Preliminary results of the close-off depth and the stable isotopic records along a 109.91 m ice core from Dome A, Antarctica

查看全文 作　　者：HOU [1]ShuGui;LI [2]YuanSheng;XIAO [1]CunDe;PANG [3]HongXi;XU [1]JianZhong

机构地区：[1]State Key Laboratory of Cryospheric Sciences,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;[2]Polar Research Institute of China,Shanghai 200129,China;[3]State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China

出　　处：《Science China Earth Sciences》索引2009年第52卷第10期,共8页

基　　金：Supported by National Natural Science Foundation of China (Grant Nos. 40825017 and 40576001);One Hundred Talents Program of Chinese Academy of Sciences, Knowledge Innovation Project of the Chinese Academy of Sciences (Grant No. KZCX3-SW- 354);National Key Technology R & D Program (Grant No. 2006BAB18B01);and the Programme International de Cooperation Scientifique (PICS) Project 'Climate and Environment in Antarctica and the Himalayas' (CLEAH, PICS no3499) 摘　　要：A 109.91 m ice core was recovered from Dome A (or Dome Argus), the highest ice feature in Antarctica, during the 2004/05 austral summer by the 21st Chinese National Antarctic Research Expedition (CHINARE-21). Both methane profile along the core and firn densification model calculation suggest that the close-off depth is at about 102.0 m with an ice age about 4200 a. Stable isotopes (δ18O and δD) of the chips samples produced during each run of ice core drilling at Dome A, together with those of the other cores recovered from the eastern inland Antarctica, suggest a relative stable climate with a temperature fluctuation amplitude about ±0.6℃ at the eastern inland Antarctica during the late Holocene. The average d-excess (or d =δ D-8δ 18O) of 17.1‰ along the Dome A core is probably the highest among the Antarctic inland ice cores, which may be resulted from the kinetic fractionation during the snow formation under an oversaturation condition. Moreover, the increasing trend of d-excess during the late Holocene reflects mainly the migration of the water source area for precipitation at Dome A towards low latitudes. This paper presents the first results of a shallow ice core recovered from the unexplored highest area of the Antarctic ice sheet, providing a background for the proposing deep ice core drilling at Dome A. 关键词：ANTARCTICA Dome A ice core close-off DEPTH STABLE isotopes

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Preliminary results of the close-off depth and the stable isotopic records along a 109.91 m ice core from Dome A, Antarctica

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