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Article Dans Une Revue Biogeosciences Année : 2020

Wide discrepancies in the magnitude and direction of modeled solar-induced chlorophyll fluorescence in response to light conditions

Brett Raczka
  • Fonction : Auteur
Cédric Bacour
Yongguang Zhang
Bo Qiu
  • Fonction : Auteur
  • PersonId : 766101
  • IdRef : 183178521
Natasha Macbean
Dave Bowling
  • Fonction : Auteur

Résumé

Recent successes in passive remote sensing of far-red solar-induced chlorophyll fluorescence (SIF) have spurred the development and integration of canopy-level fluorescence models in global terrestrial biosphere models (TBMs) for climate and carbon cycle research. The interaction of fluorescence with photochemistry at the leaf and canopy scales provides opportunities to diagnose and constrain model simulations of photosynthesis and related processes , through direct comparison to and assimilation of tower, airborne, and satellite data. TBMs describe key processes related to the absorption of sunlight, leaf-level fluo-rescence emission, scattering, and reabsorption throughout the canopy. Here, we analyze simulations from an ensemble of process-based TBM-SIF models (SiB3-Simple Bio-sphere Model, SiB4, CLM4.5-Community Land Model, CLM5.0, BETHY-Biosphere Energy Transfer Hydrology, ORCHIDEE-Organizing Carbon and Hydrology In Dynamic Ecosystems, and BEPS-Boreal Ecosystems Productivity Simulator) and the SCOPE (Soil Canopy Observation Photosynthesis Energy) canopy radiation and vegetation model at a subalpine evergreen needleleaf forest near Niwot Ridge, Colorado. These models are forced with local meteorology and analyzed against tower-based continuous far-red SIF and gross-primary-productivity-partitioned (GPP) eddy covariance data at diurnal and synoptic scales during the growing season (July-August 2017). Our primary objective is to summarize the site-level state of the art in TBM-SIF modeling over a relatively short time period (sum-Published by Copernicus Publications on behalf of the European Geosciences Union. 3734 N. C. Parazoo et al.: Wide discrepancies in the magnitude and direction of modeled SIF mer) when light, canopy structure, and pigments are similar , setting the stage for regional-to global-scale analyses. We find that these models are generally well constrained in simulating photosynthetic yield but show strongly divergent patterns in the simulation of absorbed photosynthetic active radiation (PAR), absolute GPP and fluorescence, quantum yields, and light response at the leaf and canopy scales. This study highlights the need for mechanistic modeling of non-photochemical quenching in stressed and unstressed environments and improved the representation of light absorption (APAR), distribution of light across sunlit and shaded leaves, and radiative transfer from the leaf to the canopy scale.
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hal-02903357 , version 1 (15-09-2020)

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Nicholas Parazoo, Troy Magney, Alex Norton, Brett Raczka, Cédric Bacour, et al.. Wide discrepancies in the magnitude and direction of modeled solar-induced chlorophyll fluorescence in response to light conditions. Biogeosciences, 2020, 17 (13), pp.3733-3755. ⟨10.5194/bg-17-3733-2020⟩. ⟨hal-02903357⟩
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