Vertical distributions of cloud water, cloud graupel water and vertical velocity further approved the low level characteristics of cold airstream precipatition.
云水含量、云中霰含量和上升速度的垂直分布进一步证实了冷流降水的低空性。
Ice crystals are the main sources of graupels, which are produced mainly by auto conversion from ice crystal to graupel and a few grow by collection of ice crystals.