Scholarlink

<p>Over recent decades, the Arctic has warmed four times faster than the global average, associated with a decline in sea ice and accelerating Greenland Ice Sheet mass loss, which has contributed to episodic freshening of the subpolar North Atlantic. Here, we show that a 0.05 Sv North Atlantic meltwater flux induces &#xa0;~&#xa0;1°C subsurface warming within a decade in Baffin Bay, Hudson Strait, and along Greenland’s southern and western coasts. This warming arises from enhanced stratification, weakened deep convection in the subpolar gyre, and a weaker Labrador Current. Freshening also alters horizontal density gradients, strengthening cyclonic circulation in the Nordic Seas and causing transient regional warming. The temperature response significantly depends on the location of deep-ocean convection, highlighting the need for simulations with accurate deep-ocean convection. This warming may create a positive feedback, accelerating Greenland and Arctic glacier melt with implications for ice-sheet stability and the strength of the Atlantic Meridional Overturning Circulation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Rapid subsurface warming in the subpolar North Atlantic from freshening

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月27日

查看全文
  • Laurie C. Menviel,
  • Gabriel Pontes,
  • Mathieu Lapeze,
  • Himadri Saini

摘要

Over recent decades, the Arctic has warmed four times faster than the global average, associated with a decline in sea ice and accelerating Greenland Ice Sheet mass loss, which has contributed to episodic freshening of the subpolar North Atlantic. Here, we show that a 0.05 Sv North Atlantic meltwater flux induces  ~ 1°C subsurface warming within a decade in Baffin Bay, Hudson Strait, and along Greenland’s southern and western coasts. This warming arises from enhanced stratification, weakened deep convection in the subpolar gyre, and a weaker Labrador Current. Freshening also alters horizontal density gradients, strengthening cyclonic circulation in the Nordic Seas and causing transient regional warming. The temperature response significantly depends on the location of deep-ocean convection, highlighting the need for simulations with accurate deep-ocean convection. This warming may create a positive feedback, accelerating Greenland and Arctic glacier melt with implications for ice-sheet stability and the strength of the Atlantic Meridional Overturning Circulation.