摘要
本文采用视热源方程,视水汽汇方程,扰动能量方程和涡度方程对1979年6月的三次低涡进行了分析和研究,得到了以下结论:在低涡生成和发展过程中,积云和乱流引起的总热量的垂直涡旋输送很大。当大气处于条件不稳定时,γ_s<γ<γ_α,积云和乱流的这种输送结果,使得低涡的正涡度增长上升到较高层次;另外,积云和乱流对总热量的垂直涡旋输送使得低涡内扰动有效位能增加,然后向扰动动能转换,使低涡得以生成和发展。
Three vortices,which happened over the Qinghai-Tibet Plateau in June of 1979,are estimated in this paper by using apparent heat source equation,apparent moist sink equation,perturbationenergy equations and vorticity equation.During the genesis and development process of the vortices,the vertical eddy transport of to-tal heat(sensible heat and latent heat)caused by cumulus and turbulence is very important.When the atmosphere is conditional instability,the eddy transport by cumulus and turbulencemakes the layer of the increment of vortices absolute vorticity higher.In addition,the eddy trans-port of total heat makes disturbance effective potential energy increase and then it is transformedinto disturbance kinetic energy.Thus,the vortices will generate and develop.
出处
《应用气象学报》
CSCD
北大核心
1992年第2期198-205,共8页
Journal of Applied Meteorological Science
