Ice Record of δ13C for Atmospheric CH4 Across the Younger Dryas-Preboreal Transition

  title={Ice Record of $\delta$13C for Atmospheric CH4 Across the Younger Dryas-Preboreal Transition},
  author={Hinrich Schaefer and Michael J. Whiticar and Edward J. Brook and V. V. Petrenko and Dominic Francesco Ferretti and Jeffrey P. Severinghaus},
  pages={1109 - 1112}
We report atmospheric methane carbon isotope ratios (δ13CH4) from the Western Greenland ice margin spanning the Younger Dryas–to–Preboreal (YD-PB) transition. Over the recorded ∼800 years, δ13CH4 was around –46 per mil (‰); that is, ∼1‰ higher than in the modern atmosphere and ∼5.5‰ higher than would be expected from budgets without 13C-rich anthropogenic emissions. This requires higher natural 13C-rich emissions or stronger sink fractionation than conventionally assumed. Constant δ13CH4 during… 

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Methane and nitrous oxide in the ice core record

  • E. WolffR. Spahni
  • Environmental Science, Geography
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2007
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  • T. Sowers
  • Environmental Science, Geography
  • 2006
Analyses of air trapped in the ice from the second Greenland ice sheet project show stable and/or decreasing δDCH4 values during the end of the Younger and Older Dryas periods and one stadial period, suggesting that marine clathrates were stable during these abrupt warming episodes.

Unexpected Changes to the Global Methane Budget over the Past 2000 Years

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