©2020 Biological and Chemical Oceanography Data Management Office.Funded by the U.S. National Science Foundation
©2020 Biological and Chemical Oceanography Data Management Office.Silicon isotopes have proven to be a powerful tool for understanding silica cycling on unprecedented spatial and temporal scales in the modern ocean. This dataset contains profiles of silicon isotopes for samples collected from surface to depth at most stations along the GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214), from Tahiti south across the Antarctic Circumpolar Current to 67S, then east towards Chile.
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Sampling of silicon (Si) isotopes followed GEOTRACES sampling protocols for Si isotopes (Cutter et al., 2010). Seawater (0.5 to 2 liters (L)) was collected using the conventional CTD rosette. Seawater was filtered directly from Niskin bottles through silicone tubing plumbed with an inline Acropak filter cartridge (0.8/0.45 micrometer (μm) Supor filter) into acid-cleaned polyethylene bottles. This protocol was used for Si isotopes on previous GEOTRACES cruises. Filtered samples are stored at ambient temperature in the dark and shipped to UCSB for processing.
Silicon preparations were analyzed at UCSB using a Nu Perspective IRMS with a NuSil sample introduction system, following the methods of Brzezinski, et al. (2025). See the Supplemental Files for additional information describing methods.
Brzezinski, M. A., Closset, I., Middleton, J. (2026). Silicon stable isotopes for samples collected from surface to depth on the US GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214) from December 2022 to January 2023. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2026-01-16 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/991532 [access date]
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This dataset is licensed under Creative Commons Attribution 4.0.
If you wish to use this dataset, it is highly recommended that you contact the original principal investigators (PI). Should the relevant PI be unavailable, please contact BCO-DMO (info@bco-dmo.org) for additional guidance. For general guidance please see the BCO-DMO Terms of Use document.