A preliminary study of the distributions of Cd in the South China Sea
Resource
Continental Shelf Research, (25),297-310
Journal
Continental Shelf Research
Journal Issue
25
Pages
297-310
Date Issued
2004
Date
2004
Author(s)
Chen, H.Y.
Fang, T.H.
Wen, L.S.
DOI
246246/2006111501254694
Abstract
The water column distributions of dissolved cadmium & supporting parameters were determined during a cruise in the South China Sea in October, 2002. The investigation was focused on waters of the shelf & the central basin which have depths of o200m & 42000 m, respectively. In the surface waters, concentrations of Cd were 0.07–0.95 & 0.05–0.15nM for the shelf & central basin, respectively. The spatial distributions in the surface waters show that concentrations of Cd were relatively high in the Pearl River Estuary. In contrast, Cd was totally depleted in surface waters of the deep water basin. This is attributed to the riverine inputs from the East Asian continent in the shelf regions. The influence of riverine input is reduced by dilution process with waters containing low concentrations of Cd waters. In the central basin, vertical profiles of Cd show a nutrient-like distribution which is depleted in the surface, increases with depth to about 1000 m, & that is finally maintained within a narrow concentration range of 0.94–0.99nM in the deep water. Here, the Cd/PO4 ratio was 0.36970.011nM Cd/mM PO4, indicating that the biogeochemical processes of Cd & PO4 are similar to that in marginal seas of the western Pacific Ocean. However, the concentration gradients in surface waters show a southward increase. The results indicate that the relative enrichment of nutrients & the nutricline uplifted sharply in surface waters of the southern SCS.
Subjects
Cadmium
Phosphate
Trace metals
Nutrients
South China Sea
Publisher
Taipei:National Taiwan University Dept Elect Engn
Type
journal article
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