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O estudo da Temperatura de Superfície do Mar (SST) é de extrema importância para a devida
compreensão dos processos físicos do oceano e da interação deste com a atmosfera. Desde há vários
séculos que as medições de SST são efetuadas e podem ser obtidas quer através de métodos in-situ
ou, mais recentemente, métodos de deteção remota. Ambos os tipos têm vantagens e limitações
pelo que a utilização conjunta das suas medições se torna particularmente benéfica, tal como é o
caso da validação dos produtos de SST obtidos por via remota. Mais ainda, zonas com uma grande
diversidade de regimes oceanográficos tal como a ZEE (Zona Económica Exclusiva) de Portugal,
pelas características que possuem, podem beneficiar desta mesma análise.
Neste estudo é apresentada uma avaliação da qualidade do produto ESA SST CCI, através da
comparação com dados in-situ, recolhidos por 15 boias costeiras da ZEE de Portugal. Pretende-se
assim analisar a capacidade do produto em captar a variabilidade temporal e espacial da SST,
através do estudo das respetivas séries temporais, da análise sazonal, e de diversos regimes de
velocidade do vento.
Os resultados obtidos neste estudo mostram que o produto é mais preciso em oceano aberto do que
em regiões mais próximas da costa; a análise sazonal mostrou que o produto é mais preciso nos
meses de inverno e, por fim, a análise do campo do vento mostrou uma maior precisão em regimes
de maiores velocidades. A análise realizada neste estudo mostrou as vantagens resultantes da
aplicação conjunta de medições de SST obtidas por via remota e in-situ.
The study of Sea Surface Temperature (SST) is extremely important, as it is fundamental to a proper understanding of the physical processes of the ocean and its interaction with the atmosphere. SST measurements have been made for centuries and can be obtained either by in-situ methods or, more recently, by remote methods; both types have advantages and limitations, so using their measurements together is particularly beneficial, as is the case with validating remotely obtained SST products. In addition, areas with a great diversity of oceanographic regimes, such as the EEZ (Exclusive Economic Zone) of Portugal, can benefit from this analysis due to their characteristics. This study assesses the quality of the ESA SST CCI climate product by comparing it with in-situ data collected by 15 coastal buoys in Portugal's EEZ, with a view to evaluating the product's ability to capture the temporal and spatial variability of the SST, by studying the respective time series, analysing the seasonality and different wind speed regimes. The results obtained in this study show that the product is more accurate in the open ocean than in regions closer to the coast; the seasonal analysis showed that the product is more accurate in the winter months, and, finally, the analysis of the wind field showed greater accuracy in higher speed regimes. The analysis performed in this study showed the advantages resulting from the joint application of SST measurements obtained by remote sensing and in-situ.
The study of Sea Surface Temperature (SST) is extremely important, as it is fundamental to a proper understanding of the physical processes of the ocean and its interaction with the atmosphere. SST measurements have been made for centuries and can be obtained either by in-situ methods or, more recently, by remote methods; both types have advantages and limitations, so using their measurements together is particularly beneficial, as is the case with validating remotely obtained SST products. In addition, areas with a great diversity of oceanographic regimes, such as the EEZ (Exclusive Economic Zone) of Portugal, can benefit from this analysis due to their characteristics. This study assesses the quality of the ESA SST CCI climate product by comparing it with in-situ data collected by 15 coastal buoys in Portugal's EEZ, with a view to evaluating the product's ability to capture the temporal and spatial variability of the SST, by studying the respective time series, analysing the seasonality and different wind speed regimes. The results obtained in this study show that the product is more accurate in the open ocean than in regions closer to the coast; the seasonal analysis showed that the product is more accurate in the winter months, and, finally, the analysis of the wind field showed greater accuracy in higher speed regimes. The analysis performed in this study showed the advantages resulting from the joint application of SST measurements obtained by remote sensing and in-situ.
Descrição
Tese de mestrado, Ciências Geofísicas, 2024, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
Dados in-situ Deteção Remota Sazonalidade SST Vento Teses de mestrado - 2024
