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Schaefer, Hinrich; Whiticar, Michael J.; Brook, Edward J.; Petrenko, Vasilii V.; Ferretti, Dominic F.; Severinghaus, Jeffrey P.

Ice Record of δ 13 C for Atmospheric CH 4 Across the Younger Dryas-Preboreal Transition

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  • Medientyp: E-Artikel
  • Titel: Ice Record of δ 13 C for Atmospheric CH 4 Across the Younger Dryas-Preboreal Transition
  • Beteiligte: Schaefer, Hinrich; Whiticar, Michael J.; Brook, Edward J.; Petrenko, Vasilii V.; Ferretti, Dominic F.; Severinghaus, Jeffrey P.
  • Erschienen: American Association for the Advancement of Science (AAAS), 2006
  • Erschienen in: Science, 313 (2006) 5790, Seite 1109-1112
  • Sprache: Englisch
  • DOI: 10.1126/science.1126562
  • ISSN: 0036-8075; 1095-9203
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:p> We report atmospheric methane carbon isotope ratios (δ <jats:sup>13</jats:sup> CH <jats:sub>4</jats:sub> ) from the Western Greenland ice margin spanning the Younger Dryas–to–Preboreal (YD-PB) transition. Over the recorded ∼800 years, δ <jats:sup>13</jats:sup> CH <jats:sub>4</jats:sub> 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 <jats:sup>13</jats:sup> C-rich anthropogenic emissions. This requires higher natural <jats:sup>13</jats:sup> C-rich emissions or stronger sink fractionation than conventionally assumed. Constant δ <jats:sup>13</jats:sup> CH <jats:sub>4</jats:sub> during the rise in methane concentration at the YD-PB transition is consistent with additional emissions from tropical wetlands, or aerobic plant CH <jats:sub>4</jats:sub> production, or with a multisource scenario. A marine clathrate source is unlikely. </jats:p>