Collaborative Research: Paleohistory of the Larsen Ice Shelf System: Phase IIEntry ID: NSF-ANT03-38220
Abstract: The Larsen Ice Shelf is the third largest ice shelf in Antarctica and has continued a pattern of catastrophic decay since the mid 1990's. The proposed marine geologic work at the Larsen Ice Shelf builds upon our previous NSF-OPP funding and intends to test the working hypothesis that the Larsen B Ice Shelf system has been a stable component of Antarctica's glacial system since it formed during ... rising sea levels 10,000 years BP. This conclusion, if supported by observations from our proposed work, is an important first step in establishing the uniqueness and consequences of rapid regional warming currently taking place across the Peninsula. Our previous work in the Larsen A and B embayments has allowed us to recognize the signature of past ice shelf fluctuations and their impact on the oceanographic and biologic environments. We have also overcome many of the limitations of standard radiocarbon dating in Antarctic marine sequences by using variations in the strength of the earth's magnetic field for correlation of sediment records and by using specific organic compounds (instead of bulk sediment) for radiocarbon dating. We intend to pursue these analytical advances and extend our sediment core stratigraphy to areas uncovered by the most recent collapse of the Larsen B Ice Shelf and areas immediately adjacent to the Larsen C Ice Shelf. In addition to the core recovery program, we intend to utilize our unique access to the ice shelf front to continue our observations of the snow/ice stratigraphy, oceanographic character, and ocean floor character. Sediment traps will also be deployed in order to measure the input of debris from glaciers that are now surging in response to the ice shelf collapse. This proposal is a multi-institutional, international (USAP, Italy, and Canada) effort that combines the established expertise in a variety of disciplines and integrates the research plan into the educational efforts of primarily undergraduate institutions but including some graduate education. This is a three-year project with field seasons planned with flexibility in order to accommodate schedules for the RVIB L.M. Gould. The Antarctic Peninsula is undergoing greater warming than almost anywhere on Earth, perhaps associated with human-induced greenhouse effects. Our proposed work contributes to understanding of these changes where they are occurring first and with greatest magnitude and impact upon the environment.
Start Date: 2004-04-15Stop Date: 2009-03-31
ISO Topic Category
Data Set Progress
Email: sishman at geo.siu.edu, sishman at siu.edu
Department of Geology, MC 4324 Southern Illinois University 1259 Lincoln Drive
Province or State: IL
Postal Code: 62901
Domack, E, D. Duran, A. Leventer, S. Ishman, S. Doane, S. McCallum, D. Amblas, J. Ring, R. Gilbert, and M. Prentice. "Stability of the Larsen B ice shelf on the Antarctic Peninsula during the Holocene epoch.," Nature, v.436, 2005, p. 681.
Domack, E., S. Ishman, A. Leventer, S. Sylva, V. Willmott and B. Huber. "A chemotrophic ecosystem found beneath Antarctic ice shelf.," Eos, Transactions, American Geophysical Union,, v.86(29), 2005, p. 271.
Ishman, S., M. Prentice, S. McCallum, A. Leventer and E. Domack. "Biogenic and Stable Isotopic Evidence for Holocene Stability of the Larsen-B Ice Shelf.," Eos Trans. AGU, Fall Meet. Suppl., v.86(52), 2005, p. C21B-1101.
Ishman, S.E. and E.W. Domack. "Marine records of Holocene climatic variability from the Antarctic Peninsula margin.," International Symposium on New Approaches to the Quaternary Sciences in Fuego-Patagonia, Puerto Natales, Chile, Abstracts with Program, v.1, 2005, p. 21.
Leventer, A. E. Domack, S. Ishman, S. Sylva, V. Willmott, B. Huber and L. Padman. "Chemotrophic Ecosystem Beneath the Larsen Ice Shelf, Antarctica.," Eos Trans. AGU, Fall Meet. Suppl., v.86(52), 2005, p. C12B-08.
Leventer, A. E. Domack, S. Ishman, V. Willmott, J. Smith, B. Huber, S. Brachfeld, R. Gilbert and L. Padman. "What Lay Beneath the Larsen B Ice Shelf: Results of the First Survey of a Large Modern Sub Ice Shelf Deposystem.," Eos Trans. AGU, Fall Meet. Suppl., v.86(52), 2005, p. C21B-1103.
Patterson, M., A. Leventer, A. Drake, E. Domack, A. Buffen, S. Ishman, P. Szymcek, S. Brachfeld and E. Backman. "Mid Holocene Warmth in the Antarctic Peninsula: evidence from the Vega Drift.," Eos Trans. AGU, Fall Meet. Suppl., v.86(52), 2005, p. PP41A-062.
Perez, R.B., S. Brachfeld, M. Gorring, A. Leventer, J. Maritz, E.W. Domack, S. Ishman, R. Gilbert. "Geochemical and rock-magnetic analyses of kasten cores from the Joinville-d'Urville Trough, Northeastern Antarctic Peninsula: Results and correlation with the Western Antarctic Peninsula.," Eos Trans. AGU, Fall Meet. Suppl., v.86(52), 2005, p. PP41A-062.
Szymcek, P., S.E. Ishman, S.D. McCallum. "Modern Foraminiferal Biofacies of the Antarctic Peninsula Continental Margin.," Eos Trans. AGU, Jt. Assem. Suppl., v.86(18), 2005, p. PP23B-01.
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Creation and Review Dates
DIF Creation Date: 2009-05-30
Last DIF Revision Date: 2009-06-04