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. The stable isotope composition of dissolved silicon in seawater( δ30SiDSi ) was examined at 10 stations along the GEOVIDEsection (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 distributionof water masses. Higher δ30SiDSi values are associated withintermediate and deep water masses of northern Atlantic or Arctic Oceanorigin, whilst lower δ30SiDSi values are associated withDSi-rich waters sourced ultimately from the Southern Ocean. Correspondingly,the lowest δ30SiDSi values were observed in the deep andabyssal 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 SeaWater (LSW), whose high δ30SiDSi signature is visible notonly 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 thecirculation of LSW into the eastern North Atlantic, where it overliessouthern-sourced Lower Deep Water. The GEOVIDE δ30SiDSi distribution thus provides a clear view of the direct interaction betweensubpolar/polar water masses of northern and southern origin, and allowexamination of the extent to which these far-field signals influence thelocal δ30SiDSi distribution.

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