Radar-based subglacial lake classification in Antarctica

被引：107

作者：

Carter, Sasha P. ^{[1
]}

Blankenship, Donald D. ^{[1
]}

Peters, Matthew E. ^{[1
]}

Young, Duncan A. ^{[1
]}

Holt, John W. ^{[1
]}

Morse, David L. ^{[1
]}

机构：

[1] Univ Texas, Inst Geophys, John A Katherine G Jackson Sch Geosci, Austin, TX 78759 USA

来源：

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS | 2007年 / 8卷

关键词：

subglacial lakes; quaternary geology; radar methods; cryosphere : ice sheets; cryosphere : lakes; cryosphere : instruments and techniques;

D O I：

10.1029/2006GC001408

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

[1] Subglacial lakes in East Antarctica can be separated into four categories specified by radar reflection properties. Definite lakes are brighter than their surroundings by at least 2 dB ( relatively bright) and both are consistently reflective (specular) and have a reflection coefficient greater than - 10 dB ( absolutely bright). Dim lakes are relatively bright and specular but not absolutely bright, indicating nonsteady ice dynamics. Fuzzy lakes are both relatively and absolutely bright, but not specular, and may indicate saturated sediments or "swamps.'' Indistinct lakes are absolutely bright and specular but no brighter than their surroundings. Lakes themselves and the different classes of lakes are not arranged randomly throughout Antarctica but are clustered around ice divides, ice stream onsets, and prominent bedrock troughs, with each cluster demonstrating a different characteristic lake classification distribution. The lake classification algorithm expands on previous studies and demonstrates a novel way to characterize ice-water interactions in East Antarctica.

引用

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