沙尘暴中的能量反馈

Energy Feedback in Dust-storm

沙尘暴是一种风沙灾害天气。在沙尘暴发生后,尘暴中浓密的沙尘对系统的涡旋能量有调节作用,从而导致沙尘暴具有区别于风暴的行为模式。从沙尘暴的微观结构及涡旋能量入手,分析了尘暴中沙尘有效辐射效应形成的条件,认为沙尘暴在沙尘颗粒参与下,沙尘有效辐射效应对锋面前后涡旋能量的调整是重要的能量反馈机制,认为辐射效应有着时间与区域的不同,从而导致沙尘暴在白天发展、持续,在夜间消亡,其发生频率随纬度升高显现日期延后的现象。分析认为,沙尘暴中类似于风暴体的结构是沙尘暴的核心所在,其中存在的能量反馈机理有规律性,利用这种机制可帮助调控沙尘暴,指导制定减灾政策。

Dust-storm is a wind sand disaster weather. After dust-storm, the dense sand dust in the storm can adjust vortex energy, which made the dust storm different from the windy weather. Based on the study on the microstructure of dust storm and vortex energy, the formative condition of effective radiation effect of dust storm is analyzed. It is thought that, with sand and dust particle in dust storm, radiation effect of dust storm feedback mechanism for pre and post front vortex energy adjustment and radiation effect changes is an important with time and region, which result the phenomena that the dust storms develop and continue during daytime and vanish at night, and the frequency increases with latitudes. The analysis shows that the storm is the kernel of the storm system and energy feedback mechanism is of some regularity. The mechanism can be used to control dust stoma and make strategy for disaster reduction.