Methane - The record in polar ice cores

Details Methane - The record in polar ice cores Methane - The record in polar ice cores

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9.1221c&link_type=abstract

Geophysical Research Letters, vol. 9, Nov. 1982, p. 1221-1224. NSF-sponsored research.

Physics

71

Atmospheric Composition, Core Sampling, Land Ice, Methane, Climatology, Geochemistry, Long Term Effects, Mixing

Scientific paper

The results of examination of gas samples extracted from the Dye 3 Greenland ice core have demonstrated that atmospheric CH4 concentrations were much lower than at present 30,000 yr ago, and that a 50% increase in the atmospheric CH4 concentration has occurred during the 15-19th centuries. Gas chromatographic techniques were employed to examine the samples, which were studied at 16 depths of 26-57 cm long cores. Specimens taken from ice deposited 27,000 yr B.P. were found to be in agreement with previous samples from Antarctic ice. The concentration was 0.70 ppmv from the late Wisconsin era to about 1580 A.D. A linear increase ensued to the present day value of 1.60 ppmv. It is calculated that the CH4 increase has contributed 38% of the atmospheric greenhouse effect attributed to CO2.

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