Abstract
The potential impact of the rise in atmospheric CO2 concentration and associated climatic change on agricultural productivity needs assessment. Projecting crop yield changes under climate change requires future climate scenarios as input to crop yield models. It is widely accepted that downscaling of climate data is required to bridge the gap between large-scale global climate models (GCMs) and climate change impact models, such as crop growth models. Regional climate models (RCMs) are often used to dynamically downscale GCM simulations to smaller regional scales, while statistical methods, such as regression-based transfer functions and stochastic weather generators, are also widely employed to develop future climate scenarios for this purpose. The methods used in developing future climate scenarios often contribute to uncertainties in the projected impacts of climate change, in addition to those associated with GCMs and forcing scenarios. We employed climate scenarios from the state-of-the-art RCMs in the North American Regional Climate Change Assessment Program (NARCCAP), along with climate scenarios generated by a stochastic weather generator based on climate change simulations performed by their driving GCMs, to drive the CERES-Wheat model in DSSAT to project changes in spring wheat yield on the Canadian Prairies. The future time horizon of 2041–2070 and the baseline period of 1971–2000 were considered. The projected changes showed an average increase ranging from 26 to 37 % of the baseline yield when the effects of the elevated CO2 concentration were simulated, but only up to 15 % if the elevated CO2 effect was excluded. In addition to their potential use in climate change impact assessment, the results also demonstrated that the simulated crop yield changes were fairly consistent whether future climate scenarios were derived from RCMs or they were generated by a stochastic weather generator based on the simulated climate change from the GCMs that were used to drive the RCMs, in this case, when they were compared for regional averages.
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Acknowledgments
This study was partially supported by The Sustainable Agriculture Environmental Systems (SAGES) Initiative financed by the Government of Canada and the provincial and territorial governments. We are indebted to Mr. Guilong Li of Environment Canada for his help in extracting and verifying RCM data. We wish to thank the North American Regional Climate Change Assessment Program (NARCCAP) and Dr. Linda O. Mearns for providing the RCM data and advice. NARCCAP is funded by the National Science Foundation (NSF), the U.S. Department of Energy (DoE), the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Environmental Protection Agency Office of Research and Development (EPA). We are indebted to two anonymous reviewers for their comments that helped in improving this paper. This is ECORC contribution No. 15-003.
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Qian, B., De Jong, R., Huffman, T. et al. Projecting yield changes of spring wheat under future climate scenarios on the Canadian Prairies. Theor Appl Climatol 123, 651–669 (2016). https://doi.org/10.1007/s00704-015-1378-1
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DOI: https://doi.org/10.1007/s00704-015-1378-1