USAP-DC

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COLLABORATIVE RESEARCH: Resolving Ambiguous Exposure-Age Chronologies of Antarctic Deglaciation with Measurements of In-Situ-Produced Cosmogenic Carbon-14 Start Date: 2016-05-01 End Date: 2021-04-30 Description/Abstract This project focused on geochemical measurements on rock samples from Antarctica that can be used to reconstruct changes in the size and thickness of the Antarctic ice sheets during the past several thousand years. It applied relatively newly developed technology for measurement of cosmic-ray-produced carbon-14 in quartz to gather new and better information on past ice sheet change from rock samples previously collected in past research in Antarctica. Specifically, it aimed to address a lack of information on past ice sheet change from the Weddell Sea embayment, and the primary result of the project is an improved understanding of ice volume change in this sector of Antarctica during the past ca. 15,000 years. This, in turn, is important in understanding the contribution of the Antarctic ice sheets to global sea level change during this time period. Personnel Person Role Goehring, Brent Investigator and contact Balco, Gregory Co-Investigator Funding Antarctic Earth Sciences Award # 1542976 Antarctic Earth Sciences Award # 1542936 AMD - DIF Record(s) USAP-1542936_1 Data Management Plan AntC14_DMP.pdf Product Level: 1 (processed data) Datasets Repository Title (link) Format(s) Status ICE-D Interface for viewing observational data related to exposure ages measurements and calculated geologic ages derived therefrom Not Provided exists Publications Nichols, K.A., Goehring, B.M., Balco, G., Johnson, J.S., Hein, A.S. and Todd, C., 2019. New Last Glacial Maximum ice thickness constraints for the Weddell Sea Embayment, Antarctica. The Cryosphere, 13(11), pp.2935-2951. (doi: 10.5194/tc-13-2935-2019) Nichols, K. A., Goehring, B. M., Balco, G., Johnson, J. S., Hein, A. S., & Todd, C. (2019). New Last Glacial Maximum ice thickness constraints for the Weddell Sea Embayment, Antarctica. The Cryosphere, 13(11), 2935–2951. (doi:10.5194/tc-13-2935-2019) Nichols, K. A., Goehring, B. M., Balco, G., Johnson, J. S., Hein, A. A., & Todd, C. (2019). New Last Glacial Maximum Ice Thickness constraints for the Weddell Sea sector, Antarctica. (doi:10.5194/tc-2019-64) Keywords Amd/Us Carbon-14 Cosmogenic Dating GLACIATION GLACIER ELEVATION/ICE SHEET ELEVATION GLACIER THICKNESS/ICE SHEET THICKNESS GLACIERS/ICE SHEETS Weddell Sea Embayment Platforms and Instruments FIELD SURVEYS LABORATORY