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Identifying optimal cloud cover for enhanced forest carbon uptake: Periodic-case NEE-overshoot modelling

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  • Kivalov, Sergey N

Abstract

On certain kinds of cloudy days, many forested ecosystems exhibit enhanced carbon uptake and water-use efficiency-the cloudy-day forest flux anomaly. Using ensemble methods to analyze eddy-covariance fluxes, we have diagnosed net ecosystem exchange (NEE) and water-use efficiency (WUE) of a temperate broadleaf forest and a tropical evergreen forest as they responded to natural fluctuating-light regimes. Here we apply average NEE and evapotranspiration solutions of a first-order dynamic model to describe the observed whole-canopy sensitivity to periodic light. On partly-cloudy days, maximum overall NEE enhancements over conventional steady-state equilibrium estimates are ≈ 25% for a midlatitude deciduous forest and ≈ 15% for a tropical evergreen forest. This finding supports our conclusion that in many cases the cloudy-day anomaly is a consequence of a dynamic response by the trees responding to fluctuating-light regimes occasioned by passing cumulus clouds.

Suggested Citation

  • Kivalov, Sergey N, 2024. "Identifying optimal cloud cover for enhanced forest carbon uptake: Periodic-case NEE-overshoot modelling," Ecological Modelling, Elsevier, vol. 498(C).
    • Handle: RePEc:eee:ecomod:v:498:y:2024:i:c:s0304380024002928
    DOI: 10.1016/j.ecolmodel.2024.110904
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