| 多极化冰雷达所揭示的DOME A区域冰盖内部冰晶组构特征 |
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| 引用本文： | 王帮兵,田钢,崔祥斌,张向培.多极化冰雷达所揭示的DOME A区域冰盖内部冰晶组构特征[J].应用地球物理,2008,5(3):230-237. |
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| 作者姓名： | 王帮兵 田钢 崔祥斌 张向培 |
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| 作者单位： | 浙江大学理学院地球科学系，中国极地研究中心 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 摘 要： | The ice exceeding one million years old has significant meaning for verifying and interpreting the middle Pleistocene transition （MPT） and the relationship between greenhouse gas and climate change. The region near Dome A in Antarctica satisfies the conditions for obtaining million-years-old ice since it has low temperatures and low accumulation rates. We analyze the corresponding relation between radar wave features and the crystal orientation fabric （COF） types based on the results of multi-polarization plane radio echo sounding （RES）. The results show that, even in the summit of the ice sheet, the COF type is not perfect, but is an elongated single-pole COF. Principal-axis-orientation differences of the COF among the different periods exist and reveal that the ice flow orientations are not constant but deviate clockwise with the increasing depth. This may be related to the adjacent basal valley or both height and position changes of the summit during the glacial-interglacial periods.
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| 关 键 词： | 南极洲 晶体定向结构 放射回波探通术 冰川流动方位 |
The internal COF features in Dome A of Antarctica revealed by multi-polarization-plane RES |
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| Bangbing Wang,Gang Tian,Xiangbin Cui,Xiangpei Zhang.The internal COF features in Dome A of Antarctica revealed by multi-polarization-plane RES[J].Applied Geophysics,2008,5(3):230-237. |
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| Authors: | Bangbing Wang Gang Tian Xiangbin Cui Xiangpei Zhang |
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| Institution: | (1) Department of Earth Science, Zhejiang University, Hangzhou, 310027, China;(2) Polar Research Institute of China, Shanghai, 210029, China |
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| Abstract: | The ice exceeding one million years old has significant meaning for verifying and interpreting the middle Pleistocene transition(MPT)and the relationship between greenhouse gas and climate change.The region near Dome A in Antarctica satisfies the conditions for obtaining million-years-old ice since it has low temperatures and low accumulation rates.We analyze the corresponding relation between radar wave features and the crystal orientation fabric(COF)types based on the results of multi-polarization plane radio echo sounding(RES). The results show that,even in the summit of the ice sheet,the COF type is not perfect,but is an elongated single-pole COF.Principal-axis-orientation differences of the COF among the different periods exist and reveal that the ice flow orientations are not constant but deviate clockwise with the increasing depth.This may be related to the adjacent basal valley or both height and position changes of the summit during the glacial-interglacial periods. |
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| Keywords: | Crystal orientation fabric(COF) radio echo sounding(RES) multi-polarization plane technique ice flow orientation |
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