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Wåhlin, Anna, Alley, Karen E., Begeman, Carolyn, Hegrenæs, Øyvind, Yuan, Xiaohan, Graham, Alastair G. C., Hogan, Kelly, Davis, Peter E. D., Dotto, Tiago S., Eayrs, Clare, Hall, Robert A. 
ORCID: https://orcid.org/0000-0002-3665-6322, Kim, Tae Wan, Larter, Robert D., Ling, Li, Muto, Atsuhiro, Pettit, Erin C., Schmidt, Britney E., Snow, Tasha, Stedt, Filip, Washam, Peter M., Wahlgren, Stina, Wild, Christian, Wellner, Julia, Zheng, Yixi and Heywood, Karen J. ORCID: https://orcid.org/0000-0001-9859-0026
(2024)
Swirls and scoops: Ice base melt revealed by multibeam imagery of an Antarctic ice shelf.
Science Advances, 10 (31).
ISSN 2375-2548
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Abstract
Knowledge gaps about how the ocean melts Antarctica’s ice shelves, borne from a lack of observations, lead to large uncertainties in sea level predictions. Using high-resolution maps of the underside of Dotson Ice Shelf, West Antarctica, we reveal the imprint that ice shelf basal melting leaves on the ice. Convection and intermittent warm water intrusions form widespread terraced features through slow melting in quiescent areas, while shear-driven turbulence rapidly melts smooth, eroded topographies in outflow areas, as well as enigmatic teardrop-shaped indentations that result from boundary-layer flow rotation. Full-thickness ice fractures, with bases modified by basal melting and convective processes, are observed throughout the area. This new wealth of processes, all active under a single ice shelf, must be considered to accurately predict future Antarctic ice shelf melt.
| Item Type: | Article |
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| Additional Information: | Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Shipboard ADCP data from the RV Nathaniel B. Palmer are available from www.rvdata.us/search/vessel/Palmer. AUV data and CTD data (doi number https://doi.org/10.5878/jej3-kv87) from the hot water drilling are available from the Swedish National Research Data base: https://snd.se/en/catalogue/dataset/2024-143. CTD data from Nathaniel B. Palmer are available from the US Antarctic Program Data Center: https://doi.org/10.15784/601785. Funding information: This work is from the TARSAN, THOR, and MELT projects, components of the International Thwaites Glacier Collaboration (ITGC). The following funding agencies have supported this work: National Science Foundation (NSF; grants 1924730 to E.C.P., 173894 to J.W., and PLR-2151295 to D.M.H.), Natural Environment Research Council (NERC; grants NE/S006419/1 to K.J.H., R.A.H., Y.Z., and T.S.D.; NE/S006664/1 and NE/S006672/1 to R.D.L. and K.J.H.; and NE/S006206/1 to A.G.C.G.), Polar Science for a Sustainable Planet program of British Antarctic Survey to K.H., P.E.D.D., and R.D.L., NASA Cryosphere (80NSSC22K0385 and 80NSSC22K1877) to T.S., NSERC Discovery (RGPIN-2021-02910) to K.E.A., Korea Institute of Marine Science and Technology Promotion (KIMST) grant funded by the Ministry of Oceans and Fisheries (RS-2023-00256677; PM24020) to C.E., Korea Polar Research Institute (KOPRI) under grant funded by the Ministry of Oceans and Fisheries (KOPRI PE24110) to T.W.K., and The Swedish Research Council under grant 2021-03679_VR to A.W. |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA |
| UEA Research Groups: | Faculty of Science > Research Groups > Collaborative Centre for Sustainable Use of the Seas Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 08 Aug 2024 12:30 |
| Last Modified: | 15 Aug 2024 15:30 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/96178 |
| DOI: | 10.1126/sciadv.adn9188 |
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