Impact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden

Diatom-rich sediment in a small subarctic lake (Lake 850) was investigated in a 9400 cal. yr BP sediment record in order to explore the impact of Holocene climate evolution on silicon cycling. Diatom stable silicon isotopes (δ30SiBSi ) and biogenic silica (BSi) indicate that high BSi concentrations...

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Bibliographic Details
Published in:The Holocene
Main Authors: Zahajská, Petra, Cartier, Rosine, Fritz, Sherilyn Claire, Stadmark, Johanna, Opfergelt, Sophie, Yam, Ruth, Shemesh, Aldo, Conley, Daniel
Format: Article in Journal/Newspaper
Language:English
Published: SAGE Publications 2021
Subjects:
Geosciences
Multidisciplinary
diatom
lake
Holocene
isotope
sediment
silicon
Northern Sweden
Subarctic
Online Access:https://lup.lub.lu.se/record/b827c0c9-017d-4122-8e35-eaa0ebc30174
https://doi.org/10.1177/09596836211025973
Description
Summary:Diatom-rich sediment in a small subarctic lake (Lake 850) was investigated in a 9400 cal. yr BP sediment record in order to explore the impact of Holocene climate evolution on silicon cycling. Diatom stable silicon isotopes (δ30SiBSi ) and biogenic silica (BSi) indicate that high BSi concentrations in sediment throughout the Holocene are associated with a lighter Si isotope source of dissolved silica (DSi), such as groundwater or freshly weathered primary minerals. Furthermore, higher BSi concentrations were favoured during the mid-Holocene by low detrital inputs and possibly a longer ice-free period allowing for more diatom production to occur. The diatom δ30SiBSi signature shows a link to changes in regional climate and is influenced by length of diatom growth period and hydrological fluctuations. Lighter Si isotopic values occur during the mid Holocene, when climate is inferred to be more continental and drier, with pronounced seasonality. In contrast, a heavier Si isotopic signature is observed in the early and late Holocene, when oceanic influences are thought to be stronger and the climate wetter. The δ30SiBSi values have generally lighter signatures as compared with other studies, which supports a light DSi source.

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