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. Recovery and analysis of sea level data from the ports of Belem, Recife, Santos and Cananeia, Brazil, in a decadal time scale, allow determining the seasonal, annual and decadal variability of mean sea level and tidal components, such as M 2 and S 2, which are associated to a probably local phenomena not yet clearly understood and established. On the other hand, trending values of (relative) mean sea level of these ports agree with the variability observed up to now in several ports around the world; the mean sea level trend in Cananeia, about 40 cm/century, may be occurring along the entire Brazilian Coast. Keywords: Brazilian coast, relative mean sea level, tidal components, decadal trends, Belem, Recife, Santos, Cananeia. RESUMO. A recuperacao e analise de dados de niveldo mar dos portos de Belem, Recife, Santos e Cananeia, Brasil, em escala de tempo decadal, permitem determinar variabilidades sazonais, anuais e decadais do nivel medio do mar e das componentes de mare, como M 2 e S 2, as quais sao associadas a fenomenos, provavelmente locais, ainda nao claramente entendidos e estabelecidos. Por outro lado, os valores das tendencias de variacoes do nivel medio (relativo) do mar de longo termo desses portos estao em consonância com as variabilidades ate agora registradas em varios portos em todo o mundo; a tendencia do nivel medio do mar no porto de Cananeia, com cerca de 40 cm/seculo, pode estar ocorrendo em toda costa brasileira. Palavras-chave: costa brasileira, nivel medio relativo do mar, componentes de mare, tendencias decadais, Belem, Recife, Santos, Cananeia.

LONG-TERM VARIABILITY OF TIDAL AND MEAN SEA LEVEL COMPONENTS ON THE BRAZILIAN COAST