rain water

Tropical rain recycling

Water must be along with oxygen amongst the most important provision to life. Useable water is essential. Water movements on earth are central to climate and life. The process is a little like the chicken and egg but if one starts with water evaporation from oceans, accumulates in the atmosphere, followed by coalescence and falling as rain or snow. Some directly into the oceans, other on land and enters the terrestrial water cycle. A very complex process.
Tropical ocean waters evaporate, the water is lifted to cloud level by convection and transported towards the poles and lost progressively as rain or snow.
Rain sometimes in hot regions never reaches the ground but evaporates again in the sky. This depends upon the ambient relative humidity
Rahn T in Nature 2007, vol 445, pp495-6.
Worden et al Nature 2007, vol 445, pp 528-531.

Martin Eastwood
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