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Biophysical impacts of northern vegetation changes on seasonal warming patterns

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Issue Date
2022-07
Publisher
Nature Publishing Group
Citation
Nature Communications, Vol.13 No.1, p. 3925
Abstract
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 degrees C for 1982-2014 due to enhanced evapotranspiration. However, greening generates weak temperature changes in spring (+0.02 +/- 0.06 degrees C) and autumn (-0.05 +/- 0.05 degrees 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. The seasonal greening of Northern Hemisphere ecosystems due to extended growing periods and enhanced photosynthetic activity is, via experiments, shown to modify near-surface warming by perturbing land-atmosphere energy exchanges.
ISSN
2041-1723
URI
https://hdl.handle.net/10371/185375
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Graduate School of Environmental Studies (환경대학원)Dept. of Environmental Planning (환경계획학과)Journal Papers (저널논문_환경계획학과)
Graduate School of Environmental Studies (환경대학원)Dept. of Environmental Planning (환경계획학과)Journal Papers (저널논문_환경계획학과)
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