Preboreal oscillation in the light of multiproxy analyses—Early Holocene in Lake Jelonek (North Poland)

Author:

Kramkowski Mateusz1ORCID,Filbrand-Czaja Anna2,Zawisza Edyta3,Rzodkiewicz Monika4,Kotrys Bartosz5,Mirosław-Grabowska Joanna3,Błaszkiewicz Mirosław1,Szewczyk Krzysztof6,Słowiński Michał6ORCID

Affiliation:

1. Department of Environmental Resources and Geohazards, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Poland

2. Department of Geobotany and Landscape Planning, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Poland

3. Institute of Geological Sciences, Polish Academy of Sciences, Poland

4. Adam Mickiewicz University, Institute of Geoecology and Geoinformation, Poland

5. Polish Geological Institute - National Research Institute, Pomeranian Branch in Szczecin, Poland

6. Department of Past Landscape Dynamics, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Poland

Abstract

In this work, we studied the course of climatic fluctuations at the beginning of the Preboreal period using multiproxy analyses (Chironomidae, pollen, diatoms, Cladocera, stable isotopes, macrocharcoal, microlithofacial) combined with varve chronology of sediments. The results showed a decrease in the mean July temperature and stronger continentalism followed by climate wetting at the start of the Preboreal period. This was reflected in the remodeling of the vegetation cover from birch forests to more open spaces with grass vegetation dominance, as well as that of the species composition of Cladocera and diatoms, and the high variability of isotopic composition. In addition, the results showed the impact of local conditions (fires and relict permafrost) on the amplification of environmental responses due to climate cooling. The environmental transformations presented here correspond temporally to the changes that are well documented in other parts of Europe as the Preboreal Oscillation.

Publisher

SAGE Publications

Subject

Paleontology,Earth-Surface Processes,Ecology,Archeology,Global and Planetary Change

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