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Study on the ice sheet dynamics and its environmental changes of the East Antarctica

东南极冰盖动力学及其环境变化研究

基本信息

批准号：
61302023
负责人：
MAE Shinji
金额：
$ 6.4万
依托单位：
Faculty of Engineering, Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61302023/
关键词：
Antarctica Ice Seet Mizuho Plateau Ice Core Shirase Glacier Basal Sliding Climatic Change アイスレーダー動力学氷厚低下みずほ基地堆積中断

项目摘要

This project was designed as a comprehensive interdisciplinary field and laboratory research effort to systematically investigate the ice sheet dynamics and past climatic changes of the Mizuho Plateau, East Antarctica. Three of the major goals of this project were analysing a 700m deep Mizuho ice core, mapping the thickness and he subsurface topography of the ice sheet and measuring the surface velocity of the ice sheet. The results obtained are as follows.1. Oxygen-18 analyses of the Mizuho ice core reveal that ^<18>o concentration increases with decreasing depth above 150m depth. This fact suggests the lowering of the ice sheets surface.2.The results of microparticle analysis of ice core suggest that there was a big environmental change several thousands years ago.3. The radio echo sounding survey shows that the ice is melting on the bedrock at the large part of the Mizuho Plateau.4. The thinning of ice sheet at the rate of 1 m/a was observed over the down stream area of the Mizuho Plateau by the satellite navigation system.These facts suggest that the Mizuho Plateau, East Antarctica is in unstable condition of catastrophic advance due to basal sliding of ice sheet and the basal sliding of the ice sheet extends to the whole area down stream the Shirase Glacier drainage basin.

该项目旨在作为一个综合性的跨学科领域和实验室研究工作，系统地调查南极洲东部瑞穗高原的冰盖动态和过去的气候变化。该项目的三个主要目标是分析700米深的瑞穗冰芯，绘制冰盖的厚度和地下地形图，并测量冰盖的表面速度。研究结果如下：1.对瑞穗冰芯的氧-18分析表明，<18>在150米以上，冰中氧浓度随深度的减小而增加。冰芯的微粒分析结果表明，几千年前曾发生过一次大的环境变化。无线电回声探测显示，在瑞穗高原的大部分地区，基岩上的冰正在融化。利用卫星导航系统观测到瑞穗高原下游地区冰盖以1 m/a的速率减薄，表明东南极瑞穗高原处于冰盖基底滑动的灾难性前进的不稳定状态，冰盖基底滑动已扩展到白濑冰川流域下游的整个地区。