螺旋度应用研究综述

螺旋度是一个描述环境风场气流沿运动方向旋转和运动强弱的物理参数,它反映了大气的运动场特征,能够很好地描述大气运动的性质和特点。文中介绍了螺旋度的理论研究动态和主要应用结果,从螺旋度诊断天气系统领域的拓展,螺旋度自身理论的不断完善以及螺旋度在应用研究中存在的不足等方面进行分析,指出螺旋度是天气预报以及与暴雨有关研究工作的最好工具之一,同时对螺旋度应用的研究前景作了展望。

Advancement in Application of Helicity to Weather Forecasting

Helicity is a physical parameter describing the rotation movement along the air flow on the environmental wind field and the intensity of movement,can reflect and be used to describe the nature and features of atmospheric circulation.A review is made on the development in theoretical helicity researches and its application from the aspects of the expanding of application domain,the improvement of helicity theory,and the shortages and problems in application.The analysis results show that there exits close relation between helicity and torrential rain processes.The high helicity might be one of mechanisms for rain storm development,and the variation of helicity intensity gives a good clue to torrential rain occurrence.The prospects of helicity research and application are discussed.