Nature 329, 408 - 414 (01 October 1987); doi:10.1038/329408a0

Vostok ice core provides 160,000-year record of atmospheric CO₂

J. M. Barnola^*, D. Raynaud^*, Y. S. Korotkevich^† & C. Lorius^*

^* Laboratoire de Glaciologie et de Géophysique de 1'Environnement, BP 96, 38402 Saint Martin d'Hères Cedex, France
^† Arctic and Antarctic Research Institute, Beringa Street 38, Leningrad 199226, USSR

Direct evidence of past atmospheric CO² changes has been extended to the past 160,000 years from the Vostok ice core. These changes are most notably an inherent phenomenon of change between glacial and interglacial periods. Besides this major 100,000-year cycle, the CO² record seems to exhibit a cyclic change with a period of some 21,000 years.

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