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

Zahajská, Petra LU orcid ; Cartier, Rosine LU ; Fritz, Sherilyn Claire LU ; Stadmark, Johanna LU ; Opfergelt, Sophie ; Yam, Ruth ; Shemesh, Aldo and Conley, Daniel LU (2021) In The Holocene 31(10). p.1582-1592
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 (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... (More)
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. (Less)
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
diatom, lake, Holocene, isotope, sediment, silicon
in
The Holocene
volume
31
issue
10
pages
1582 - 1592
publisher
SAGE Publications
external identifiers
  • scopus:85108881904
ISSN
0959-6836
DOI
10.1177/09596836211025973
project
Diatom-rich sediment formation in lakes
language
English
LU publication?
yes
id
b827c0c9-017d-4122-8e35-eaa0ebc30174
date added to LUP
2021-06-30 16:02:53
date last changed
2023-02-21 10:44:37
@article{b827c0c9-017d-4122-8e35-eaa0ebc30174,
  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<sup>30</sup>Si<sub>BSi</sub> ) 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<sup>30</sup>Si<sub>BSi</sub> 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<sup>30</sup>Si<sub>BSi </sub>values have generally lighter signatures as compared with other studies, which supports a light DSi source.}},
  author       = {{Zahajská, Petra and Cartier, Rosine and Fritz, Sherilyn Claire and Stadmark, Johanna and Opfergelt, Sophie and Yam, Ruth and Shemesh, Aldo and Conley, Daniel}},
  issn         = {{0959-6836}},
  keywords     = {{diatom; lake; Holocene; isotope; sediment; silicon}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{10}},
  pages        = {{1582--1592}},
  publisher    = {{SAGE Publications}},
  series       = {{The Holocene}},
  title        = {{Impact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden}},
  url          = {{http://dx.doi.org/10.1177/09596836211025973}},
  doi          = {{10.1177/09596836211025973}},
  volume       = {{31}},
  year         = {{2021}},
}