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<p>Millennial-scale climate variability in polar ice cores exhibits interhemispheric temperature asynchronicity during the last glacial period, approximately 70,000 to 15,000 years ago. This bipolar seesaw pattern is most pronounced during Heinrich Stadials, which correspond to recurring severe cooling episodes in the North Atlantic region following a weakening of the Atlantic overturning circulation. However, mid-latitude ice sheets and glaciers displayed similar fluctuations in both hemispheres during the most recent Heinrich Stadials, complicating our understanding of interhemispheric teleconnections. Here we provide a continuous millennial-scale record of New Zealand glacier fluctuations over the last glacial period, through the analysis of glaciogenic sediments deposited offshore South Island. We find that millennial-scale glacial retreats in New Zealand occurred during Heinrich Stadials, coinciding with a southerly shift of the South Pacific Subtropical Front inferred from planktic foraminiferal assemblages, and were probably—if not very probably—synchronous (within 1–2 kyr) with enhanced meltwater and iceberg production from the North American and European ice sheets. These findings demonstrate that global retreat of mid-latitude ice masses is a persistent feature of Heinrich Stadials, possibly driven by global energy gain and sustained in the Southern Hemisphere by heat accumulation resulting from the weak Atlantic overturning circulation.</p>

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Synchronous bipolar retreat of mid-latitude ice masses during Heinrich Stadials

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Samuel Toucanne,
  • Natalia Vázquez Riveiros,
  • Guillaume Soulet,
  • Pierre-Henri Blard,
  • Amandine Migeon,
  • Vincent Rigalleau,
  • Angelique Roubi,
  • Sandrine Cheron,
  • Audrey Boissier,
  • Laurie Menviel,
  • Helen Bostock

摘要

Millennial-scale climate variability in polar ice cores exhibits interhemispheric temperature asynchronicity during the last glacial period, approximately 70,000 to 15,000 years ago. This bipolar seesaw pattern is most pronounced during Heinrich Stadials, which correspond to recurring severe cooling episodes in the North Atlantic region following a weakening of the Atlantic overturning circulation. However, mid-latitude ice sheets and glaciers displayed similar fluctuations in both hemispheres during the most recent Heinrich Stadials, complicating our understanding of interhemispheric teleconnections. Here we provide a continuous millennial-scale record of New Zealand glacier fluctuations over the last glacial period, through the analysis of glaciogenic sediments deposited offshore South Island. We find that millennial-scale glacial retreats in New Zealand occurred during Heinrich Stadials, coinciding with a southerly shift of the South Pacific Subtropical Front inferred from planktic foraminiferal assemblages, and were probably—if not very probably—synchronous (within 1–2 kyr) with enhanced meltwater and iceberg production from the North American and European ice sheets. These findings demonstrate that global retreat of mid-latitude ice masses is a persistent feature of Heinrich Stadials, possibly driven by global energy gain and sustained in the Southern Hemisphere by heat accumulation resulting from the weak Atlantic overturning circulation.