Study on the dynamics of the englacial and subglacial environment of the ice sheet in East Antarctica using ice sounding radars

利用冰探雷达研究南极洲东部冰盖冰上和冰下环境动力学

• 批准号: 16310016
• 负责人: FUJITA Shuji
• 金额: $ 5.12万
• 依托单位: National Institute of Polar Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16310016/
• 关键词: Antarctica; ice sheet; radar; ice core; remote sensing; Dome Fuji; wave propagation; birefringence

We analyzed data from deep radar sounding of the Antarctic ice sheet. By analysis of the radar data, we first investigated wave propagation in wide area in Antarctica. Subsequently, we studied effects from crystal orientation fabrics, dynamical condition of the ice sheet, bottom environment and impurity. Outline of the result is as follows.1.In the first fiscal year, we made numerical experiments using a wave propagation model.2.We compared the simulated results with the observational data.3.We assessed internal structure of the Antarctic ice sheet. We put special emphasis on the following points.(1)I identified and analyzed distribution of the isochrones (constant time horizon).(2)We investigated three dimensional distribution of the wave scattering mechanisms within the ice sheet.(3)We identified echo free zone within the Antarctic ice sheet.4,We made a computer program to archive old data of ice radar. Old data is recorded as video image, which we needed to digitize as numerical data.Overall, we made better archiving the old data and studied in detail potential of the ice radar data for the ice dynamics study in Antarctica.

我们分析了南极冰盖深度雷达探测的数据。通过对雷达数据的分析，我们首先调查了南极洲大范围的波传播情况。随后，我们研究了晶体取向结构、冰盖动力学条件、底部环境和杂质的影响。结果概要如下：1.在第一财年，我们利用波浪传播模型进行了数值实验。2.我们将模拟结果与观测数据进行了比较。3.我们评估了南极冰盖的内部结构。我们特别强调了以下几点。（1）识别并分析了等时线（恒定时间范围）的分布。（2）研究了冰盖内波散射机制的三维分布。（3）识别了回波南极冰盖内的自由区。4，我们编写了一个计算机程序来存档冰雷达的旧数据。旧数据被记录为视频图像，我们需要将其数字化为数值数据。总的来说，我们更好地归档了旧数据，并详细研究了冰雷达数据在南极洲冰动力学研究中的潜力。

项目成果

1-D-ice flow modelling at EPICA Dome C and Dome Fuji, East Antarctica

南极洲东部 EPICA Dome C 和 Dome Fuji 的一维冰流建模

• 发表时间: 2007
• 期刊: C and Dome Fuji, East Antarctica 3(2)
• 作者: Parrenin;F
• 通讯作者: F

Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area using flow modeling and compositional matching to deep ice cores

• DOI: 10.1029/2005jd006343
• 发表时间: 2006-08
• 期刊: Journal of Geophysical Research
• 作者: J. Moore;F. Nishio;S. Fujita;H. Narita;E. C. Pasteur;A. Grinsted;A. Sinisalo;N. Maeno