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Old 05-29-2004, 08:07 AM
Starfury Starfury is offline
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Quote:
Originally Posted by genius
rather rare. the best example is the eruption of the st. helens in 1980, the dust it carried into the atmosphere actually caused colder weather for a few years. that way we had more white christmases in the early 80s. it was great, we had so much fun in snowball battles, sleighing and i built the most wonderful snowmen:-)
Thanks for agreeing with at least one simplification

Quote:
but about all clouds consist of condensated and frozen water. and they cause less energy to be absorbed from the sun, which is easily understandable: in the sun it is warmer than under cloudcover; also from space cloudcover is white and water/land rather dark. bodies with dark surfaces get hotter in the sunlight than bright ones do.

that is not true. clouds make it colder, however watervapor in the atmosphere that is not condensated into clouds does work as a greenhouse gas like CO2, CH4..., letting VIS range EM pass but absorbing in the IR range.
Now for my other simplification.

What you're saying is true, but as additional clouds are the result of more humidity in the air, the overall effect is still a warming.

The condensated water in the form of clouds will in fact reduce the overall effect of the warming generated by the added evaporated water in the atmosphere (otherwise at some point we could pick boiled lobsters right out of the ocean ), but it will not cool the Earth back down.
(Especially, since the warming will cause the atmosphere to absorb more water-vapor and less ice and snow will also mean less reflection on the surface)
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