Scholarlink

<p>The Atlantic multidecadal variability (AMV) is a basin-scale mode of sea surface temperature (SST) variability in the North Atlantic, exerting a global impact, including contribution to the multidecadal Sahel drought and subsequent recovery and the post-1998 global warming hiatus. How greenhouse warming affects AMV remains unclear. Here, using models with multicentury-long outputs of future climate, we find an intensified AMV under greenhouse warming. Surface warming and freshwater input from sea-ice melt increase surface buoyancy, leading to a slowdown of the Atlantic meridional overturning circulation (AMOC). Reduced vertical mixing associated with suppressed oceanic deep convection results in a thinned mixed layer and its variability, favouring stronger AMV SST variability. Further, a weakened AMOC and the associated northward heat transport prolong the lifespan of the AMV, providing a long time for the AMV to grow. Thus, multidecadal global surface fluctuations and the associated climate extremes are likely to be more intense.</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

Intensified Atlantic multidecadal variability in a warming climate

  • 期刊论文

  • 发表日期：

    2025年2月13日

查看全文
  • Shujun Li,
  • Lixin Wu,
  • Yiting Wang,
  • Tao Geng,
  • Wenju Cai,
  • Bolan Gan,
  • Zhao Jing,
  • Yun Yang

摘要

The Atlantic multidecadal variability (AMV) is a basin-scale mode of sea surface temperature (SST) variability in the North Atlantic, exerting a global impact, including contribution to the multidecadal Sahel drought and subsequent recovery and the post-1998 global warming hiatus. How greenhouse warming affects AMV remains unclear. Here, using models with multicentury-long outputs of future climate, we find an intensified AMV under greenhouse warming. Surface warming and freshwater input from sea-ice melt increase surface buoyancy, leading to a slowdown of the Atlantic meridional overturning circulation (AMOC). Reduced vertical mixing associated with suppressed oceanic deep convection results in a thinned mixed layer and its variability, favouring stronger AMV SST variability. Further, a weakened AMOC and the associated northward heat transport prolong the lifespan of the AMV, providing a long time for the AMV to grow. Thus, multidecadal global surface fluctuations and the associated climate extremes are likely to be more intense.