根据实测的不同垂直运动和降水发展机制的特点看，从降水云系的雷达回波中分离对流性和平流性成分是很重要的。Ｈｏｕｇｈｔｏｎ在３０年前就认为，水凝物增长机制出现差异，说明雨滴体积的分布也可能不同。这种分布取决于雨滴的增长是由过冷水的水汽淀积过程，还是由过冷水的 Based on the measured characteristics of different vertical and precipitation development mechanisms, it is important to separate the convective and advective components from the radar echoes of the precipitation clouds. Thirty years ago, Houghton concluded that there are differences in the mechanism of hydrometeors growth, suggesting that the distribution of raindrops may also vary. This distribution depends on whether the raindrops grow by the vapor deposition process of subcooled water or by the supercooled water