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Sanchini, Andrea (2020): A Holocene high-resolution record of aquatic productivity, seasonal anoxia and meromixis from varved sediments of Lake Łazduny, NE Poland: insight from a novel multi-proxy approach [dataset publication series]. University of Bern, PANGAEA, https://doi.org/10.1594/PANGAEA.914847

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Published: 2020-04-16 • DOI registered: 2021-03-30

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Abstract:
Anthropogenic eutrophication and spreading anoxia in freshwater systems is a global concern. Little is known about anoxia in earlier historic times under weaker human impact, or under prehistoric natural conditions with different trophic, land cover and climatic regimes. We use a novel approach combining high-resolution hyperspectral imaging with µ-XRF and HPLC-pigment data, which allows us to assess chloropigments (productivity) and bacteriopheophytin (anoxia) at seasonal subvarve-scale resolution. Our ~ 9700 cal a BP varved sediment record from NE Poland suggests that productivity increased stepwise from oligotrophic Early Holocene conditions (until ~ 9200 cal a BP) to mesotrophic conditions in the Mid- and Late Holocene. Natural eutrophication was mainly a function of progressing landscape evolution with intense weathering under dense forest and warm-moist climatic conditions. Generally, anoxia increased with increasing productivity. Seasonal anoxia and some multi-decadal periods of meromixis were the common mixing patterns throughout the Holocene except for a period of persisting meromixis between ~ 5200 and 2000 cal a BP. Anthropogenic deforestation around 400 cal a BP resulted in substantially better lake oxygenation despite high productivity. In this small lake, aquatic productivity and lakeshore forest cover (wind shield) were more important factors controlling oxic/anoxic conditions than Holocene temperature variability.
Keyword(s):
anoxia; Aquatic productivity; High resolution record; Holocene; Poland
Funding:
Swiss National Science Foundation (SNF), grant/award no. 172586: Exploring VNIR/SWIR Hyperspectral Imaging of Varved Lake Sediments: Methods and Applications in Paleoclimatology and Paleoecology
Coverage:
Latitude: 53.855083 * Longitude: 21.951972
Date/Time Start: 2017-02-18T00:00:00 * Date/Time End: 2017-08-31T00:00:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
15 datasets

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Datasets listed in this publication series

  1. Sanchini, A (2020): Results of cluster analysis of X-ray fluorescence measurements of varved sediments from Lake Łazduny, NE Poland (smooth 1 cm). https://doi.org/10.1594/PANGAEA.914823
  2. Sanchini, A (2020): Bulk analysis of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914824
  3. Sanchini, A (2020): Pigment index of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914827
  4. Sanchini, A (2020): Pigments of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914830
  5. Sanchini, A (2020): Titanium counts and age of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914832
  6. Sanchini, A (2020): Chlorophyll, Pyropheophorbide and age of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914833
  7. Sanchini, A (2020): Age and water temperature reconstruction of varved sediments from Lake Łazduny, NE Poland - Heikkilä. https://doi.org/10.1594/PANGAEA.914839
  8. Sanchini, A (2020): Age and water temperature reconstruction of varved sediments from Lake Łazduny, NE Poland - Seppä. https://doi.org/10.1594/PANGAEA.914840
  9. Sanchini, A (2020): Pollen and age of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914835
  10. Sanchini, A (2020): Temperature, Chlorophyll, pH, and specific Conductivity of Lake Łazduny, NE Poland, during different seasons. https://doi.org/10.1594/PANGAEA.914803
  11. Sanchini, A (2020): Pyropheophorbide of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914804
  12. Sanchini, A (2020): Chlorophyll of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914806
  13. Sanchini, A (2020): Petrophysical analysis of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914809
  14. Sanchini, A (2020): X-ray fluorescence analysis of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914811
  15. Sanchini, A (2020): Specimen analysis of varved sediments from Lake Łazduny, NE Poland. https://doi.org/10.1594/PANGAEA.914812