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

Alexei Ekaykin , Vladimir Ya. Lipenkov , Irina Kuzmina , Jean Robert Petit , Valérie Masson-Delmotte (1, 2) , Sigfus Johnsen

1 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
2 GLACCIOS - Glaces et Continents, Climats et Isotopes Stables

High-resolution records of isotope composition (dD) and accumulation of snow have been obtained from 10-12 m 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-558C, 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.

Domaines: Océan, Atmosphère; Interfaces continentales, environnement

Alexei Ekaykin, Vladimir Ya. Lipenkov, Irina Kuzmina, Jean Robert Petit, Valérie Masson-Delmotte, et al.. The changes in isotope composition and accumulation of snow at Vostok station, East Antarctica, over the past 200 years. Annals of Glaciology, 2004, 39, pp.569-575. ⟨10.3189/172756404781814348⟩. ⟨hal-03102768⟩