During the severe precipitation, intruding of weak cold air in the mid-and upper-level makes convection strengthened and precipitation reinforced.

强降水期间，中高层弱冷空气侵入使对流加强和降水强度加大。

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The polar ionosphere is strongly influenced by convection electric fields, auroral particle precipitation, and field-aligned electric currents etc.

极区电离层强烈地受到极区对流电场、极光粒子沉降和场向电流等的影响。

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Supposing that the level of free convection is equal to the cloud bottom level, we considered the pulling effects of simulated sub-grid scale precipitation, which is under clouds.

假设自由对流高度为云底高度，考虑模式模拟次网格尺度降雨的云下拖曳清除作用。

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