THE INFLUENCE OF STRATIFICATION ON FRONTOGENESIS CAUSED BY GEOSTROPHIC ADJUSTMENT^*

A uniform,inviscid,incompressible fluid in a two-dimensional plane(x,z)is considered.Three principles:conservation of potential vorticity,conservation of absolute momentum,and conservation of mass are used for this study.If the initial mass field and the initial wind field do not satisfy geostrophic balance,then through geostrophic adjustment under suitable conditions,the frontogenesis will finally occur.Our work points out that the initial density distribution greatly influences the frontal features.If the stratification in cold air is the same as that in warm air,two frontogeneses will occur at top and bottom boundaries respectively.If the stratification in cold air is larger than that in warm air,the frontogenesis at the bottom boundary still exists,but the other at the top boundary disappears.This result makes us further understand the mechanism of the frontogenesis in the real atmosphere.