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Ziggurat · 1st July 2010, 12:48 PM

Originally Posted by wogoga

Ultimately, me too, I consider lapse rate rather an effect of surface temperature than a cause of it. Otherwise, (as far as I can see) I would have to retract this statement of post #1:

And if it were possible to cool down the whole planet Venus to zero degree Celsius, its temperature would remain near water freezing point over millions of years.

Cheers, Wolfgang

Then you better get ready to retract that statement, because it's NOT simply a function of surface temperature, as I detailed here.

The surface of Venus does receive some heating from the sun. But if the surface is frozen, then it won't lose much heat from radiation, and it will lose NO heat from convection (which it currently does, which is why the adiabatic lapse rate matters). So it won't need a lot of heating to unfreeze it, and it won't last close to a million years at that temperature.

1st July 2010, 12:48 PM	#53
Ziggurat Penultimate Amazing Join Date: Jun 2003 Posts: 51,259	Originally Posted by wogoga Ultimately, me too, I consider lapse rate rather an effect of surface temperature than a cause of it. Otherwise, (as far as I can see) I would have to retract this statement of post #1: And if it were possible to cool down the whole planet Venus to zero degree Celsius, its temperature would remain near water freezing point over millions of years. Cheers, Wolfgang Then you better get ready to retract that statement, because it's NOT simply a function of surface temperature, as I detailed here. The surface of Venus does receive some heating from the sun. But if the surface is frozen, then it won't lose much heat from radiation, and it will lose NO heat from convection (which it currently does, which is why the adiabatic lapse rate matters). So it won't need a lot of heating to unfreeze it, and it won't last close to a million years at that temperature.
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