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A comparison of downscaling techniques in the projection of local climate change and wheat yields

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  • Qunying Luo
  • Li Wen
  • John McGregor
  • Bertrand Timbal

Abstract

This study aims to evaluate the performance of two mainstream downscaling techniques: statistical and dynamical downscaling and to compare the differences in their projection of future climate change and the resultant impact on wheat crop yields for three locations across New South Wales, Australia. Bureau of Meteorology statistically- and CSIRO dynamically-downscaled climate, derived or driven by the CSIRO Mk 3.5 coupled general circulation model, were firstly evaluated against observed climate data for the period 1980–1999. Future climate projections derived from the two downscaling approaches for the period centred on 2055 were then compared. A stochastic weather generator, LARS-WG, was used in this study to derive monthly climate changes and to construct climate change scenarios. The Agricultural Production System sIMulator-Wheat model was then combined with the constructed climate change scenarios to quantify the impact of climate change on wheat grain yield. Statistical results show that (1) in terms of reproducing the past climate, statistical downscaling performed better over dynamical downscaling in most of the cases including climate variables, their mean, variance and distribution, and study locations, (2) there is significant difference between the two downscaling techniques in projected future climate change except the mean value of rainfall across the three locations for most of the months; and (3) there is significant difference in projected wheat grain yields between the two downscaling techniques at two of the three locations. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • Qunying Luo & Li Wen & John McGregor & Bertrand Timbal, 2013. "A comparison of downscaling techniques in the projection of local climate change and wheat yields," Climatic Change, Springer, vol. 120(1), pages 249-261, September.
    • Handle: RePEc:spr:climat:v:120:y:2013:i:1:p:249-261
    DOI: 10.1007/s10584-013-0802-8
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    References listed on IDEAS

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    1. Peter A. Stott & J. A. Kettleborough, 2002. "Erratum: Origins and estimates of uncertainty in predictions of twenty-first century temperature rise," Nature, Nature, vol. 417(6885), pages 205-205, May.
    2. Luo, Qunying & Williams, Martin A. J. & Bellotti, William & Bryan, Brett, 2003. "Quantitative and visual assessments of climate change impacts on South Australian wheat production," Agricultural Systems, Elsevier, vol. 77(3), pages 173-186, September.
    3. Probert, M. E. & Dimes, J. P. & Keating, B. A. & Dalal, R. C. & Strong, W. M., 1998. "APSIM's water and nitrogen modules and simulation of the dynamics of water and nitrogen in fallow systems," Agricultural Systems, Elsevier, vol. 56(1), pages 1-28, January.
    4. Peter A. Stott & J. A. Kettleborough, 2002. "Origins and estimates of uncertainty in predictions of twenty-first century temperature rise," Nature, Nature, vol. 416(6882), pages 723-726, April.
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    Cited by:

    1. Luo, Qunying & Bange, Michael & Braunack, Michael & Johnston, David, 2016. "Effectiveness of agronomic practices in dealing with climate change impacts in the Australian cotton industry — A simulation study," Agricultural Systems, Elsevier, vol. 147(C), pages 1-9.
    2. A. Casanueva & S. Herrera & J. Fernández & J.M. Gutiérrez, 2016. "Towards a fair comparison of statistical and dynamical downscaling in the framework of the EURO-CORDEX initiative," Climatic Change, Springer, vol. 137(3), pages 411-426, August.
    3. Qunying Luo & Michael Bange & David Johnston, 2016. "Environment and cotton fibre quality," Climatic Change, Springer, vol. 138(1), pages 207-221, September.
    4. Stella Tsoka & Kondylia Velikou & Konstantia Tolika & Aikaterini Tsikaloudaki, 2021. "Evaluating the Combined Effect of Climate Change and Urban Microclimate on Buildings’ Heating and Cooling Energy Demand in a Mediterranean City," Energies, MDPI, vol. 14(18), pages 1-23, September.

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