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<p>This study investigates the influence of the North Atlantic Tripole (NAT) on the Circum-Hemisphere Teleconnection (CHT) during boreal winter, using diagnostic analysis and model simulation. The CHT, recently identified by Wang et al. (Clim Dyn 63(1):30, 2024. <a href="https://doi.org/10.1007/s00382-024-07486-7">https://doi.org/10.1007/s00382-024-07486-7</a>), is characterized by five distinct centers of action in the Central North Atlantic, Greenland, Western Europe, Caspian Sea, and Far East. Notably, this teleconnection pattern exhibits significant interannual (~ 3a) and decadal (~10a) variabilities. Regional climate variations are strongly correlated with the CHT along its path, spanning the North America, North Atlantic, and Eurasia. Moreover, this influence of the CHT on regional surface air temperature and cold nights is primarily explained through its modulation of atmospheric thickness. Additionally, the NAT excites the CHT primarily via diabatic heating and baroclinic instability, two mechanisms of midlatitude air–sea interactions. Specifically, during the negative phase of NAT, cooling sea surface temperature (SST) in the midlatitude and warming SST in the tropical North Atlantic strengthen oceanic fronts in the subtropical North Atlantic. This strengthening enhances atmospheric baroclinicity, strengthens storm tracks, and promotes localized precipitation increases. Both the latent heat released from this precipitation and baroclinic instability subsequently excite the CHT, enabling the propagation of atmospheric signals from the North Atlantic to Eurasia with a characteristic timescale of approximately one month. These findings are robustly supported by the methods of stationary wave ray tracing in non-uniform horizontal basic flow, wave activity flux calculations, and numerical models.</p>

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Influence of the North Atlantic Tripole on the circum-hemisphere teleconnection in boreal winter

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Ning Wang,
  • Jianping Li,
  • Hao Wang,
  • Hao Li,
  • Zixiang Wu,
  • Yue Sun

摘要

This study investigates the influence of the North Atlantic Tripole (NAT) on the Circum-Hemisphere Teleconnection (CHT) during boreal winter, using diagnostic analysis and model simulation. The CHT, recently identified by Wang et al. (Clim Dyn 63(1):30, 2024. https://doi.org/10.1007/s00382-024-07486-7), is characterized by five distinct centers of action in the Central North Atlantic, Greenland, Western Europe, Caspian Sea, and Far East. Notably, this teleconnection pattern exhibits significant interannual (~ 3a) and decadal (~10a) variabilities. Regional climate variations are strongly correlated with the CHT along its path, spanning the North America, North Atlantic, and Eurasia. Moreover, this influence of the CHT on regional surface air temperature and cold nights is primarily explained through its modulation of atmospheric thickness. Additionally, the NAT excites the CHT primarily via diabatic heating and baroclinic instability, two mechanisms of midlatitude air–sea interactions. Specifically, during the negative phase of NAT, cooling sea surface temperature (SST) in the midlatitude and warming SST in the tropical North Atlantic strengthen oceanic fronts in the subtropical North Atlantic. This strengthening enhances atmospheric baroclinicity, strengthens storm tracks, and promotes localized precipitation increases. Both the latent heat released from this precipitation and baroclinic instability subsequently excite the CHT, enabling the propagation of atmospheric signals from the North Atlantic to Eurasia with a characteristic timescale of approximately one month. These findings are robustly supported by the methods of stationary wave ray tracing in non-uniform horizontal basic flow, wave activity flux calculations, and numerical models.