elimination of the hydrostatic PGF cannot be done unless the surface temperature is redefined as the sum of a perturbation temperature and a basic rest-state temperature. The alternative formula in which the hydrostatic PGF terms were totally removed is presented.

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A ONE-LEVEL MESOSCALE MODEL FOR DIAGNOSING SURFACE WINDS IN MOUNTAINOUS AND COASTAL REGIONS - COMMENTS

Abstract

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