Analysis of Precipitation Temporal Variability in the Florianópolis/SC City
DOI:
https://doi.org/10.5902/2179460X55310Keywords:
Rain Anomaly Index, El Niño – Southern Oscillation, Pacific Decadal Oscillation, Precipitation variabilityAbstract
The excess or deficiency of precipitation directly affects environmental conditions, influencing society and its various economic sectors. This study analyzes the variability of precipitation in Florianópolis / SC, using the Rain Anomaly Index (RAI). To identify possible changes in the precipitation pattern, non-parametric tests are performed with a 5% significance and linear regression with a 95% confidence level in the data from the Climate Prediction Center (CPC) during the period 1979 to 2017. The results show that the most of the positive (negative) precipitation indexes correspond to the years of the warm (cold) phase of the Pacific Decadal Oscillation (PDO), and with the highest frequency of El Niño (La Niña) events. Annual time series indicate a decline in precipitation. It is also observed: (i) a small tendency to reduce rainfall in summer, autumn and winter; (ii) a significant tendency to reduce rainfall in the spring (61.4 mm in the period) and (iii) a reduction of 7.9 mm / year and a total of 308.6 mm in the period. It can be infer that rainfall totals in the months of greatest convective warming are decreasing in recent years due to the reduction in the number of rainy days or extreme rainfall.
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