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How does sun heat the air?
On Oct 9, 10:47*am, Tim Taylor wrote:
Evan, While the long wave does have a greater input back into the total atmosphere and to radiation back into space I think in the boundary layer conduction and convection are still the primary sources of heat transfer. * *Since the air is primarily oxygen and nitrogen that are both opaque to long waves as well it it mostly the other sources that generate thermals. Hey Tim, I think you'll find if you dig into this that it's long wave radiation, plus convection (thermals + wind) and evaporation/ condensation. Conduction is a bit player. See second two answers here, though I cannot vouch for numbers http://www.newton.dep.anl.gov/askasc...0/wea00082.htm -- the first response given is in error. There must be something better on the web, but I can't find it quickly. What's missing here is useful info on absorption coefficients and heat flux vs wavelength and water vapor content. But what I am given to understand here is that most of the heat energy that drives thermals we can use comes from long wave infrared transmitted from the heated surface and absorbed in the first few feet / tens of feet / hundreds of feet. I cheerfully admit I don't have the time to go get the details to back up my case Best, Evan Ludeman / T8 |
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