Brian porzio on dating in the dark
If you try, then you will usually diagnose positive feedback, even if strongly negative feedback exists.
Our most complete analysis of the effect was described here.
Unfortunately, a Google search on “greenhouses” and “energy budget” is hopelessly cluttered with pages related to the Earth’s greenhouse effect (wow! ) If anyone is aware of studies done on the energy budget of greenhouses (of the agricultural kind), I would appreciate a reference or two.
But until someone finds a serious error in the above analysis, I’d say we might need to admit that the “greenhouse effect” is pretty accurately named. Meteorology, 1973) who has been referenced by many as showing a greenhouse does not work through the greenhouse effect, but he curiously admits the analogy “is correct only with respect to the glass, not with respect to the space enclosed”. That’s the point…the glass produces a greenhouse effect.
In contrast, the extra IR energy “input” (actually, reduced IR “loss”) is twelve times as large (100 W/m2) as the reduction in the convective loss (8 W/m2).
I’m pretty convinced that most of our detractors on the subject don’t even know what we are talking about.
The refutations against our work have been a mixture of strawman arguments, red herrings, silliness, and deception.
While working on a new website devoted to answering greenhouse questions, I decided to examine this issue.
What piqued my interest was a couple quick back-of-the-envelope calculations that (1) for a glass covered greenhouse, the downward infrared (IR) emission from the roof should be about 100 W/m2 more than from a clear sky (a pane of glass is high emissivity, and opaque to broadband infrared), and (2) the realization that a greenhouse generates its own convection from the roof because the glass heats up, so convective air currents inside have their heat conducted (albeit inefficiently) through the glass, then the warm glass of the roof causes its own convection.
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Now, with a greenhouse in place, we assume the average temperature of the interior rises, and that the glass roof reaches a temperature intermediate between the inside and outside air temperatures: What really changes a lot is the downwelling IR, increasing from the sky value of 350 W/m2 to 450 W/m2, an increase of 100 W/m2.