Particulate cadmium stable isotopes in the subarctic northeast Pacific reveal dynamic Cd cycling and a new isotopically light Cd sink ...
The nutrient-type distribution of dissolved cadmium concentrations (dCd) reflects a biological control in the global ocean, with uptake of dissolved Cd into biogenic particles in surface waters and regeneration of particulate Cd at depth. Depth profiles of dissolved Cd stable isotope composition (dδ...
| Main Authors: | , , , , |
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| Format: | Text |
| Language: | English |
| Published: |
Elsevier
2019
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.7892/boris.130025 https://boris.unibe.ch/130025/ |
| Summary: | The nutrient-type distribution of dissolved cadmium concentrations (dCd) reflects a biological control in the global ocean, with uptake of dissolved Cd into biogenic particles in surface waters and regeneration of particulate Cd at depth. Depth profiles of dissolved Cd stable isotope composition (dδ114/110Cd), while sparse in coverage, exist for most of the major ocean basins, with spatial coverage improving through the efforts of the GEOTRACES program. However, a dearth of similarly resolved particulate δ114/110Cd(pδ114/110Cd) distributions limits our ability to use stable Cd isotopes to better understand Cd cycling in the global ocean. Here we present two pδ114/110Cd depth profiles from the subarctic northeast Pacific which demonstrate more complex δ114/110Cd cycling than dissolved profiles would suggest. Surface pδ114/110Cd, while lighter than surface dδ114/110Cd, is heavy relative to Pacific deepwater and crustal pδ114/110Cd components. Surface particulate and dissolved δ114/110Cd distributions are not ... |
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