极地研究

极地研究 ›› 2022, Vol. 34 ›› Issue (4): 401-418.DOI: 10.13679/j.jdyj.20210085

• 研究综述 • 上一篇    下一篇

利用冰床粗糙度研究南极冰下环境和过程综述

李雁君1,2 崔祥斌2 乔刚1 稂时楠3   

  1. 1同济大学测绘与地理信息学院, 上海 200092;
    2中国极地研究中心, 上海 200136;
    3北京工业大学信息学部, 北京100124
  • 出版日期:2022-12-31 发布日期:2023-01-11
  • 通讯作者: 崔祥斌
  • 作者简介:李雁君, 女, 1995生。博士研究生, 主要从事南极冰盖冰流速提取与冰盖/冰架不稳定性分析研究。E-mail: 1710992@tongji.edu.cn
  • 基金资助:
    国家自然科学基金(41730102, 41776186, 41771471);上海市科技计划项目(21ZR1469700)资助

Subglacial conditions and processes of the Antarctic ice sheet based on bedrock roughness: A review

Li Yanjun1,2, Cui Xiangbin2, Qiao Gang1, Lang Shinan3   

  1. 1College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China;
    2Polar Research Institute of China, Shanghai 200136, China;
    3Faculy of Information Technology, Beijing University of Technology, Beijing 100124, China
  • Online:2022-12-31 Published:2023-01-11

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摘要： 冰下地形是冰盖运动和冰底侵蚀过程作用于冰前地形的结果。冰床粗糙度是对冰下地形不规则程度的定量刻画, 是反映冰下环境和过程的重要指标, 可用于研究冰下基岩物质组成、冰下侵蚀过程和冰底滑动状况、冰下地貌形成演化以及冰流运动等。首先, 对冰床粗糙度量化方法的发展进行了介绍, 详述了基于冰雷达数据的沿轨迹地形统计特性和基于冰床回波波形电磁散射特性这两类刻画冰床粗糙度的方法的演变和进展; 其次, 通过分析冰床粗糙度与冰动力学、冰下地貌、冰盖底部热机制、冰下地质等的联系, 归纳了利用冰床粗糙度研究南极冰盖冰下环境和过程的相关进展; 最后, 对利用冰床粗糙度研究南极冰盖冰下环境和过程的现状及其未来发展趋势进行了总结和展望。

关键词: 冰床粗糙度, 南极冰盖, 冰下地形, 冰下环境, 冰动力学

Abstract: Subglacial topography is an important indicator that both reflects and itself influences subglacial conditions and processes of the Antarctic ice sheet. Ice sheet dynamics and basal erosional processes erode pre-glacial topography. As such, bedrock roughness metrics can act as indicators of subglacial conditions and processes (including spatial variability thereof). More specifically, bedrock roughness data can help deduce the material composition of the bedrock, the conditions of sub-glacial erosion and basal sliding, ice dynamics, and subglacial geomorphology. In this study, the potential utility of bedrock roughness characterization and the development of associated quantitative methods are introduced. We focus on the evolution of two methods, one is based on the statistical characteristics of the topography-derived (topographic) roughness and the other is the scattering-derived roughness. Then, relevant studies on subglacial conditions and ice sheet evolution using bedrock roughness were reviewed by evaluating the relationship between bedrock roughness and ice dynamics, subglacial geomorphology, basal thermal mechanism, subglacial geology, and so forth. Finally, the current situation and future potential developments around the study subglacial conditions and processes using bedrock roughness are considered.

Key words: bed roughness, Antarctic ice sheet, subglacial topography, subglacial conditions, ice dynamics