Results of a sediment profile and water analyses from Lake Hancza in northeastern Poland

We investigated the sedimentary record of Lake Hancza (northeastern Poland) using a multi-proxy approach, focusing on early to mid-Holocene climatic and environmental changes. AMS 14C dating of terrestrial macrofossils and sedimentation rate estimates from occasional varve thickness measurements wer...

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Bibliographic Details
Main Authors: Lauterbach, Stefan, Brauer, Achim, Andersen, Nils, Danielopol, Dan L, Dulski, Peter, Hüls, Matthias, Milecka, Krystyna, Namiotko, Tadeusz, Plessen, Birgit, von Grafenstein, Ulrich, DecLakes participants
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
JH05
Lake Hancza
Suwazki-Augustów Lake District
northeastern Poland
PCUWI
Piston corer
UWITEC
Ice Sheet
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.743125
https://doi.org/10.1594/PANGAEA.743125
Description
Summary:We investigated the sedimentary record of Lake Hancza (northeastern Poland) using a multi-proxy approach, focusing on early to mid-Holocene climatic and environmental changes. AMS 14C dating of terrestrial macrofossils and sedimentation rate estimates from occasional varve thickness measurements were used to establish a chronology. The onset of the Holocene at c. 11600 cal. a BP is marked by the decline of Lateglacial shrub vegetation and a shift from clastic-detrital deposition to an autochthonous sedimentation dominated by biochemical calcite precipitation. Between 10000 and 9000 cal. a BP, a further environmental and climatic improvement is indicated by the spread of deciduous forests, an increase in lake organic matter and a 1.7% rise in the oxygen isotope ratios of both endogenic calcite and ostracod valves. Rising d18O values were probably caused by a combination of hydrological and climatic factors. The persistence of relatively cold and dry climate conditions in northeastern Poland during the first one and a half millennia of the Holocene could be related to a regional eastern European atmospheric circulation pattern. Prevailing anticyclonic circulation linked to a high-pressure cell above the retreating Scandinavian Ice Sheet might have blocked the influence of warm and moist Westerlies and attenuated the early Holocene climatic amelioration in the Lake Hancza region until the final decay of the ice sheet.

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