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Using the deuterium isotope composition of permafrost meltwater to constrain thermokarst lake contributions to atmospheric CH4 during the last deglaciation

Dates

Year
2012

Citation

Brosius, L. S., Walter Anthony, K. M., Grosse, G., Chanton, J. P., Farquharson, L. M., Overduin, P. P., and Meyer, H., 2012, Using the deuterium isotope composition of permafrost meltwater to constrain thermokarst lake contributions to atmospheric CH4 during the last deglaciation: Journal of Geophysical Research.Biogeosciences, v. 117, no. 1, n/a p.

Summary

Thermokarst lakes are thought to have been an important source of methane (CH4) during the last deglaciation when atmospheric CH4 concentrations increased rapidly. Here we demonstrate that meltwater from permafrost ice serves as an H source to CH4 production in thermokarst lakes, allowing for region-specific reconstructions of ?DCH4 emissions from Siberian and North American lakes. ?DCH4 reflects regionally varying ?D values of precipitation incorporated into ground ice at the time of its formation. Late Pleistocene-aged permafrost ground ice was the dominant H source to CH4 production in primary thermokarst lakes, whereas Holocene-aged permafrost ground ice contributed H to CH4 production in later generation lakes. We found that Alaskan [...]

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Type Scheme Key
DOI http://sciencebase.gov/vocab/identifierScheme 10.1029/2011JG001810
ISSN http://sciencebase.gov/vocab/identifierScheme 21698953

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