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Using Annual Resolution Pollen Analysis to Synchronize Varve and Tree-Ring Records

1
Department of Peatland Studies and Palaeoecology, Institute of Botany and Landscape Ecology, University of Greifswald, 17489 Greifswald, Germany
2
Section 5.2: Climate Dynamics & Landscape Evolution, GFZ—German Research Centre for Geosciences, Helmholtz Centre Potsdam, 14473 Potsdam, Germany
3
Department of Chemical Analytics and Biogeochemistry, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, 12587 Berlin, Germany
*
Author to whom correspondence should be addressed.
Quaternary 2019, 2(3), 23; https://doi.org/10.3390/quat2030023
Received: 16 May 2019 / Revised: 19 June 2019 / Accepted: 3 July 2019 / Published: 8 July 2019
(This article belongs to the Special Issue Annually Laminated Lake Sediments)
Fossil wood and varved lake sediments allow proxy analysis with exceptionally high, (sub-)annual resolution. Both archives provide dating through ring and layer counting, yet with different accuracy. In wood, counting errors are small and can be eliminated through cross-dating because tree-rings show regionally synchronous patterns. In varved sediments, counting errors are larger and cross-dating is hampered by missing regional patterns in varve parameters. Here, we test whether annual pollen analysis is suited to synchronize varve records. To that end, annual pollen deposition was estimated in three short cores from two lakes in north-eastern Germany for the period 1980–2017 CE. Analysis has focused on Fagus sylvatica and Picea abies, which show the strongest annual variations in flowering (mast). For both tree taxa, annual flowering variations recorded by forest and pollen monitoring are well represented in varved lake sediments, hence indeed allow us to synchronize the records. Some pollen mast events were not recognized, which may relate to sampling uncertainties, redeposition or regional variations in flowering. In Fagus sylvatica, intense flowering limits wood growth in the same year. Peaks in pollen deposition hence correlate with minima in tree-ring width, which provides a link between varved lake sediments and fossil wood. View Full-Text
Keywords: annually laminated lake sediments; dating; mast; pollen analysis; tree-rings; varves annually laminated lake sediments; dating; mast; pollen analysis; tree-rings; varves
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Theuerkauf, M.; Engelbrecht, E.; Dräger, N.; Hupfer, M.; Mrotzek, A.; Prager, A.; Scharnweber, T. Using Annual Resolution Pollen Analysis to Synchronize Varve and Tree-Ring Records. Quaternary 2019, 2, 23.

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