Arid and humid phases in central Italy during the Late Pleistocene revealed by the Lake Trasimeno ostracod record

A multiproxy approach in a sediment core from Lake Trasimeno has been used to reconstruct the climate history of central Italy during the Late Pleistocene to Early Holocene period (ca. 47,000–9,000 cal yr B.P.). Ostracod assemblages and sedimentological data (lithology and carbonate content) have...

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Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Marchegiano, Marta, Francke, Alexander, Gliozzi, Elsa, Ariztegui, Daniel
Format: Article in Journal/Newspaper
Language:English
Published: 2018
Subjects:
Mediterranean area
Multivariate analyse
Paleoclimate
Paleocology
Paleoenvironment
Oceanography
Ecology
Evolution
Behavior and Systematic
Earth-Surface Processe
Paleontology
Greenland
High Lake
NGRIP
Online Access:http://hdl.handle.net/11590/330110
https://doi.org/10.1016/j.palaeo.2017.09.033
http://www.sciencedirect.com/science/journal/00310182/319
Description
Summary:A multiproxy approach in a sediment core from Lake Trasimeno has been used to reconstruct the climate history of central Italy during the Late Pleistocene to Early Holocene period (ca. 47,000–9,000 cal yr B.P.). Ostracod assemblages and sedimentological data (lithology and carbonate content) have been used to infer past hydrological changes in the area. Ostracods were analyzed throughout the core using diversity indexes and multivariate statistic analyses (Cluster and PCA). Three main associations linked to lake level and salinity variations were recognized: 1) the C. torosa association, indicating permanent lacustrine conditions with high lake levels and low salinities; 2) the S. aculeata association, linked to very shallow/temporary waters with higher salinity conditions; and 3) the S. aculeata-E. mareotica association pointing to temporary water conditions and the highest salinities. Furthermore, the presence of C. fuscata and L. blankenbergensis during wide parts of the Late Pleistocene indicates temperatures lower than present days. Alternations of these three ostracod associations compares well with the oxygen isotope curve from Greenland (NGRIP) and are thus interpreted as climatically driven. At the Holocene transition (Termination 1), the ostracod associations indicate a delay in the increasing warming and humidity with respect to the NGRIP temperature record.

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