暴雨环境场非线性扰动特征

本文着重讨论大尺度运动中常被略而不计的非线性流场扰动和温湿场扰动的作用。为此选择三个不同类型的暴雨个例,分析表明需要重视非科氏力场中运动的特性,它表现出旋转流体自身的涡度场和散度场之间的相互作用引起暴雨系统的急剧变化。其次,环境场的层结稳定度水平扰动与垂直运动场的非线性相互作用也会激发出次级环流,促使暴雨过程发展。

THE CHARACTERISTICS OF NON-LINEAR DISTURBANCE IN THE ENVIRONMENT FIELD OF HEAVY RAIN

This paper lays stress on the effect of the non-linear disturbance of wind field and temperature and humidity field.From the analysis of different heavy rain cases, it is shown that great attention is required on motion characteristics in the non-Coriolis force field, which indicate abrupt and sharp changes in heavy rain processes.The non-linear interaction between horizontal disturbance of the stratified stability and vertical motion excites sub-synoptical scale circulation.It is closely related to the evolution of heavy rain processes.