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Holocene changes in precipitation seasonality in the western Mediterranean Basin: a multi-species approach using delta C-13 of archaeobotanical remains

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Issue date
2012
Author
Aguilera, Mònica
Ferrio Díaz, Juan Pedro
Pérez, G.
Araus Ortega, José Luis
Voltas Velasco, Jordi
Suggested citation
Aguilera, Mònica; Ferrio Díaz, Juan Pedro; Pérez, G.; Araus Ortega, José Luis; Voltas Velasco, Jordi; . (2012) . Holocene changes in precipitation seasonality in the western Mediterranean Basin: a multi-species approach using delta C-13 of archaeobotanical remains. Journal of Quaternary Science, 2012, vol. 27, núm. 2, p. 192-202. https://doi.org/10.1002/jqs.1533.
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Abstract
Precipitation has been of utmost importance in shaping the evolution of landscapes and human settlements in the Mediterranean. However, information on seasonal precipitation patterns through the Holocene is scarce. This study attempts to quantify the evolution of seasonal precipitation in the East Iberian Peninsula (5000 BC to AD 600) based on the carbon isotope composition (δ13C) of archaeobotanical remains. Data on Holm oak, Aleppo pine and small-grain cereals were combined, and precipitation was inferred from models relating present-day records to the δ13C of modern samples. Subsequently, charred grains were used as a proxy for ancient moisture during April–May, whereas oak and pine charcoals provided complementary rainfall estimates for September–December and January–August, respectively. The results reveal aridity changes throughout the Holocene in the western Mediterranean. Past spring–summer precipitation was consistently higher than at present. In contrast, autumn and early winter precipitation showed stronger fluctuations, particularly during the first millennium BC, and often exhibited values below those of the present. The high contribution of autumn precipitation to the annual water budget, typical of the present Mediterranean climate, was definitively established at the beginning of the current era. This study shows how a combination of species holding complementary environmental signals can contribute to a wider knowledge of local precipitation dynamics.
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http://hdl.handle.net/10459.1/49038
DOI
https://doi.org/10.1002/jqs.1533
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Journal of Quaternary Science, 2012, vol. 27, núm. 2, p. 192-202
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