暴雨与次天气尺度扰动和低空急流的生成

HEAVY RAINFALL AND FORMATION OF SUB-SYNOPTIC SYSTEMS

中文摘要:

      本文利用五层原始方程模式、实际的等压面高度和雨量资料进行了次天气尺度系统生成的数值试验,得到的结果是:考虑了潜热的热源作用,在雨区附近的低空产生了一条辐合线,辐合线上有一次天气尺度的涡旋。低空急流的风速廓线、垂直环流及其与暴雨的关系和平均结构一致。用干模式所作试验不能得到类似的结果。

英文摘要:

      A five-level PE-model was applied to simulate the formation of sub-synoptic systems using real data of rainfall amount and geopotentials. Experiment indicates that due to release of latent heat through condensation process in the numerical model a convergence zone and a sub-synoptic vortex develops in the precipitation region. The low level jet stream with scale about 500 km is located along the south side of heavy rain area. The wind profile, vertical circulation and location of low level jet reletive to the heavy rain area are in agreement with average structures of Mei-Yu front. The dry numerical model can not give similary results.