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Atmospheric methane during the last four glacial-interglacial cycles: Rapid changes and their link with Antarctic temperature

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Abstract
  • Atmospheric methane (CH₄) recorded in Antarctic ice cores represents the closest ice proxy available for Greenland temperature changes beyond times when Greenland climate records are available. The record over four climatic cycles from the Vostok ice core offers the opportunity to study the phase relationship between Greenland and Antarctic climate changes through detailed CH₄ profiles. Combining American and French analytical efforts, we have improved the time resolution of the existing CH₄ record from Petit et al. [1999] . Spectral analyses reveal high- and low-frequency variability (including a strong precessional component). The phase relationship between CH₄ and the Antarctic temperature proxy (δD) shows a systematic lag of CH₄ versus temperature by 1100 ± 200 years, on long timescales (50–400 kyr) and a more complex behavior over shorter timescales (i.e., ≤25 kyr), suggesting that Dansgaard/Oeschger-type of climatic variability and associated interhemispheric linkage are robust features of late Quaternary climate.
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  • Delmotte, M., J. Chappellaz, E. Brook, P. Yiou, J. M. Barnola, C. Goujon, D. Raynaud, and V. I. Lipenkov (2004), Atmospheric methane during the last four glacial-interglacial cycles: Rapid changes and their link with Antarctic temperature, Journal of Geophysical Research, 109, D12104, doi:10.1029/2003JD004417.
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  • 109
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  • D12104
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  • We thank ice drillers and all participants in the fieldwork and ice sampling, the Russian Antarctic Expeditions (RAE), the Institut Francais Paul Emile Victor (IPEV) and the Office of Polar Programs (NSF) for logistic support. This work is a contribution to the EC project Pole-Ocean-Pole (EVK2-2000-22067).Additional financial support in France was provided by the Programme National d'Etudes de la Dynamique du Climat (INSU-CNRS). The US National Science Foundation, Office of Polar Programs, provided financial support for the WSU portion of the project.
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