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Preprints
https://doi.org/10.5194/essd-2020-55
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-55
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Mar 2020

30 Mar 2020

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A revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

VARDA (VArved sediments DAtabase) – providing and connecting proxy data from annually laminated lake sediments

Arne Ramisch, Alexander Brauser, Mario Dorn, Cecile Blanchet, Brian Brademann, Matthias Köppl, Jens Mingram, Ina Neugebauer, Norbert Nowaczyk, Florian Ott, Sylvia Pinkerneil, Birgit Plessen, Markus J. Schwab, Rik Tjallingii, and Achim Brauer Arne Ramisch et al.
  • GFZ German Research Center for Geoscience, Section Climate Dynamics and Landscape Evolution, Telegrafenberg, 14473 Potsdam, Germany

Abstract. Varved lake sediments provide long climatic records with high temporal resolution and low associated age uncertainty. Robust and detailed comparison of well-dated and annually laminated sediment records is crucial for reconstructing abrupt and regionally time-transgressive changes as well as validation of spatial and temporal trajectories of past climatic changes. The VARved sediments DAtabase (VARDA) presented here is the first data compilation for varve chronologies and associated palaeoclimatic proxy records. The current version 1.0 allows detailed comparison of published varve records from 95 lakes. VARDA is freely accessible and was created to assess outputs from climate models with high-resolution terrestrial palaeoclimatic proxies. VARDA additionally provides a technical environment that enables to explore the database of varved lake sediments using a connected data-model and can generate a state-of-the-art graphic representation of multi-site comparison. This allows to reassess existing chronologies and tephra events to synchronize and compare even distant varved lake records. Furthermore, the present version of VARDA permits to explore varve thickness data. In this paper, we report in detail on the data mining and compilation strategies for the identification of varved lakes and assimilation of high-resolution chronologies as well as the technical infrastructure of the database. Additional paleoclimate proxy data will be provided in forthcoming updates. The VARDA graph-database and user interface can be accessed online at https://varve.gfz-potsdam.de, all datasets of version 1.0 are available at http://doi.org/10.5880/GFZ.4.3.2019.003 (Ramisch et al., 2019).

Arne Ramisch et al.

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Arne Ramisch et al.

Data sets

Data inventory of the varve database (VARDA): Sediment profiles, chronologies, radiocarbon dates, tephra layers and varve thickness data A. Ramisch, A. Brauser, M. Dorn, A. Brauer, C. Blanchet, B. Brademann, M. Köppl, J. Mingram, I. Neugebauer, N. Nowaczyk, F. Ott, S. Pinkerneil, B. Plessen, M. Schwab, and R. Tjallingii https://doi.org/10.5880/GFZ.4.3.2019.003

Arne Ramisch et al.

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