气候变化领域集成服务门户(CCPortal): Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry

CCPortal

DOI	10.5194/tc-14-3629-2020
	Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry
	Li T.; Dawson G.J.; Chuter S.J.; Bamber J.L.
发表日期	2020
ISSN	19940416
起始页码	3629
结束页码	3643
卷号	14 期号:11
英文摘要	We present a new, fully automated method of mapping the Antarctic Ice Sheet's grounding zone using a repeat-track analysis and crossover analysis of newly acquired ICESat-2 laser altimeter data. We map the position of the landward limit of tidal flexure and the inshore limit of hydrostatic equilibrium, as demonstrated over the mountainous and hitherto difficult to survey grounding zone of Larsen C Ice Shelf. Since the start of data acquisition in 2018, our method has already achieved a near 9-fold increase in the number of grounding zone observations compared with ICESat, which operated between 2003 and 2009. We have improved coverage in particular over the previously poorly mapped the Bawden and Gipps ice rises and Hearst Island. Acting as a reliable proxy for the grounding line, which cannot be directly imaged by satellites, our ICESat-2-derived landward limit of tidal flexure locations agrees well with independently obtained measurements, with a mean absolute difference and standard deviation of 0.39 and 0.32 km, respectively, compared to interferometric synthetic-aperture-radar-based observations. Our results demonstrate the efficiency, density, and high spatial accuracy with which ICESat-2 can image complex grounding zones and its clear potential for future mapping of the pan-ice sheet grounding zone. © 2020 Author(s).
英文关键词	automation; CryoSat; data acquisition; grounding line; hydrostatics; image analysis; laser; mapping; satellite altimetry; satellite imagery; Antarctic Ice Sheet; Antarctica; Larsen Ice Shelf; West Antarctica; Satellites
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202143
作者单位	Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, United Kingdom
推荐引用方式 GB/T 7714	Li T.,Dawson G.J.,Chuter S.J.,et al. Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry[J],2020,14(11).
APA	Li T.,Dawson G.J.,Chuter S.J.,&Bamber J.L..(2020).Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry.Cryosphere,14(11).
MLA	Li T.,et al."Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry".Cryosphere 14.11(2020).