Measuring the location and width of the Antarctic grounding zone using CryoSat-2
TL;DR: In this paper, the limit of the tidal flexure (point F) and hydrostatic equilibrium (point H) of the grounding zone of Antarctic floating ice shelves from CryoSat-2 standard and swath elevation data were mapped.
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Abstract: . We present the results of mapping the limit of the tidal flexure (point F) and hydrostatic equilibrium (point H) of the grounding zone of Antarctic ice shelves from CryoSat-2 standard and swath elevation data. Overall we were able to map 31 % of the grounding zone of the Antarctic floating ice shelves and outlet glaciers. We obtain near-complete coverage of the Filchner–Ronne Ice Shelf. Here we manage to map areas of Support Force Glacier and the Doake Ice Rumples, which have previously only been mapped using break-in-slope methods. Over the Ross Ice Shelf, Dronning Maud Land and the Antarctic Peninsula, we obtained partial coverage, and we could not map a continuous grounding zone for the Amery Ice Shelf and the Amundsen Sea sector. Tidal amplitude and distance south (i.e. across-track spacing) are controlling factors in the quality of the coverage and performance of the approach. The location of the point F agrees well with previous observations that used differential satellite radar interferometry (DInSAR) and ICESat-1, with an average landward bias of 0.1 and 0.6 km and standard deviation of 1.1 and 1.5 km for DInSAR and ICESat measurements, respectively. We also compared the results directly with DInSAR interferograms from the Sentinel-1 satellites, acquired over the Evans Ice Stream and the Carlson Inlet (Ronne Ice Shelf), and found good agreement with the mapped points F and H. We also present the results of the spatial distribution of the grounding zone width (the distance between points F and H) and used a simple elastic beam model, along with ice thickness calculations, to calculate an effective Young modulus of ice of E = 1.4 ± 0.9 GPa.
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Citations
A high-resolution Antarctic grounding zone product from ICESat-2 laser altimetry
08 Feb 2022
TL;DR: Li et al. as mentioned in this paper presented the first ICESat-2-derived high-resolution grounding zone product of the Antarctic Ice Sheet, including three important boundaries: the inland limit of tidal flexure (Point F), inshore limit of hydrostatic equilibrium (Point H), and the break in slope (Point Ib).
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Grounding zone ice thickness from InSAR: Inverse modelling of tidal elastic bending
Oliver J. Marsh,Wolfgang Rack,Nicholas R. Golledge,Wendy Lawson,Dana Floricioiu +4 more
- 01 May 2014
TL;DR: In this article, a new inverse modeling optimization approach was proposed to estimate ice thickness in the grounding zone of Antarctic outlet glaciers and ice shelves using spatial patterns of tide-induced flexure derived from differential interferometric synthetic aperture radar (InSAR).
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Mapping the Antarctic Grounding Zone from ICESat-2 Laser Altimetry
TL;DR: In this paper, the authors presented the results of mapping the grounding zone of the Antarctic Ice Sheet using laser altimetry from the ICESat-2 satellite, based on a combination of repeat track data and crossover analysis of ascending and descending tracks.
Marginal detachment zones: the fracture factories of ice shelves?
10 Oct 2022
TL;DR: In this article , the authors employ the software package \textit{icepack} to demonstrate that longitudinally decreasing marginal resistance reproduces observed transitions in flow regime, and they show that these spatial transitions are accompanied by near-margin tension sufficient to explain full-thickness rifts.
of Antarctic tidal grounding line migration revealed by ICESat-2 laser altimetry”
TL;DR: In this article , Bryony Freer and co-authors mapped the short-term variations in grounding line locations at the Bungenstockrücken Ice Plain using ICESat-2 satellite laser altimetry with a new approach of calculating elevation anomalies.
References
Bedmap2: improved ice bed, surface and thickness datasets for Antarctica
Peter T. Fretwell,Hamish D. Pritchard,David G. Vaughan,Jonathan L. Bamber,Nicholas E. Barrand,Ruth Bell,Cesidio Bianchi,Robert Bingham,Donald D. Blankenship,Gino Casassa,Ginny A. Catania,Denis Callens,Howard Conway,Alison J. Cook,Hugh F. J. Corr,Detlef Damaske,Volkmar Damm,Fausto Ferraccioli,René Forsberg,Shuji Fujita,Y. Gim,Prasad Gogineni,J. A. Griggs,Richard C. A. Hindmarsh,Per Holmlund,John W. Holt,Robert W. Jacobel,Adrian Jenkins,Wilfried Jokat,Tom A. Jordan,Edward C. King,Jack Kohler,William B. Krabill,M. Riger-Kusk,Kirsty Langley,German Leitchenkov,Carl Leuschen,Bruce P. Luyendyk,Kenichi Matsuoka,Jeremie Mouginot,F. O. Nitsche,Yoshifumi Nogi,Ole Anders Nøst,S. V. Popov,Eric Rignot,David M. Rippin,Andrés Rivera,Jason L. Roberts,Neil Ross,Martin J. Siegert,Andrew Smith,Daniel Steinhage,Michael Studinger,Bo Sun,B. K. Tinto,Brian C. Welch,Douglas S. Wilson,Duncan A. Young,Cui Xiangbin,Achille Zirizzotti +59 more
TL;DR: Bedmap2 as discussed by the authors is a suite of gridded products describing surface elevation, ice-thickness and the seafloor and subglacial bed elevation of the Antarctic south of 60° S. In particular, the Bedmap2 ice thickness grid is made from 25 million measurements, over two orders of magnitude more than were used in Bedmap1.
Widespread, rapid grounding line retreat of Pine Island, Thwaites, Smith, and Kohler glaciers, West Antarctica, from 1992 to 2011
TL;DR: The authors measured the grounding line retreat of glaciers draining the Amundsen Sea sector of West Antarctica using Earth Remote Sensing (ERS-1/2) satellite radar interferometry from 1992 to 2011.
Two-dimensional phase unwrapping with use of statistical models for cost functions in nonlinear optimization
Curtis W. Chen,Howard A. Zebker +1 more
TL;DR: This work develops a maximum a posteriori probability (MAP) estimation approach for interferometric radar techniques, and derives an algorithm that approximately maximizes the conditional probability of its phase-unwrapped solution given observable quantities such as wrapped phase, image intensity, and interferogram coherence.
821
Calving fluxes and basal melt rates of Antarctic ice shelves
Mathieu Depoorter,Jonathan L. Bamber,J. A. Griggs,Jtm Lenaerts,Srm Ligtenberg,M. R. van den Broeke,Geir Moholdt +6 more
TL;DR: Almost half of the ice-sheet surface mass gain is lost through oceanic erosion before reaching the ice front, and the calving flux is about 34 per cent less than previous estimates derived from iceberg tracking, suggesting that basal mass loss is a valuable metric for predicting future ice-shelf vulnerability to oceanic forcing.
The Reference Elevation Model of Antarctica
TL;DR: The Reference Elevation Model of Antarctica (REMA) as discussed by the authors is the first continental-scale digital elevation model (DEM) at a resolution of less than 10m, which was created from stereophotogrammetry with submeter-resolution optical, commercial satellite imagery.