Annually-resolved lake record of extreme hydro-meteorological events since AD 1347 in NE Iberian Peninsula

We present an annual reconstruction of extreme rainfall events interpreted from detrital layers and turbidites interbedded within a varved sediment record since the 14th century in Montcortés Lake (NE Spain, 1027 m a.s.l.). Clastic microfacies intercalated within the biochemical calcite varves were...

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Bibliographic Details
Published in:Quaternary science reviews 2014-06, Vol.93, p.77-90
Main Authors: Corella, J.P., Benito, G., Rodriguez-Lloveras, X., Brauer, A., Valero-Garcés, B.L.
Format: Article
Language:English
Subjects:
Climate change
Extreme rainfall
Freshwater
Lacustrine varves
Microfacies
Palaeofloods
Solar activity
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Summary:We present an annual reconstruction of extreme rainfall events interpreted from detrital layers and turbidites interbedded within a varved sediment record since the 14th century in Montcortés Lake (NE Spain, 1027 m a.s.l.). Clastic microfacies intercalated within the biochemical calcite varves were characterized and their depositional dynamics interpreted using high-resolution geochemical and sedimentological analyses. Annual number of detrital layers was compared against instrumental records of extreme daily rainfalls providing minimum rainfall thresholds and return periods associated to the identified types of clastic microfacies. Non-continuous detrital layers were deposited during rainfall events higher than 80 mm (>2-year return period) while graded detrital layers and turbidites were associated with higher magnitude rainfall events (>90 mm and >4-year return period). The frequency distribution of extreme hydro-meteorological events is not stationary and its pattern coincides with historical floods from the nearby Segre River. High frequency of heavy rainfalls occurred during the periods AD 1347–1400 and AD 1844–1894. A lower frequency of heavy rainfall was found during the periods AD 1441–1508, 1547–1592, 1656–1712, 1765–1822 and 1917–2012. The 20th century stands out as the longest interval within the studied period of very low number of extreme rainfall events. Variability in extreme rainfall events prior to the 20th century is in phase with solar activity, suggesting a mechanistic link in mid-latitude atmospheric circulation patterns that ceased during the 20th century. •An annual record of extreme rainfall from Lake Montcortès (NE Iberian Peninsula).•Quantitative rainfall threshold achieved for various detrital micro-facies.•Maxima in extreme rainfall events during the periods AD 1347–1400 and AD 1844–1894.•Minimum extreme rainfall at AD 1441–1508, 1547–1592, 1656–1712, 1765–1822, 1917–2012.•Possible link of extreme rainfall to solar variability prior the 20th century.
ISSN:0277-3791
1873-457X
DOI:10.1016/j.quascirev.2014.03.020