Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures
The aim of this study was to reconstruct diatom production in the subarctic northern tip of the Baltic Sea, Bothnian Bay, based on down-core analysis of Si isotopes in biogenic silica (BSi). Dating of the sediment showed that the samples covered the period 1820 to 2000. The sediment core record can...
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ftstockholmuniv:oai:DiVA.org:su-65184 2023-05-15T18:28:32+02:00 Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures Sun, Xiaole Andersson, Per Humborg, Christoph Gustafsson, Bo Conley, Daniel J. Crill, Patrick Mörth, Carl-Magnus 2011 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-65184 https://doi.org/10.5194/bg-8-3491-2011 eng eng Institutionen för geologiska vetenskaper Institutionen för tillämpad miljövetenskap (ITM) Baltic Nest Institute Naturhistoriska riksmuseet, Laboratoriet för isotopgeologi Lunds universitet Biogeosciences, 1726-4170, 2011, 8:11, s. 3491-3499 orcid:0000-0003-2391-5572 orcid:0000-0002-0649-5599 orcid:0000-0003-1048-8452 orcid:0000-0003-1110-3059 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-65184 doi:10.5194/bg-8-3491-2011 ISI:000298132200024 info:eu-repo/semantics/openAccess Geosciences Multidisciplinary Multidisciplinär geovetenskap Geochemistry Geokemi Climate Research Klimatforskning Article in journal info:eu-repo/semantics/article text 2011 ftstockholmuniv https://doi.org/10.5194/bg-8-3491-2011 2023-02-23T21:42:20Z The aim of this study was to reconstruct diatom production in the subarctic northern tip of the Baltic Sea, Bothnian Bay, based on down-core analysis of Si isotopes in biogenic silica (BSi). Dating of the sediment showed that the samples covered the period 1820 to 2000. The sediment core record can be divided into two periods, an unperturbed period from 1820 to 1950 and a second period affected by human activities (from 1950 to 2000). This has been observed elsewhere in the Baltic Sea. The shift in the sediment core record after 1950 is likely caused by large scale damming of rivers. Diatom production was inferred from the Si isotope composition which ranged between δ30Si −0.18‰ and +0.58‰ in BSi, and assuming fractionation patterns due to the Raleigh distillation, the production was shown to be correlated with air and water temperature, which in turn were correlated with the mixed layer (ML) depth. The sedimentary record showed that the deeper ML depth observed in colder years resulted in less production of diatoms. Pelagic investigations in the 1990's have clearly shown that diatom production in the Baltic Sea is controlled by the ML depth. Especially after cold winters and deep water mixing, diatom production was limited and dissolved silicate (DSi) concentrations were not depleted in the water column after the spring bloom. Our method corroborates these findings and offers a new method to estimate diatom production over much longer periods of time in diatom dominated aquatic systems, i.e. a large part of the world's ocean and coastal seas. Article in Journal/Newspaper Subarctic Stockholm University: Publications (DiVA) Raleigh ENVELOPE(-55.731,-55.731,51.567,51.567) Biogeosciences 8 11 3491 3499 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Geosciences Multidisciplinary Multidisciplinär geovetenskap Geochemistry Geokemi Climate Research Klimatforskning |
spellingShingle |
Geosciences Multidisciplinary Multidisciplinär geovetenskap Geochemistry Geokemi Climate Research Klimatforskning Sun, Xiaole Andersson, Per Humborg, Christoph Gustafsson, Bo Conley, Daniel J. Crill, Patrick Mörth, Carl-Magnus Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures |
topic_facet |
Geosciences Multidisciplinary Multidisciplinär geovetenskap Geochemistry Geokemi Climate Research Klimatforskning |
description |
The aim of this study was to reconstruct diatom production in the subarctic northern tip of the Baltic Sea, Bothnian Bay, based on down-core analysis of Si isotopes in biogenic silica (BSi). Dating of the sediment showed that the samples covered the period 1820 to 2000. The sediment core record can be divided into two periods, an unperturbed period from 1820 to 1950 and a second period affected by human activities (from 1950 to 2000). This has been observed elsewhere in the Baltic Sea. The shift in the sediment core record after 1950 is likely caused by large scale damming of rivers. Diatom production was inferred from the Si isotope composition which ranged between δ30Si −0.18‰ and +0.58‰ in BSi, and assuming fractionation patterns due to the Raleigh distillation, the production was shown to be correlated with air and water temperature, which in turn were correlated with the mixed layer (ML) depth. The sedimentary record showed that the deeper ML depth observed in colder years resulted in less production of diatoms. Pelagic investigations in the 1990's have clearly shown that diatom production in the Baltic Sea is controlled by the ML depth. Especially after cold winters and deep water mixing, diatom production was limited and dissolved silicate (DSi) concentrations were not depleted in the water column after the spring bloom. Our method corroborates these findings and offers a new method to estimate diatom production over much longer periods of time in diatom dominated aquatic systems, i.e. a large part of the world's ocean and coastal seas. |
format |
Article in Journal/Newspaper |
author |
Sun, Xiaole Andersson, Per Humborg, Christoph Gustafsson, Bo Conley, Daniel J. Crill, Patrick Mörth, Carl-Magnus |
author_facet |
Sun, Xiaole Andersson, Per Humborg, Christoph Gustafsson, Bo Conley, Daniel J. Crill, Patrick Mörth, Carl-Magnus |
author_sort |
Sun, Xiaole |
title |
Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures |
title_short |
Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures |
title_full |
Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures |
title_fullStr |
Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures |
title_full_unstemmed |
Climate Dependent Diatom Production is Preserved in Biogenic Si Isotope Signatures |
title_sort |
climate dependent diatom production is preserved in biogenic si isotope signatures |
publisher |
Institutionen för geologiska vetenskaper |
publishDate |
2011 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-65184 https://doi.org/10.5194/bg-8-3491-2011 |
long_lat |
ENVELOPE(-55.731,-55.731,51.567,51.567) |
geographic |
Raleigh |
geographic_facet |
Raleigh |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
Biogeosciences, 1726-4170, 2011, 8:11, s. 3491-3499 orcid:0000-0003-2391-5572 orcid:0000-0002-0649-5599 orcid:0000-0003-1048-8452 orcid:0000-0003-1110-3059 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-65184 doi:10.5194/bg-8-3491-2011 ISI:000298132200024 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-8-3491-2011 |
container_title |
Biogeosciences |
container_volume |
8 |
container_issue |
11 |
container_start_page |
3491 |
op_container_end_page |
3499 |
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1766211051280400384 |