Automated detection and characterization of Antarctic basal units using radar sounding data: demonstration in Institute Ice Stream, West Antarctica
Automated detection and characterization of Antarctic basal units using radar sounding data: demonstration in Institute Ice Stream, West Antarctica
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使用雷达探测数据自动检测和表征南极基本单元：在南极洲西部冰流研究所进行演示
DOI：
10.1017/aog.2020.27
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发表时间：
2020
影响因子：
2.9
通讯作者：
Goldberg M
中科院分区：
文献类型：
--
作者：
Goldberg M
基底单元——在冰床界面附近明显的明显的冰川结构——有许多理由值得研究。许多岩石的成分和起源都是未知的，这些特征可以为了解冰下过程和冰盖历史提供实质性的线索。此外，它们的意义不仅限于近地层深度；这些单元似乎极大地影响了周围冰的流动。为了改进这些特征的表征，我们开发并应用了一种允许自动检测基础单位的算法。我们使用可调的分层优化SAR处理器将这些结构与床层、等时冰层和冰盖表面区分开来，提出了在识别冰盖特征中使用无线电回波特征的概念框架。我们还概述了一种方法，通过这种方法，我们的处理器可以用来对基本单元的配置、组成和来源进行观测约束。
Basal units – visibly distinct englacial structures near the ice-bed interface – warrant investigation for a number of reasons. Many are of unknown composition and origin, characteristics that could provide substantial insight into subglacial processes and ice-sheet history. Their significance, moreover, is not limited to near-bed depths; these units appear to dramatically influence the flow of surrounding ice. In order to enable improved characterization of these features, we develop and apply an algorithm that allows for the automatic detection of basal units. We use a tunable layer-optimized SAR processor to distinguish these structures from the bed, isochronous englacial layers and the ice-sheet surface, presenting a conceptual framework for the use of radio-echo character in the identification of ice-sheet features. We also outline a method by which our processor could be used to place observational constraints on basal units’ configuration, composition and provenance.