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Article Dans Une Revue Nature Communications Année : 2022

Biophysical impacts of northern vegetation changes on seasonal warming patterns

Xu Lian
  • Fonction : Auteur
Sujong Jeong
  • Fonction : Auteur
Chang-Eui Park
  • Fonction : Auteur
Hao Xu
  • Fonction : Auteur
Tao Wang
  • Fonction : Auteur
Pierre Gentine
  • Fonction : Auteur
Josep Peñuelas
  • Fonction : Auteur
Shilong Piao
  • Fonction : Auteur

Résumé

The seasonal greening of Northern Hemisphere (NH) ecosystems, due to extended growing periods and enhanced photosynthetic activity, could modify near-surface warming by perturbing land-atmosphere energy exchanges, yet this biophysical control on warming seasonality is underexplored. By performing experiments with a coupled land-atmosphere model, here we show that summer greening effectively dampens NH warming by −0.15 ± 0.03 °C for 1982-2014 due to enhanced evapotranspiration. However, greening generates weak temperature changes in spring (+0.02 ± 0.06 °C) and autumn (−0.05 ± 0.05 °C), because the evaporative cooling is counterbalanced by radiative warming from albedo and water vapor feedbacks. The dwindling evaporative cooling towards cool seasons is also supported by state-of-the-art Earth system models. Moreover, greening-triggered energy imbalance is propagated forward by atmospheric circulation to subsequent seasons and causes sizable time-lagged climate effects. Overall, greening makes winter warmer and summer cooler, attenuating the seasonal amplitude of NH temperature. These findings demonstrate complex tradeoffs and linkages of vegetation-climate feedbacks among seasons.
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insu-03847110 , version 1 (11-11-2022)

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Xu Lian, Sujong Jeong, Chang-Eui Park, Hao Xu, Laurent Z. X. Li, et al.. Biophysical impacts of northern vegetation changes on seasonal warming patterns. Nature Communications, 2022, 13, ⟨10.1038/s41467-022-31671-z⟩. ⟨insu-03847110⟩
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