2009年02月26日

Arctic methane revisited

A late-autum 'shoulder' is a regular fuature of the seasonal cycles of atomospheric methane at high latitudes, but the soureces of this burst of methane remain obscure. Mastepanov et al.

now report metthane flux measurements from a high Arctic setting during the onset of soilfeezing. The total emissions during this freezein period are roughly equal to the amount of methane emitted during the entire summer season. Including the observed methane burst in an atomospheric chemistry and transport model inproves agreement between the simulated seasonal cycle and atmospheric data from latitudes noeth of 60°N.

These results suggest that permafrost-associated freeze-in bursts of methane from tundra regoins may be an important previously unrecognized component of the seasonal distribution of methane emissions at high latitudes.

### DataBace ###
nature Vol.456 545-674 Issue no.7222 4 December 2008
Letters p.628 / Large tundra methane burst durring onset of freezing / M Mastepanov et al. (Lund University:Sweden)

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