Modelling Antarctic sea-level data to explore the possibility of a dominant Antarctic contribution to meltwater pulse IA |
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| Institution: | 1. Department of Earth Sciences, Durham University, Science Laboratories, Durham DH1 3LE, UK;2. Department of Geography, Durham University, Science Laboratories, Durham DH1 3LE, UK;3. British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK;4. Departement Geografie, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussel, Belgium;5. Alfred-Wegener-Institut für Polar- und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany;1. Department of Earth Science, University of California Santa Barbara, 1006 Webb Hall, Santa Barbara, CA, 93106, USA;2. Department of Geography, Durham University, Durham, DH1 3LE, UK;3. Department of Environmental Sciences, University of Virginia, Clark Hall 205, 291 McCormick Road, Charlottesville, VA, 22904, USA;4. Department of Physics, East Carolina University, Howell Science Complex, Rm C-209, 1000 E. 5th Street, Greenville, NC, 27858, USA;1. Department of Physics, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5;2. Department of Earth Sciences, University of Ottawa, Ontario, Canada K1N 6N5;1. Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA;2. Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA;3. Center for Earthquake Research and Information, The University of Memphis, Memphis, TN 38152, USA;4. Institut de Physique du Globe de Strasbourg, Université de Strasbourg/CNRS, Strasbourg, France;5. School of Earth Sciences, Ohio State University, 275 Mendenhall Laboratory, Columbus, OH 43210, USA;6. Ciencias de la Tierra, Dirección Nacional del Antártico – Instituto Antártico Argentino, Argentina;7. Geophysics Laboratory, University of Luxembourg, Luxembourg L-1359, Luxembourg;1. Rice University Department of Earth Science, 6100 Main St., MS-126, Houston, TX 77005, USA;2. University of Texas Institute for Geophysics, Jackson School of Geosciences, J.J. Pickle Research Campus, Bldg. 196, 10100 Burnet Road (R2200), Austin, TX 78758-4445, USA;3. University of Houston Department of Earth and Atmospheric Sciences, 4800 Calhoun Road, Houston, TX 77204-2693, USA;1. Department of Geography, Durham University, Durham, DH1 3LE, UK;2. Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, Wales, UK;3. Department of Geography, University of Sheffield, Sheffield, S10 2TN, UK;4. British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK;5. Department of Geography, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK;6. Department of Earth Sciences, Rice University, 6100 Main Street, Houston, TX, USA;7. CRG Marine Geosciences, Department of Stratigraphy, Paleontology and Marine Geosciences, Faculty of Geology, University Barcelona, Campus de Pedralbes, C/Marti i Franques s/n, 08028, Barcelona, Spain;8. College of Marine Science, University of South Florida, 140 7th Avenue South, St. Petersburg, FL 33701-5016, USA;9. Scott Polar Research Institute, University of Cambridge, Cambridge, CB2 1ER, UK;10. Department of Geography, University of Loughborough, Loughborough, LE11 3TU, UK;11. Department of Earth Science, University of California, Santa Barbara, 1006 Webb Hall, Santa Barbara, CA, 93106, USA |
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| Abstract: | We compare numerical predictions of glaciation-induced sea-level change to data from 8 locations around the Antarctic coast in order to test if the available data preclude the possibility of a dominant Antarctic contribution to meltwater pulse IA (mwp-IA). Results based on a subset of 7 spherically symmetric earth viscosity models and 6 different Antarctic deglaciation histories indicate that the sea-level data do not rule out a large Antarctic source for this event. Our preliminary analysis indicates that the Weddell Sea is the most likely source region for a large (～9 m) Antarctic contribution to mwp-IA. The Ross Sea is also plausible as a significant contributor (～5 m) from a sea-level perspective, but glacio-geological field observations are not compatible with such a large and rapid melt from this region. Our results suggest that the Lambert Glacier component of the East Antarctic ice sheet experienced significant retreat at the time of mwp-IA, but only contributed ～0.15 m (eustatic sea-level change). All of the ice models considered under-predicted the isostatic component of the sea-level response in the Antarctic Peninsula and the Sôya Coast region of the East Antarctic ice sheet, indicating that the maximum ice thickness in these regions is underestimated. It is therefore plausible that ice melt from these areas, the Antarctic Peninsula in particular, could have made a significant contribution to mwp-IA. |
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