Precipitation in Salvador City: Temporal Variability and Classification in Quantis

Abstract

This work aims to contribute to the study of rainfall in the city of Salvador – BA. The total monthly precipitation obtained from the National Institute of Meteorology in the period of 51 years (1961-2011) substantiate this research. The rainfall variability was analyzed with emphasis on determining the classes of precipitation in the annual, quarter and monthly scales. Nonparametric significance tests of Mann-Kendall and slope estimates by the method of Sen Curvature were used. At for rainfall classification, the method of Percentiles was adopted. For the annual review, the results showed that 1964 (1961) can be classified as “very wet” (“very dry”). The analysis of the wettest quarter AMJJ (drier ASON), the year 1971 (1980) was the most extreme “very wet” (“very dry”). In the monthly analysis, the event that had the highest volume of rainfall occurred in April 1984 with 889.8 mm records. Trend analysis showed a reduction in the rain volume on an annual scale, however, statistically not significant. Much of the analyzed events occurred with no conditions equatorial Pacific Ocean , and / or South Atlantic Tropical favorable (unfavorable) to increase (decrease) the volume of rain in the area in study, based on a qualitative analysis.

Keywords:
precipitation; extreme event; Northeastern Brazil