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Politics : The Environmentalist Thread -- Ignore unavailable to you. Want to Upgrade?

To: Thomas A Watson who wrote (18966)	12/26/2007 11:00:07 PM
From: neolib	Read Replies (1) \| Respond to of 36921

I already commented on that. Read to the end of that description and notice how the polyethylene greenhouse functions at night. Now, do you think either greenhouses or the earths atmosphere and climate function only during daylight hours? What you fail to understand, and what the authors failed to make a point of, is that both the greenhouse and the earth system store a lot of heat during the day, and the equations are applied for both day and night and we are interested in the long term equilibrium temperature. That is the whole point of the greenhouse equations: What is the equilibrium temperature of something which absorbs a certain incoming EM spectrum and radiates and different EM spectrum. In the case of a greenhouse, you'll get an average equilibrium in a few days or a week or so. For the earth, it is many decades. Sure that is a difference. However, both are longer than a day and average night and dark, and both are based on radiation, not convection. Of course, the author also failed to point out that the ratios of heat capacity between surface and gas in a greenhouse is much different than for surface & atmosphere in the earth, given the thickness of the gas column for each. Details...