高空具有高湿位势涡度值的干冷空气叠加在低层扰动上，有利于不稳定层结的加强和降水发生。
The upper level dry and cold air with high moist potential vorticity value was superposed to the low-level disturbance, which was advantageous to instability stratification strength and precipitation.
通过中性和不稳定层结条件下不同叶面积指数算例的模拟分析及与已有观测结果的比较表明，本文所建大涡模式对森林冠层和森林边界层有较好的模拟效果。
The analysis of simulation results and the comparison with observational data show that the LES model simulates the turbulent flow in forest canopy and forest boundary layer very well.
对流层高层或平流层低层高位涡的下传有利于位势不稳定能量的释放，使得暴雨增幅。
The tropopause folding, which means that high PV spreads downward from the upper troposphere or stratosphere, helps the releasing of potential instability energy and the development of rainstorm.
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