Abstract
Stable carbon isotope ratios have been used to study the sources and transport of particulate organic carbon (POC) in the Changjiang estuary and the East China Sea. δ 13C values of POC collected during the period of high water discharge (June 1980) show a range of −25·4 to −19·7 ppt, suggesting mixing of riverine and marine organic carbon. Samples collected during the low water discharge period (November 1981) have a δ 13C range of −26·6 to −23·7 ppt, indicative of dominant terrestrial organic carbon contribution. The sedimentary organic carbon in the East China Sea exhibits a relatively narrow δ 13C range (−22·9 to −20·8 ppt) suggesting a dominant marine source.
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