globalchange  > 气候变化事实与影响
Scopus记录号: 2-s2.0-85062504618
论文题名:
Sentinel-3 Delay-Doppler altimetry over Antarctica
作者: McMillan M.; Muir A.; Shepherd A.; Escolà R.; Roca M.; Aublanc J.; Thibaut P.; Restano M.; Ambrozio A.; Benveniste J.
刊名: Cryosphere
ISSN: 19940416
出版年: 2019
卷: 13, 期:2
起始页码: 709
结束页码: 722
语种: 英语
英文摘要: The launch of Sentinel-3A in February 2016 represented the beginning of a new long-term series of operational satellite radar altimeters, which will provide Delay-Doppler altimetry measurements over ice sheets for decades to come. Given the potential benefits that these satellites can offer to a range of glaciological applications, it is important to establish their capacity to monitor ice sheet elevation and elevation change. Here, we present the first analysis of Sentinel-3 Delay-Doppler altimetry over the Antarctic ice sheet, and assess the accuracy and precision of retrievals of ice sheet elevation across a range of topographic regimes. Over the low-slope regions of the ice sheet interior, we find that the instrument achieves both an accuracy and a precision of the order of 10:cm, with ĝ1/498:% of the data validated being within 50:cm of co-located airborne measurements. Across the steeper and more complex topography of the ice sheet margin, the accuracy decreases, although analysis at two coastal sites with densely surveyed airborne campaigns shows that ĝ1/460:%-85:% of validated data are still within 1:m of co-located airborne elevation measurements. We then explore the utility of the Sentinel-3A Delay-Doppler altimeter for mapping ice sheet elevation change. We show that with only 2 years of available data, it is possible to resolve known signals of ice dynamic imbalance and to detect evidence of subglacial lake drainage activity. Our analysis demonstrates a new, long-term source of measurements of ice sheet elevation and elevation change, and the early potential of this operational system for monitoring ice sheet imbalance for decades to come. © Author(s) 2019.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122659
Appears in Collections:气候变化事实与影响

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作者单位: UK Centre for Polar Observation and Modelling, Centre of Excellence in Environmental Data Science, Lancaster University, Lancaster, LA1 4YW, United Kingdom; Department of Space and Climate Physics, Mullard Space Science Laboratory, University College London, Gower Street, London, WC1E 6BT, United Kingdom; Centre for Polar Observation and Modelling, University of Leeds, Leeds, LS2 9JT, United Kingdom; IsardSAT Ltd, Surrey Space Incubator, 40 Occam Road, Surrey Research Park, Guildford, Surrey, GU2 7YG, United Kingdom; CLS, 11 Rue Hermes, Parc Technologique du Canal, Ramonville Saint-Agne, 31520, France; SERCO, C/o ESA ESRIN, Largo Galileo Galilei, 1, Frascati RM, 00044, Italy; DEIMOS, C/o ESA ESRIN, Largo Galileo Galilei, 1, Frascati RM, 00044, Italy; ESA ESRIN, Largo Galileo Galilei, 1, Frascati RM, 00044, Italy

Recommended Citation:
McMillan M.,Muir A.,Shepherd A.,et al. Sentinel-3 Delay-Doppler altimetry over Antarctica[J]. Cryosphere,2019-01-01,13(2)
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