在我们继续下去之前是很有帮助的评论这Q / A -[云气体、液体或固体?][1]理解这个问题的关键是要意识到这是失踪的比较。并对流降水产生更重的降雨相比其他形式的降水?当我们观察不同类型的降水和各自的尺度上希望我们能明白为什么对流降水产生更重的降雨。所以有两种形式的降水(对流)[2]和[层状][3]。我将提供两种类型的降水的定义基于意味着大气的垂直速度的大小。所以平均垂直速度(从观察中获得)的平均(垂直速度)[4]在大气体积被研究(在这种情况下,云(s)的问题)。所以层状降水被定义为w美元< < V_{冰,典型}和w美元> 0美元。w是平均垂直速度和美元V_{冰,典型}$是冰晶的终端沉降速度和雪(一般在1 - 3 m $ s ^{1} $)对流降水被定义为w美元\大约V_{冰,典型}和w范围在1到10美元$ s ^{1}的值,有时超过美元V_{冰,典型}$这些定义将亨利·霍顿如图所示从参考[降水机制和人工修改][5]。也层状降水发生主要来自雨层云从积雨云云和对流降水发生。现在让我们不同类型的列表(不稳定大气中)[6]和的鳞片进化(任何云形成由于不稳定大气中)1)[条件不稳定][7]/[对流不稳定][8]-(通常小于10公里水平)和时间尺度——几分钟2)[对称不稳定][9]——水平(200公里)和时间尺度——几个小时3)(斜压不稳定)[10](不到2000公里水平)和时间尺度最大的2 - 3天。 Now let us match the speed of the vertical motions in the atmosphere with the scales at which a particular instability evolves. I am going to exclude symmetric instability from this discussion. Frontal systems(baroclinic instability), systems affected by topographic lifting and large scale horizontal convergence produce stratiform precipitation and continuous rain. In this case growth occurs by deposition of vapor particles and aggregation of ice particles. Because of the slow updrafts we typically see continuous rainfall spread over a large distance and slowly varying over time. Localized rain associated with either conditional instability or convective origin produce updrafts of several meters per second. There is not enough time for full growth of precipitation particles. Initial growth occurs just above the cloud base and since the time for growth is very short and rain drops grow mainly by [accretion of rain drops][11]. Heavy rainfall realized over a short period is balanced by the smaller horizontal scale of the event. When convective rainfall is observed over a large horizontal area usually it is balanced by areas that have a) either no rain b) areas having stratiform precipitation. **References** [Cloud Dynamics by Robert Houze][12], Chapter 6 [1]: //www.hoelymoley.com/questions/5380/are-clouds-a-gas-liquid-and-or-solid [2]: http://glossary.ametsoc.org/wiki/Convective_precipitation [3]: http://glossary.ametsoc.org/wiki/Stratiform_precipitation_area [4]: http://glossary.ametsoc.org/wiki/Vertical_velocity [5]: https://journals.ametsoc.org/doi/pdf/10.1175/1520-0450%281968%29007%3C0851%3AOPMATA%3E2.0.CO%3B2 [6]: https://en.wikipedia.org/wiki/Atmospheric_instability [7]: http://glossary.ametsoc.org/wiki/Conditional_instability [8]: http://glossary.ametsoc.org/wiki/Convective_instability [9]: http://glossary.ametsoc.org/wiki/Symmetric_instability [10]: http://glossary.ametsoc.org/wiki/Baroclinic_instability [11]: http://glossary.ametsoc.org/wiki/Accretion [12]: https://www.amazon.com/Cloud-Dynamics-104-International-Geophysics/dp/0123742668