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Publication
E o clima deu à costa!: impacto do "Pequeno Ótimo Climático" e da "Pequena Idade do Gelo" na formação e evolução da laguna de Aveiro (Portugal)
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Advisor(s)
Abstract(s)
À medida que recuamos no tempo histórico torna-se
cada vez mais complexa a tentativa de reconstituição
de climas passados e seu impacte nos ecossistemas.
Neste estudo faz-se uma correlação entre a irradiação
solar e o crescimento da flecha arenosa (restinga) que
permitiu a formação da laguna de Aveiro. Sabendo-se
da controvérsia em torno da utilização de um só indicador (proxy) para a definição de fenómenos tão complexos como são o das oscilações climáticas, sempre que
possível, estabelece-se um nexo entre as taxas médias
de progressão anual da restinga com os dados conhecidos da NAO (North Atlantic Oscillation) e dos grandes
períodos climáticos. Detecta-se existir um ritmo mais
intenso de desenvolvimento durante o “Pequeno Ótimo
Climático” que é amortecido para uma velocidade de
cerca de metade na Pequena Idade do Gelo.
As we retreat into historical time, the attempt to reconstruct past climates and their impact in the ecosystems becomes increasingly complex. This study makes a correlation between solar radiation and the growth of a sandy spit that allowed the formation of the Aveiro’s lagoon. Knowing the controversy surrounding the use of a single proxy for the definition of phenomena as complex as climate fluctuations, whenever possible, a link is established between the average rates of annual progression of the sandy spit with the known data of the NAO (North Atlantic Oscillation) and the great climatic periods. A more intense pace of development is found during the Medieval Warm Period, that is fallen to a speed of about half during the Little Ice Age.
As we retreat into historical time, the attempt to reconstruct past climates and their impact in the ecosystems becomes increasingly complex. This study makes a correlation between solar radiation and the growth of a sandy spit that allowed the formation of the Aveiro’s lagoon. Knowing the controversy surrounding the use of a single proxy for the definition of phenomena as complex as climate fluctuations, whenever possible, a link is established between the average rates of annual progression of the sandy spit with the known data of the NAO (North Atlantic Oscillation) and the great climatic periods. A more intense pace of development is found during the Medieval Warm Period, that is fallen to a speed of about half during the Little Ice Age.
Description
Keywords
Clima Radiação solar Litoral norte português Morfodinâmica costeira Climate Solar radiation North coast Portuguese Coastal morph dynamics
Pedagogical Context
Citation
Publisher
FURG