DOI: 10.5194/tc-14-3629-2020
论文题名: Mapping the grounding zone of Larsen C Ice Shelf, Antarctica, from ICESat-2 laser altimetry
作者: Li T. ; Dawson G.J. ; Chuter S.J. ; Bamber J.L.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 11 起始页码: 3629
结束页码: 3643
语种: 英语
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
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). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164521
Appears in Collections: 气候变化与战略
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作者单位: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, United Kingdom
Recommended Citation:
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]. Cryosphere,2020-01-01,14(11)