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Advisor(s)
Abstract(s)
Este estudo foca-se na análise da variabilidade espácio-temporal da temperatura
da superfície do mar (TSM) na costa de Portugal Continental dispondo de dados da TSM
recolhidos in situ por sete boias (boias ondógrafo e meteo-oceanográficas) operadas
pelo Instituto Hidrográfico, distribuídas ao longo e ao largo da costa Portuguesa. A
motivação para este estudo surge no âmbito da análise de um dos parâmetros
fundamentais no estudo do oceano, a TSM, considerando as mais recentes temáticas
como é o caso das alterações climáticas, e como estas poderão estar a influenciar a
dinâmica dos oceanos e os seus ecossistemas. Os períodos de estudo analisados para as
boias ondógrafo foram cerca de 20 anos, e para as boias meteo-oceanográficas entre 5
e 10 anos. Os dados, depois de tratados e agregados, foram analisados mediante o
cálculo de médias diárias, mensais e anuais. Através das séries temporais construída s
estudou-se a variabilidade sazonal e interanual da TSM, com particular foco na
caracterização climática das regiões de Leixões, Sines e Faro, tendo em consideração
evidências de eventos de afloramento costeiro (upwelling) e anomalias térmicas.
Observou-se um padrão oceânico quasi-periódico da TSM (2-3 anos), e que a TSM no
território português descreve um padrão sazonal. Verificou-se uma tendência para um
ligeiro aumento da TSM na região de Faro e um ligeiro decréscimo na região de Sines. A
análise da última década (2010-2019), revelou uma tendência para o decréscimo da TSM
em todo o território português, inclusive, entre as regiões costeiras e do largo. Este
estudo permitiu caracterizar o regime térmico da costa Portuguesa nas últimas décadas,
e verificar que a TSM não está, tendencialmente, a variar de igual forma na região de
Portugal Continental. É, no entanto, necessário aprofundar este estudo,
complementando com outras bases de dados (imagens satélite, flutuadores argo, etc.),
para obter conclusões mais robustas.
This study focuses on the analysis of the spatial-temporal variability of the sea surface temperature (SST) on the coast of mainland Portugal with SST data collected in situ by seven buoys (ondographic and meteo-oceanographic buoys) operated by the Portuguese Hydrographic Institute, distributed along and off the Portuguese coast. The motivation for this study comes from the analysis of one of the fundamental parameters in the study of the ocean, SST, considering the most recent themes such as climate change, and how these may be influencing the dynamics of the oceans and their ecosystems. The study periods analysed for the ondographic buoys were about 20 years, and for the meteoceanographic buoys between 5 and 10 years. The data, once processed and aggregated, were analysed by calculating daily, monthly and annual averages. Through the time series built, the seasonal and inter-annual variability of SST was studied, with particular focus on the climatic characterization of the regions of Leixões, Sines and Faro, taking into account evidence of upwelling and thermal anomalies. A quasi-periodic oceanic pattern of SST (2-3 years) was observed, and SST in the Portuguese territory describes a seasonal pattern. There was a tendency for a slight increase of SST in the Faro region and a slight decrease in the Sines region. The analysis of the last decade (2010-2019), revealed a tendency for a decrease of SST in the whole Portuguese territory, including between inshore and offshore regions. This study allowed to characterize the thermal regime of the Portuguese coast in recent decades, and to verify that SST is not tending to vary equally in the region of mainland Portugal. It is, however, necessary to deepen this study, complementing it with other databases (satellite images, argo floats, etc.), in order to obtain more robust conclusions.
This study focuses on the analysis of the spatial-temporal variability of the sea surface temperature (SST) on the coast of mainland Portugal with SST data collected in situ by seven buoys (ondographic and meteo-oceanographic buoys) operated by the Portuguese Hydrographic Institute, distributed along and off the Portuguese coast. The motivation for this study comes from the analysis of one of the fundamental parameters in the study of the ocean, SST, considering the most recent themes such as climate change, and how these may be influencing the dynamics of the oceans and their ecosystems. The study periods analysed for the ondographic buoys were about 20 years, and for the meteoceanographic buoys between 5 and 10 years. The data, once processed and aggregated, were analysed by calculating daily, monthly and annual averages. Through the time series built, the seasonal and inter-annual variability of SST was studied, with particular focus on the climatic characterization of the regions of Leixões, Sines and Faro, taking into account evidence of upwelling and thermal anomalies. A quasi-periodic oceanic pattern of SST (2-3 years) was observed, and SST in the Portuguese territory describes a seasonal pattern. There was a tendency for a slight increase of SST in the Faro region and a slight decrease in the Sines region. The analysis of the last decade (2010-2019), revealed a tendency for a decrease of SST in the whole Portuguese territory, including between inshore and offshore regions. This study allowed to characterize the thermal regime of the Portuguese coast in recent decades, and to verify that SST is not tending to vary equally in the region of mainland Portugal. It is, however, necessary to deepen this study, complementing it with other databases (satellite images, argo floats, etc.), in order to obtain more robust conclusions.
Description
Keywords
Portugal Instituto Hidrográfico Boias Temperatura da superfície do mar Upwelling