Study on the mechanisms of Grain boundary diffusion of polar ice

极地冰晶界扩散机制研究

• 批准号: 21340136
• 负责人: AZUMA Nobuhiko
• 金额: $ 11.81万
• 依托单位: Nagaoka University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21340136/
• 关键词: 環境変動; 極地; 超精密計測; 気候変動; 氷床流動; 立相変調ホモダイン干渉計; 氷のクリープ; 粒界拡散; 位相変調ホモダイン干渉計

Grain growth experiments performed using artificial ice and it was found that the activation energy for the grain boundary migration was 110. 120 kJ mol^<-1>, which is twice that for the self-diffusion of ice. An ice creep strain rate measurement system with an uncertainty of order less than 10-10 s-1 and a minimum measurement time of 10 min is developed. The ice specimen of interest is set in a cold cell, with a set-point temperature and maximum stability of-30 to-10℃and±20 mK or less, respectively. A modified phase modulation homodyne interferometer, the supporting material of which is ultralow-thermal-expansion glass, is combined with the system to measure the ice deformation with the resolution of nanometer scale or less.

利用人造冰进行了晶界生长实验，得到晶界迁移的激活能为110。120kJ·mol~(-1)~(-1)，是冰自扩散的两倍。研制了一种最小测量时间为10min、不确定度小于10-10 S-1的冰蠕变应变率测量系统。将感兴趣的冰样放置在冷室中，其设定点温度和最大稳定度分别为-30到-10℃和±20mK或更低。该系统采用改进型相位调制零差干涉仪，以超低热膨胀玻璃为支撑材料，实现了纳米级及以下分辨率的冰形变测量。

项目成果

レーザー干渉測長法による氷の微小変位計測技術の開発IV

激光干涉法冰微位移测量技术开发IV

• 发表时间: 2009
• 作者: 菅原亮太;他7名
• 通讯作者: 他7名

Impeding effect of air bubbles on normal grain growth of ice

气泡对冰晶正常生长的阻碍作用

• 发表时间: 2012
• 期刊: Journal of Structural Geology
• 影响因子: 3.1
• 作者: N. Azuma;et al.
• 通讯作者: et al.

Subgrain boundaries in Antarctic ice quantified by X-ray Laue diffraction

• DOI: 10.3189/002214311795306628
• 发表时间: 2011-03
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: I. Weikusat;A. Miyamoto;S. H. Faria;S. Kipfstuhl;N. Azuma;T. Hondoh