The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean
The stable isotope composition of dissolved silicon in seawater ( δ 30 Si DSi ) was examined at 10 stations along the GEOVIDE section (GEOTRACES GA-01), spanning the North Atlantic Ocean (40–60 ∘ N) and Labrador Sea. Variations in δ 30 Si DSi below 500 m were closely tied to the distribution of wate...
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ftcopernicus:oai:publications.copernicus.org:bg67699 2023-05-15T15:10:30+02:00 The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean Sutton, Jill N. Souza, Gregory F. García-Ibáñez, Maribel I. Rocha, Christina L. 2019-01-11 application/pdf https://doi.org/10.5194/bg-15-5663-2018 https://www.biogeosciences.net/15/5663/2018/ eng eng doi:10.5194/bg-15-5663-2018 https://www.biogeosciences.net/15/5663/2018/ eISSN: 1726-4189 Text 2019 ftcopernicus https://doi.org/10.5194/bg-15-5663-2018 2019-12-24T09:49:52Z The stable isotope composition of dissolved silicon in seawater ( δ 30 Si DSi ) was examined at 10 stations along the GEOVIDE section (GEOTRACES GA-01), spanning the North Atlantic Ocean (40–60 ∘ N) and Labrador Sea. Variations in δ 30 Si DSi below 500 m were closely tied to the distribution of water masses. Higher δ 30 Si DSi values are associated with intermediate and deep water masses of northern Atlantic or Arctic Ocean origin, whilst lower δ 30 Si DSi values are associated with DSi-rich waters sourced ultimately from the Southern Ocean. Correspondingly, the lowest δ 30 Si DSi values were observed in the deep and abyssal eastern North Atlantic, where dense southern-sourced waters dominate. The extent to which the spreading of water masses influences the δ 30 Si DSi distribution is marked clearly by Labrador Sea Water (LSW), whose high δ 30 Si DSi signature is visible not only within its region of formation within the Labrador and Irminger seas, but also throughout the mid-depth western and eastern North Atlantic Ocean. Both δ 30 Si DSi and hydrographic parameters document the circulation of LSW into the eastern North Atlantic, where it overlies southern-sourced Lower Deep Water. The GEOVIDE δ 30 Si DSi distribution thus provides a clear view of the direct interaction between subpolar/polar water masses of northern and southern origin, and allow examination of the extent to which these far-field signals influence the local δ 30 Si DSi distribution. Text Arctic Arctic Ocean Labrador Sea North Atlantic Southern Ocean Copernicus Publications: E-Journals Arctic Arctic Ocean Southern Ocean Biogeosciences 15 18 5663 5676 |
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Copernicus Publications: E-Journals |
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English |
description |
The stable isotope composition of dissolved silicon in seawater ( δ 30 Si DSi ) was examined at 10 stations along the GEOVIDE section (GEOTRACES GA-01), spanning the North Atlantic Ocean (40–60 ∘ N) and Labrador Sea. Variations in δ 30 Si DSi below 500 m were closely tied to the distribution of water masses. Higher δ 30 Si DSi values are associated with intermediate and deep water masses of northern Atlantic or Arctic Ocean origin, whilst lower δ 30 Si DSi values are associated with DSi-rich waters sourced ultimately from the Southern Ocean. Correspondingly, the lowest δ 30 Si DSi values were observed in the deep and abyssal eastern North Atlantic, where dense southern-sourced waters dominate. The extent to which the spreading of water masses influences the δ 30 Si DSi distribution is marked clearly by Labrador Sea Water (LSW), whose high δ 30 Si DSi signature is visible not only within its region of formation within the Labrador and Irminger seas, but also throughout the mid-depth western and eastern North Atlantic Ocean. Both δ 30 Si DSi and hydrographic parameters document the circulation of LSW into the eastern North Atlantic, where it overlies southern-sourced Lower Deep Water. The GEOVIDE δ 30 Si DSi distribution thus provides a clear view of the direct interaction between subpolar/polar water masses of northern and southern origin, and allow examination of the extent to which these far-field signals influence the local δ 30 Si DSi distribution. |
format |
Text |
author |
Sutton, Jill N. Souza, Gregory F. García-Ibáñez, Maribel I. Rocha, Christina L. |
spellingShingle |
Sutton, Jill N. Souza, Gregory F. García-Ibáñez, Maribel I. Rocha, Christina L. The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean |
author_facet |
Sutton, Jill N. Souza, Gregory F. García-Ibáñez, Maribel I. Rocha, Christina L. |
author_sort |
Sutton, Jill N. |
title |
The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean |
title_short |
The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean |
title_full |
The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean |
title_fullStr |
The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean |
title_full_unstemmed |
The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean |
title_sort |
silicon stable isotope distribution along the geovide section (geotraces ga-01) of the north atlantic ocean |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-15-5663-2018 https://www.biogeosciences.net/15/5663/2018/ |
geographic |
Arctic Arctic Ocean Southern Ocean |
geographic_facet |
Arctic Arctic Ocean Southern Ocean |
genre |
Arctic Arctic Ocean Labrador Sea North Atlantic Southern Ocean |
genre_facet |
Arctic Arctic Ocean Labrador Sea North Atlantic Southern Ocean |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-15-5663-2018 https://www.biogeosciences.net/15/5663/2018/ |
op_doi |
https://doi.org/10.5194/bg-15-5663-2018 |
container_title |
Biogeosciences |
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15 |
container_issue |
18 |
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5663 |
op_container_end_page |
5676 |
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1766341525666529280 |