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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/gmd-2020-179
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-179
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: development and technical paper 07 Jul 2020

Submitted as: development and technical paper | 07 Jul 2020

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A revised version of this preprint was accepted for the journal GMD and is expected to appear here in due course.

Enhancement and validation of the state-of-the-art global hydrological model H08 (v.bio1) to simulate second-generation herbaceous bioenergy crop yield

Zhipin Ai1, Naota Hanasaki1, Vera Heck2, Tomoko Hasegawa3, and Shinichiro Fujimori4 Zhipin Ai et al.
  • 1Center for Climate Change Adaptation, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba 305-8506, Japan
  • 2Potsdam Institute for Climate Impact Research, Telegraphenberg A 31, Potsdam 14473, Germany
  • 3Department of Civil and Environmental Engineering, Ritsumeikan University, 56-1, Toji-in Kitamachi, Kita-ku, Kyoto 603-8577, Japan
  • 4Department of Environmental Engineering, Kyoto University, Building C1-3, C-cluster, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8504, Japan

Abstract. Large-scale deployment of bioenergy plantations would have adverse effects on water resources. There is an increasing need to ensure the appropriate inclusion of the bioenergy crops in global hydrological models. Here, through parameter calibration and algorithm improvement, we enhanced the global hydrological model H08 to simulate the bioenergy yield from two dedicated herbaceous bioenergy crops, Miscanthus and switchgrass. Site-specific evaluations showed that the enhanced model had the ability to simulate yield for both Miscanthus and switchgrass, with the calibrated yields being well within the ranges of the observed yield. Independent country-specific evaluations further confirmed the performance of the enhanced H08. Using this improved model, we found that unconstrained irrigation more than doubled the yield of the rainfed condition, but reduced the water use efficiency (WUE) by 32 % globally. With irrigation, the yield in dry climate zones can exceed the rainfed yields in tropical climate zones. Nevertheless, due to the low water consumption in tropical areas, the highest WUE was found in tropical climate zones, regardless of whether the crop was irrigated. Our enhanced model provides a new tool for the future assessment of bioenergy–water tradeoffs.

Zhipin Ai et al.

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Latest update: 28 Oct 2020
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Short summary
There is an increasing need to ensure the appropriate inclusion of the bioenergy crops in global hydrological models. Here, we enhanced a state-of-the-art global hydrological model to simulate bioenergy crop yield. We found that unconstrained irrigation more than doubled the yield under rainfed condition, while simultaneously reducing the water-use efficiency by 32 % globally. Our enhanced model provides a new tool for the future assessment of bioenergy–water tradeoffs.
There is an increasing need to ensure the appropriate inclusion of the bioenergy crops in global...
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