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The record precipitation and flood event in Iberia in December 1876: description and synoptic analysis
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Orientador(es)
Resumo(s)
The first week of December 1876 was marked by extreme weather conditions that
affected the south-western sector of the Iberian Peninsula (IP), leading to an all-time
record flow in two large international rivers. As a direct consequence, several Portuguese
and Spanish towns and villages located in the banks of both rivers suffered serious
flood damage on 7 December 1876. These unusual floods were amplified by the
preceding particularly autumn wet months, with October 1876 presenting extremely high
precipitation anomalies for all western Iberia stations. Two recently digitized stations in
Portugal (Lisbon and Evora), present a peak value on 5 December 1876. Furthermore,
the values of precipitation registered between 28 November and 7 December were
so remarkable that, the episode of 1876 still corresponds to the maximum average
daily precipitation values for temporal scales between 2 and 10 days. Using several
different data sources, such as historical newspapers of that time, meteorological data
recently digitized from several stations in Portugal and Spain and the recently available
20th Century Reanalysis, we provide a detailed analysis on the socio-economic impacts,
precipitation values and the atmospheric circulation conditions associated with this event.
The atmospheric circulation during these months was assessed at the monthly, daily and
sub-daily scales. All months considered present an intense negative NAO index value, with
November 1876 corresponding to the lowest NAO value on record since 1865. We have
also computed a multivariable analysis of surface and upper air fields in order to provide
some enlightening into the evolution of the synoptic conditions in the week prior to the
floods. These events resulted from the continuous pouring of precipitation registered
between 28 November and 7 December, due to the consecutive passage of Atlantic
low-pressure systems fuelled by the presence of an atmospheric-river tropical moisture
flow over central Atlantic Ocean.
Descrição
Palavras-chave
Natural hazard Atmospheric river Atlantic storms NAO Floods Extremes precipitation
Contexto Educativo
Citação
Trigo, R. M., Varino, F., Ramos, A. M., Valente, M. A., Zêzere, J. L., Vaquero, J. M., & Russo, A. (2014). The record precipitation and flood event in Iberia in december 1876: description and synoptic analysis. Frontiers in Earth Science, 2. https://doi.org/10.3389/feart.2014.00003
Editora
Frontiers