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

International Conference and Early Career Scientists School on Environmental Observations, Modelling and Information Systems

生态环境科学;计算机科学

Yudin, M.S.^1

Institute of Computational Mathematics and Mathematical Geophysics, SB RAS, 6, Akademika Lavrentieva pr., Novosibirsk

630090, Russia^1

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

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/48/1/012024/pdf
DOI  :  10.1088/1755-1315/48/1/012024

来源: IOP

【 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.