Seawater dissolved chromium concentration, redox speciation, and stable isotope composition in the North Pacific Ocean

• Main Authors: David J Janssen, Jörg Rickli, Paul D Quay, Angelicque E White, Philipp Nasemann, Samuel L Jaccard
• Format: Other/Unknown Material
• Language: English
• Published: Zenodo 2019
• Subjects: Chromium; Chromium redox; Chromium isotopes; Biological productivity; Paleoproxy; GEOTRACES; Subarctic; Alaska
• Online Access: https://doi.org/10.5281/zenodo.3560082

Dissolved seawater chromium concentrations, redox speciation, and stable isotope composition were measured on samples collected in the North Pacific Ocean. Samples were collected over diel cycles (2 for stations 1-5, 1 for station 6) on board the RV Kilo Moana cruise KM1713 from Seward Alaska to Honolulu Hawai’i. Sampling stations spanned the subarctic North Pacific (stations 1 & 2), the dynamic subarctic-subtropical convergence zone (stations 3 and 4) and the subtropical North Pacific (stations 5 and 6). Chromium was enriched from filtered samples by Mg(OH) 2 co-precipitation and analyzed by MC-ICP-MS using either isotope dilution (Cr redox speciation) or double spike methodology. Additional Funding Sources: European Research Council (ERC) Consolidator Grant (SCrIPT – grant agreement number 819139) to SLJ US National Science Foundation (NSF) Chemical Oceanography grant #1850588 to AEW Chromium data were obtained on a Neptune MC-ICP-MS acquired with funds from the NCCR PlanetS supported by SNSF grant 51NF40-141881.