Dowdeswell et al., 2020 Science Supplementary Files.pdf (1.09 MB)

Delicate seafloor landforms reveal past Antarctic grounding-line retreat of kilometers per year

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posted on 22.04.2020, 13:35 by JA Dowdeswell, CL Batchelor, A Montelli, D Ottesen, FDW Christie, EK Dowdeswell, Jeffrey Evans
A suite of grounding-line landforms on the Antarctic seafloor, imaged at unprecedented sub-meter horizontal resolution from an autonomous underwater vehicle, enables calculation of ice-sheet retreat rates from a complex of grounding-zone wedges on the Larsen continental shelf, western Weddell Sea. The landforms are delicate sets of up to 90 ridges, <1.5 m high and spaced 20-25 m apart. We interpret these ridges as the product of squeezing up of soft sediment during the rise and fall of the ice-shelf grounding line during successive tidal cycles. Each ridge is preserved as the grounding line retreats. Grounding-line retreat rates of 40-50 m/day (>10 km/yr) are inferred during regional deglaciation of the Larsen shelf after the Last Glacial Maximum. If repeated today, such rapid mass loss to the ocean would have clear implications for increasing the rate of global sea-level rise.

Funding

Flotilla Foundation and Marine Archaeology Consultants Switzerland.

C.L.B. was in receipt of a grant from the Norwegian VISTA programme.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Science

Volume

368

Issue

6494

Pages

1020 - 1024

Publisher

American Association for the Advancement of Science (AAAS)

Version

AM (Accepted Manuscript)

Rights holder

© The Authors

Publisher statement

This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science Journal 368 (6494), 29 May 2020, doi: 10.1126/science.aaz3059.

Acceptance date

16/04/2020

Publication date

2020-05-29

Copyright date

2020

ISSN

0036-8075

eISSN

1095-9203

Language

en

Depositor

Dr Jeffrey Evans. Deposit date: 20 April 2020

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