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Sedimentation in a small lake, more complex than previously assumed.: Bathymetrical and geochemical sediment analyses in Kassjön (63°55´ N, 20°01´ E).
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

For studies using lake sediments as a medium, understanding factors governing sediment distribution and properties is crucial for making accurate interpretations and conclusions. General lake sedimentation theory is however mainly based on larger lakes and systems, potentially leading to biased sampling and data interpretation when applied on a smaller system. In a paper published in 2008, Rippey et al. evaluated the fit of some general sedimentation theories on element distribution in the sediments of Kassjön (63°55´ N, 20°01´ E), northern Sweden. This small boreal lake reoccurs in the scientific literature, largely from paleolimnological studies on varved sediments in the lake, making the understanding of its sediment properties highly relevant. As part of a wider geochemical study on the lake, this paper scrutinizes the findings of Rippey et al. (2008) by using updated bathymetry and geochemical analyses, to provide further insight on sedimentation in Kassjön. Element composition, analysed with X-ray fluorescence spectrometry, and dry weight was obtained from sediment samples at 40 sites. Depth at sampling sites, together with catchment morphometry and previous bathymetry, was used to improve the bathymetric understanding. Kassjön was found to have a less steep bathymetry than previously assumed, with distribution of sediment geochemistry and dry weight showing heterogeneity differing from that expected of general sedimentation theories only. These results indicate that previous findings on sedimentation in Kassjön might be too simplistic, and that small-lake sedimentation is influenced by factors not included in general sedimentation models. Caution is therefore advised when e.g. interpreting the environmental record in lake sediments.

Place, publisher, year, edition, pages
2017. , 24 p.
Keyword [en]
Kassjön, Sedimentation, Element distribution, Small lake, Bathymetry, X-ray fluorescence spectrometry
National Category
Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-136301OAI: oai:DiVA.org:umu-136301DiVA: diva2:1110400
Subject / course
Examensarbete i Naturgeografi för kandidatexamen
Educational program
Bachelor of Science in Biology and Earthscience
Presentation
2017-06-02, NC280, UMEÅ, 16:27 (Swedish)
Supervisors
Examiners
Available from: 2017-06-16 Created: 2017-06-15 Last updated: 2017-06-16Bibliographically approved

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Gydemo Östbom, Viktor
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • text
  • asciidoc
  • rtf