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Trend of annual temperature and frequency of extreme events in the MATOPIBA region of Brazil

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Abstract

During the 1980s, a new agricultural frontier arouse in Brazil, which occupied part of the states of Maranhão, Tocantins, Piauí, and Bahia. Currently, this new frontier is known as the MATOPIBA region. The region went through intense transformations in its social and environmental characteristics, with the emergence of extensive areas of intensive agriculture and large herds. The purpose of this research was to study the climatic variabilities of temperature in the MATOPIBA region through extreme climate indexes of ClimAp tool. Data from 11 weather stations were analyzed for yearly air temperature (maximum and minimum) in the period of 1970 to 2012. To verify the trend in the series, we used methods of linear regression analysis and Kendall-tau test. The annual analysis of maximum and minimum temperatures and of the temperature extremes indexes showed a strong positive trend in practically every series (with p value less than 0.05). These results indicated that the region went through to a significant heating process in the last 3 decades. The indices of extreme also showed a significant positive trend in most of the analyzed stations, indicating a higher frequency of warm days during the year.

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Authors and Affiliations

  1. Instituto Nacional de Meteorologia, INMET, Eixo Monumental, Via S1, Sudoeste, Brasilia, DF, 70680-900, Brazil

    Mozar de A. Salvador

  2. Unidade Acadêmica de Ciências Atmosféricas da Universidade Federal de Campina Grande UACA-UFCG, Campus de Campina Grande, Av. Aprígio Veloso, 882, Bairro Universitário, Campina Grande, PB, 58109-970, Brazil

    J. I. B. de Brito

Authors
  1. Mozar de A. Salvador
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  2. J. I. B. de Brito
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Correspondence to Mozar de A. Salvador.

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Salvador, M.d.A., de Brito, J.I.B. Trend of annual temperature and frequency of extreme events in the MATOPIBA region of Brazil. Theor Appl Climatol 133, 253–261 (2018). https://doi.org/10.1007/s00704-017-2179-5

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