USAP-DC

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Modeling Giant Icebergs and Their Decay Start Date: 2018-07-01 End Date: 2021-06-30 Description/Abstract Nearly half of the freshwater flux from the Antarctic Ice Sheet into the Southern Ocean occurs in the form of large tabular icebergs that calve off the continent’s ice shelves. However, because of difficulties in adequately simulating their breakup, large Antarctic icebergs to date have either not been represented in models or represented but with no breakup scheme such that they consistently survive too long and travel too far compared with observations. Here, we introduce a representation of iceberg fracturing using a breakup scheme based on the “footloose mechanism.” We optimize the parameters of this breakup scheme by forcing the iceberg model with an ocean state estimate and comparing the modeled iceberg trajectories and areas with the Antarctic Iceberg Tracking Database. We show that including large icebergs and a representation of their breakup substantially affects the iceberg meltwater distribution, with implications for the circulation and stratification of the Southern Ocean. Personnel Person Role Wagner, Till Investigator and contact Eisenman, Ian Co-Investigator England, Mark Researcher Funding Antarctic Ocean and Atmospheric Sciences Award # 1744835 Antarctic Ocean and Atmospheric Sciences Award # 1744800 AMD - DIF Record(s) USAP-1744835_1 Data Management Plan None in the Database Product Level: NA Datasets Repository Title (link) Format(s) Status USAP-DC Model of iceberg drift and decay including breakup Not Provided exists Publications England, Mark R. and Wagner, Till J. and Eisenman, Ian "Modeling the breakup of tabular icebergs" Science Advances , v.6 , 2020 (doi:https://doi.org/10.1126/sciadv.abd1273) Wagner, T. J. W., Straneo, F., Richards, C. G., Slater, D. A., Stevens, L. A., Das, S. B., & Singh, H. (2019). Large spatial variations in the flux balance along the front of a Greenland tidewater glacier. The Cryosphere, 13(3), 911–925. (doi:10.5194/tc-13-911-2019) Huth, A., Adcroft, A., & Sergienko, O. (2022). Parameterizing Tabular‐Iceberg Decay in an Ocean Model. Journal of Advances in Modeling Earth Systems, 14(3). Portico. (doi:10.1029/2021ms002869) Wagner, T. J. W., Straneo, F., Richards, C. G., Slater, D. A., Stevens, L. A., Das, S. B., & Singh, H. (2018). Large spatial variations in the frontal mass budget of a Greenland tidewater glacier. (doi:10.5194/tc-2018-143) Wagner, T. J. W., Eisenman, I., Ceroli, A. M., & Constantinou, N. C. (2022). How Winds and Ocean Currents Influence the Drift of Floating Objects. Journal of Physical Oceanography, 52(5), 907–916. (doi:10.1175/jpo-d-20-0275.1) Castagno, A. P., Wagner, T. J. W., Cape, M. R., Lester, C. W., Bailey, E., Alves‐de‐Souza, C., York, R. A., & Fleming, A. H. (2023). Increased sea ice melt as a driver of enhanced Arctic phytoplankton blooming. Global Change Biology. Portico. (doi:10.1111/gcb.16815) Keywords Amd/Us ICEBERGS Southern Ocean Platforms and Instruments COMPUTERS