| Title | Rapid climatic events as recorded in middle Weichselian thermokarst lake sediments |
| Author | Bohncke, S.J.P.; Bos, J.A.A.; Engels, S.; Heiri, O.; Kasse, C. |
| Author Affil | Bohncke, S.J.P., Vrije Universiteit, Department of Paleoclimatology and Geomorphology, Amsterdam, Netherlands. Other: Lehigh University; Royal Holloway, University of London, United Kingdom; Utrecht University, Netherlands |
| Source | Quaternary Science Reviews, 27(1-2), p.162-174, ; 8th INTIMATE international workshop, Iceland, Sept. 2005, edited by Z.C. Yu, W.Z. Hoek and J.J. Lowe. Publisher: Elsevier, International. ISSN: 0277- 3791 |
| Publication Date | Jan. 2008 |
| Notes | In English. 100 refs. GeoRef Acc. No: 300708 |
| Index Terms | carbon isotopes; climatic change; correlation; isotopes; lacustrine deposits; lake deposits; paleoclimatology; permafrost; Pleistocene; pollen; Quaternary deposits; radioactive isotopes; sediments; spectra; thermokarst; Germany--Reichwalde; Germany-- Sachsen; accelerator mass spectra; Arthropoda; C-14; carbon; Cenozoic; Central Europe; Chironomidae; climate change; climate forcing; Dansgaard-Oeschger cycles; Diptera; Endopterygota; Europe; Germany; gyttja; Insecta; Invertebrata; lacustrine environment; lake sediments; Mandibulata; Marine Isotope Stage 3; mass spectra; microfossils; miospores; Neoptera; paleoenvironment; paleotemperature; palynomorphs; Plantae; Pterygota; Quaternary; Reichwalde Germany; Sachsen Germany; upper Pleistocene; Weichselian |
| Abstract | From a Middle Weichselian sediment sequence in the opencast brown coal mine of Reichwalde (eastern Germany), a ~40 cm thick thermokarst gyttja deposit has been sampled. The AMS 14C dates, although at the limit of detection, indicate an early Middle Weichselian age of the gyttja. Pollen, botanical, and zoological (e.g. chironomids) macroremains have been analyzed. Botanical and chironomid taxa indicate warm climatic conditions in the bottom part of the sequence. For this lower part the botanical data suggest a minimum mean July temperature of 12-14°C. Following this, a cooling is indicated, coinciding with an increased clastic deposition in the lake. A return to permafrost conditions is reconstructed for the upper part of the sequence. The combined evidence strongly suggests a degradation of permafrost due to increased warming in response to a D/O event as a forcing factor for the thermokarst lake formation. |
| URL | http://hdl.handle.net/10.1016/j.quascirev.2007.09.017 |
| Publication Type | conference paper or compendium article |
| Record ID | 64005156 |