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- Title
Impact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden.
- Authors
Zahajská, Petra; Cartier, Rosine; Fritz, Sherilyn C; Stadmark, Johanna; Opfergelt, Sophie; Yam, Ruth; Shemesh, Aldo; Conley, Daniel J
- Abstract
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 ( δ 30 Si BSi ) 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 δ 30 Si BSi 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 δ 30 Si BSi values have generally lighter signatures as compared with other studies, which supports a light DSi source.
- Subjects
SWEDEN; HOLOCENE Epoch; SILICON isotopes; CLIMATE change; STABLE isotopes; ISOTOPIC signatures; SILICON solar cells
- Publication
Holocene, 2021, Vol 31, Issue 10, p1582
- ISSN
0959-6836
- Publication type
Article
- DOI
10.1177/09596836211025973