Modern silicon dynamics of a small high-latitude subarctic lake
High biogenic silica (BSi) concentration occurs sporadically in lake sediments throughout the world, however, the processes leading to high BSi concentrations varies. While BSi formation and preservation is expected to occur in silica-rich environments with high dissolved silicon (DSi) concentration...
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ftulundlup:oai:lup.lub.lu.se:4eec1090-a430-49de-8e5f-25649b796914 2023-05-15T18:28:16+02:00 Modern silicon dynamics of a small high-latitude subarctic lake Zahajská, Petra Olid, Carolina Stadmark, Johanna Fritz, Sherilyn C. Opfergelt, Sophie Conley, Daniel 2021 https://lup.lub.lu.se/record/4eec1090-a430-49de-8e5f-25649b796914 https://doi.org/10.5194/bg-2020-441 eng eng Copernicus GmbH https://lup.lub.lu.se/record/4eec1090-a430-49de-8e5f-25649b796914 http://dx.doi.org/10.5194/bg-2020-441 scopus:85104078339 Biogeosciences; 18(7), pp 2325-2345 (2021) ISSN: 1726-4189 Meteorology and Atmospheric Sciences Geochemistry contributiontojournal/article info:eu-repo/semantics/article text 2021 ftulundlup https://doi.org/10.5194/bg-2020-441 2023-02-22T23:27:17Z High biogenic silica (BSi) concentration occurs sporadically in lake sediments throughout the world, however, the processes leading to high BSi concentrations varies. While BSi formation and preservation is expected to occur in silica-rich environments with high dissolved silicon (DSi) concentrations such as volcanic and hydrothermal inputs, the factors and mechanisms explaining high DSi and BSi concentrations in lakes remain unclear. We explored the factors responsible for the high BSi concentration in sediments of a small, high-latitude subarctic lake (Lake 850). To do this, we combined measurements of variations in stream discharges, DSi concentrations and stable Si isotopes in both lake and stream water with measurements of BSi content in lake sediments. Water, radon, and Si mass balances revealed the importance of groundwater discharge as a main source of DSi to the lake, with groundwater-derived DSi inputs 3 times higher than those from ephemeral stream inlets. After including all external DSi sources (i.e., inlets and groundwater discharge) and estimating the total BSi accumulation in the sediment, we show that diatom production consumes up to 79 % of total DSi input. Additionally, low sediment accumulation rates were observed based on the dated core. Our findings thus demonstrate that groundwater discharge and low mass accumulation rate can account for the high BSi accumulation during the last 150 cal. yr BP. Globally, lakes have been estimated to retain one fifth of the annual DSi delivery into the ocean. Well constrained lake mass balances, such as presented here, bring clarity to those estimates of the terrestrial Si cycle sinks. Article in Journal/Newspaper Subarctic Lund University Publications (LUP) |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Meteorology and Atmospheric Sciences Geochemistry |
spellingShingle |
Meteorology and Atmospheric Sciences Geochemistry Zahajská, Petra Olid, Carolina Stadmark, Johanna Fritz, Sherilyn C. Opfergelt, Sophie Conley, Daniel Modern silicon dynamics of a small high-latitude subarctic lake |
topic_facet |
Meteorology and Atmospheric Sciences Geochemistry |
description |
High biogenic silica (BSi) concentration occurs sporadically in lake sediments throughout the world, however, the processes leading to high BSi concentrations varies. While BSi formation and preservation is expected to occur in silica-rich environments with high dissolved silicon (DSi) concentrations such as volcanic and hydrothermal inputs, the factors and mechanisms explaining high DSi and BSi concentrations in lakes remain unclear. We explored the factors responsible for the high BSi concentration in sediments of a small, high-latitude subarctic lake (Lake 850). To do this, we combined measurements of variations in stream discharges, DSi concentrations and stable Si isotopes in both lake and stream water with measurements of BSi content in lake sediments. Water, radon, and Si mass balances revealed the importance of groundwater discharge as a main source of DSi to the lake, with groundwater-derived DSi inputs 3 times higher than those from ephemeral stream inlets. After including all external DSi sources (i.e., inlets and groundwater discharge) and estimating the total BSi accumulation in the sediment, we show that diatom production consumes up to 79 % of total DSi input. Additionally, low sediment accumulation rates were observed based on the dated core. Our findings thus demonstrate that groundwater discharge and low mass accumulation rate can account for the high BSi accumulation during the last 150 cal. yr BP. Globally, lakes have been estimated to retain one fifth of the annual DSi delivery into the ocean. Well constrained lake mass balances, such as presented here, bring clarity to those estimates of the terrestrial Si cycle sinks. |
format |
Article in Journal/Newspaper |
author |
Zahajská, Petra Olid, Carolina Stadmark, Johanna Fritz, Sherilyn C. Opfergelt, Sophie Conley, Daniel |
author_facet |
Zahajská, Petra Olid, Carolina Stadmark, Johanna Fritz, Sherilyn C. Opfergelt, Sophie Conley, Daniel |
author_sort |
Zahajská, Petra |
title |
Modern silicon dynamics of a small high-latitude subarctic lake |
title_short |
Modern silicon dynamics of a small high-latitude subarctic lake |
title_full |
Modern silicon dynamics of a small high-latitude subarctic lake |
title_fullStr |
Modern silicon dynamics of a small high-latitude subarctic lake |
title_full_unstemmed |
Modern silicon dynamics of a small high-latitude subarctic lake |
title_sort |
modern silicon dynamics of a small high-latitude subarctic lake |
publisher |
Copernicus GmbH |
publishDate |
2021 |
url |
https://lup.lub.lu.se/record/4eec1090-a430-49de-8e5f-25649b796914 https://doi.org/10.5194/bg-2020-441 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Biogeosciences; 18(7), pp 2325-2345 (2021) ISSN: 1726-4189 |
op_relation |
https://lup.lub.lu.se/record/4eec1090-a430-49de-8e5f-25649b796914 http://dx.doi.org/10.5194/bg-2020-441 scopus:85104078339 |
op_doi |
https://doi.org/10.5194/bg-2020-441 |
_version_ |
1766210667554013184 |