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Publication
Impacto do pequeno ótimo climático na formação e exploração da laguna de Aveiro (Portugal)
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| 1.14 MB | Adobe PDF |
Advisor(s)
Abstract(s)
Por volta do século VII, ocorreu uma ligeira inversão da
tendência de arrefecimento global, proporcionando uma
melhoria climática que, na Europa Ocidental, se estenderia até
cerca do ano de 1300. Este período, conhecido como
“Pequeno Ótimo Climático”, ocasionou alterações de
oscilação térmica e de precipitação, com consequências no
aumento demográfico e intensificação das atividades
antrópicas, designadamente pela maior e melhor exploração
das atividades económicas. Durante esta fase, elementos
naturais e antrópicos contribuíram para dinâmicas de acreção
sedimentar no litoral noroeste português. Nas reentrâncias
marítimas existentes ao longo da costa, os sedimentos
carreados pelas correntes de deriva litoral, formaram restingas
arenosas, constituindo ambientes lagunares. Tal foi o caso de
uma restinga que, enraizada imediatamente a sul de Espinho,
veio a constituir o limite ocidental da laguna de Aveiro. A esta
transformação física, agregase o ser humano enquanto agente
modelador do ambiente na execução de políticas de
estabilização de fronteiras, equilíbrio demográfico e criação
de novos espaços de atividade económica (com destaque para
o sal, bem essencial no equilíbrio da balança comercial com o
exterior); ou seja, medidas de organização do território
necessárias no decorrer da formação e consolidação da
identidade nacional portuguesa. Este estudo centrase numa
ampliação da análise histórica ambiental do espaço da laguna
de Aveiro, inserindoa no contexto das mudanças climáticas
verificadas no Pequeno Ótimo Climático e numa complexa
rede de interações bióticas e abióticas
Around the 7th century, there was a slight reversal of the global cooling trend, providing a climate improvement across Western Europe, which continued until the 1300. This period, known as the «Medieval Warm Period», caused temperature oscillations and precipitation changes, with consequences to the demographic growth and intensification of the anthropogenic activities, namely the increasing and more efficient exploitation of economic activities. During this phase, natural and humanmade elements contributed to dynamics of the sedimentary accretion on the northwest Portuguese coast. Along the existing coastline indentations, the sediments carried by coastal drift currents formed sandy spit, constituting lagoon environments. This was the case of a sandy spit originated immediately to the south of Espinho, which became the western limit of the Aveiro Lagoon. In parallel to the natural transformation of the space, humans acted as modeling agents as population grew and put into practice policies of borders stabilization and created new spaces of economic activity (with emphasis on salt, essential to the balance of trade export). These were connected to territorial organization policies during the formation and consolidation of the Portuguese national identity. This study focuses on a broad environmental history view of the Aveiro Lagoon territory, inserting it in the context of the climatic changes verified during the medieval climate optimum and in a complex network of biotic and abiotic interactions.
Around the 7th century, there was a slight reversal of the global cooling trend, providing a climate improvement across Western Europe, which continued until the 1300. This period, known as the «Medieval Warm Period», caused temperature oscillations and precipitation changes, with consequences to the demographic growth and intensification of the anthropogenic activities, namely the increasing and more efficient exploitation of economic activities. During this phase, natural and humanmade elements contributed to dynamics of the sedimentary accretion on the northwest Portuguese coast. Along the existing coastline indentations, the sediments carried by coastal drift currents formed sandy spit, constituting lagoon environments. This was the case of a sandy spit originated immediately to the south of Espinho, which became the western limit of the Aveiro Lagoon. In parallel to the natural transformation of the space, humans acted as modeling agents as population grew and put into practice policies of borders stabilization and created new spaces of economic activity (with emphasis on salt, essential to the balance of trade export). These were connected to territorial organization policies during the formation and consolidation of the Portuguese national identity. This study focuses on a broad environmental history view of the Aveiro Lagoon territory, inserting it in the context of the climatic changes verified during the medieval climate optimum and in a complex network of biotic and abiotic interactions.
Description
Keywords
História ambiental Alterações climáticas Idade Média Ações antrópicas Environmental history Climate change Middle Ages Anthropic actions