Evidence for an early Holocene climatic optimum in the Antarctic deep ice-core record |
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| Authors: | P Ciais J R Petit J Jouzel C Lorius N I Barkov V Lipenkov V Nicolaïev |
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| Institution: | (1) Laboratoire de Géochimie Isotopique, CEA/CEN Saclay, DSM, F-91 191 Gif sur Yvette cedex, France;(2) Laboratoire de Glaciologie et de Géophysique de l'Environnement, BP 96, F-38402 Saint Martin d'Hères cedex, France;(3) Arctic and Antarctic Research Institute, Beringa Street 38, 199226 Leningrad, Russia;(4) Institute of Geography, Academy of Science of the USSR, Staromonetny 29, 109107 Moscow, Russia |
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| Abstract: | In the interpretation of the Antarctic deep ice-core data, little attention has been given to the Holocene part of the records. As far as translation of the stable isotope content in terms of temperature is concerned, this can be understood because expected temperature changes may be obscured by isotopic noise of various origins and because no 14C dating has yet been available for this type of sequence. In this article, we focus on the Dome C and Vostok cores and on a new 850-m long ice core drilled out at Komsomolskaïa by the Soviet Antarctic Expeditions. These three sites are located in East Antarctica, on the Antarctic plateau, in a region essentially undisturbed by ice-flow conditions, so that their detailed intercomparison may allow us to identify the climatically significant isotopic signal. Our results compare well with the proximal records of Southern Hemisphere high latitudes and support the existence of a warmer  climatic optimum between 10 and 6 ka y BP. Maximum temperatures are reached just at the end of the last deglaciation, which confirms previous observations at high latitudes, in contrast with later dates for the Atlantic and hypsithermal optima in Europe and North America.Contribution to Clima Locarno — Past and Present Climate Dynamics; Conference September 1990, Swiss Academy of Sciences — National Climate Program |
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