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Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project I: Antarctica
Author(s) -
Nowicki Sophie,
Bindschadler Robert A.,
AbeOuchi Ayako,
Aschwanden Andy,
Bueler Ed,
Choi Hyeungu,
Fastook Jim,
Granzow Glen,
Greve Ralf,
Gutowski Gail,
Herzfeld Ute,
Jackson Charles,
Johnson Jesse,
Khroulev Constantine,
Larour Eric,
Levermann Anders,
Lipscomb William H.,
Martin Maria A.,
Morlighem Mathieu,
Parizek Byron R.,
Pollard David,
Price Stephen F.,
Ren Diandong,
Rignot Eric,
Saito Fuyuki,
Sato Tatsuru,
Seddik Hakime,
Seroussi Helene,
Takahashi Kunio,
Walker Ryan,
Wang Wei Li
Publication year - 2013
Publication title -
journal of geophysical research: earth surface
Language(s) - English
Resource type - Journals
eISSN - 2169-9011
pISSN - 2169-9003
DOI - 10.1002/jgrf.20081
Subject(s) - ice sheet , ice shelf , geology , future sea level , antarctic ice sheet , greenland ice sheet , ice stream , ice sheet model , ice divide , sea ice , oceanography , cryosphere , lead (geology) , climatology , geomorphology
Atmospheric, oceanic, and subglacial forcing scenarios from the Sea‐level Response to Ice Sheet Evolution (SeaRISE) project are applied to six three‐dimensional thermomechanical ice‐sheet models to assess Antarctic ice sheet sensitivity over a 500 year timescale and to inform future modeling and field studies. Results indicate (i) growth with warming, except within low‐latitude basins (where inland thickening is outpaced by marginal thinning); (ii) mass loss with enhanced sliding (with basins dominated by high driving stresses affected more than basins with low‐surface‐slope streaming ice); and (iii) mass loss with enhanced ice shelf melting (with changes in West Antarctica dominating the signal due to its marine setting and extensive ice shelves; cf. minimal impact in the Terre Adelie, George V, Oates, and Victoria Land region of East Antarctica). Ice loss due to dynamic changes associated with enhanced sliding and/or sub‐shelf melting exceeds the gain due to increased precipitation. Furthermore, differences in results between and within basins as well as the controlling impact of sub‐shelf melting on ice dynamics highlight the need for improved understanding of basal conditions, grounding‐zone processes, ocean‐ice interactions, and the numerical representation of all three.