A note on finite-difference schemes for the surface and planetary boundary layers

摘要: The solution of the planetary boundary-layer equations by finite-difference methods has recently become very popular. Among recent papers using such methods, several use somewhat arbitrary meshes and some do not make a constant flux or wall layer near ground. It is shown that finite differences right down to ground can be inaccurate procedure when used in conjunction with an eddy viscosity mixing length proportional (z +z0) orz Such approach lead results are highly dependent on scheme virtually independent roughness length,z0. A expanding grid, based form chosen for viscosity, proposed which gives good without surface case neutrally stratified atmosphere.