云底距离地面测站的垂直距离，以米为单位。
研究了云底高度和云层厚度在不同天气下的变化情况。
The variation of the cloud-base height and cloud thickness in different weather is researched.
云中过冷水含量与云底高度为负相关，与过冷层厚度为正相关。
The super-cooled water content in the cloud has a negative correlation with the height of cloud base, and has a positive correlation with the thickness of super-cooled layer.
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。
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.
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