Calibrating soybean parameters in JULES 5.0 from the US-Ne2/3 FLUXNET sites and the SoyFACE-O 3 experiment

Leung, Felix; Williams, Karina; Sitch, Stephen; Tai, Amos P. K.; Wiltshire, Andy; Gornall, Jemma; Ainsworth, Elizabeth A.; Arkebauer, Timothy; Scoby, David

Tropospheric ozone (Oinline-formula3) is the third most important anthropogenic greenhouse gas. Oinline-formula3 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 Oinline-formula3 damage parameters and applies default C3 grass Oinline-formula3 parameters for soybean that underestimate Oinline-formula3 damage. Physiological parameters for Oinline-formula3 damage in soybean in JULES-crop were calibrated against leaf gas-exchange measurements from the Soybean Free Air Concentration Enrichment (SoyFACE) with Oinline-formula3 experiment in Illinois, USA. Other plant parameters were calibrated using an extensive array of soybean observations such as crop height and leaf carbon 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.

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Leung, Felix / Williams, Karina / Sitch, Stephen / et al: Calibrating soybean parameters in JULES 5.0 from the US-Ne2/3 FLUXNET sites and the SoyFACE-O3 experiment. 2020. Copernicus Publications.

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