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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gmd-2020-97
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-97
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 03 Jun 2020

Submitted as: model description paper | 03 Jun 2020

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This preprint is currently under review for the journal GMD.

Calibrating soybean parameters in JULES5.0 from the US-Ne2/3 FLUXNET sites and the SoyFACE-O3 experiment

Felix Leung1,3, Karina Williams2,7, Stephen Sitch1, Amos P.K. Tai3,6, Andy Wiltshire2, Jemma Gornall2, Elizabeth A. Ainsworth4, Timiothy Arkebauer5, and David Scoby5 Felix Leung et al.
  • 1College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, UK
  • 2Met Office Hadley Centre, FitzRoy Road, Exeter, Devon, UK
  • 3Earth System Science Programme, Faculty of Science, and Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong
  • 4USDA ARS, Global Change and Photosynthesis Research Unit, Urbana, Illinois, USA
  • 5Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
  • 6State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong
  • 7Global System Institute, University of Exeter, Laver Building, North ParkRoad, Exeter EX4 4QE, UK

Abstract. Tropospheric ozone (O3) is the third most important anthropogenic greenhouse gas. O3 is detrimental to plant productivity, and it has a significant impact on crop yield. Currently, the Joint UK Land Environment Simulator (JULES) land surface model includes a representation of global crops (JULES-crop), but does not have crop-specific O3 damage parameters, and applies default C3 grass O3 parameters for soybean that underestimates O3 damage. Physiological parameters for O3 damage in soybean in JULES-crop were calibrated against leaf gas-exchange measurements from the Soybean Free-Air-Concentration-Enrichment (SoyFACE) with O3 experiment in Illinois, USA. Other plant parameters were calibrated using an extensive array of soybean observations such as crop height, leaf carbon, etc. and meteorological data from FLUXNET sites near Mead, Nebraska, USA. The yield, aboveground carbon and leaf area index (LAI) of soybean from the SoyFACE experiment were used to evaluate the newly calibrated parameters. The result shows good performance for yield, with the modelled yield being within the spread of the SoyFACE observations. Although JULES-crop is able to reproduce observed LAI seasonality, its magnitude is underestimated. The newly calibrated version of JULES will be applied regionally and globally in future JULES simulations. This study helps to build a state-of-the-art impact assessment model and contribute to a more complete understanding of the impacts of climate change on food production.

Felix Leung et al.

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Felix Leung et al.

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Short summary
Ground-level ozone (O3) is detrimental to plant productivity and crop yield. Currently the Joint UK Land Environment Simulator (JULES) includes a representation of crops (JULES-crop). The parameters for O3 damage in soybean in JULES-crop were calibrated against photosynthesis measurements from the Soybean Free-Air-Concentration-Enrichment (SoyFACE). The result shows good performance for yield and it helps contribute to understanding of the impacts of climate and air pollution on food production.
Ground-level ozone (O3) is detrimental to plant productivity and crop yield. Currently the Joint...
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