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Warm winters challenge the cultivation of temperate species in South America—a spatial analysis of chill accumulation

Author

Listed:
  • Eduardo Fernandez

    (University of Bonn)

  • Lars Caspersen

    (University of Bonn)

  • Ilja Illert

    (University of Bonn)

  • Eike Luedeling

    (University of Bonn)

Abstract

Winter chill accumulation plays a crucial role in determining the moment of bud burst in temperate fruit and nut trees, and insufficient chill can greatly limit yield potentials. To assess future cultivation options for such species in South America, we estimated winter chill through a spatial analysis. We used historical data (1980–2017) from 158 weather stations to calibrate a weather generator and produce temperature data for 10 historical and 60 future scenarios. We computed Safe Winter Chill (SWC, corresponding to the 10th quantile of a chill distribution) for the period 1980–2017 and for all historical and future weather scenarios and developed a framework to interpolate SWC for the continent using the Kriging method. To improve the interpolation, we applied a 3D correction model based on two co-variables (means of daily temperature extremes in July). Our results suggest important chill declines in southern Brazil and central Chile. By 2050 under the global warming scenario RCP4.5 (Representative Concentration Pathway), absolute SWC in these regions may reach a median of 18.7 and 39.6 Chill Portions (CP), respectively. Projections are most alarming for a strong global warming scenario (RCP8.5). In southern South America, adequate SWC levels of about 60 CP may be expected even under the RCP8.5 scenario. Our results highlight the need for climate change adaptation measures to secure temperate fruit production in important growing regions of South America. The procedure we developed may help farmers and practitioners across South America estimate future SWC to adapt their orchards to future challenges.

Suggested Citation

  • Eduardo Fernandez & Lars Caspersen & Ilja Illert & Eike Luedeling, 2021. "Warm winters challenge the cultivation of temperate species in South America—a spatial analysis of chill accumulation," Climatic Change, Springer, vol. 169(3), pages 1-19, December.
    • Handle: RePEc:spr:climat:v:169:y:2021:i:3:d:10.1007_s10584-021-03276-w
    DOI: 10.1007/s10584-021-03276-w
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    References listed on IDEAS

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    1. Haïfa Benmoussa & Eike Luedeling & Mohamed Ghrab & Mehdi Ben Mimoun, 2020. "Severe winter chill decline impacts Tunisian fruit and nut orchards," Climatic Change, Springer, vol. 162(3), pages 1249-1267, October.
    2. Andreas Buerkert & Eduardo Fernandez & Beke Tietjen & Eike Luedeling, 2020. "Revisiting climate change effects on winter chill in mountain oases of northern Oman," Climatic Change, Springer, vol. 162(3), pages 1399-1417, October.
    3. Evan H Girvetz & Chris Zganjar & George T Raber & Edwin P Maurer & Peter Kareiva & Joshua J Lawler, 2009. "Applied Climate-Change Analysis: The Climate Wizard Tool," PLOS ONE, Public Library of Science, vol. 4(12), pages 1-19, December.
    4. Detlef Vuuren & Jae Edmonds & Mikiko Kainuma & Keywan Riahi & Allison Thomson & Kathy Hibbard & George Hurtt & Tom Kram & Volker Krey & Jean-Francois Lamarque & Toshihiko Masui & Malte Meinshausen & N, 2011. "The representative concentration pathways: an overview," Climatic Change, Springer, vol. 109(1), pages 5-31, November.
    5. R. Darbyshire & P. Measham & I. Goodwin, 2016. "A crop and cultivar-specific approach to assess future winter chill risk for fruit and nut trees," Climatic Change, Springer, vol. 137(3), pages 541-556, August.
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