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Climate change in the Paraná state, Brazil: responses to increasing atmospheric CO2 in reference evapotranspiration

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Abstract

The hydrological variable evapotranspiration (ET) is challenging to estimate because it cannot be measured directly in natural environments (except in small plots). The uncertainties associated with the models used for its prediction have increased under climate change conditions. We studied the influence of stomatal resistance on ET estimates using the Penman-Monteith method as projected by three general circulation models in two emission scenarios (RCP4.5 and RCP8.5) for future climates throughout the twenty-first century (2010–2039, 2040–2069, and 2070–2099). We also investigated the probable ET rate changes in relation to the current (30 years average, 1980–2009) climate conditions for the Paraná state in the southern region of Brazil. The results were regionalized to help policymakers assess climate change impacts and design adaptation measures. ET increases of up to 15% were found in future climate conditions, which may lead to a significant increase in the water demand for agricultural crops. However, we believe that plant morphophysiological changes may occur under atmospheric CO2 enrichment conditions and that a possible reduction in stomatal conductance will result in lower ET increases than those obtained with the traditional Penman-Monteith method. When considering future climate scenarios, we propose the equation be adjusted to consider stomatal resistance as a function of CO2 concentrations.

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Funding

We would like to thank the funding agency Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the post-doctoral scholarship of the first author and also the financial support through funding PNPD/CAPES (Agreement UEG/CAPES N. 817164/2015-PROAP).

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Correspondence to Lucas da Costa Santos.

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da Costa Santos, L., José, J.V., Bender, F.D. et al. Climate change in the Paraná state, Brazil: responses to increasing atmospheric CO2 in reference evapotranspiration. Theor Appl Climatol 140, 55–68 (2020). https://doi.org/10.1007/s00704-019-03057-7

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  • DOI: https://doi.org/10.1007/s00704-019-03057-7

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