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| Titel |
Climate variability over the last 92 ka in SW Balkans from analysis of sediments from Lake Prespa |
| VerfasserIn |
K. Panagiotopoulos, A. Böhm, M. J. Leng, B. Wagner, F. Schäbitz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 2 ; Nr. 10, no. 2 (2014-03-27), S.643-660 |
| Datensatznummer |
250116943
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| Publikation (Nr.) |
 copernicus.org/cp-10-643-2014.pdf |
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| Zusammenfassung |
| The transboundary Lake Prespa (Albania/former Yugoslav Republic of Macedonia/Greece) has been recognized as a
conservation priority wetland. The high biodiversity encountered in the
catchment at present points to the refugial character of this mountainous
region in the southwestern Balkans. A lake sediment core retrieved from a coring
location in the northern part of the lake was investigated through
sedimentological, geochemical, and palynological analyses. Based on
tephrochronology, radiocarbon and electron spin resonance (ESR) dating, and
cross correlation with other Northern Hemisphere records, the age model
suggests that the basal part of core Co1215 reaches back to 92 ka cal BP.
Here we present the responses of this mid-altitude site (849 m a.s.l.) to
climate oscillations during this interval and assess its sensitivity to
millennial-scale variability. Endogenic calcite precipitation occurred in
marine isotope stages (MIS) 5 and 1 and is synchronous with periods of
increased primary production (terrestrial and/or lacustrine). Periods of
pronounced phytoplankton blooms (inferred from green algae and
dinoflagellate concentrations) are recorded in MIS 5 and MIS 1 and suggest
that the trophic state and lake levels underwent substantial fluctuations.
Three major phases of vegetation development are distinguished: the forested
phases of MIS 5 and MIS 1 dominated by deciduous trees with higher
temperatures and moisture availability, the open landscapes of MIS 3 with
significant presence of temperate trees, and the pine-dominated open
landscapes of MIS 4 and MIS 2 with lower temperatures and moisture
availability. Our findings suggest significant changes in forest cover and
landscape openness, as well as in the properties of the vegetation belts
(composition and distribution) over the period examined. The study area most
likely formed the upper limit of several drought-sensitive trees (temperate
tree refugium) at these latitudes in the Mediterranean mountains. |
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