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Politics : The Environmentalist Thread

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To: Thomas A Watson who wrote (11284)	4/8/2007 4:09:33 PM
From: maceng2	of 36917

I didn't mention global warming. I wasn't talking about that. I am not talking about CO2 concentrations. I am not talking about ice crystal formation. I am not talking about the desert. I am not even yet talking about the ocean. I am talking about the surfaces and heat profile over depth of two otherwise similar soils. One is dark the other is light. All other conditions being the same.(this is the subject of the original post I made if anyone cares to check) During the day there will be a net influx of radiant heat energy into both surfaces, and during the night a net outward flux. During the day the soils will heat up from radiation, and during the night they will cool down by radiating the extra heat out into space. Heat transport into the soil will be governed by the laws of diffusion. The diffusion of heat into a soil is approximated by Ficks laws.. Fick's first law The diffusion flux is proportional to the concentration gradient; this relationship is employed for steady-state diffusion situations. Fick's second law The time rate of change of concentration is proportional to the second derivative of concentration; this relationship is employed in nonsteady-state diffusion situations. diracdelta.co.uk It can be seen more heat will be transported into the soil to a greater depth by the darker material as it reflects less heat back into space. The reason:- the concentration of heat will be higher at the surface of the darker soil. For the darker surface, this heat will take longer diffuse back out during the cooler night period, even though the surface will radiate it out preferentially. The transport of heat back out will be limited by the thermal conduction coefficient of the soil. The limiting factor in the heat loss equation. en.wikipedia.org Thus, over time (several days and nights), the darker surface will become warmer then the lighter surface. Do you agree?

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