Please use this identifier to cite or link to this item:
Item metadata
Title: Long-term hydrological changes in northern Iberia (4.9–0.9 ky BP) from speleothem Mg/Ca ratios and cave monitoring (Ojo Guareña Karst Complex, Spain)
Authors: Cruz, Juncal A.
Turrero, María Jesús
Cáceres, Jorge Omar
Marín-Roldán, Alicia
Ortega Martínez, Ana Isabel
Garralón, Antonio
Sánchez Moreno, Lorenzo
Gómez González, Paloma
Muñoz-García, María Belén
Edwards, Richard Lawrence
Martín Chivelet, Javier
Keywords: Speleothem;Karst;Paleohydrology;Mg/Ca;Late Holocene;Iberia
Issue Date: Dec-2015
Publisher: Springer Verlag
Citation: Environmental Earth Sciences, 2015, 74 (12), 7741-7753
Abstract: An absolute-dated stalagmite from Kaite Cave (Ojo Guareña Karst Complex, N Spain) provides a nearly continuous, high-resolution record of a proxy of regional precipitation patterns through the 4.9–0.9 ka BP interval. This record is based on the Mg/Ca ratio of the calcite and its variation through the stalagmite stratigraphy, which is interpreted to be primarily driven by changes in precipitation amount. The calibration of the proxy is supported by the present-day monitoring carried out in the cave for the last 10 years, which reveals a robust inverse relationship between the inter-annual/inter-decadal variability of rainfall and the Mg concentration of dripwaters and precipitating speleothems. The record of paleoprecipitation, based on 2400 Mg/Ca measurements, shows strong variability at inter-annual to inter-decadal scales, and more subtle but significant changes at secular to millennial scales. This long-term paleohydrological evolution outlines five successive intervals with consistent trends, which are bounded by abrupt shifts in the regional precipitation. These shifts took place at 4.65, 4.2, 2.6, and 1.3 ka BP. Significantly, the intervals of maximum precipitation of the whole record (around 4.9–4.65, 2.6–2.45, and 1.3–1.1 ka BP) can be related with episodes of minimum solar activity and correlated with cold climatic events elsewhere.
ISSN: 1866-6280
DOI: 10.1007/s12665-015-4687-x
Type: Article
Appears in Collections:Geocronología y Geología

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.