Arid and humid phases in central Italy during the Late Pleistocene revealed by the Lake Trasimeno ostracod record
| Autor: | Daniel Ariztegui, Alexander Francke, Marta Marchegiano, Elsa Gliozzi |
|---|---|
| Přispěvatelé: | Analytical, Environmental & Geo-Chemistry, Chemistry, Marchegiano, Marta, Francke, Alexander, Gliozzi, Elsa, Ariztegui, Daniel |
| Rok vydání: | 2018 |
| Předmět: |
010506 paleontology
Paleoclimate 010504 meteorology & atmospheric sciences Pleistocene Oceanography Mediterranean area 01 natural sciences Paleocology Ostracod Paleoclimatology Ecology Evolution Behavior and Systematics Holocene 0105 earth and related environmental sciences Earth-Surface Processes Temperature record Multivariate analyse biology Paleontology biology.organism_classification Ecology Evolution Behavior and Systematic Arid Paleoenvironment Salinity Earth-Surface Processe Period (geology) Geology |
| Zdroj: | Palaeogeography, Palaeoclimatology, Palaeoecology. 490:55-69 |
| ISSN: | 0031-0182 |
| DOI: | 10.1016/j.palaeo.2017.09.033 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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