Unexpected changes to the global methane budget over the past 2000 years.

  title={Unexpected changes to the global methane budget over the past 2000 years.},
  author={Dominic F Ferretti and John Bharat Miller and James W. C. White and David M. Etheridge and Keith R. Lassey and Dave C. Lowe and C M Macfarling Meure and Mas Dreier and Cathy M. Trudinger and Tas D van Ommen and Ray L. Langenfelds},
  volume={309 5741},
We report a 2000-year Antarctic ice-core record of stable carbon isotope measurements in atmospheric methane (delta13CH4). Large delta13CH4 variations indicate that the methane budget varied unexpectedly during the late preindustrial Holocene (circa 0 to 1700 A.D.). During the first thousand years (0 to 1000 A.D.), delta13CH4 was at least 2 per mil enriched compared to expected values, and during the following 700 years, an about 2 per mil depletion occurred. Our modeled methane source… CONTINUE READING

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