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Variabilidade climática e ações antrópicas como impulsionadores da atividade eólica durante o último milénio no Sudoeste da Europa: um caso de estudo da costa portuguesa
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Orientador(es)
Resumo(s)
The building of dunes and sand drifts along the European coastline are
generally related to climatic variability and sea-level fluctuation. The last phase of dunes
formation in south-western Europe coincides with the Little Ice Age (LIA) period characterized by pronounced climate variability. Historical sources retrieved from archives also
report sand-drift events along the Portuguese coast. The sand invaded many agricultural
fields, and settlements, forcing the inhabitants to move elsewhere. The article explores the
temporal relationships between sand drift occurrences and climate, as a principal trigger for
coastal dune migration. We used historical sources about sand-drift events as documentary
proxies to infer the past climate variability on the Portuguese coast. Three spatial scales of
climate variability were considered: i) the global climatic variability induced by the cold
abrupt events over the last Millennium (LIA); ii) the regional (mesoscale) climate variability
(NAO index), and iii) the local climate variability (extreme meteorological events). The
paleoclimatic interpretation indicates that drifts in Portugal are related to both NAO modes,
providing new insights into coastal dunes dynamics, as a response to natural drivers. However, the analysis of human activity on the coast also allowed us to better understand the
relation of the local populations with their environments, highlighting those anthropogenic
actions caused an additional disturbance on coastal dune dynamics.
Descrição
Palavras-chave
Sand-drift events Climate fluctuation LIA NAO index variability Portugal
Contexto Educativo
Citação
Tudor, M., Ramos-Pereira, A. & Gaspar de Freitas, J. (2021). Variabilidade climática e ações antrópicas como impulsionadores da atividade eólica durante o último milénio no Sudoeste da Europa: um caso de estudo da costa portuguesa. Finisterra, 56(118), 25–50. https://doi.org/10.18055/Finis21158
Editora
Universidade de Lisboa, Centro de Estudos Geográficos