USAP-DC

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Collaborative Research: Constraining West Antarctic Ice Sheet elevation during the last interglacial Start Date: 2018-09-01 End Date: 2023-08-31 Description/Abstract Projecting future changes in West Antarctic Ice Sheet (WAIS) volume and global sea level rise in response to anthropogenic climate warming requires dynamic ice sheet models, which are enhanced by testing and calibrating with geologic evidence. Successfully modeling WAIS behavior during past collapse events provides a basis for predictions of future sea level change. Exposure ages of erratics and bedrock throughout west Antarctica constrain higher-than-present WAIS geometry during the LGM and the last deglaciation. Quantifying the past surface elevation from the interior of the ice sheet is especially useful as it directly constrains ice thickness and volume where most of the mass is located. Data that determines WAIS geometry during the last interglacial, the last time that climate was warmer than present and when global sea level was 3-6 m higher, is critical for empirically constraining changes in WAIS volume and its contribution to sea level, as well as, to calibrate ice sheet models. These datasets are essentially non- existent, as such evidence is now covered by the WAIS. Initial results from ground-penetrating radar surveys indicate ice depths around 1200 m. Personnel Person Role Braddock, Scott Investigator and contact Campbell, Seth Investigator Ackert, Robert Investigator Zimmerer, Matthew Investigator Mitrovica, Jerry Investigator Funding Antarctic Earth Sciences Award # 1745015 Antarctic Earth Sciences Award # 1744949 Antarctic Earth Sciences Award # 1744927 AMD - DIF Record(s) USAP-1744927_1 Data Management Plan None in the Database Product Level: 0 (raw data) Datasets Repository Title (link) Format(s) Status USAP-DC Mt. Waesche ground-penetrating radar data 2018-2019 CSV; Binary exists Publications Dunbar, N. W., Iverson, N. A., Smellie, J. L., McIntosh, W. C., Zimmerer, M. J., & Kyle, P. R. (2021). Chapter 7.4 Active volcanoes in Marie Byrd Land. Geological Society, London, Memoirs, 55(1), 759–783. (doi:10.1144/m55-2019-29) Braddock, S., Venturelli, R. A., Nichols, K., Moravec, E., Boeckmann, G. V., Campbell, S., Balco, G., Ackert, R., Small, D., Johnson, J. S., Dunbar, N., Woodward, J., Mukhopadhyay, S., & Goehring, B. (2024). Lessons learned from shallow subglacial bedrock drilling campaigns in Antarctica. Annals of Glaciology, 1–35. (doi:10.1017/aog.2024.12) Keywords Amd/Us GLACIER THICKNESS/ICE SHEET THICKNESS LAVA COMPOSITION/TEXTURE Mt. Waesche PALEOCLIMATE RECONSTRUCTIONS SNOW/ICE Platforms and Instruments FIELD SURVEYS LABORATORY