THE FORMING OF SUBSYNOPTIC SCALE LOW-LEVEL JET STREAM
Gao Shouting Sun Shuqing (Institute of Atmospheric Physics, Academia Sinica)
The article presents that the supergeostrophic wind of subsynoptic scale low-level jet stream is mainly caused by the isallobaric wind superimposing on the geostrophic wind field. The adiabatic mass adjustment of upper-low layer, which caused by upper tropospheric divergence bringing about lower layer convergence, is an important factor of forming the isallobaric wind. It is emphasized that the direct feed-back effect of heavy rain on the jet stream is to increase the isallobaric wind. Furthermore, through the diagnostic analysis of an example, a number of points above-mentioned are verified.