气候变化领域集成服务门户(CCPortal): Multidecadal observations of the Antarctic ice sheet from restored analog radar records

CCPortal

DOI	10.1073/pnas.1821646116
	Multidecadal observations of the Antarctic ice sheet from restored analog radar records
	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.
发表日期	2019
ISSN	0027-8424
起始页码	18867
结束页码	18873
卷号	116 期号:38
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.
英文关键词	Antarctica; Archival data; Glaciology; Radio echo sounding; Remote sensing
语种	英语
scopus关键词	Antarctica; article; glacier; ice sheet; ice shelf; information center; remote sensing; telecommunication
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158861
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, Stanfo...
推荐引用方式 GB/T 7714	Schroeder D.M.,Dowdeswell J.A.,Siegert M.J.,et al. Multidecadal observations of the Antarctic ice sheet from restored analog radar records[J],2019,116(38).
APA	Schroeder D.M..,Dowdeswell J.A..,Siegert M.J..,Bingham R.G..,Chu W..,...&Winstein K..(2019).Multidecadal observations of the Antarctic ice sheet from restored analog radar records.Proceedings of the National Academy of Sciences of the United States of America,116(38).
MLA	Schroeder D.M.,et al."Multidecadal observations of the Antarctic ice sheet from restored analog radar records".Proceedings of the National Academy of Sciences of the United States of America 116.38(2019).