孤立子型热源强迫——导致局地副高单体增强的一种可能机制

Thermal Forcing with Soliton Pattern——A Possible Mechanism of Reinforcing Local Subtropical High Cell

结合夏季东亚大陆季风雨带(梅雨带)强对流降水过程中局地凝结热强迫作用的天气实际,从动力学上探讨了这类局地热源扰动的强迫作用对该地区位势场和风场的影响及其可能出现的天气系统的响应模态.研究结果表明,局地“狭窄”的准孤立子型的热力强迫作用可以激发出较为“宽广”的准孤立子型的位势场和风场的响应,从而对夏委东亚大陆梅雨期间局地范围内副高单体的生成和增强机制提供了一种可能的动力学途径,同时也对分析和预报夏季西太平洋副高在东亚副热带地区中短期的强度变化和进退活动给出了一种参考.

Based on the actual weather characters of local condensation potential thermal forcing in strong convection precipitation process of monsoon rain belt over East Asia conti-nent in summer,the responding potential fields and wind fields as well as possible responding synoptic mode influenced by local thermal forcing are studied and discussed by using the dynamic method. The research results show that local 'narrow' thermal forcing with the quasi-soliton pattern can excite 'wide' response of potential fields and wind fields with the same pattern, and also provide a possible dynamical way for studying the out-growth and reinforcement mechanism of subtropical high cell over East Asia continent during the plum rains period in summer. The main conclusions in this paper can provide a reference for diagnosing and predicting the West Pacific subtropical hign's middle and short period intensity and advance shirk over East Asia continent in summer.