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Oceanic forcing of penultimate deglacial and last interglacial sea-level rise

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Listed:
  • Peter U. Clark

    (Oregon State University
    University of Ulster)

  • Feng He

    (University of Wisconsin–Madison)

  • Nicholas R. Golledge

    (Victoria University of Wellington
    GNS Science)

  • Jerry X. Mitrovica

    (Harvard University)

  • Andrea Dutton

    (University of Florida
    University of Wisconsin)

  • Jeremy S. Hoffman

    (Science Museum of Virginia)

  • Sarah Dendy

    (University of Illinois)

Abstract

Sea-level histories during the two most recent deglacial–interglacial intervals show substantial differences1–3 despite both periods undergoing similar changes in global mean temperature4,5 and forcing from greenhouse gases6. Although the last interglaciation (LIG) experienced stronger boreal summer insolation forcing than the present interglaciation7, understanding why LIG global mean sea level may have been six to nine metres higher than today has proven particularly challenging2. Extensive areas of polar ice sheets were grounded below sea level during both glacial and interglacial periods, with grounding lines and fringing ice shelves extending onto continental shelves8. This suggests that oceanic forcing by subsurface warming may also have contributed to ice-sheet loss9–12 analogous to ongoing changes in the Antarctic13,14 and Greenland15 ice sheets. Such forcing would have been especially effective during glacial periods, when the Atlantic Meridional Overturning Circulation (AMOC) experienced large variations on millennial timescales16, with a reduction of the AMOC causing subsurface warming throughout much of the Atlantic basin9,12,17. Here we show that greater subsurface warming induced by the longer period of reduced AMOC during the penultimate deglaciation can explain the more-rapid sea-level rise compared with the last deglaciation. This greater forcing also contributed to excess loss from the Greenland and Antarctic ice sheets during the LIG, causing global mean sea level to rise at least four metres above modern levels. When accounting for the combined influences of penultimate and LIG deglaciation on glacial isostatic adjustment, this excess loss of polar ice during the LIG can explain much of the relative sea level recorded by fossil coral reefs and speleothems at intermediate- and far-field sites.

Suggested Citation

  • Peter U. Clark & Feng He & Nicholas R. Golledge & Jerry X. Mitrovica & Andrea Dutton & Jeremy S. Hoffman & Sarah Dendy, 2020. "Oceanic forcing of penultimate deglacial and last interglacial sea-level rise," Nature, Nature, vol. 577(7792), pages 660-664, January.
  • Handle: RePEc:nat:nature:v:577:y:2020:i:7792:d:10.1038_s41586-020-1931-7
    DOI: 10.1038/s41586-020-1931-7
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    Cited by:

    1. Nicholas R. Golledge, 2020. "Long‐term projections of sea‐level rise from ice sheets," Wiley Interdisciplinary Reviews: Climate Change, John Wiley & Sons, vol. 11(2), March.
    2. David K. Hutchinson & Laurie Menviel & Katrin J. Meissner & Andrew McC. Hogg, 2024. "East Antarctic warming forced by ice loss during the Last Interglacial," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    3. Daniel P. Lowry & Holly K. Han & Nicholas R. Golledge & Natalya Gomez & Katelyn M. Johnson & Robert M. McKay, 2024. "Ocean cavity regime shift reversed West Antarctic grounding line retreat in the late Holocene," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    4. Heather M. Stoll & Isabel Cacho & Edward Gasson & Jakub Sliwinski & Oliver Kost & Ana Moreno & Miguel Iglesias & Judit Torner & Carlos Perez-Mejias & Negar Haghipour & Hai Cheng & R. Lawrence Edwards, 2022. "Rapid northern hemisphere ice sheet melting during the penultimate deglaciation," Nature Communications, Nature, vol. 13(1), pages 1-16, December.

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