Banca de QUALIFICAÇÃO: MURILO ROCHA DE SOUZA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MURILO ROCHA DE SOUZA
DATE: 31/08/2026
TIME: 08:30
LOCAL: Natal RN
TITLE:

Assessment of Meteorological Tides at Multiple Sites Along the Brazilian Coast

KEY WORDS:

Sea level; hamonical analysis; coastal winds

PAGES: 40
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Meteorologia
SUMMARY:

The meteorological tide corresponds to the portion of sea level variability primarily associated with atmospheric forcing, particularly wind and atmospheric pressure, and may represent an important risk factor for coastal areas. This study aimed to identify, quantify, and compare the occurrence and magnitude of the meteorological tide in Natal (RN) and São Francisco do Sul (SC), two locations subject to distinct atmospheric, oceanographic, and geomorphological conditions. Sea level time series from the Brazilian National Oceanographic Data Bank (BNDO) were used, covering the periods from June 2023 to May 2024 for Natal and from December 2009 to November 2010 for São Francisco do Sul. The astronomical tide component was obtained through harmonic analysis using the UTide package, allowing the meteorological tide to be calculated as the difference between the observed level and the reconstructed astronomical tide. Subsequently, the seasonal variability of the meteorological tide and its relationship with wind direction and atmospheric pressure were analyzed using Pearson’s correlation coefficient. Results indicated a predominance of the semidiurnal component in both locations, though with differences in harmonic structure. In Natal, the M₂ constituent accounted for 84.68% of tidal energy, whereas in São Francisco do Sul M₂ and S₂ represented 49.18% and 21.98%, respectively, with a greater contribution from shallow-water harmonics. The meteorological tide exhibited relatively small amplitudes in Natal, with extreme events of approximately −25 cm and +13 cm, while in São Francisco do Sul events reached approximately −60 cm and +80 cm. Correlations between the meteorological tide and atmospheric variables were generally stronger in São Francisco do Sul, with a positive association with winds from the southern and western quadrants and a negative association with winds from the northern and eastern quadrants. In Natal, the strongest correlations occurred during summer, particularly for winds from the northern and southern quadrants, as well as atmospheric pressure. These findings highlight that, although the astronomical tide is the main component of sea level variability in both locations, meteorological influence is significantly more pronounced in São Francisco do Sul, reflecting the geographic and meteorological differences between the two regions and the consequent differentiated impact of atmospheric conditions on the studied coastal systems.

COMMITTEE MEMBERS:
Presidente - 2276514 - MARCIO MACHADO CINTRA
Interno - 1858120 - DAVID MENDES
Externa ao Programa - 1303697 - FERNANDA MARIA DE SOUZA - UFRN