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3. Early anthropogenic impact on Western Central African rainforests 2,600 y ago

Author

Garcin, Yannick, Deschamps, Pierre, Ménot, Guillemette, de Saulieu, Geoffroy, Schefuß, Enno, Sebag, David, Dupont, Lydie M., Oslisly, Richard, Brademann, Brian, Mbusnum, Kevin G., Onana, Jean-Michel, Ako, Andrew A., Epp, Laura S., Tjallingii, Rik, Strecker, Manfred R., Brauer, Achim, and Sachse, Dirk

Published
2018

8. Advances in understanding calcite varve formation: new insights from a dual lake monitoring approach in the southern Baltic lowlands

Author

Roeser, Patricia, primary, Dräger, Nadine, additional, Brykała, Dariusz, additional, Ott, Florian, additional, Pinkerneil, Sylvia, additional, Gierszewski, Piotr, additional, Lindemann, Christin, additional, Plessen, Birgit, additional, Brademann, Brian, additional, Kaszubski, Michał, additional, Fojutowski, Michał, additional, Schwab, Markus J., additional, Słowiński, Michał, additional, Błaszkiewicz, Mirosław, additional, and Brauer, Achim, additional

Published
2021
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9. VARDA (VARved sediments DAtabase) – providing and connecting proxy data from annually laminated lake sediments

Author

Ramisch, Arne, primary, Brauser, Alexander, additional, Dorn, Mario, additional, Blanchet, Cecile, additional, Brademann, Brian, additional, Köppl, Matthias, additional, Mingram, Jens, additional, Neugebauer, Ina, additional, Nowaczyk, Norbert, additional, Ott, Florian, additional, Pinkerneil, Sylvia, additional, Plessen, Birgit, additional, Schwab, Markus J., additional, Tjallingii, Rik, additional, and Brauer, Achim, additional

Published
2020
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10. Differences in calcite varve formation discerned by a dual lake monitoring approach in the southern Baltic lowlands

Author

Roeser, Patricia, primary, Dräger, Nadine, additional, Brykała, Dariusz, additional, Ott, Florian, additional, Pinkerneil, Sylvia, additional, Gierszewski, Piotr, additional, Lindemann, Christin, additional, Plessen, Birgit, additional, Brademann, Brian, additional, Kaszubski, Michał, additional, Fojutowski, Michał, additional, Schwab, Markus J., additional, Słowiński, Michał, additional, Błaszkiewicz, Mirosław, additional, and Brauer, Achim, additional

Published
2020
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11. Constructing paleoclimate networks from annually laminated lake sediments – the VARDA database

Author

Ramisch, Arne, primary, Brauser, Alexander, additional, Dorn, Mario, additional, Blanchet, Cecile, additional, Brademann, Brian, additional, Köppl, Matthias, additional, Mingram, Jens, additional, Neugebauer, Ina, additional, Nowaczyk, Norbert, additional, Ott, Florian, additional, Pinkerneil, Sylvia, additional, Plessen, Birgit, additional, Schwab, Markus J., additional, Tjallingii, Rik, additional, and Brauer, Achim, additional

Published
2020
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12. Tiefer See – a key site for lake sediment research in NE Germany

Author

Brauer, Achim, Schwab, Markus J., Brademann, Brian, Pinkerneil, Sylvia, and Theuerkauf, Martin

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.

Published
2019

13. Interdisciplinary Geo-ecological Research across Time Scales in the Northeast German Lowland Observatory (TERENO-NE)

Author

Heinrich, Ingo, Balanzategui, Daniel, Bens, Oliver, Blasch, Gerald, Blume, Theresa, Böttcher, Falk, Borg, Erik, Brademann, Brian, Brauer, Achim, Conrad, Christopher, Dietze, Elisabeth, Dräger, Nadine, Fiener, Peter, Gerke, Horst H., Güntner, Andreas, Heine, Iris, Helle, Gerhard, Herbrich, Marcus, Harfenmeister, Katharina, Heußner, Karl-Uwe, Hohmann, Christian, Itzerott, Sibylle, Jurasinski, Gerald, Kaiser, Knut, Kappler, Christoph, Koebsch, Franziska, Liebner, Susanne, Lischeid, Gunnar, Merz, Bruno, Missling, Klaus Dieter, Morgner, Markus, Pinkerneil, Sylvia, Plessen, Birgit, Raab, Thomas, Ruhtz, Thomas, Sachs, Torsten, Sommer, Michael, Spengler, Daniel, Stender, Vivien, Stüve, Peter, and Wilken, Florian

Subjects
lcsh:GE1-350, lcsh:Geology, lcsh:QE1-996.5, ddc:550, Institut für Geowissenschaften, lcsh:Environmental sciences
Abstract

The Northeast German Lowland Observatory (TERENO-NE) was established to investigate the regional impact of climate and land use change. TERENO-NE focuses on the Northeast German lowlands, for which a high vulnerability has been determined due to increasing temperatures and decreasing amounts of precipitation projected for the coming decades. To facilitate in-depth evaluations of the effects of climate and land use changes and to separate the effects of natural and anthropogenic drivers in the region, six sites were chosen for comprehensive monitoring. In addition, at selected sites, geoarchives were used to substantially extend the instrumental records back in time. It is this combination of diverse disciplines working across different time scales that makes the observatory TERENO-NE a unique observation platform. We provide information about the general characteristics of the observatory and its six monitoring sites and present examples of interdisciplinary research activities at some of these sites. We also illustrate how monitoring improves process understanding, how remote sensing techniques are fine-tuned by the most comprehensive ground-truthing site DEMMIN, how soil erosion dynamics have evolved, how greenhouse gas monitoring of rewetted peatlands can reveal unexpected mechanisms, and how proxy data provides a long-term perspective of current ongoing changes.

