positive potentials meaning in Chinese

正电位

Through analysis of potential vorticity in isobaric surface field , in low - troposphere a positive potential vorticity disturbance exist and form incline disturbance column northward before rainstorm generation , at the same time have also reflected positive potential vorticity disturbance for severe convection weather trigger role in lower - troposphere ; soon positive potential vorticity disturbance in high - troposphere downward , form one vertical disturbance column , now corresponding precipitation develop stage ; in the prosperous stage of rainstorm that maintains isolines of horizontal distribution and still have straight positive potential vorticity disturbance in 600 - 700 hpa isobaric surface field ; when near ground arises negative potential vorticity disturbance , precipitation also weaken
通过对等压面的位涡分析，发现了在暴雨发生前，在对流层低层有正位涡扰动存在并向北形成倾斜的扰动柱，同时也反映了对流层低层正位涡扰动对强对流天气的触发作用；随后高层正位涡向下扰动，形成一个垂直扰动柱，这时对应降水的发展阶段：在暴雨的鼎盛阶段， 600 700hpa上空维持水平分布的等值线，在其上还有正的位涡扰动；当近地面出现负的位涡扰动时，降水随之也减弱。