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The changes in isotope composition and accumulation of snow at Vostok station, East Antarctica, over the past 200 years

  • Alexei A. Ekaykin (a1), Vladimir Ya. Lipenkov (a1), Irina N. Kuzmina (a1), Jean Robert Petit (a2), Valérie MASSON-Delmotte (a3) and Sigfus J. Johnsen (a4)...
Abstract
Abstract

High-resolution records of isotope composition (δD) and accumulation of snow have been obtained from 10–12m deep snow pits dug in the vicinity of Vostok station during the 1979/80 and 1999/2000 Antarctic field seasons. We employ meteorological, balloon-sounding and snow-stake data to interpret the isotope record in terms of past temperature changes. Our reconstruction suggests that snow accumulation rate and the near-surface air temperature at Vostok have varied during the past 200 years between 15 and 30 kg m–2 a–1, and between –56 and –55˚C, respectively, with a slight general tendency to increase from the past to the present. Both parameters reveal a 50 year periodicity that correlates with the Pacific Decadal Oscillation index, implying a climatic teleconnection between central Antarctica and the tropical Pacific.

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References
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Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
  • URL: /core/journals/annals-of-glaciology
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