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The silicon stable isotope distribution along the GEOVIDE section (GEOTRACES GA-01) of the North Atlantic Ocean

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doi: 10.5194/bg-15-5663-2018
Authors:Sutton, Jill N.; de Souza, Gregory F.; García-Ibáñez, Maribel I.; de la Rocha, Christina L.
Author Affiliations:Primary:
Université de Brest, LEMAR, IUEM, Plouzane, France
ETH Zurich, Institute of Geochemistry and Petrology, Switzerland
Uni Research Climate, Bjerknes Centre for Climate Research, Norway
Volume Title:Biogeosciences
Source:Biogeosciences, 15(18), p.5663-5676. Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726-4170
Publication Date:2018
Note:In English. 66 refs.; illus., incl. 3 tables, sketch map
Summary:The stable isotope composition of dissolved silicon in seawater (δ30SiDSi) 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 δ30SiDSi below 500 m were closely tied to the distribution of water masses. Higher δ30SiDSi values are associated with intermediate and deep water masses of northern Atlantic or Arctic Ocean origin, whilst lower δ30SiDSi values are associated with DSi-rich waters sourced ultimately from the Southern Ocean. Correspondingly, the lowest δ30SiDSi 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 δ30SiDSi distribution is marked clearly by Labrador Sea Water (LSW), whose high δ30SiDSi 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 δ30SiDSi and hydrographic parameters document the circulation of LSW into the eastern North Atlantic, where it overlies southern-sourced Lower Deep Water. The GEOVIDE δ30SiDSi 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 δ30SiDSi distribution.
Subjects:Isotope ratios; Isotopes; Si-30/Si-28; Silica; Silicon; Stable isotopes; Water; Atlantic Ocean; Labrador Sea; North Atlantic; Irminger Sea
Coordinates:N000000 N750000 E0200000 W0800000
Record ID:843181-10
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany
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