期刊
JOURNAL OF GLACIOLOGY
卷 56, 期 199, 页码 831-836出版社
CAMBRIDGE UNIV PRESS
DOI: 10.3189/002214310794457326
关键词
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资金
- National Science Foundation of China (NSFC) [40906100, 40476005]
- National High Technology Research and Development Program of China [2008AA121702]
- Polar Science Strategy Research Foundation of China [20080204]
- China Postdoctoral Science Foundation (CPSF) [20090450085]
- National Basic Research Program of China (973 Program) [2010CB950301]
- UK Natural Environment Research Council [NE/D003733/1]
Previous studies using Fourier transformation (FT) methods to analyze subglacial roughness have shown promise for distinguishing between different types of subglacial landscape from raw subglacial elevation data. We derive a two-parameter FT roughness index {xi, eta}, where xi is based on the FT of elevation (as previously considered in isolation), and eta is based on both the FT of elevation and the FT of bed-slope profile. In this way, we take account of both vertical and horizontal irregularities in subglacial surfaces. We demonstrate the statistical veracity of using {xi, eta} to consider roughness in terms of obstacle amplitudes and spacing, and consider the use of {xi, eta} in studies of ice dynamics and subglacial geomorphological interpretation. We show that {xi, eta} can be linked to basal sliding rates on the metre scale, and can be used to differentiate further than single-parameter roughness indices between different classes of subglacial landscape, in particular between erosional and depositional settings.
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