Using enthalpy as a prognostic variable in atmospheric modelling with variable composition

被引：18

作者：

Akmaev, R. A. ^{[1
]}

Juang, H. -M. H. ^{[2
]}

机构：

[1] Univ Colorado, CIRES, Boulder, CO 80309 USA

[2] NOAA NCEP Environm Modeling Ctr, Camp Springs, MD USA

来源：

QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY | 2008年 / 134卷 / 637期

关键词：

entropy; internal energy equation; thermodynamic potentials; virtual temperature;

D O I：

10.1002/qj.345

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Specific enthalpy emerges from a general form of the internal energy equation as a convenient prognostic thermodynamic variable tor atmospheric modelling with variable composition, including models of moist air. This choice presents a general and flexible alternative to the common formalism of virtual temperature employed ill most numerical weather prediction and climate models to account for the presence of water vapour and other constituents. The new approach eliminates the need tor additional terms in the energy equation. resulting from composition variations along the air-parcel trajectories and routinely neglected in models. This note presents a derivation of relevant equations from first principles and outlines the changes to existing model codes necessary to accommodate the new formulation. Published in 2008 by John Wiley & Sons, Ltd.

引用

页码：2193 / 2197

页数：5

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