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In Vincennes Bay, East Antarctica, a seafloor sediment wedge records a surprising sequence: the ice sheet’s grounding zone stabilized during retreat, shifted seaward about 65 kilometers (40 miles), then retreated permanently. The finding shows that retreat can pause or reverse locally, with seafloor shape and sediment deposition influencing stability alongside climate-related forces.
What the seafloor record shows
A grounding zone is the boundary where ice resting on the seafloor transitions into a floating ice shelf. In Vincennes Bay, a large sediment body called a grounding-zone wedge marks a place where the retreating grounding zone halted and stabilized. High-resolution geophysical surveys revealed the wedge’s internal structure, according to the Alfred Wegener Institute’s announcement of the study.
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The wedge is reported as approximately 260 meters high and 65 kilometers long, with a volume greater than 580 cubic kilometers. These are figures reported by the Alfred Wegener Institute, not independently recalculated measurements; the announcement does not provide numerical uncertainty.
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The geological reconstruction describes three stages: the grounding zone retreated, remained locally stable, and then moved seaward by about 65 kilometers (roughly 40 miles) before retreating permanently. Sediment accumulation helped form the wedge during this interval. The evidence therefore records a temporary advance within a broader history of retreat, not a lasting reversal of the ice sheet’s retreat.
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Why sediments and seafloor shape matter
Ice-sheet stability is affected by external conditions such as ocean temperature and sea level, but the study’s interpretation of this record also points to local seafloor form and composition. Sediment deposition can change the substrate beneath the grounding zone, potentially helping it remain stable or shift seaward. These influences are complementary: the finding does not suggest that local sediments make climate or ocean forcing unimportant.
As Chiara Tobisch, the study’s first author and a doctoral researcher in Marine Geophysics and Hydroacoustics at Kiel University, put it: “We can clearly see that an ice sheet does not simply retreat uniformly across all bays. Depending on the characteristics of the substrate, the grounding zone can remain locally stable over long periods of time and may even shift seaward again due to sediment deposition.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the finding does—and does not—tell us
The research, led by Kiel University and the Alfred Wegener Institute and reported in Geophysical Research Letters, adds geological evidence that can help constrain ice-sheet models. It documents a past sequence in Vincennes Bay; it is not a measurement of current ice loss or a forecast of future retreat, and it does not establish that the same pattern occurred across every East Antarctic coastal sector.
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