气候变化领域集成服务门户(CCPortal): Sentinel-3 Delay-Doppler altimetry over Antarctica

CCPortal

DOI	10.5194/tc-13-709-2019
	Sentinel-3 Delay-Doppler altimetry over Antarctica
	McMillan M.; Muir A.; Shepherd A.; Escolà R.; Roca M.; Aublanc J.; Thibaut P.; Restano M.; Ambrozio A.; Benveniste J.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	709
结束页码	722
卷号	13 期号:2
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.
学科领域	accuracy assessment; airborne survey; altimeter; Doppler radar; elevation; glaciology; ice sheet; measurement method; model validation; precision; radar altimetry; Sentinel; subglacial environment; time series analysis; topography; Antarctic Ice Sheet; Antarctica
语种	英语
scopus关键词	accuracy assessment; airborne survey; altimeter; Doppler radar; elevation; glaciology; ice sheet; measurement method; model validation; precision; radar altimetry; Sentinel; subglacial environment; time series analysis; topography; Antarctic Ice Sheet; Antarctica
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118919
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
推荐引用方式 GB/T 7714	McMillan M.,Muir A.,Shepherd A.,et al. Sentinel-3 Delay-Doppler altimetry over Antarctica[J],2019,13(2).
APA	McMillan M..,Muir A..,Shepherd A..,Escolà R..,Roca M..,...&Benveniste J..(2019).Sentinel-3 Delay-Doppler altimetry over Antarctica.The Cryosphere,13(2).
MLA	McMillan M.,et al."Sentinel-3 Delay-Doppler altimetry over Antarctica".The Cryosphere 13.2(2019).