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<p>The impacts of boreal Forest Cover Change (FCC) during winter are somewhat neglected due to a lack of evapotranspiration and solar radiation. This study incorporates the observed FCC into the Earth System Model, and the ensemble simulations agree on a significant winter cooling over Eurasia with a land-atmosphere coupled framework caused by a weakening of the stratospheric polar vortex. We find that afforestation in western Europe leads to more snow interception on canopy in November, inhibiting snow accumulation and reducing surface albedo. The stronger snow-albedo feedback as the source of perturbation stimulates upward planetary wave propagations, weakening the stratospheric polar vortex, and forming a negative Arctic Oscillation pattern at the surface. None of the models in the Land Use Model Intercomparison Project can retrieve the Eurasian cooling due to its deforestation scenario. Our findings demonstrate the importance of FCC in modulating winter climate over arctic-boreal regions.</p>

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Boreal forest cover change since 2000 contributes to cold winters in Eurasia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月6日

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  • Lei Cai,
  • Ji Ma,
  • Yaoyin Zhang,
  • Wenwen Shi,
  • Ruowen Yang

摘要

The impacts of boreal Forest Cover Change (FCC) during winter are somewhat neglected due to a lack of evapotranspiration and solar radiation. This study incorporates the observed FCC into the Earth System Model, and the ensemble simulations agree on a significant winter cooling over Eurasia with a land-atmosphere coupled framework caused by a weakening of the stratospheric polar vortex. We find that afforestation in western Europe leads to more snow interception on canopy in November, inhibiting snow accumulation and reducing surface albedo. The stronger snow-albedo feedback as the source of perturbation stimulates upward planetary wave propagations, weakening the stratospheric polar vortex, and forming a negative Arctic Oscillation pattern at the surface. None of the models in the Land Use Model Intercomparison Project can retrieve the Eurasian cooling due to its deforestation scenario. Our findings demonstrate the importance of FCC in modulating winter climate over arctic-boreal regions.