The discovery of the southernmost ultra-high-resolution Holocene paleoclimate sedimentary record in Antarctica

The response of the Antarctic ice sheet to climate warming is the main source of uncertainty regarding future global sea level rise, since little is known about its present and past dynamics. The last deglaciation is the most recent interval of large-scale climate warming, during which the Northern...

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Bibliographic Details
Published in:Marine Geology
Main Authors: Battaglia F., De Santis L., Baradello L., Colizza E., Rebesco M., Kovacevic V., Ursella L., Bensi M., Accettella D., Morelli D., Corradi N., Falco P., Krauzig N., Colleoni F., Gordini E., Caburlotto A., Langone L., Finocchiaro F.
Other Authors: Battaglia, F., De Santis, L., Baradello, L., Colizza, E., Rebesco, M., Kovacevic, V., Ursella, L., Bensi, M., Accettella, D., Morelli, D., Corradi, N., Falco, P., Krauzig, N., Colleoni, F., Gordini, E., Caburlotto, A., Langone, L., Finocchiaro, F.
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2024
Subjects:
Antarctica
Bottom current
Fjord
Glacier
Ross Sea
Sediment drift
Antarctic
The Antarctic
Victoria Land
Edisto
Edisto Inlet
Antarc*
Ice Sheet
Online Access:https://hdl.handle.net/11567/1157475
https://doi.org/10.1016/j.margeo.2023.107189
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Summary:The response of the Antarctic ice sheet to climate warming is the main source of uncertainty regarding future global sea level rise, since little is known about its present and past dynamics. The last deglaciation is the most recent interval of large-scale climate warming, during which the Northern and Southern Hemisphere ice sheets retreated, and sea level rose globally, although at a non-uniform rate. Geologic records from the polar regions are fundamental in determining the factors that caused the major changes in ice sheets during the last deglacial under different boundary conditions. Here, we combine morpho-bathymetric and seismic data with sediment cores and oceanographic measurements to reconstruct the processes that influenced the deposition of the southernmost, most extensive, ultrahigh-resolution record of the Holocene in Edisto Inlet fjord (Ross Sea, Antarctica). We find that post-glacial sedimentation resulted in a layered diatom mud up to 110 m thick that was locally redistributed by bottom currents over confined drifts-moats in the central part of the fjord. After the Holocene climatic optimum, the fjord was not carved by ground ice, and there continued to be internal fjord water circulation associated with Ross Sea circulation. These results support a retreat of coastal glaciers by about 11 kiloyears ago (ka) from the continental shelf of North Victoria Land. © 2023

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