Friday, 13 January 2017

thermal radiation - Why is methane considered an important greenhouse gas?


Methane’s absorption bands are centered at 3.2 and 7.2 microns -- far off the peak of the Planck spectrum for a 290 K blackbody near 16 microns. Moreover, its absorption bands overlap with the water absorption region. So why is methane considered a stronger greenhouse gas than carbon dioxide, which has an absorption band at 15 microns?




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