A multi-proxy stalagmite record indicates a shift in forcing of twentieth century drought events in Normandy

Autor: Ingrid Bejarano-Arias, Carole Nehme, Sebastian F. M. Breitenbach, Monica Ionita, James Baldini, Edwige Pons-Branchu, Sevasti Modestou, Stuart Umbo, Damase Mouralis
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Scientific Reports, Vol 14, Iss 1, Pp 1-11 (2024)
Druh dokumentu: article
ISSN: 2045-2322
15284514
DOI: 10.1038/s41598-024-77674-2
Popis: Abstract Drought events are increasingly impacting Europe. The study of past droughts helps disentangle the different factors that trigger hydrological drought, helping to forecast future drought severity. Here we identify the historical drought events of the twentieth and twenty-first centuries in geochemical records of a stalagmite from Caumont cave in Northern France and develop a mechanistic understanding of their root causes. Subannually-resolved stable carbon isotope (δ13C) and trace element data are directly compared with historical climatic records. δ13C, Mg, and Sr peaks align well with most of the historical drought events of the twentieth and twenty-first centuries. The comparison reveals a good correspondence between summer effective rainfall and δ13C, Mg, and Sr concentrations. Further comparison of geochemical records with the precipitation-evapotranspiration index (SPEI) reveals a change in the drought forcings for the past two decades. During most of the twentieth century, droughts appear driven by a pluvial regime, whereas since the late 1990s, drought was driven by higher evapotranspiration due to increased temperature.
Databáze: Directory of Open Access Journals
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