Abstract
The São Francisco River is strategically important due to its hydroelectric potential and for bringing the largest water body of Brazilian Semiarid region, supplying water for irrigation, urban, and industrial activities. Thereby, for the purpose of characterizing changes on the precipitation patterns over São Francisco River basin, 11 extremes precipitation indices as defined by the joint WMO/CCI/ETCCDMI/CLIVAR project were calculated using daily observation from the 59 rain gauges during 1947–2012 period. The extreme climatic indices were calculated with the RClimDex software, which performs an exhaustive data quality control, intending to identify spurious errors and dataset inconsistencies. Weak and significant regional changes were observed in both CDD and SDII indices. Most precipitation extremes indices decreased but without statistical significance. The spatial analysis of indices did not show clearly regional changes due to the complexity of hydrometeorology of the region. In some cases, two rainfall stations exhibited opposite trends with the same significance level although they are separated by a few kilometers. This has occurred more frequently in Lower-Middle São Francisco, probably associated with intense land cover change over the last decades in this region.
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The authors acknowledge to National Agency for the Water (ANA) which provided daily precipitation data over the São Francisco River Basin.
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Bezerra, B.G., Silva, L.L., Santos e Silva, C.M. et al. Changes of precipitation extremes indices in São Francisco River Basin, Brazil from 1947 to 2012. Theor Appl Climatol 135, 565–576 (2019). https://doi.org/10.1007/s00704-018-2396-6
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DOI: https://doi.org/10.1007/s00704-018-2396-6