A Vertical Grid Module for Baroclinic Models of the Atmosphere

Drake, John B¹ 

[1]ORNL

关键词: ACCURACY;    ADVECTION;    APPROXIMATIONS;    ATMOSPHERIC CIRCULATION;    BOUNDARY CONDITIONS;    LAGRANGIAN FUNCTION;    THERMODYNAMICS;   

DOI  :  10.2172/969953
RP-ID  :  ORNL/TM-2008/085
PID  :  OSTI ID: 969953
Others  :  Other: KP1206000
Others  :  ERKP576
Others  :  TRN: US201002%%1186

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The vertical grid of an atmospheric model assigns dynamic and thermo- dynamic variables to grid locations. The vertical coordinate is typically not height but one of a class of meteorological variables that vary with atmo- spheric conditions. The grid system is chosen to further numerical approx- imations of the boundary conditions so that the system is terrain following at the surface. Lagrangian vertical coordinates are useful in reducing the numerical errors from advection processes. That the choices will effect the numercial properties and accuracy is explored in this report. A MATLAB class for Lorentz vertical grids is described and applied to the vertical struc- ture equation and baroclinic atmospheric circulation. A generalized meteo- rolgoical coordinate system is developed which can support σ, isentropic θ vertical coordinate, or Lagrangian vertical coordinates. The vertical atmo- spheric column is a MATLAB class that includes the kinematic and ther- modynamic variables along with methods for computing geopoentials and terms relevant to a 3D baroclinc atmospheric model.