Ice loss processes in the Seal Nunataks ice shelf region from satellite altimetry and imagery

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dc.contributor.authorShuman, Christopher
dc.contributor.authorScambos, Ted
dc.contributor.authorBerthier, Etienne
dc.date.accessioned2022-02-15T13:25:37Z
dc.date.available2022-02-15T13:25:37Z
dc.date.issued2016-09-09
dc.description.abstractThe Seal Nunataks ice shelf (SNIS, ∼743 km² in 2013) is an unofficial name for a remnant area between the former Larsen A and Larsen B ice shelves off the northeastern Antarctic Peninsula. Analyses using Landsat 7 ETM+ and Terra ASTER images from 2001 to 13 and ICESat altimetry from 2003 to 09 show it has retreated and thinned following the Larsen A (1995) and Larsen B (2002) disin tegrations. Despite some regional cooling and more fast ice since 2008, SNIS continues to lose ice along its margins and may be losing contact with some nunataks. Detailed analysis of data from four ICESat tracks indicates that ice shelf thinning rates range between 1.9 and 2.7 m a⁻¹ , and generally increase from west to east. An ICESat repeat track crossing the adjacent Robertson Island shows a mean elevation loss of 1.8 m a⁻¹. Two tracks crossing the SNIS’s remaining tributary, Rogosh Glacier, show sub-meter elevation losses. Comparing shelf remnant and grounded ice thinning rates implies that basal ocean melting augments SNIS thinning by ∼1ma⁻¹, a rate that is consistent with other estimates of ocean-driven shelf thinning in the region.en_US
dc.description.sponsorshipThe authors would like to acknowledge the support of H. Pritchard for additional insights on a previously published analysis for the area (Pritchard and others, 2012). The authors would also like to thank J. Bohlander, K. Melocik, V. Suchdeo, and P. Vornberger for help with aspects of the imagery analysis. This project also benefitted from the help of M. Siegfried and L. Padman regarding the best available ocean tide model for the ICESat data. The ICESat data for this paper are available at the NASA Distributed Active Archive Center at the National Snow and Ice Data Center (GLA12 – GLAS/ICESat L2 Antarctic and Greenland Ice Sheet Altimetry Data). The Landsat data were acquired at no cost via the Earth Explorer website from the US Geological Survey’s Earth Resource Observation and Science Center (EROS), home of the national archive for Landsat imagery. The ASTER data were provided at no cost through the Global Land Ice Measurements from Space (GLIMS) project. This work was supported by NSF and NASA grants to T. Scambos (NSF ANT-0732921; NASA NNX10AR76G), the TOSCA and ISIS programs of the French Space Agency (CNES) to E. Berthier, and NASA Cryospheric Sciences Program funds to C. Shuman. The final paper benefitted from the many helpful comments provided by two anonymous reviewers.en_US
dc.description.urihttps://www.cambridge.org/core/journals/annals-of-glaciology/article/ice-loss-processes-in-the-seal-nunataks-ice-shelf-region-from-satellite-altimetry-and-imagery/36F2854C443FB865404F09C578B0F08Aen_US
dc.format.extent11 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m28j8j-oywj
dc.identifier.citationShuman, C., Scambos, T., & Berthier, E. (2016). Ice loss processes in the Seal Nunataks ice shelf region from satellite altimetry and imagery. Annals of Glaciology, 57(73), 94-104. doi:10.1017/aog.2016.29en_US
dc.identifier.urihttps://doi.org/10.1017/aog.2016.29
dc.identifier.urihttp://hdl.handle.net/11603/24268
dc.language.isoen_USen_US
dc.publisherCambridge Coreen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleIce loss processes in the Seal Nunataks ice shelf region from satellite altimetry and imageryen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9606-767Xen_US

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