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<p>The remote influences of springtime Third Pole (TP) snow cover (TPSC) on the Indian Summer Monsoon (ISM) and the East Asian Summer Monsoon (EASM) have been extensively studied. However, a clear mechanism explaining the cross-season links remains not well established. Before we confirm any remote effects, it is essential to first verify local influences. Here, we bear out the enduring local impact of the springtime TPSC according to a numerical experiment together with an observational investigation. By examining the evolution of underlying heat sources, we propose a <b>self-sustaining mechanism</b> elucidating the enduring local impact: considering the case of the springtime TPSC deficit, the excessive precipitation that initially responds to the enhanced surface heat and water fluxes releases extra atmospheric latent heat, which in turn drives an anomalous circulation favoring the next-coming precipitation. This finding adds credit to the cross-season influences of the springtime TPSC remotely on the ISM and the EASM. Furthermore, our work implicates that the TP may get more summer precipitation in a warmer future since there will be an inevitable decrease in springtime TPSC.</p>

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Enduring local impact of springtime snow cover over the Third Pole

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月11日

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  • Changgui Lin,
  • Kun Yang,
  • Deliang Chen,
  • Siyu Yue,
  • Xu Zhou,
  • Yonghui Lei,
  • Jinmei Pan,
  • Xi Cao,
  • Yongkang Xue,
  • Jiancheng Shi

摘要

The remote influences of springtime Third Pole (TP) snow cover (TPSC) on the Indian Summer Monsoon (ISM) and the East Asian Summer Monsoon (EASM) have been extensively studied. However, a clear mechanism explaining the cross-season links remains not well established. Before we confirm any remote effects, it is essential to first verify local influences. Here, we bear out the enduring local impact of the springtime TPSC according to a numerical experiment together with an observational investigation. By examining the evolution of underlying heat sources, we propose a self-sustaining mechanism elucidating the enduring local impact: considering the case of the springtime TPSC deficit, the excessive precipitation that initially responds to the enhanced surface heat and water fluxes releases extra atmospheric latent heat, which in turn drives an anomalous circulation favoring the next-coming precipitation. This finding adds credit to the cross-season influences of the springtime TPSC remotely on the ISM and the EASM. Furthermore, our work implicates that the TP may get more summer precipitation in a warmer future since there will be an inevitable decrease in springtime TPSC.