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Atmospheric Methane over the Arctic Ocean: Satellite Data

Sonar image of methane plumes rising from the Arctic Ocean floor (Image: National Oceanography Centre, Southampton) “Burning ice” Methane is 20-25 times stronger (per molecule) absorber of IR radiation than CO2: bands of CH4 are less saturated than those of CO2. Arctic atmosphere and ocean are warming now. Methane emission from natural sources (wetlands, permafrost, methane hydrates) is expected to increase with temperature, that makes the positive feed-back (self-supporting growth) possible. The amount of methane in the Arctic hydrates alone is estimated as 400 times more than the global atmospheric CH4 burden! The question is timescale of the methane liberation: gradual, abrupt, or something in between. Satellite monitoring of methane over the Arctic Ocean is necessary. Motivation, Background, Goal.