Dataset: Cr concentration and isotope data using dissolved Cr and different Cr species from RR1805
Data Citation:
Boyle, E. A. (2024) Chromium (Cr) concentration and isotope data determined using dissolved Cr and different Cr species from samples collected on R/V Roger Revelle cruise RR1805 in April-May 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-04-23 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.925569.1 [access date]
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This dataset is licensed under Creative Commons Attribution 4.0.
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DOI:10.26008/1912/bco-dmo.925569.1
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Spatial Extent: N:20.2 E:-106 S:17 W:-107
Eastern Tropical North Pacific
Temporal Extent: 2018-04 - 2018-05
Project:
Cr Isotope Oceanography of the Eastern Tropical North Pacific Ocean
(ETNP Cr Isotopes)
Principal Investigator:
Edward A. Boyle (Massachusetts Institute of Technology, MIT)
Student:
Tianyi Huang (Massachusetts Institute of Technology, MIT)
Simone B. Moos (Massachusetts Institute of Technology, MIT)
BCO-DMO Data Manager:
Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)
Version:
1
Version Date:
2024-04-23
Restricted:
No
Validated:
Yes
Current State:
Final no updates expected
Chromium (Cr) concentration and isotope data determined using dissolved Cr and different Cr species from samples collected on R/V Roger Revelle cruise RR1805 in April-May 2018
Abstract:
Changes in chromium (Cr) isotope ratios due to fractionation between trivalent (Cr(III)) and hexavalent (Cr(VI)) are being utilized by geologists to infer oxygen conditions in past environments. But there is little information available on Cr in the modern ocean to ground-truth these inferences. Transformations between the two chromium redox species are important processes in oceanic Cr cycling. Here we present profiles of hexavalent and trivalent Cr concentrations and stable isotope ratios from the Eastern Tropical North Pacific (ETNP) oxygen deficient zone (ODZ) which support theoretical and experimental studies that predict that lighter Cr is preferentially reduced in low oxygen environments, and that residual dissolved Cr becomes heavier due to removal of particle-reactive Cr(III) on sinking particles. The Cr(III) maximum dominantly occurs in the upper portion of the ODZ, implying that microbial activity (dependent on the sinking flux of organic matter) may be the dominant mechanism for this transformation, rather than a simple inorganic chemical conversion between the species depending on the redox potential.