Linking the formation of varves in a eutrophic temperate lake to meteorological conditions and water column dynamics.

Żarczyński, Maurycy; Zander, Paul D; Grosjean, Martin; Tylmann, Wojciech (2022). Linking the formation of varves in a eutrophic temperate lake to meteorological conditions and water column dynamics. Science of the total environment, 842, p. 156787. Elsevier 10.1016/j.scitotenv.2022.156787

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Despite varved sediments being widely used for paleolimnological studies, little information is available about how climate and meteorological signals are recorded in varves at sub-seasonal to annual scale. We investigate links between meteorological and limnological conditions and their influence on biochemical varve formation and preservation of sub-seasonal climate signals in the sediments. Our study site is postglacial Lake Żabińskie located in NE Poland, in which thick and complex varved sediments have been studied for the last decade. These sediments provide an excellent material for studying the influence of short-term weather conditions on geological records. For this, we use an almost decade-long (2012-2019) series of observational data (meteorological conditions, physicochemical water parameters, and modern sedimentation observations) to understand varve formation processes. Then we compare these results with a high-resolution biogeochemical proxy dataset based on μXRF and hyperspectral imaging (HSI) measurements of a varved sediment core spanning the same period. Here we show direct links between the meteorological and limnological conditions and varve formation processes This is particularly the case for air temperature which governs calcite laminae formation and primary production. We further show that calcite grain size is influenced by lake mixing intensity resulting from the wind activity, and that holomixis events lead to the formation of distinct manganese (Mn) peaks in the typically anoxic sediments. Our findings show that high-resolution non-destructive spectroscopy methods applied to complex biochemical varves, in combination with long observational limnological datasets, provide useful information for tracking meteorological and limnological processes in the past.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Paleolimnology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography

UniBE Contributor:

Zander, Paul David and Grosjean, Martin

Subjects:

500 Science > 550 Earth sciences & geology
900 History > 910 Geography & travel

ISSN:

0048-9697

Publisher:

Elsevier

Language:

English

Submitter:

Pubmed Import

Date Deposited:

27 Jun 2022 08:13

Last Modified:

17 Aug 2022 00:14

Publisher DOI:

10.1016/j.scitotenv.2022.156787

PubMed ID:

35752247

Uncontrolled Keywords:

Calcite Hyperspectral imaging Lake mixing Manganese Paleoweather Varves

BORIS DOI:

10.48350/170928

URI:

https://boris.unibe.ch/id/eprint/170928

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