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<p>The rapid transformation of the ocean–atmosphere–cryosphere system during the last deglaciation holds clues that may be useful to understand climate change during this century and beyond. Within this context, sea-level change connects the climate system components, but the limited temporal resolution and spatial distribution of relative sea-level records has hindered progress towards closing the ice sheet–sea-level budget since the Last Glacial Maximum. Here we present a relative sea-level record, compiled using radiocarbon-dated basal peat, from the Mississippi Delta stretching back to ~10,000 years ago and combine it with the best available relative sea-level data worldwide for the final episode of the last deglaciation (9,000–7,000 years ago). Geophysical modelling shows that these precise data constraints favour approximately 14 m of ice melt in North America through this interval, 4–10 m greater than previously estimated, and at least three times greater than the Antarctic contribution. Our results call for a major revision of the GIA-based reconstruction of North American deglaciation, with implications for, among others, collapse of the saddle connecting two ice domes over Hudson Bay, the associated abrupt cooling ~8,200 years ago and the sensitivity of the Atlantic Meridional Overturning Circulation to freshwater forcing.</p>

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Sea-level rise at the end of the last deglaciation dominated by North American ice sheets

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Udita Mukherjee,
  • Lael Vetter,
  • Glenn A. Milne,
  • Lev Tarasov,
  • Elena Steponaitis,
  • Niamh Cahill,
  • Benoit S. Lecavalier,
  • Brad E. Rosenheim,
  • Torbjörn E. Törnqvist

摘要

The rapid transformation of the ocean–atmosphere–cryosphere system during the last deglaciation holds clues that may be useful to understand climate change during this century and beyond. Within this context, sea-level change connects the climate system components, but the limited temporal resolution and spatial distribution of relative sea-level records has hindered progress towards closing the ice sheet–sea-level budget since the Last Glacial Maximum. Here we present a relative sea-level record, compiled using radiocarbon-dated basal peat, from the Mississippi Delta stretching back to ~10,000 years ago and combine it with the best available relative sea-level data worldwide for the final episode of the last deglaciation (9,000–7,000 years ago). Geophysical modelling shows that these precise data constraints favour approximately 14 m of ice melt in North America through this interval, 4–10 m greater than previously estimated, and at least three times greater than the Antarctic contribution. Our results call for a major revision of the GIA-based reconstruction of North American deglaciation, with implications for, among others, collapse of the saddle connecting two ice domes over Hudson Bay, the associated abrupt cooling ~8,200 years ago and the sensitivity of the Atlantic Meridional Overturning Circulation to freshwater forcing.