Unraveling inSAR observed antarctic ice-shelf flexure using

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TitleUnraveling inSAR observed antarctic ice-shelf flexure using 2-D elastic and viscoelastic modelingAbstractIce-shelf grounding zones link the Antarctic ice-sheets to the ocean. Differential interferometric synthetic aperture radar (DInSAR) is commonly used to monitor grounding-line locations, but also contains information on grounding-zone ice thickness, ice properties and tidal conditions beneath the ice shelf. Here, we combine in-situ data with numerical modeling of ice-shelf flexure to investigate 2-D controls on the tidal bending pattern on the Southern McMurdo Ice Shelf. We validate our results with 9 double-differential TerraSAR-X interferograms. It is necessary to make adjustments to the tidal forcing to directly compare observations with model output and we find that when these adjustments are small (<1.5 cm) a viscoelastic model matches better, while an elastic model is more robust overall. Within landward embayments, where lateral stresses fromsurrounding protrusions damp the flexural response, a 2-Dmodel captures behavior that is missed in simple 1-D models. We conclude that improvements in current tide models are required to allow for the full exploitation of DInSAR in grounding-zone glaciology. © 2018 Wild, Marsh and Rack.

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1st AuthorWild, C. AuthorWild, C.Marsh, O.Rack, W.Year2018JournalFrontiers in Earth ScienceVolume6DOI10.3389/feart.2018.00028URLhttps://www.scopus.com/inward/recor.....3cfcad824205e48cab8cfa77fPublisherFrontiers Media S.A.Author Keywords2-D finite element modelCryoSat-2Grounding lineIce-shelf flexureInterferometric SARMcMurdo Ice ShelfTerraSAR-XViscoelastic bending

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CitationWild, C., Marsh, O. and Rack, W. (2018). Unraveling inSAR observed antarctic ice-shelf flexure using 2-D elastic and viscoelastic modeling. Frontiers in Earth Science, 6Antarctica NZ supported?YesNZARI?No