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Understanding past climatic and hydrological variability in the Mediterranean from Lake Prespa sediment isotope and geochemical record over the last glacial cycle. (Articolo in rivista)

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Understanding past climatic and hydrological variability in the Mediterranean from Lake Prespa sediment isotope and geochemical record over the last glacial cycle. (Articolo in rivista) (literal)

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Leng M. [1, 2]; Wagner B. [3]; Boehm A [3];, Panagiotopoulos K. [4]; Vane C. [5]; Snelling A. [2]; Haidon C. [1]; Woodley E. [2]; Vogel H. [3, 6] Zanchetta G. [7, 8, 9] Baneschi I. [8] (2013)
Understanding past climatic and hydrological variability in the Mediterranean from Lake Prespa sediment isotope and geochemical record over the last glacial cycle.
in Quaternary science reviews; Elsevier, Oxford (Regno Unito)
(literal)

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Leng M. [1, 2]; Wagner B. [3]; Boehm A [3];, Panagiotopoulos K. [4]; Vane C. [5]; Snelling A. [2]; Haidon C. [1]; Woodley E. [2]; Vogel H. [3, 6] Zanchetta G. [7, 8, 9] Baneschi I. [8] (literal)

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[1] Department of Geology, University of Leicester, Leicester LE1 7RH, UK [2] NERC Isotope Geosciences Laboratory (NIGL), British Geological Survey, Keyworth, Nottingham NG12 5GG, UK [3] Institute for Geology and Mineralogy, University of Cologne, 50674 Köln, Germany [4] Seminar of Geography and Education, University of Cologne, Gronewaldstraße 2, 50931 Köln, Germany [5] British Geological Survey, Keyworth, Nottingham NG12 5GG, UK [6]Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science, Umeå University, c/o Abisko Naturvetenskapliga Station, SE-981 07 Abisko, Sweden [7] Dipartimento di Scienze della Terra, University of Pisa, Via S. Maria 53, 56126 Pisa, Italy [8] Istituto di Geoscienze e Georisorse-CNR (IGG-CNR), Via Moruzzi 1, 56124 Pisa, Italy [9] INGV sez. Pisa, Via della Faggiola 32, 56124 Pisa, Italy (literal)

Titolo

Understanding past climatic and hydrological variability in the Mediterranean from Lake Prespa sediment isotope and geochemical record over the last glacial cycle. (literal)

Abstract

Here we present stable isotope and geochemical data from Lake Prespa (Macedonia/Albania border) over the Last Glacial cycle (Marine Isotope Stages 5-1) and discuss past lake hydrology and climate (TIC, oxygen and carbon isotopes), as well as responses to climate of terrestrial and aquatic vegetation (TOC, Rock Eval pyrolysis, carbon isotopes, pollen). The Lake Prespa sediments broadly fall into 5 zones based on their sedimentology, geochemistry, palynology and the existing chronology. The Glacial sediments suggest low supply of carbon to the lake, but high summer productivity; intermittent siderite layers suggest that although the lake was likely to have mixed regularly leading to enhanced oxidation of organic matter, there must have been within sediment reducing conditions and methanogenesis. MIS 5 and 1 sediments suggest much more productivity, higher rates of organic material preservation possibly due to more limited mixing with longer periods of oxygen-depleted bottom waters. We also calculated lakewater ?18O from siderite (authigenic/Glacial) and calcite (endogenic/Holocene) and show much lower lakewater ?18O values in the Glacial when compared to the Holocene, suggesting the lake was less evaporative in the Glacial, probably as a consequence of cooler summers and longer winter ice cover. In the Holocene the oxygen isotope data suggests general humidity, with just 2 marked arid phases, features observed in other Eastern and Central Mediterranean lakes. (literal)

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