ON THE MECHANISM OF WINTER CYCLOGENESIS IN RELATION TO VERTICAL AXIS TILT

Abstract

This work is at providing some understanding of link between kinetic energy conversion and the vertical axis tilt of cyclogensies . the analysis of the kinetic energy budget is made for a cyclonic development over the energetic of the spatial and temporal variations of the energetic of the depression were presented. The analysis of typical Mediterranean depression in the period 18-25 Jan

1981 , one of the most significant features obtained is the increase of K.E with in the layer 500-200 h Pa especially in the growth period of cyclogensies . the tilting term ( T' V') is fond to change is sign and behavior in the growth and decay period . Also the work focused on the couplling mechanism of sinking at warmer latitudes and rising of colder latitudes which oppears to be a very effective mechanism for maximum production of Az on the destruction of Kz.The upper tropospheric jet stream was found to be major contributing source of Kz , most of this energy was found to be above 400 h Pa.