Solar influence and hydrological variability during the Holocene from a speleothem annual record (Molinos Cave,NE Spain) |
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| Authors: | Arsenio Muñoz Miguel Bartolomé Alicia Muñoz Carlos Sancho Ana Moreno John C Hellstrom Mª Cinta Osácar Isabel Cacho |
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| Institution: | 1. Department of Earth Sciences, University of Zaragoza, C? Pedro Cerbuna 12, Zaragoza, Spain;2. Department of Geoenvironmental Processes and Global Change, Pyrenean Institute of Ecology‐CSIC, Zaragoza, Spain;3. School of Earth Sciences, University of Melbourne, Parkville, Vic., Australia;4. Department of Stratigraphy, Palaeontology and Marine Geosciences, University of Barcelona, Barcelona, Spain |
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| Abstract: | We present a multi‐proxy approach to reconstructing Holocene climate conditions in northeastern Spain based on an excellent correlation among the lamina thickness, colour parameters and isotope (δ18O and δ13C) variations recorded in a speleothem. An age model constructed from five U/Th dates and annual lamina counting suggests that the uppermost 14.7 cm of the MO‐7 stalagmite grew between 7.2 and 2.5 ka before present but experienced a growth hiatus from 4.9 to 4.3 ka. Three spectral analysis methods were applied to 11 time series. The results reveal common solar periodicities on decennial (Gleissberg cycle) and centennial (De Vries‐Suess cycle) scales. The onset of Holocene carbonate precipitation in the MO‐7 stalagmite appears to be associated with a cold, wet period, whereas the hiatus and the end of growth are related to warm, dry periods. This environmental trend fits well within the regional Holocene climate. |
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