Numerical Study on the Stability Dependence of Geostrophic Drag and Cross-Isobar Angle

[摘要] The equation of motion on the unstably stratified PBL under stationary, horizontally homogeneous, and barotropic conditions is numerically solved with the use of so-called simple K-theory.The numerical predictions on the stability dependences of the geostrophic drag coefficient Cg and the surface cross-isobar angle α0 agree with the observational data of Wangara and AMTEX on the average. In addition, the present calculations predict that α0 decreases as the value of ratio of the actual height of PBL Zi to the dynamical scale height kU*/ƒ increases. The tendency is found in the data of Wangara but not found in those of AMTEX.

[学科分类] 大气科学