Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation Medley, Brooke Joughin, Ian Smith, B. E. Das, Sarah B. Steig, Eric J. Conway, Howard Gogineni, S. Lewis, Cameron Criscitiello, Alison S. McConnell, Joseph R. van den Broeke, Michiel R. Lenaerts, Jan T. M. Bromwich, D. H. Nicolas, J. P. Leuschen, C. 2014-10-23T16:50:16Z 2014-10-23T16:50:16Z 2014-07-31
dc.description © The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Cryosphere 8 (2014): 1375-1392, doi:10.5194/tc-8-1375-2014. en_US
dc.description.abstract In Antarctica, uncertainties in mass input and output translate directly into uncertainty in glacier mass balance and thus in sea level impact. While remotely sensed observations of ice velocity and thickness over the major outlet glaciers have improved our understanding of ice loss to the ocean, snow accumulation over the vast Antarctic interior remains largely unmeasured. Here, we show that an airborne radar system, combined with ice-core glaciochemical analysis, provide the means necessary to measure the accumulation rate at the catchment-scale along the Amundsen Sea coast of West Antarctica. We used along-track radar-derived accumulation to generate a 1985–2009 average accumulation grid that resolves moderate- to large-scale features (>25 km) over the Pine Island–Thwaites glacier drainage system. Comparisons with estimates from atmospheric models and gridded climatologies generally show our results as having less accumulation in the lower-elevation coastal zone but greater accumulation in the interior. Ice discharge, measured over discrete time intervals between 1994 and 2012, combined with our catchment-wide accumulation rates provide an 18-year mass balance history for the sector. While Thwaites Glacier lost the most ice in the mid-1990s, Pine Island Glacier's losses increased substantially by 2006, overtaking Thwaites as the largest regional contributor to sea-level rise. The trend of increasing discharge for both glaciers, however, appears to have leveled off since 2008. en_US
dc.description.sponsorship This research was supported at UW by NSF OPP grants ANT-0631973 (B Medley, I. Joughin, E. J. Steig, and H. Conway) and ANT-0424589 (B. Medley and I. Joughin). Work at WHOI was supported by NSF OPP grant ANT-0632031 and NASA grant NNX10AP09G (S. B. Das and A. S. Criscitiello). D. H. Bromwich and J. P. Nicolas were supported by NASA grant NN12XAI29G and NSF grant ANT-1049089. en_US
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dc.identifier.citation Cryosphere 8 (2014): 1375-1392 en_US
dc.identifier.doi 10.5194/tc-8-1375-2014
dc.language.iso en en_US
dc.publisher Copernicus Publications on behalf of the European Geosciences Union en_US
dc.rights Attribution 3.0 Unported *
dc.title Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation en_US
dc.type Article en_US
dspace.entity.type Publication
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