Published
2018

14. No evidence for climate variability during the late Holocene rainforest crisis in Western Central Africa REPLY

Author

Garcin, Yannick, DESCHAMPS, Pierre, Menot, Guillemette, Saulieu, Geoffroy, Schefuss, Enno, Sebag, David, Dupont, Lydie M., Oslisly, Richard, Brademann, Brian, Mbusnum, Kevin G., Onana, Jean-Michel, Ako, Andrew A., Epp, Laura S., Tjallingii, Rik, Strecker, Manfred R., Brauer, Achim, Sachse, Dirk, Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)

Subjects
[SDU]Sciences of the Universe [physics], values, tree
Abstract

WOS:000438892600002

Published
2018

15. Human activity is the most probable trigger of the late Holocene rainforest crisis in Western Central Africa Reply

Author

Garcin, Yannick, DESCHAMPS, Pierre, Menot, Guillemette, Saulieu, Geoffroy, Schefuss, Enno, Sebag, David, Dupont, Lydie M., Oslisly, Richard, Brademann, Brian, Mbusnum, Kevin G., Onana, Jean-Michel, Ako, Andrew A., Epp, Laura S., Tjallingii, Rik, Strecker, Manfred R., Brauer, Achim, Sachse, Dirk, University of Potsdam = Universität Potsdam, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Universität Potsdam, Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU]Sciences of the Universe [physics]
Abstract

WOS:000432663000002; International audience

Published
2018

16. Hydroclimate and vegetation changes in Central Africa during the Holocene: new views from the Lake Barombi Mbo (Cameroon)

Author

Garcin, Yannick, Menot, G, Deschamps, P., Schefuß, Enno, Sachse, Dirk, De Saulieu, G., Sebag, David, Oslisly, Richard, Dupont, L., Brademann, Brian, Tjallingii, Rik, Brauer, A., Institute of Earth and Environmental Science [Potsdam], University of Potsdam, GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ), Eau, Changements Environnementaux & Sociétaux (EChangES), Hydrosciences Montpellier (HSM), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Transferts dans les Eco-hydrosystèmes (TECHS), and German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ)

Subjects
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

18. Advances in understanding calcite varve formation: new insights from a dual lake monitoring approach in the southern Baltic lowlands

Author

Dariusz Brykała, Brian Brademann, Nadine Dräger, Birgit Plessen, Sylvia Pinkerneil, Piotr Gierszewski, Florian Ott, Patricia Roeser, Markus J. Schwab, Achim Brauer, Christin Lindemann, Michał Fojutowski, Mirosław Błaszkiewicz, Michał Kaszubski, Michał Słowiński, Roeser, Patricia, 1Marine Geology Section IOW Leibniz Institute for Baltic Sea Research Warnemünde Seestrasse 15 Rostock 18119 Germany, Dräger, Nadine, 2Section 4.3 – Climate Dynamics and Landscape Evolution GFZ German Research Centre for Geosciences Telegrafenberg Potsdam 14473 Germany, Brykała, Dariusz, 3Department of Environmental Resources and Geohazards Institute of Geography and Spatial Organization of the Polish Academy of Sciences ul. Kopernika 19 Toruń 87‐100 Poland, Ott, Florian, Pinkerneil, Sylvia, Gierszewski, Piotr, Lindemann, Christin, Plessen, Birgit, Brademann, Brian, Kaszubski, Michał, Fojutowski, Michał, Schwab, Markus J., Słowiński, Michał, Błaszkiewicz, Mirosław, and Brauer, Achim

Subjects
Calcite, 554.3, Archeology, 552.58, Varve, calcite varves, Geochemistry, Geology, DUAL (cognitive architecture), seasonal sedimentation, chemistry.chemical_compound, chemistry, Tiefer See, Ecology, Evolution, Behavior and Systematics, Baltic lowlands, Czechowskie
Abstract

We revise the conceptual model of calcite varves and present, for the first time, a dual lake monitoring study in two alkaline lakes providing new insights into the seasonal sedimentation processes forming these varves. The study lakes, Tiefer See in NE Germany and Czechowskie in N Poland, have distinct morphology and bathymetry, and therefore, they are ideal to decipher local effects on seasonal deposition. The monitoring setup in both lakes is largely identical and includes instrumental observation of (i) meteorological parameters, (ii) chemical profiling of the lake water column including water sampling, and (iii) sediment trapping at both bi‐weekly and monthly intervals. We then compare our monitoring data with varve micro‐facies in the sediment record. One main finding is that calcite varves form complex laminae triplets rather than simple couplets as commonly thought. Sedimentation of varve sub‐layers in both lakes is largely dependent on the lake mixing dynamics and results from the same seasonality, commencing with diatom blooms in spring turning into a pulse of calcite precipitation in summer and terminating with a re‐suspension layer in autumn and winter, composed of calcite patches, plant fragments and benthic diatoms. Despite the common seasonal cycle, the share of each of these depositional phases in the total annual sediment yield is different between the lakes. In Lake Tiefer See calcite sedimentation has the highest yields, whereas in Lake Czechowskie, the so far underestimated re‐suspension sub‐layer dominates the sediment accumulation. Even in undisturbed varved sediments, re‐suspended material becomes integrated in the sediment fabric and makes up an important share of calcite varves. Thus, while the biogeochemical lake cycle defines the varves’ autochthonous components and micro‐facies, the physical setting plays an important role in determining the varve sub‐layers’ proportion., Leibniz‐Gemeinschaft http://dx.doi.org/10.13039/501100001664, Narodowe Centrum Nauki http://dx.doi.org/10.13039/501100004281, Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659, ICLEA

Published
2021

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