A Simple Gravity Wave Drag Parametrization for Use in Medium-Range Weather Forecast Models

被引：44
|
作者：
Chouinard, C. [1 ]
Beland, M. [1 ]
McFarlane, N. [2 ]
机构：
[1] Atmospher Environm Serv, Dorval, PQ H9P 1J3, Canada
[2] Atmospher Environm Serv, Canadian Climate Ctr, Downsview, ON M3H 5T4, Canada
来源：
ATMOSPHERE-OCEAN | 1986年 / 24卷 / 02期
关键词：
D O I：
10.1080/07055900.1986.9649242
中图分类号：
P4 [大气科学（气象学）];
学科分类号：
0706 ; 070601 ;
摘要：
A simple gravity wave drag parametrization over mountainous terrain is tested for its ability to reduce the systematic errors of medium-range weather forecasts. Following Boer et al. (1984), this parametrization is a function of the low-level wind speed and stability, the local Froude number, and the variance of the subgrid-scale orographie features. A comparison study of ten 7-day forecasts obtained with envelope orography, wave drag or standard orography, shows that wave drag is as effective as envelope orography in reducing the systematic errors. A further comparison where the combined effects of the wave drag and that of a complementary enhanced orography (that is one that includes only the subgrid-scale elements not treated separately by wave drag) are taken into account shows this latter approach to be the most promising in reducing orographically-related systematic errors.
引用
收藏
页码：91 / 110
页数：20
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