INVESTIGATION OF PALEOCLIMATE AND FLOW HISTORY OF ICE SHEET BY ICE CRYSTAL EVOLUTION MODEL IN ICE SHEET

冰原冰晶演化模型研究冰原古气候和流动史

• 批准号: 13440140
• 负责人: AZUMA Nobuhiko
• 金额: $ 9.47万
• 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: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440140/
• 关键词: ice sheet flow; crystal texture; chemical impurity; grain growth; small angle grain boundary; Antarctic ice sheet; climate change; recrystallization; 固体微粒子; 氷床コア

The objectives of this project are 1) investigation of the behavior of chemical impurities in ice and its interaction with grain boundary migration and the effect of impurities on mechanical properties of ice, and 2) development of the method that can derive the information about paleoclimate and ice sheet flow history from ice core crystal texture and fabric data by using the crystal texture evolution model developed by us. We conducted the grain growth/recrystallization experiments and the mechanical tests with artificial grown ice and obtained following results.1.We established the techniques that produce the ice samples with fine crystal (【approximately equal】100um) and homogeneous distribution of low concentration chemical impurities.2.We obtained the temperature dependence and impurity concentration dependence of grain boundary migration rate of ice.3.In the regime of high impurity concentration more than ppms and high temperature (>-5 degree C) the ice contained impurity become softer than pure ice.4.We found the behaviors of crystal deformation and c-axis rotation when the small angle boundary formation in ice crystals.We will develop our crystal texture evolution model taking account the findings above.

本项目的目标是：1)研究冰中化学杂质的行为及其与晶界迁移的相互作用，以及杂质对冰力学性能的影响；2)利用我们开发的晶体结构演化模型，开发从冰芯晶体结构和织物数据中获取古气候和冰盖流动历史信息的方法。我们进行了晶粒生长/再结晶实验和人工生长冰的力学试验，得到了以下结果：建立了细晶（约等于100微米）、低浓度化学杂质均匀分布的冰样制备技术。得到了冰晶界迁移速率的温度依赖关系和杂质浓度依赖关系。在超过ppms的高杂质浓度和高温（>-5℃）条件下，含杂质的冰比纯冰更软。我们发现了冰晶小角度边界形成时晶体变形和c轴旋转的行为。考虑到上述发现，我们将开发我们的晶体结构演化模型。

项目成果

船木一人: "固体微粒子を含んだ氷の変形中の結晶組織変化と流動特性"日本雪氷学会講演予稿集(2001). 140 (2001)

Hitoshi Funaki：“含有固体颗粒的冰变形过程中的晶体结构变化和流动特性”日本冰雪学会会议记录（2001）140（2001）。

Ice fabrics study in the upper 1500 m of the Dome C deep ice core, East Antarctica

东南极洲 Dome C 深冰芯上部 1500 米的冰结构研究

• 发表时间: 2003
• 期刊: Annals of Glaciology 37
• 作者: L.A.Wilen;Y.Wang
• 通讯作者: Y.Wang

T.Hondoh: "Physical properties of the Dome Fuji deep ice core"Mem.National Institute of Polar research, Special Issue. 57. 63-71 (2003)

T.Hondoh：“富士圆顶深冰芯的物理特性”Mem.国立极地研究所，特刊。

Physical properties of the Dome Fuji deep ice core

富士圆顶深层冰芯的物理特性

• 发表时间: 2003
• 期刊: Memoirs of National Institute of Polar Research, Special Issue 57
• 作者: Hondoh;T.
• 通讯作者: T.

Fujita, S.: "Electrical measurements on the 2503-m Dome F Antarctic ice core"Annals of Glaciology. Vol.35. 313-320 (2002)

Fujita, S.：“2503 米 Dome F 南极冰芯的电测量”冰川学年鉴。