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<p>The collapse of Northern Hemisphere ice sheets has been deemed as a trigger of positive climate feedback during Quaternary glacial terminations. Increasing boreal summer insolation is widely considered the primary driver; however, the precise initiating mechanisms remain elusive. Here we report an unambiguous warming trend in the southern Nordic Seas since the late Last Glacial Maximum, coinciding with the marked increase in 65°N summer insolation, and subsequently followed by a distinct surface cooling linked to intense freshwater discharge. Our reconstructions indicate that the initial collapse during the Last Termination began within the Eurasian Ice Sheet. Increasing boreal insolation weakened the latitudinal insolation gradient and displaced the westerlies northward, promoting poleward oceanic heat transport and ensuing warming in the Nordic Seas. This warming accelerated the disintegration of marine-terminating glaciers of the Eurasian Ice Sheet, leading to a catastrophic meltwater release. The resulting freshwater perturbation contributed to the early weakening of the Atlantic Meridional Overturning Circulation and ultimately triggered the destabilization of the Laurentide Ice Sheet, further accelerating the deglaciation process.</p>

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Insolation-forced oceanic changes triggered the Eurasian Ice Sheet collapse and the Last Termination

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月14日

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  • Dong Wu,
  • Siqi Li,
  • Jón Eiríksson,
  • Esther Ruth Guðmundsdóttir,
  • Yair Rosenthal,
  • Ningjing Hu,
  • Dejiang Fan,
  • Yanguang Liu,
  • Xu Zhang

摘要

The collapse of Northern Hemisphere ice sheets has been deemed as a trigger of positive climate feedback during Quaternary glacial terminations. Increasing boreal summer insolation is widely considered the primary driver; however, the precise initiating mechanisms remain elusive. Here we report an unambiguous warming trend in the southern Nordic Seas since the late Last Glacial Maximum, coinciding with the marked increase in 65°N summer insolation, and subsequently followed by a distinct surface cooling linked to intense freshwater discharge. Our reconstructions indicate that the initial collapse during the Last Termination began within the Eurasian Ice Sheet. Increasing boreal insolation weakened the latitudinal insolation gradient and displaced the westerlies northward, promoting poleward oceanic heat transport and ensuing warming in the Nordic Seas. This warming accelerated the disintegration of marine-terminating glaciers of the Eurasian Ice Sheet, leading to a catastrophic meltwater release. The resulting freshwater perturbation contributed to the early weakening of the Atlantic Meridional Overturning Circulation and ultimately triggered the destabilization of the Laurentide Ice Sheet, further accelerating the deglaciation process.