Influence of mesoscale atmospheric forcing on mean sea level at Piraquara, RJ
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The work refers to variations of the mean sea level (MSL) in Piraquara (RJ) due to mesoscale atmospheric disturbances in the South and Southeast Brazil oceanic area. The sea level data were submitted to a verification and consistence process, and then they were validated with the help of predicted levels by the software Pacmaré (FRANCO, 1992). For the pressure and wind velocities, the NCEP re-analysis data was used. Thompson's low pass optimizable filter was used to remove high frequencies in the data. Differently to the habitual use of quarters of year in climatologic studies, in this work partitions of the year centered in solstice and equinox were considered. About the results of the statistical analysis in the time domain, it was seen that MSL response has time delays with respect to atmospheric pressure and wind stress. The spectral analysis, in the frequency domain showed that during the equinox centered days the high peaks of energy are in relatively lower frequenc.....