Thursday, 30 August 2007 - 3:40 PM

New marine sediment core data support Holocene stability of the Larsen B Ice Shelf

Eugene W. Domack1, Amy Leventer2, Veronica Willmott3, S. Brachfeld4, Scott E. Ishman5, Bruce Huber6, Michele Rebesco7, Fabrizio Zgur7, Laurie Padman8, and Robert Gilbert9. (1) Geosciences, Hamilton College, 198 College Hill Road, Clinton, NY 13323, (2) Geology Department, Colgate University, 13 Oak Drive, Hamilton, NY 13346, (3) Department of Geosciences, Hamilton College, 198 College Hill Rd., Clinton, NY 13323, (4) Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, (5) Geology, Southern Illinois University-Carbondale, Parkinson Lab 303, Mail Code 4324, Carbondale, IL 62901, (6) Lamont Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, (7) RIMA, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/C, Sgonico (TS), Italy, (8) Earth & Space Research, 3350 SW Cascade Ave., Corvallis, OR 97333, (9) Department of Geography, Queens University, Kingston, ON ON K7L 2N6, Canada

A multi-proxy data set, including sedimentologic, geochemical, and micropaleontologic analyses, has been developed for kasten cores collected from the Larsen B embayment during two research cruises, LMG0502 and NBP0603. Chronologies for the cores are constrained through a combination of radiocarbon and 210Pb analyses. These records add to those previously published (Domack et al., 2005) and conclusively demonstrate that the Larsen B Ice Shelf was a persistent presence throughout the Holocene, until its most recent collapse in March 2002. This observation is significant, indicating that modern climate perturbations in the region have had a greater impact on the Larsen B Ice Shelf than natural variability of the Holocene.