Ice-sheet expansion from the Ross Sea into McMurdo Sound, Antarctica, during the last two glaciations

Heath, Stephanie; Hall, Brenda L.; Denton, George H.; Henderson, Gideon M.; Hendy, Chris H.

doi:10.1016/j.quascirev.2022.107379

Cited by 5 publications

(1 citation statement)

References 61 publications

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“…However, it is important to note that it is hard to distinguish these WRS sources from the WAS/ EAS sources. The glaciers in the Dry Valleys/North Victoria Land regions would have been advanced into the Ross Sea Embayment in the form of outlet glaciers during glacial periods (Heath et al, 2022), while their retreat during warm periods could supply such glacial drift via calving icebergs. Overall, the consistent Sr-Nd isotope signatures since MIS 16 implicate a mixture of terrigenous detritus supplied predominantly by icebergs from the Amundsen and Bellingshausen Seas and from the Dry Valleys/North Victoria Land (WRS) that probably drifted through modern-like iceberg trajectories to our site (Figures 1c and 7a).…”

Section: Clay Mineral Provenance Changes Driven By Ocean Current Stre...mentioning

confidence: 99%

Ocean‐Forced Instability of the West Antarctic Ice Sheet Since the Mid‐Pleistocene

Wang

Tang

Wilson

et al. 2022

Geochem Geophys Geosyst

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Evidence on West Antarctic Ice Sheet (WAIS) instability through Pleistocene glacial/interglacial cycles can provide fundamental constraints on interactions between the climate system and cryosphere. To explore such ice sheet‐ocean‐climate processes on orbital timescales over the last ∼770 ka, we provide continuous records of iceberg‐rafted debris (IRD) content and clay mineralogy, supported by detrital Sr‐Nd isotopes from the pronounced IRD peaks, in gravity core ANT34/A2‐10 from the Amundsen abyssal plain. The IRD record reveals interglacial WAIS instability since ∼770 ka, while comparison to the clay mineralogy record and published records of regional oceanic and atmospheric forcing suggests a temporal link with a strengthened Antarctic Circumpolar Current, enhanced deepwater ventilation, and poleward‐shifted southern westerly winds. In addition, the Sr‐Nd isotope signature of the detrital sediments indicates a shift in provenance around Marine Isotope Stage (MIS) 16, potentially linked to regional oceanic circulation changes. We suggest that an expanded Ross Gyre was important for controlling iceberg trajectories and sediment transport to the site before MIS 16, whereas modern‐like iceberg trajectories were established after MIS 16, probably related to a poleward shift of the Amundsen Sea Low after the end of the Mid‐Pleistocene Transition. This reorganization of the ocean and atmospheric circulation was followed by an interval of enhanced WAIS variability during MIS 15 to 13, which was linked to strong orbital and ocean forcing. These insights into the role of ocean‐atmosphere forcing on the past behavior of the WAIS may improve our framework for understanding future changes in this region.

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Section: Clay Mineral Provenance Changes Driven By Ocean Current Stre...mentioning

confidence: 99%

Ocean‐Forced Instability of the West Antarctic Ice Sheet Since the Mid‐Pleistocene

Wang

Tang

Wilson

et al. 2022

Geochem Geophys Geosyst

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Glacial history of Pyramid Trough, southern McMurdo Sound, Antarctica: Constraints on Koettlitz Glacier during the last glacial maximum and termination

Walther

Hall

Denton

et al. 2023

Quaternary Science Advances

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Interactions between local glaciers and adjacent grounded Ross Sea ice in the Royal Society Range, Antarctica

Miles,

Hall,

Denton

2024

Quaternary Science Reviews

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Ice-sheet expansion from the Ross Sea into McMurdo Sound, Antarctica, during the last two glaciations

Cited by 5 publications

References 61 publications

Ocean‐Forced Instability of the West Antarctic Ice Sheet Since the Mid‐Pleistocene

Ocean‐Forced Instability of the West Antarctic Ice Sheet Since the Mid‐Pleistocene

Glacial history of Pyramid Trough, southern McMurdo Sound, Antarctica: Constraints on Koettlitz Glacier during the last glacial maximum and termination

Interactions between local glaciers and adjacent grounded Ross Sea ice in the Royal Society Range, Antarctica

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