A numerical study of gravity waves in the atmosphere: smooth and steep orography effects

[摘要] Two types of nonhydrostatic meteorological models are applied to modeling of front wave propagation: a finite-difference model based on a terrain-following coordinate transformation and a finite-element model based on triangular elements. The former is used for a relatively smooth orography, and the latter for steep surfaces. The front surface is described in both models by an equation for advection of a scalar substance, which is solved with a third- order semi-Lagrangian procedure. Various meteorological effects, the influence of stratification and the introduction of an inversion layer above an orographic obstacle are investigated and discussed.

[发布机构] Institute of Computational Mathematics and Mathematical Geophysics, SB RAS, 6, Akademika Lavrentieva pr., Novosibirsk; 630090, Russia^1

[效力级别] 计算机科学

[关键词] Co-ordinate transformation;Finite difference model;Meteorological effects;Meteorological models;Non-hydrostatic;Semi-Lagrangian;Terrain following;Triangular elements