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Application of ERA5-Land reanalysis data in zoning of climate risk for corn in the state of Bahia—Brazil

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Abstract

The agricultural zoning of climate risk (AZCR) is a fundamental tool for agricultural activities, as it identifies regions and times of lower climatic risk for planting and sowing crops. An AZCR representative of large areas requires a network of meteorological stations with dense spatial distribution, routine, and accurate observations. In Brazil, there is a good spatial distribution of rain gauges, but there is a scarcity in the spatial distribution of meteorological stations necessary to conduct an AZCR. One way to overcome the lack of data observed in situ is to use reanalysis data. However, it is necessary to show that it is possible to perform a reliable AZCR using it. Therefore, the objective of this research is to elaborate an AZCR for corn in the state of Bahia using reanalysis data and quantifying its viability. The ERA5-Land reanalysis database was chosen. When performing the validation of the ERA5-Land reanalysis data, it was verified that rainfall was the only meteorological variable needed for an AZCR that did not present seasonal and interannual values and variability similar to those already observed. Therefore, it was decided to validate the rainfall data from the CPC/NOAA Precipitation Project. With data from the ERA5-Land and CPC/NOAA Precipitation Project reanalysis validated, the AZCR for corn was performed in the state of Bahia, leading to the conclusion that it is possible to develop a reliable and robust AZCR with reanalysis data.

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Data availability

The datasets analyzed in the present study are available in the ECWMF repository [https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-land], NASA repository [https://psl.noaa.gov/data/gridded/data.cpc.globalprecip.html], and INMET repository [https://bdmep.inmet.gov.br/].

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Funding

This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). The authors declare that only the first author has received a grant to conducting her scientific research.

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Contributions

The preparation data was made by and analysis were performed by WKM, GCAJ and JIBB. The first draft of the manuscript was written by WKM and the authors ESGS, FFL, JIBB, CACS and EPL commented, rating and proofreading on previous versions of the manuscript to improve. All authors contributed to this study and approved the final manuscript.

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Correspondence to Wendy Kaori Matsunaga.

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I state herewith that the material of this article is not being presently considered for publication in any other journal, that its publication is approved by all authors and by the responsible authorities where the work was carried out, and that, if accepted, it will not be published elsewhere, including electronically, in the same form, in English or any other language without the written consent of the copyright holder.

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Matsunaga, W.K., Sales, E.S.G., Júnior, G.C.A. et al. Application of ERA5-Land reanalysis data in zoning of climate risk for corn in the state of Bahia—Brazil. Theor Appl Climatol 155, 945–963 (2024). https://doi.org/10.1007/s00704-023-04670-3

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  • DOI: https://doi.org/10.1007/s00704-023-04670-3

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