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<p>The Ross Ice Shelf buttresses ice draining from both East and West Antarctica and its collapse could accelerate the loss of inland ice sheets, rapidly raising sea level. Documenting the location, timing and rate of past glacial retreat can help reveal processes driving rapid mass loss, informing projections of ice sheet responses to a warming climate. Here, we present a record of mid-Holocene ice retreat from the southwestern Ross Sea using facies succession and paired ramped pyrolysis oxidation <sup>14</sup>C/<sup>210</sup>Pb chronology. This record shows rapid ice shelf retreat from 6.9-5.4 cal kyr BP, coeval with thinning of adjacent outlet glaciers. Our findings reconcile earlier discrepancies in terrestrial and marine reconstructions, and indicate that synchronous grounding line retreat from west of Ross Island to the Siple Coast at ~7-6.2 cal kyr BP was likely driven by warm-water incursions, a process active in parts of Antarctica today.</p>

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Synchronous mid-Holocene marine and terrestrial deglaciation in the Ross Sea, Antarctica

  • 期刊论文

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  • 发表日期：

    2025年12月19日

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  • Rebecca L. Parker,
  • Christina R. Riesselman,
  • Olivia J. Truax,
  • Richard S. Jones,
  • Jae Il Lee,
  • Min Kyung Lee,
  • Geraldine Jacobsen,
  • Brad E. Rosenheim,
  • Cristina Subt,
  • Atun Zawadzki,
  • Catherine Ginnane,
  • Sebastian Naeher,
  • Gavin Dunbar,
  • Robert M. McKay,
  • Richard Levy,
  • Jocelyn Turnbull,
  • Kyu-Cheul Yoo

摘要

The Ross Ice Shelf buttresses ice draining from both East and West Antarctica and its collapse could accelerate the loss of inland ice sheets, rapidly raising sea level. Documenting the location, timing and rate of past glacial retreat can help reveal processes driving rapid mass loss, informing projections of ice sheet responses to a warming climate. Here, we present a record of mid-Holocene ice retreat from the southwestern Ross Sea using facies succession and paired ramped pyrolysis oxidation 14C/210Pb chronology. This record shows rapid ice shelf retreat from 6.9-5.4 cal kyr BP, coeval with thinning of adjacent outlet glaciers. Our findings reconcile earlier discrepancies in terrestrial and marine reconstructions, and indicate that synchronous grounding line retreat from west of Ross Island to the Siple Coast at ~7-6.2 cal kyr BP was likely driven by warm-water incursions, a process active in parts of Antarctica today.