Скачать или смотреть Rainfall formation I Bergeron I Collision/Coalescence

An average-sized raindrop contains several million times as much water as the average-sized water droplet found in any cloud. Consequently, great multitudes of droplets must join together in order to form a drop large enough to overcome both turbulence and evaporation and thus able to fall to Earth under the influence of gravity.
It is still not well understood why most clouds do not produce precipitation, but two mechanisms are believed to be principally responsible for producing precipitation particles: (1) ice-crystal formation and (2) collision and coalescence of water droplets. #rainfall #precipitation by ice-crystal formation was first proposed by the Swedish meteorologist Tor Bergeron more than half a century ago. It is now known as the Bergeron process and is believed to account for the majority of precipitation outside of tropical regions.

Collision/Coalescence – In many cases, particularly in the tropics, cloud temperatures are too high for the crystals to form. In such clouds, rain is produced by the collision and coalescing (merging) of water droplets.

00:00:00 Raindrop formation process
00:09:33 Forms of Precipitation
00:23:10 Types of Precipitation
00:35:00 Hydrological Cycle
00:44:40 Stability