Space-Time Distribution of Rainfall Anomaly Index (RAI) for the Salgado Basin, Ceará State - Brazil

Authors

  • Juliana Alcântara Costa Universidade Federal do Recôncavo da Bahia
  • Gláuber Pontes Rodrigues Universidade Federal do Ceará

DOI:

https://doi.org/10.5902/2179460X26080

Keywords:

Climatic indexes, drought, SSTA

Abstract

Given the great variability of the precipitation in the Brazilian Northeast, it is necessary to use climate indexes for its monitoring. In this sense, this work aims to present a study of the space-time variation in the rainfall precipitation at the Salgado Basin, located in the state of Ceará, using the Rainfall Anomaly Index (RAI) as a tool. In order to do so, daily precipitation data from seven meteorological stations were used for the period between 1974 and 2015. From the data obtained, the RAI was calculated and plotted in spatial distribution maps. It was possible to observe that the rainy season at the basin lasts from January to April, and the driest period of the year lasts from July to October. The historical series presented drier years than rainy ones. A variation in the RAI within the basin was evidenced, and the region corresponding to Chapada do Araripe was more humid. The years with the most extreme anomalies were related to SSTA events, which favored its occurrence.

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Author Biographies

Juliana Alcântara Costa, Universidade Federal do Recôncavo da Bahia

Centro de Ciências Agrárias, Ambientais e Biológicas, Núcleo de Engenharia de Água e Solo - NEAS

Gláuber Pontes Rodrigues, Universidade Federal do Ceará

Centro de Ciências Agrárias, Departamento de Engenharia Agrícola - DENA

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Published

2017-11-18

How to Cite

Costa, J. A., & Rodrigues, G. P. (2017). Space-Time Distribution of Rainfall Anomaly Index (RAI) for the Salgado Basin, Ceará State - Brazil. Ciência E Natura, 39(3), 627–634. https://doi.org/10.5902/2179460X26080

Issue

Vol. 39 No. 3 (2017)

Section

Meteorology

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