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

@article{Schaefer2006IceRO,
  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},
  journal={Science},
  year={2006},
  volume={313},
  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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