| 2 | Sources and transport of particulate organic carbon in the Amazon River and its estuary显示文摘Stable carbon isotope ratios have been used to study the sources of particulate organic carbon(POC) in the Amazon River and its tributaries, and to examine the transport of the riverine POC intothe oceanic environment. POC in the upper reaches of the Amazon River has more positive δ 13C values(--24.5‰ to -- 28.0‰) than that in the middle and lower reaches (--27.9‰ to -- 30.1‰). Theδ 13C of POC from the tributaries is generally more negative than that observed in the Amazon mainchannel. This δ 13C datum shows that the POC in the Amazon main channel is predominantly of terres-trial origin rather than a result of in situ production. A large range of δ 13C values (--17.5‰ to -28.4‰) is observed in the Amazon Estuary and plume. and is considered as the result of the | Cai Deling F.C.Tan J.M.Edmond | 1989 | Acta Oceanologica Sinica1989，8，4： | 1 |
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