Cadmium flux in Los Angeles/Long Beach harbours and at sites along the California continental margin

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Colbert, D., Coale, K. H., Berelson, W. M., & Johnson, K. S. (2001). Cadmium flux in Los Angeles/Long Beach harbours and at sites along the California continental margin. Estuarine, Coastal and Shelf Science, 53(2), 169-180. doi:10.1006/ecss.2001.0802
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TitleCadmium flux in Los Angeles/Long Beach harbours and at sites along the California continental margin
AuthorsD. Colbert, K. Coale, W. Berelson, K. Johnson
AbstractFluxes of dissolved cadmium were measured in situ using benthic flux chambers at stations in Los Angeles/Long Beach harbour and at sites on the California continental margin. Cadmium fluxes ranged from -0.212 to 0.118 μmol m-2 d-1 indicating that Cd flux may either be into or out of sediments. Correlations between Cd flux and carbon oxidation rate and between carbon oxidation rate and sulfate reduction indicate that anaerobic microbial degradation was the major process controlling both the sign and the magnitude of cadmium fluxes at stations in Los Angeles and Long Beach harbours. A simple box model based on sediment fluxes and water column concentrations indicates cadmium has a residence time of 47 days within the Los Angeles/Long Beach harbour system, similar to the hydraulic residence time. Sedimentary flux is, therefore, sufficient to account for water column cadmium concentration in inner harbour areas, suggesting that the sediments are the dominant source and sink of cadmium in these areas of the harbour. Comparison of the cadmium: phosphate ratio for the Los Angeles/Long Beach harbour water column with those reported for the northeast Pacific suggests that distributions of Cd in the study area were elevated over expected values but appear to be dominated by natural physical and biogeochemical processes. © 2001 Academic Press.
JournalEstuarine, Coastal and Shelf Science
Date2001
Volume53
Issue2
Start page169
End page180
ISSN0272-7714
Subjectscadmium, continental margin, flux measurement, harbor, sediment analysis, source-sink dynamics, Pacific Ocean, United States
NoteCited By (since 1996):9, Oceanography, CODEN: ECSSD

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