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<p>Future climate confronts major challenges due to ongoing Arctic sea-ice retreat. Notably, eventful sea-ice loss in the Holocene appears comparable circumstance, but associated physics remians poorly understood. Here we present a high-resolution and semi-quantitative reconstruction of sea-ice conditions over the East Siberian Arctic Shelf. A compilation of sea-ice reconstructions across the circum-Arctic characterizes a Pacific-side Arctic sea-ice melting event between 4.5 and 2.2 ka BP. Together with basin-wide paleoclimate records, satellite-derived and numerical modeling datasets, we attribute this sea-ice melting event to enhanced Bering Sea Inflow with stronger poleward transport of Pacific oceanic heat, which overcame long-term Holocene cooling trend likely linked to concurrently slowing Atlantic Meridional Overturning Circulation. Such Holocene-scale competition effect of ‘Pacificization <i>v.s</i>. Atlantification’ may conceptually explain the modern dipole pattern in Arctic sea-ice variation. In the warming future, projected more frequent La Niña circumstance could indicate enhanced Pacificization effect, leading to aggravated Pacific-side Arctic sea-ice retreat.</p>

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Enhanced Arctic sea-ice retreat due to pronounced pacificization effect in the Holocene

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月22日

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  • Yuying Zhang,
  • Limin Hu,
  • Xun Gong,
  • Xiaotong Xiao,
  • Zhizheng Jia,
  • Yanguang Liu,
  • Jiang Dong,
  • Anatolii S. Astakhov,
  • Alexander Bosin,
  • Yuri Vasilenko,
  • Meixun Zhao,
  • Ruediger Stein,
  • Gerrit Lohmann,
  • Xuefa Shi

摘要

Future climate confronts major challenges due to ongoing Arctic sea-ice retreat. Notably, eventful sea-ice loss in the Holocene appears comparable circumstance, but associated physics remians poorly understood. Here we present a high-resolution and semi-quantitative reconstruction of sea-ice conditions over the East Siberian Arctic Shelf. A compilation of sea-ice reconstructions across the circum-Arctic characterizes a Pacific-side Arctic sea-ice melting event between 4.5 and 2.2 ka BP. Together with basin-wide paleoclimate records, satellite-derived and numerical modeling datasets, we attribute this sea-ice melting event to enhanced Bering Sea Inflow with stronger poleward transport of Pacific oceanic heat, which overcame long-term Holocene cooling trend likely linked to concurrently slowing Atlantic Meridional Overturning Circulation. Such Holocene-scale competition effect of ‘Pacificization v.s. Atlantification’ may conceptually explain the modern dipole pattern in Arctic sea-ice variation. In the warming future, projected more frequent La Niña circumstance could indicate enhanced Pacificization effect, leading to aggravated Pacific-side Arctic sea-ice retreat.