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<p>High Mountain Asia is a global warming hotspot, yet its influence on Northern Hemisphere extreme weather-related synoptic temperature variability remains unclear. Combining observations and numerical model simulations, we show that amplified High Mountain Asia warming has substantially enhanced summer synoptic temperature variability (&gt;21%) in Canada and Russia while reducing winter variability (&gt;19%) in Eastern Europe and the Nordic Seas during 1940–2022. These changes are primarily driven by altered high-frequency temperature advection. High Mountain Asia warming modifies horizontal temperature gradients, strengthening them in Canada and Russia in summer but weakening them in the Nordic Seas and Eastern Europe in winter. These patterns arise from hemispheric teleconnections that redistribute temperature and modulate atmospheric circulation stability via changes in jet streams, Rossby waves, and air-sea interactions. Our findings highlight High Mountain Asia warming’s far-reaching impacts on Northern Hemisphere weather variability, extending beyond its well-known local climate effects.</p><p></p>

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Changing Northern Hemisphere weather linked to warming amplification in High Mountain Asia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月19日

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  • Yongkun Xie,
  • Jianping Huang,
  • Guoxiong Wu,
  • Jiaqin Mi,
  • Yimin Liu,
  • Zifan Su,
  • Yuzhi Liu,
  • Xiaodan Guan

摘要

High Mountain Asia is a global warming hotspot, yet its influence on Northern Hemisphere extreme weather-related synoptic temperature variability remains unclear. Combining observations and numerical model simulations, we show that amplified High Mountain Asia warming has substantially enhanced summer synoptic temperature variability (>21%) in Canada and Russia while reducing winter variability (>19%) in Eastern Europe and the Nordic Seas during 1940–2022. These changes are primarily driven by altered high-frequency temperature advection. High Mountain Asia warming modifies horizontal temperature gradients, strengthening them in Canada and Russia in summer but weakening them in the Nordic Seas and Eastern Europe in winter. These patterns arise from hemispheric teleconnections that redistribute temperature and modulate atmospheric circulation stability via changes in jet streams, Rossby waves, and air-sea interactions. Our findings highlight High Mountain Asia warming’s far-reaching impacts on Northern Hemisphere weather variability, extending beyond its well-known local climate effects.