A Last Interglacial record of environmental changes from the Sulmona Basin (central Italy)

• Main Authors: Regattieri, Eleonora, Giaccio, Biagio, Nomade, Sebastien, Francke, Alexander, Vogel, Hendrik, Drysdale, Russell N., Perchiazzi, Natale, Wagner, Bernd, Gemelli, Maurizio, Mazzini, Ilaria, Boschi, Chiara, Galli, Paolo, Peronace, Edoardo
• Format: Article in Journal/Newspaper
• Language: English
• Published: ELSEVIER SCIENCE BV 2017
• Subjects: ddc:no; North Atlantic
• Online Access: https://kups.ub.uni-koeln.de/23388/

Here we present a multiproxy record (delta C-13, delta O-18, major and minor element composition, mineralogy, and low resolution biogenic silica content) from a lacustrine succession in the Sulmona Basin, central Italy. Based on previous tephrochronological constraints and a new Ar-40/Ar-39 dating of a tephra matching the widespread X-6 tephra, the record spans the ca. 129-92 ka period and documents at sub-orbital scale the climatic and environmental changes over the Last Interglacial and its transition to the Last Glacial period. The 6180 composition is interpreted as a proxy for the amount and seasonality of local precipitation, whereas variations in elemental and mineralogical composition are inferred to reflect climatic-driven changes in clastic sediment input. The observed variations are consistent among the different proxies, and indicate that periods of reduced precipitation were marked by enhanced catchment erosion, probably due to a reduction in vegetation cover. The first part of the Last Interglacial shows the most negative delta O-18 values. Comparison with pollen records from the Mediterranean suggests a greater seasonality of the precipitation at this time. At millennial-to-centennial time scales, comparison of the Sulmona record with speleothem delta O-18 records from central Italy highlights a highly coherent pattern of hydrological evolution, with enhanced variability and similar events of reduced precipitation consistently recorded by each isotope record. The observed intra-interglacial variability can potentially be linked, within the uncertainties associated with each age model, to similar variations observed in sea-surface temperature records from the Mediterranean and the North Atlantic, suggesting a link between Mediterranean hydrology and North Atlantic temperature and circulation patterns that persists during periods of low ice volume. (C) 2017 Elsevier B.V. All rights reserved.