Inversion effects on wind and surface pressure in atmospheric front propagation simulation with a hyperbolic model

International Conference on Computational Information Technologies for Environmental Sciences 2017

生态环境科学;计算机科学

Yudin, M.S.^1

Institute of Computational Mathematics and Mathematical Geophysics SB RAS, Novosibirsk, Russia^1

关键词: Artificial compressibility;    Atmospheric fronts;    Compressible Navier-Stokes equations;    Governing equations;    Hyperbolic models;    Meteorological effects;    Stratified atmosphere;    Surface wind speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/96/1/012002/pdf
DOI  :  10.1088/1755-1315/96/1/012002

来源: IOP

【 摘 要 】

In this paper the effects of an inversion layer in a stratified atmosphere on the surface wind speed and pressure are investigated with models based on the compressible Navier-Stokes equations in two dimensions. Artificial compressibility is introduced into the models in order to make the governing equations hyperbolic. For comparison with available simulation data, the physical processes under study are assumed to be adiabatic. Plain orography is considered in surface pressure simulations with a finite-difference version of the model, while surface wind speed effects are estimated in artificial cold front propagation over a hill with a finite-element version of the model. 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. The results of simulations show various meteorological effects in agreement with observations and in accordance with a theory proposed by Charba [3].