Surface characteristics at Dome A, Antarctica: first measurements and a guide to future ice-coring sites
Surface characteristics at Dome A, Antarctica: first measurements and a guide to future ice-coring sites
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DOI：
10.3189/172756408784700653
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发表时间：
2008
影响因子：
2.9
通讯作者：
Xiao Cunde;Yuansheng Li;I. Allison;Shugui Hou;G. Dreyfus;J. Barnola;J. Ren;Lingen Bian;
中科院分区：
文献类型：
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作者：
Xiao Cunde;Yuansheng Li;I. Allison;Shugui Hou;G. Dreyfus;J. Barnola;J. Ren;Lingen Bian;
摘要根据2004/05年南极夏季的实地考察，对东南极冰盖之巅Dome A的冰川学和气象学特征进行了评估。了解这些特征对于未来的国际研究，如深冰芯钻探至关重要。评估表明：（1）冰穹A的特点是10米深处的积雪温度非常低，为-58.3摄氏度（比EPICA冰穹C低近3摄氏度，比东方冰穹低1摄氏度）。(2)自动气象站（AWS）对雪坑中雪面高度和参考层的测量表明，Dome A的现今积雪速率在1-3cmw.e之间。a-1.压实模型建议的范围为1-2cmw.e。a-1.这低于东南极洲冰分水岭（IDEA）沿着的其他地点。因此，冰穹A的年层可能比其他地点薄，因此在给定的冰厚度下保存了更长的记录。(3)在Dome A观测到的平均风速（<4 ms-1）低于IDEA沿着的其他站点。总之，这些参数，结合无线电回波探测数据和冰下排水分布的信息，冰穹A下，建议冰穹A作为一个候选网站，以获得最古老的冰芯。
Abstract An assessment of the glaciological and meteorological characteristics of Dome A, the summit of the East Antarctic ice sheet, is made based on field investigations during the austral summer of 2004/05. Knowledge of these characteristics is critical for future international studies such as deep ice-core drilling. The assessment shows that: (1) Dome A is characterized by a very low 10m depth firn temperature, –58.3˚C (nearly 3˚C lower than at EPICA Dome C and 1˚C lower than at Vostok). (2) Automatic weather station (AWS) measurements of snow surface height and reference layers in a snow pit indicate the present-day snow accumulation rate at Dome A is within the range 1–3cmw.e. a–1. Densification models suggest a range of 1–2cmw.e. a–1. This is lower than at other sites along the ice divide of East Antarctica (IDEA). Annual layers at Dome A are thus potentially thinner than at other sites, so that a longer record is preserved in a given ice thickness. (3) The average wind speed observed at Dome A (<4ms–1) is lower than at other sites along IDEA. Together, these parameters, combined with radio-echo sounding data and information on the subglacial drainage distribution beneath Dome A, suggest Dome A as a candidate site for obtaining the oldest ice core.