USAP-DC

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Holocene Deglaciation of the Western Ross Embayment: Constraints from East Antarctic Outlet Glaciers Start Date: 2016-08-01 End Date: 2022-07-31 Project Website(s) Description/Abstract Reconstructions of past changes in thickness and extent of the Antarctic ice sheet are important for evaluating past and present sea-level change, and for validating numerical models necessary to make realistic predictions of changes under future climate and ocean conditions. Models estimate that the Ross Sea sector was one of the largest contributors to sea-level rise from Antarctica as the ice sheet adjusted during the past ten thousand years from the glacial period to the Holocene. In this sector, ice flow into the embayment comes through West Antarctic ice streams and through East Antarctic outlet glaciers that flow through the Transantarctic Mountains. Observational data constrain the last glacial maximum and the Holocene retreat, but models are necessary to understand the environmental conditions needed for outlet glaciers to reach observed high stands, to fit the observed patterns of retreat, and to understand how the contribution of ice from West Antarctica and from East Antarctica changed over time. The investigators will use available geological and geophysical data in combination with forward ice-flow models and inverse models to investigate the evolution of the four Transantarctic outlet glaciers where sufficient data exist. The objectives of this new modeling are to constrain the glaciological conditions necessary for these glaciers to thicken during the last glacial, thin during the Holocene, and reach their present-day state. By testing specific hypotheses this work contributes to an interdisciplinary effort to understand Holocene deglaciation of the Ross Sea Embayment. In addition, the modeling will address the resolving power of the available data to answer key questions for each target glacier. Broader impacts include mentoring a graduate student, public outreach, incorporation of research into high-school and university classes, and support of an early-career investigator. Personnel Person Role Koutnik, Michelle Investigator and contact Smith, Ben Co-Investigator Conway, Howard Co-Investigator Shapero, Daniel Investigator Funding Antarctic Glaciology Award # 1542756 AMD - DIF Record(s) USAP-1542756_1 Data Management Plan None in the Database Product Level: 4 (model output and interpretations) Datasets Repository Title (link) Format(s) Status GitHub Beardmore Glacier model in 'icepack' Not Provided exists Publications Hillebrand, T. R., Stone, J. O., Koutnik, M., King, C., Conway, H., Hall, B., … Gillespie, M. K. (2021). Holocene thinning of Darwin and Hatherton glaciers, Antarctica, and implications for grounding-line retreat in the Ross Sea. The Cryosphere, 15(7), 3329–3354. (doi:10.5194/tc-15-3329-2021) Christian, J. E., Robel, A. A., Proistosescu, C., Roe, G., Koutnik, M., and Christianson, K. (2020). The contrasting response of outlet glaciers to interior and ocean forcing. 14. The Cryosphere, 14. 2515. (doi:10.5194/tc-14-2515-2020) Hillebrand, T. R., Stone, J. O., Koutnik, M., King, C., Conway, H., Hall, B., … Gillespie, M. K. (2020). Holocene thinning and grounding-line retreat of Darwin and Hatherton Glaciers, Antarctica. (doi:10.5194/tc-2020-356) Keywords GLACIER THICKNESS/ICE SHEET THICKNESS GLACIERS Transantarctic Mountains