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Climatic extremes in Portugal in the 1780s based on documentary and instrumental records
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Orientador(es)
Resumo(s)
The final stage of the Little Ice Age in Europe was characterised by strong climatic
variability. New documentary sources containing information referring to weather and climate are
used in this study to reconstruct and to describe climate conditions in Portugal during the 18th
century, mainly in the 1780s. Indexation of documentary data concerning hydric and thermal conditions
was based on C. Pfister’s methodology and early instrumental data (1780s and 1790s) were
used to verify the reconstruction. Precipitation and temperature were highly variable throughout
the 18th century: an alternation of extremely hot to extremely cold months was found. Very cold
years occurred mostly in the first 2 decades of the 18th century, but several other cold winters
were also detected. Precipitation information is far more frequent than for temperature, and
allowed yearly and seasonal indexations. The highest variability was de tected in the 1730s and
the 1780s. The early 1780s were very dry: during the winter and spring of 1781 and the spring of
1782 several drought episodes occurred, as confirmed by ‘pro-pluvia’ rogations. In contrast, heavy
precipitation prevailed from 1784 onwards. The year 1786 was the rainiest in Portugal, triggering
floods in northwestern and central Portugal. The year of 1788 was extremely wet and rainfall
caused floods along the largest rivers: Douro, Mondego and Tagus. A storm that struck North -
western Iberia between 23 and 24 February 1788 is analysed in detail.
Descrição
Palavras-chave
Climate variability Little Ice Age Extreme events Storm Portugal
Contexto Educativo
Citação
Fragoso, Marcelo, Marques, D, Santos, J.A., Alcoforado, Maria João, Amorim, I., Garcia, J.C., Silva, L., & Nunes, M. de F. (2015). Climatic extremes in Portugal in the 1780s based on documentary and instrumental records. Climate Research, 66(2), 141-159. https://doi.org/10.3354/cr01337
Editora
Inter-Research Science Center