Reconstructing the Last Glacial Maximum ice sheet in the Weddell Sea embayment,Antarctica, using numerical modelling constrained by field evidence |
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| Authors: | A.M. Le Brocq M.J. Bentley A. Hubbard C.J. Fogwill D.E. Sugden P.L. Whitehouse |
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| Affiliation: | 1. Geography, College of Life and Environmental Sciences, University of Exeter, Amory Building, Rennes Drive, Exeter EX4 4RJ, UK;2. Department of Geography, University of Durham, Science Laboratories, South Road, Durham DH1 3LE, UK;3. Institute of Geography & Earth Sciences, Aberystwyth University, Llandinam Building, Penglais Campus, Aberystwyth, SY23 3DB Wales, UK;4. School of GeoSciences, University of Edinburgh, Drummond St, Edinburgh EH8 9XP, UK;5. Climate Change Research Centre (CCRC), School of Biology, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales, Australia;1. Institute of Marine Biochemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, Hanoi, Viet Nam;2. G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, Prospect 100-let Vladivostoku 159, Vladivostok 690022, Russia;3. Far Eastern Federal University, Suhanova st. 8, Vladivostok 690950, Russia;1. Korea Institute for Advanced Study (KIAS), Quantum Universe Center (QUC), 85 Hoegiro, Dongdaemun-gu, Seoul, South Korea;2. Department of Physics, National Taiwan Normal University, No. 88, Sec. 4, Ting-Chou Road, Taipei 11677, Taiwan;1. Research Center for Marine Drugs and Department of Pharmacology, School of Pharmacy, Second Military Medical University, 325 Guo-He Road, Shanghai 200433, PR China;2. The Environment and Plant Protection College of Hainan University, 58 Ren-Min Road, Haikou 570228, PR China;1. Marine Biophysics Unit, Okinawa Institute of Science and Technology, Onna, Okinawa 904-0412, Japan;2. Department of Zoology, University of Oxford, Oxford OX1 3PS, United Kingdom |
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| Abstract: | The Weddell Sea Embayment (WSE) sector of the Antarctic ice sheet has been suggested as a potential source for a period of rapid sea-level rise – Meltwater Pulse 1a, a 20 m rise in ～500 years. Previous modelling attempts have predicted an extensive grounding line advance in the WSE, to the continental shelf break, leading to a large equivalent sea-level contribution for the sector. A range of recent field evidence suggests that the ice sheet elevation change in the WSE at the Last Glacial Maximum (LGM) is less than previously thought. This paper describes and discusses an ice flow modelling derived reconstruction of the LGM ice sheet in the WSE, constrained by the recent field evidence. The ice flow model reconstructions suggest that an ice sheet consistent with the field evidence does not support grounding line advance to the continental shelf break. A range of modelled ice sheet surfaces are instead produced, with different grounding line locations derived from a novel grounding line advance scheme. The ice sheet reconstructions which best fit the field constraints lead to a range of equivalent eustatic sea-level estimates between approximately 1.4 and 3 m for this sector. This paper describes the modelling procedure in detail, considers the assumptions and limitations associated with the modelling approach, and how the uncertainty may impact on the eustatic sea-level equivalent results for the WSE. |
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