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<p>Glacial terminations stand out for their high rates of sea-level rise, particularly during meltwater pulses. Termination IV (T-IV; ~340,000 years before present) is a prominent example, with sea level rising at up to ~5 m per century. Due to sparse absolute age constraints on marine records, the causes for the high rates of sea-level rise at T-IV remain elusive. In this work, we provide a speleothem chronology from northern Italy, which we transpose to North Atlantic marine records. We infer that the high T-IV sea-level rise rate likely relates to a feedback whereby protracted meltwater release caused enhanced ocean heat storage, followed by heat release upon circulation recovery, driving additional ice-sheet collapse. This analysis highlights the critical role of oceanic feedbacks in driving exceptional rates of sea-level rise during terminations.</p>

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Protracted ocean circulation slowdown drove exceptional ice-sheet melting during ice age termination IV

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月16日

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  • Hsun-Ming Hu,
  • Gianluca Marino,
  • María Fernanda Sánchez Goñi,
  • Eelco Rohling,
  • Teresa Rodrigues,
  • Carlos Pérez-Mejías,
  • Qiuping Ren,
  • Xiuyang Jiang,
  • Véronique Michel,
  • Patricia Valensi,
  • Elisabetta Starnini,
  • Marta Zunino,
  • J. Sakari Salonen,
  • Chieh-Ju Hsieh,
  • Liangcheng Tan,
  • Baptiste Chaigneau,
  • Maud Chevalier,
  • Chuan-Chou Shen

摘要

Glacial terminations stand out for their high rates of sea-level rise, particularly during meltwater pulses. Termination IV (T-IV; ~340,000 years before present) is a prominent example, with sea level rising at up to ~5 m per century. Due to sparse absolute age constraints on marine records, the causes for the high rates of sea-level rise at T-IV remain elusive. In this work, we provide a speleothem chronology from northern Italy, which we transpose to North Atlantic marine records. We infer that the high T-IV sea-level rise rate likely relates to a feedback whereby protracted meltwater release caused enhanced ocean heat storage, followed by heat release upon circulation recovery, driving additional ice-sheet collapse. This analysis highlights the critical role of oceanic feedbacks in driving exceptional rates of sea-level rise during terminations.