Re: That global warming thingy

In article <46s8v2trnsa0u3rhk06aqu6vig9n82df8l@xxxxxxx>, John Larkin wrote:
On Sun, 11 Mar 2007 19:34:58 +0000 (UTC), don@xxxxxxxxxxxxxx (Don
Klipstein) wrote:

There is no category 6, and it appears to me that on average it takes
2-3 degrees F warmer water to make hurricanes a category worse.

But hurricanes aren't powered by temperature; they're powered by
temperature differentials, like any other heat engine. So they'll get
worse if the water-air differential increases.

Isn't the presumed GW water temp increase being heated by the air?
More C02 absorption in air would seem to me to reduce air-water temp
differential, not increase it.

The air gets warmed by the surface more than the other way around.

Meanwhile, what powers hurricanes is the temperature differential
between the water surface and the upper troposphere, as well as water
vapor.

Greenhouse gases will warm the surface. Since greenhouse gases radiate
heat away into outer space as well as towards the surface, they can have
some cooling effect on air well aloft. Warming well aloft appears to me
to be mainly from convection from a warmer surface. The upper troposphere
will only warm up as much as the surface where convection from the
surface to the upper troposphere is constant - maybe this gets close
enough to true in tropical rainforest areas.

Also, water vapor concentration will increase with temperature.

- Don Klipstein (don@xxxxxxxxx)
.

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