Analysis of Tide Gauge Data at Baía de Paranaguá, PR
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This study analyzes tide gauge data from Paranaguá Bay, in Paraná, Brazil, aiming at characterizing tidal patterns using time series analysis. The methodology comprised the development and application of quality control procedures aiming at identifying and removing spurious data. These procedures resulted in a 9.86% reduction in the variance of harmonic constituents, enabling a substantially larger number of constituents to be resolved across several time series. Harmonic analysis was performed using the AstGeoTop and PACMARÉ software packages. Predominantly semidiurnal tidal behavior was identified at stations located in the middle and inner portions of the bay, whereas a semidiurnal regime with pronounced inequalities prevailed near the bay entrance. Based on the Reduction in Variance (RV) index, harmonic reconstruction accounted, on average, for 82% of observed sea level variability, indicating an approximate 18% contribution from meteorological forcing within the study area. The application of Thompson’s low-pass filter allowed the seasonal structure of tidal residuals to be delineated, revealing positive sea level anomalies during the first half of the year and negative anomalies during the second half. Although the available time series are not sufficiently long to support robust long-term assessments, the results underscore the importance of maintaining continuous tide gauge records for coastal research. Furthermore, the lack of complementary meteorological data constrained a fully integrated analysis of atmospheric forcing and its influence on regional sea level variability.
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