The water vapor mops up heat. As the vapor rises it leaves a cooler Earth behind. The water vapor rises and as it does the atmosphere becomes cooler and thinner and the water vapor eventually condenses. As it condenses the water vapor gives up its heat to the cold emptiness of space as the vapor returns to water and forms clouds or freezes and ultimately falls back to earth as rain, sleet, hail and snow.
Excerpts from Evidence for Negative Water Feedback
by Clive Best
Abstract: Positive linear climate feedback for combined water effects is shown to be incompatible with the Faint Sun Paradox. In particular, feedback values of ~2.0 W/m2K-1 favored by current GCM models lead to non physical results at solar radiation levels present one billion years ago. A simple model is described whereby Earth like planets with large liquid water surfaces can self-regulate temperature for small changes in incident solar radiation. The model assumes that reflective cloud cover increases while normalized greenhouse effects decrease as the sun brightens. Net water feedback of the model is strongly negative. Direct evidence for negative water feedback is found in CRUTEM4 station data by comparing temperature anomalies for arid regions (deserts and polar regions) with those for humid regions (mainly saturated tropics). All 5600 weather stations were classified according to the Köppen-Geiger climatology…
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