Open AccessImpact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden
Author(s) -
Petra Zahajská,
Rosine Cartier,
Sherilyn C. Fritz,
Johanna Stadmark,
Sophie Opfergelt,
Ruth Yam,
Aldo Shemesh,
Daniel J. Conley
Publication year - 2021
Publication title -
holocene
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.008
H-Index - 117
eISSN - 1477-0911
pISSN - 0959-6836
DOI - 10.1177/09596836211025973
Subject(s) - holocene , diatom , biogenic silica , geology , oceanography , climate change , sediment , subarctic climate , period (music) , paleoclimatology , physical geography , paleontology , geography , physics , acoustics
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 ([Formula: see text]) 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 [Formula: see text] 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 [Formula: see text] values have generally lighter signatures as compared with other studies, which supports a light DSi source.