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

A rapid retreat Are the rates at which we observe ice shelves shrinking today representative of how fast they shrank in the past? Dowdeswell et al. report observations of the Antarctic seafloor that reveal the presence of submarine grounding-zone wedges on the Larsen continental shelf (see the Persp...

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Bibliographic Details
Published in:Science
Main Authors: Dowdeswell, J. A., Batchelor, C. L., Montelli, A., Ottesen, D., Christie, F. D. W., Dowdeswell, E. K., Evans, J.
Other Authors: The Flotilla Foundation, Marine Archaeology Consultants Switzerland
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 2020
Subjects:
Antarc*
Antarctic
Ice Shelf
Ice Shelves
Online Access:http://dx.doi.org/10.1126/science.aaz3059
https://syndication.highwire.org/content/doi/10.1126/science.aaz3059
https://www.science.org/doi/pdf/10.1126/science.aaz3059
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Summary:A rapid retreat Are the rates at which we observe ice shelves shrinking today representative of how fast they shrank in the past? Dowdeswell et al. report observations of the Antarctic seafloor that reveal the presence of submarine grounding-zone wedges on the Larsen continental shelf (see the Perspective by Jakobsson). The authors interpret these ridges as being caused by the tidal rise and fall of the ice shelf at the grounding line, which squeezes the underlying sediments when it rests on the seafloor. From this, they calculated that ice shelf retreat at this location about 14,000 years ago was at times as much as 100 times as fast as the average over the past 10,000 years. Science , this issue p. 1020 see also p. 939

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