New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean
The silicon isotope composition of silicic acid, delta Si-30(OH)(4), in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, delta Si-30(OH)(4) was examined on US GEOTRACES section GN01 from the Bering Strai...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/505293 2023-06-11T04:08:20+02:00 New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean Brzezinski, Mark A. Closset, Ivia Jones, Janice L. de Souza, Gregory F. Maden, Colin 2021-08-19 application/application/pdf https://hdl.handle.net/20.500.11850/505293 https://doi.org/10.3929/ethz-b-000505293 en eng Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2021.699762 info:eu-repo/semantics/altIdentifier/wos/000692527300001 http://hdl.handle.net/20.500.11850/505293 doi:10.3929/ethz-b-000505293 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Frontiers in Marine Science, 8 nutrients biogeochemical cycles diatoms silicon isotopes Arctic ocean Geotraces stable isotope Si30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftethz https://doi.org/20.500.11850/50529310.3929/ethz-b-00050529310.3389/fmars.2021.699762 2023-05-28T23:49:18Z The silicon isotope composition of silicic acid, delta Si-30(OH)(4), in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, delta Si-30(OH)(4) was examined on US GEOTRACES section GN01 from the Bering Strait to the North Pole. Isotope values in the polar mixed layer showed a strong influence of the transpolar drift. Drift waters contained relatively high [Si(OH)(4)] with heavy delta Si-30(OH)(4) consistent with the high silicate of riverine source waters and strong biological Si(OH)(4) consumption on the Eurasian shelves. The maximum in silicic acid concentration, [Si(OH)(4)], within the double halocline of the Canada Basin formed a local minimum in delta Si-30(OH)(4) that extended across the Canada Basin, reflecting the high-[Si(OH)(4)] Pacific source waters and benthic inputs of Si(OH)(4) in the Chukchi Sea. delta Si-30(OH)(4) became lighter with the increase in [Si(OH)(4)] in intermediate and deep waters; however, both Canada Basin deep water and Eurasian Basin deep water were heavier than deep waters from other ocean basins. A preliminary isotope budget incorporating all available Arctic delta Si-30(OH)(4) data confirms the importance of isotopically heavy inflows in creating the anomalous deep Arctic Si isotope signature, but also reveals a surprising similarity in the isotopic composition of the major inflows compared to outflows across the main gateways connecting the Arctic with the Pacific and the Atlantic. This similarity implies a major role of biological productivity and opal burial in removing light isotopes entering the Arctic Ocean from rivers. ISSN:2296-7745 Article in Journal/Newspaper Arctic Arctic Ocean Bering Strait canada basin Chukchi Chukchi Sea North Pole ETH Zürich Research Collection Arctic Arctic Ocean Bering Strait Canada Chukchi Sea North Pole Pacific |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
nutrients biogeochemical cycles diatoms silicon isotopes Arctic ocean Geotraces stable isotope Si30 |
spellingShingle |
nutrients biogeochemical cycles diatoms silicon isotopes Arctic ocean Geotraces stable isotope Si30 Brzezinski, Mark A. Closset, Ivia Jones, Janice L. de Souza, Gregory F. Maden, Colin New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean |
topic_facet |
nutrients biogeochemical cycles diatoms silicon isotopes Arctic ocean Geotraces stable isotope Si30 |
description |
The silicon isotope composition of silicic acid, delta Si-30(OH)(4), in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, delta Si-30(OH)(4) was examined on US GEOTRACES section GN01 from the Bering Strait to the North Pole. Isotope values in the polar mixed layer showed a strong influence of the transpolar drift. Drift waters contained relatively high [Si(OH)(4)] with heavy delta Si-30(OH)(4) consistent with the high silicate of riverine source waters and strong biological Si(OH)(4) consumption on the Eurasian shelves. The maximum in silicic acid concentration, [Si(OH)(4)], within the double halocline of the Canada Basin formed a local minimum in delta Si-30(OH)(4) that extended across the Canada Basin, reflecting the high-[Si(OH)(4)] Pacific source waters and benthic inputs of Si(OH)(4) in the Chukchi Sea. delta Si-30(OH)(4) became lighter with the increase in [Si(OH)(4)] in intermediate and deep waters; however, both Canada Basin deep water and Eurasian Basin deep water were heavier than deep waters from other ocean basins. A preliminary isotope budget incorporating all available Arctic delta Si-30(OH)(4) data confirms the importance of isotopically heavy inflows in creating the anomalous deep Arctic Si isotope signature, but also reveals a surprising similarity in the isotopic composition of the major inflows compared to outflows across the main gateways connecting the Arctic with the Pacific and the Atlantic. This similarity implies a major role of biological productivity and opal burial in removing light isotopes entering the Arctic Ocean from rivers. ISSN:2296-7745 |
format |
Article in Journal/Newspaper |
author |
Brzezinski, Mark A. Closset, Ivia Jones, Janice L. de Souza, Gregory F. Maden, Colin |
author_facet |
Brzezinski, Mark A. Closset, Ivia Jones, Janice L. de Souza, Gregory F. Maden, Colin |
author_sort |
Brzezinski, Mark A. |
title |
New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean |
title_short |
New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean |
title_full |
New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean |
title_fullStr |
New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean |
title_full_unstemmed |
New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean |
title_sort |
new constraints on the physical and biological controls on the silicon isotopic composition of the arctic ocean |
publisher |
Frontiers Media |
publishDate |
2021 |
url |
https://hdl.handle.net/20.500.11850/505293 https://doi.org/10.3929/ethz-b-000505293 |
geographic |
Arctic Arctic Ocean Bering Strait Canada Chukchi Sea North Pole Pacific |
geographic_facet |
Arctic Arctic Ocean Bering Strait Canada Chukchi Sea North Pole Pacific |
genre |
Arctic Arctic Ocean Bering Strait canada basin Chukchi Chukchi Sea North Pole |
genre_facet |
Arctic Arctic Ocean Bering Strait canada basin Chukchi Chukchi Sea North Pole |
op_source |
Frontiers in Marine Science, 8 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2021.699762 info:eu-repo/semantics/altIdentifier/wos/000692527300001 http://hdl.handle.net/20.500.11850/505293 doi:10.3929/ethz-b-000505293 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/50529310.3929/ethz-b-00050529310.3389/fmars.2021.699762 |
_version_ |
1768381561266241536 |