边界层风场调整的分析

ON PBL WIND ADJUSTMENT

分析任意气压场在中性、非线性正压边界层中风场的调整问题。结果表明：任意初始风场，将向给定的气压调整。具休调整过程是通过绝对涡度振荡及粘性系数的耗散，其调整的时间尺度为［Ｏ（ｔ￣（－３／２））］，比自由大气地转适应时间尺度［Ｏ（ｔ￣（－１））］快。

The paper is devoted to the problem of the role of an presstire field in the adjustmentof the wind in a neutral nonlinear barotropic planetary boundary layer(PBL);Evidence suggeststhat any initial wind field will adjust itself towards a given pressure pattern through absolute vor-ticity oscillation and viscous coefficient dissipation,leading to the adjustment time scale,faster than[O(t￣(-1)] for quasi geostrophic adaptation in the free atmosphere.