Skip to main content
Log in

Climate change impacts on evapotranspiration in Brazil: a multi-model assessment

  • Original Paper
  • Published:
Theoretical and Applied Climatology Aims and scope Submit manuscript

Abstract

A large part of Brazil is highly vulnerable to climate changes projected for the end of the 21st century. Analyzing these vulnerabilities is particularly important for agriculture, since the country is one of the largest agricultural commodity producers in the world. Changes in the reference evapotranspiration (ETo) can impact crops and make cultivation unfeasible. However, studies on ETo patterns under climate change scenarios for Brazil have been restricted to regional scales and use too few climate models or too simplified water balance models for their analysis. This can lead to uncertainties in assessing the impacts of climate change on ETo. Therefore, this study seeks to analyze ETo patterns in Brazil towards the end of the 21st century using two methods that are better at estimating regional ETo, i.e., the Turc and Abtew methods, under two radiative forcing scenarios (RCPs 4.5 and 8.5). Daily data on near-surface air temperature (mean and maximum), global solar radiation, and near-surface relative humidity from six General Circulation Models (GCMs) from the Coupled Model Intercomparison Project Phase 5 (CMIP5) were used to analyze the simulations and projections for climate change. The performance of climate simulations is heterogeneous among the GCMs, with overestimations (~ 2.5 mm day− 1) in some models, and underestimations (~ 1.5 mm day− 1) in others. In general, climate change projections indicate increases of up to 1 mm day− 1 in ETo, mainly in the North, Northeast, and Center-West regions of Brazil. Both estimation methods showed similar spatial patterns, however the Turc method projected lower intensity changes compared to the Abtew method.

Highlights

The Turc method showed the best performance in estimating ETo, resulting in more reliable climate simulation and projections.

There was divergence between climate models when simulating solar radiation and relative humidity.

Climate models projected an increase in temperature (mean and maximum), and a reduction in relative humidity towards the end of the 21st century.

The projected ETo showed similar patterns between the Turc and Abtew methods.

Increases from 0.4 to 1 mm day− 1 are projected for ETo in the North, Northeast, and Center-West of Brazil, and from 0.2 to 0.4 mm day− 1 in the South of Brazil.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6

Similar content being viewed by others

Data availability

The data used in the article will be fully available, in order to contribute to transparency. If was necessary, all data used to support the findings of this study are available from the corresponding author upon reasonable request.

References

Download references

Acknowledgements

The authors would like to thank the Minas Gerais Research Support Foundation (FAPEMIG) for financially supporting projects, and for granting scholarships to the 1st author (FAPEMIG process number ID-13748–5.304/15), and to also thank the Coordination for the Improvement of Higher Education Personnel (CAPES, process numbers 1780316 and 88882.430051/2019-01), for granting scholarships to the 1st and 4th authors, and the National Council for Scientific and Technological Development (CNPq, process numbers 309215/2021-8 and 306845/2021-0) for the research fellowship granted to the 2nd and 3rd authors. The authors also thank Ph.D. Alexandre Cândido Xavier for making available the observed spatialized data on the Brazilian territory, and the Natural Resources Institute of Universidade Federal de Itajubá for providing subsidies to the publication of this article.

Funding

Financial support was received from Minas Gerais Research Support Foundation (FAPEMIG) for granting scholarships to the 1st author (FAPEMIG process number ID-13748–5.304/15), from Coordination for the Improvement of Higher Education Personnel (CAPES, process numbers 1780316 and 88882.430051/2019-01) for granting scholarships to the 1st and 4th authors, and from the National Council for Scientific and Technological Development (CNPq, process numbers 309215/2021-8 and 306845/2021-0) for the research fellowship granted to the 2nd and 3rd authors.

Author information

Authors and Affiliations

Authors

Contributions

Monteiro, A. F. M.: Conceptualization, Design of methodology, Data acquisition, Data analysis, Writing and editing, Data curation, Software. Torres, R. R.: Conceptualization, Design of methodology, Data analysis, Writing, review and editing, Supervision, Project administration, Founding acquisition. Martins, F. B.: Conceptualization, Design of methodology, Data analysis, Writing, review and editing, Supervision, Project administration, Founding acquisition. Marrafon, V. H. de. A.: Data analysis, Data curation, Software.

Corresponding author

Correspondence to Roger Rodrigues Torres.

Ethics declarations

Ethical approval

Not applicable.

Conflicts of interest

The authors have no relevant financial or non-financial interests to disclose.

Additional information

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Supplementary Material 1

Rights and permissions

Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Monteiro, A.F.M., Torres, R.R., Martins, F.B. et al. Climate change impacts on evapotranspiration in Brazil: a multi-model assessment. Theor Appl Climatol (2024). https://doi.org/10.1007/s00704-024-04942-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s00704-024-04942-6

Navigation