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Drouth Events Analysis for the Western Bahia based on Collected and Reanalysis Datasets

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2015 ASABE Annual International Meeting  152190800.(doi:10.13031/aim.20152190800)
Authors:   M.A.V. Silva, C.C. Santana, L. da S. Menezes, W.P.M. Ferreira
Keywords:   weather data, hydrologic cycle, drought.

Abstract. As a result of the wide use in scientific studies of the Reanalysis data produced jointly by the National Centers for Environmental Prediction (NCEP) and National Center for Atmospheric Research (NCAR) and Climate Research Unit (CRU), and given the utmost importance in the State economy scenario that represents the Wester Bahia region, which has a insufficient network of meteorological stations to allow good weather or agronomic studies, the current study aimed to compare the drought events occurrence from the use of rainfall observed data and from reanalysis datasets to the West region of Bahia. Monthly rainfall data were used from the National water Agency (ANA) and Reanalysis data from the Climate Research Unit (CRU) since 1981 until 2012. For analysis of drought events was used the Standardized Precipitation index (SPI) for the three months intervals (SPI3), based on the month of February considered as the month of flowering and grain filling, and, or for most crops in the region. The comparative analysis between the results of SPI3, from Reanalysis data of the CRU and those observed by ANA, indicated the existence of a good correlation between both (r2 = 0.88), ensuring good accuracy to the evaluation of drought index performed based on Reanalysis data.

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