©2020 Biological and Chemical Oceanography Data Management Office.This dataset contains results from Niskin bottle samples collected during CTD casts taken for nutrient concentration as well as the N isotopic composition of nitrate (NO3-). Corresponding CTD data measured at the same depths as the bottle samples are also included within the primary data file. CTD casts were carried out at fixed stations along the ship’s track to calibrate float sensor results as well as document variability associated with mesoscale features. The associated cruise on the R...
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Sampling was conducted using a standard Sea-Bird CTD/Niskin rosette system. Hydrographic data were processed with Sea-Bird software following standard procedures. Dissolved oxygen (O₂) was measured with an SBE43 sensor, beam attenuation with a WET Labs C-STAR transmissometer, and fluorescence with a WET Labs ECO fluorometer. Concentrations of nitrate (NO₃⁻), nitrite (NO₂⁻), phosphate (PO₄³⁻), and silicate (SiO₄⁴⁻) were measured at sea using a Seal AQ400 discrete autoanalyzer with standard chemical methods. The isotopic composition of nitrate was determined on samples returned to the laboratory, following the procedures described in Altabet et al. (2019). Samples for nitrate isotope analysis were preserved by mild acidification and the addition of sulfamic acid to remove nitrite. Measurements were made using an IsoPrime isotope ratio mass spectrometer (IRMS) operated with IonVantage software.
Altabet, M. A., D'Asaro, E., McNeil, C. L. (2025). CTD Bottle Data from R/V Sally Ride cruise SR2114 in the Eastern Tropical North Pacific, December 2021–January 2022 (N-loss in the ETNP ODZ project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-09-17 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.984479.1 [access date]
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This dataset is licensed under Creative Commons Attribution 4.0.
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