globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1821646116
论文题名:
Multidecadal observations of the Antarctic ice sheet from restored analog radar records
作者: Schroeder D.M.; Dowdeswell J.A.; Siegert M.J.; Bingham R.G.; Chu W.; MacKie E.J.; Siegfried M.R.; Vega K.I.; Emmons J.R.; Winstein K.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:38
起始页码: 18867
结束页码: 18873
语种: 英语
英文关键词: Antarctica ; Archival data ; Glaciology ; Radio echo sounding ; Remote sensing
Scopus关键词: Antarctica ; article ; glacier ; ice sheet ; ice shelf ; information center ; remote sensing ; telecommunication
英文摘要: Airborne radar sounding can measure conditions within and beneath polar ice sheets. In Antarctica, most digital radar-sounding data have been collected in the last 2 decades, limiting our ability to understand processes that govern longer-term ice-sheet behavior. Here, we demonstrate how analog radar data collected over 40 y ago in Antarctica can be combined with modern records to quantify multidecadal changes. Specifically, we digitize over 400,000 line kilometers of exploratory Antarctic radar data originally recorded on 35-mm optical film between 1971 and 1979. We leverage the increased geometric and radiometric resolution of our digitization process to show how these data can be used to identify and investigate hydrologic, geologic, and topographic features beneath and within the ice sheet. To highlight their scientific potential, we compare the digitized data with contemporary radar measurements to reveal that the remnant eastern ice shelf of Thwaites Glacier in West Antarctica had thinned between 10 and 33% between 1978 and 2009. We also release the collection of scanned radargrams in their entirety in a persistent public archive along with updated geolocation data for a subset of the data that reduces the mean positioning error from 5 to 2.5 km. Together, these data represent a unique and renewed extensive, multidecadal historical baseline, critical for observing and modeling ice-sheet change on societally relevant timescales. © 2019 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163534
Appears in Collections:气候变化与战略

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作者单位: Schroeder, D.M., Department of Geophysics, Stanford University, Stanford, CA 94305, United States, Department of Electrical Engineering, Stanford University, Stanford, CA 94305, United States; Dowdeswell, J.A., Scott Polar Research Institute, University of Cambridge, Cambridge, CB2 1ER, United Kingdom; Siegert, M.J., Grantham Institute, Imperial College London, London, SW7 2AZ, United Kingdom; Bingham, R.G., School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, United Kingdom; Chu, W., Department of Geophysics, Stanford University, Stanford, CA 94305, United States; MacKie, E.J., Department of Geophysics, Stanford University, Stanford, CA 94305, United States; Siegfried, M.R., Department of Geophysics, Stanford University, Stanford, CA 94305, United States, Department of Geophysics, Colorado School of Mines, Golden, CO 80401, United States; Vega, K.I., Department of Geophysics, Stanford University, Stanford, CA 94305, United States; Emmons, J.R., Department of Computer Science, Stanford University, Stanford, CA 94305, United States; Winstein, K., Department of Electrical Engineering, Stanford University, Stanford, CA 94305, United States, Department of Computer Science, Stanford University, Stanford, CA 94305, United States

Recommended Citation:
Schroeder D.M.,Dowdeswell J.A.,Siegert M.J.,et al. Multidecadal observations of the Antarctic ice sheet from restored analog radar records[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(38)
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