Abstract
Abstract. Tiefer See formed in a subglacial gully system at the end of the last glaciation in the northeast German lowlands. The lake has been selected as a focus site within the TERENO (Terrestrial Environmental Observatory) NE German observatory because it forms annual laminations (calcite varves) providing detailed information of past climate and environmental changes. Our research integrates palaeolimnology and limnology by combining high-resolution analyses of the sediment record with a comprehensive monitoring of the lake and its sedimentation processes since 2012. This allows evaluation of the observed effects of ongoing climate change in the context of the long-term history of the lake. The lacustrine sediment profile comprises the last 13 000 years and is dated by a multiple dating approach. The sedimentation is dominated by biochemical calcite formation and algal blooms. Detrital material from the catchment forms only a minor component even during times of increased human impact. Repeated changes between well-varved, poorly varved and homogeneous sediment intervals indicate that sedimentation processes in the lake are particularly sensitive to changes in lake circulation. The research at Tiefer See is embedded in ICLEA (https://www.iclea.de, last access: 2 August 2019) and BaltRap (https://www.io-warnemuende.de/projekt/167/baltrap.html, last access: 2 August 2019) projects.
Highlights
Tiefer See is part of the Klocksin lake chain, a subglacial gully system in a morainic terrain located in the natural park Nossentiner/Schwinzer Heide at 53◦35.5 N, 12◦31.8 E
A composite profile has been established from six cores which includes two minor gaps below 7.5 m depth in the early Holocene (Dräger et al, 2017)
The most recent period of varve preservation began in 1924 CE (Kienel et al, 2017) with the formation of calcite varves (Fig. 2b)
Summary
Tiefer See is part of the Klocksin lake chain, a subglacial gully system in a morainic terrain located in the natural park Nossentiner/Schwinzer Heide at 53◦35.5 N, 12◦31.8 E. The Klocksin lake chain extends from NNE to SSW and includes the four lakes Flacher See (64.4 m a.s.l.), Tiefer See (62.9 m a.s.l.), Hofsee (62.7 m a.s.l.) and Bergsee (62.6 m a.s.l.). The catchment geology of the northern part of the lake chain including Tiefer See is formed by tills while the southern part consists of glacifluvial sands. With a maximum depth of 62 to 63 m Tiefer See is the deepest lake of the Klocksin lake chain (Fig. 1). It has no major inflow and outflow. The catchment is mainly used for agriculture, the direct shoreline of the lake is covered by a fringe of trees without any buildings and roads
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