Análise espectral da temperatura da superfície do mar global no período de 1884 a 2014

Carlos Batista Silva, Maria Elisa Siqueira Silva

Resumo


O presente trabalho tem por objetivo verificar a evolução temporal da variância global da temperatura da superfície do mar, TSM, obtida pela aplicação da transformada de ondeletas aos dados mensais, e de sua tendência linear para o período de 1884 a 2014. A aplicação da técnica de ondeletas usando dados médios de TSM para várias áreas oceânicas permitiu a identificação de quatro faixas espectrais mais importantes: 1-12 meses, 1-2 anos, 2-4 anos 4-8 anos e 8-12 anos. Com a análise de tendência linear aplicada à variância da TSM em cada faixa espectral foi possível verificar que as oscilações mais rápidas, 1-12 meses, 1-2 anos e 2-4 anos, apresentam tendência linear negativa para o sinal global, enquanto as faixas caracterizadas por oscilações mais lentas, 4-8 anos e 8-12 anos, apresentam tendência positiva ao longo da série temporal. Estes resultados levam à sugestão de que fenômenos oceânicos caracterizados por oscilações mais rápidas estejam, ao longo do período considerado, transferindo energia para fenômenos oceânicos com oscilações mais lentas.

 


Palavras-chave


ondeletas, variância, tendência de TSM

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Referências


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ISSN: 2447-0945