Abstract
Trend analysis is an important issue for the decision-making processes. Thus, trends of rainfall, consecutive dry days (CDD), and consecutive wet days (CWD) in the Upper São Francisco River basin, Brazil, using daily rainfall data from the Tropical Rainfall Measuring Mission (TRMM) for recent 18 years, were analyzed. Instead of analyzing the trend of one average time series for one specific confidence level, a spatiotemporal analysis over the entire area with 169 continuous time series is done by applying the nonparametric Mann-Kendall and Sen tests for simultaneously 13 confidence levels and a new integrated confidence classification is proposed. The results show that the rainfall has increased during the less rainy periods (from June to October) and has decreased in the rainy periods (from November to May), with the highest and lowest confidence levels, respectively. An analysis of CDD and CWD shows that the number of CDD has decreased, while the number of CWD has increased, which revealed that the dry periods are more frequently interrupted for the period studied.
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Acknowledgments
The data from the Tropical Rainfall Measuring Mission (TRMM) are gratefully acknowledged.
Funding
The financial support was provided by the National Council for Scientific and Technological Development, Brazil – CNPq (Grant Nos. 305413/2014-7 and 311347/2014-2)
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Santos, C.A.G., Brasil Neto, R.M., da Silva, R.M. et al. Integrated spatiotemporal trends using TRMM 3B42 data for the Upper São Francisco River basin, Brazil. Environ Monit Assess 190, 175 (2018). https://doi.org/10.1007/s10661-018-6536-3
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DOI: https://doi.org/10.1007/s10661-018-6536-3