Distribution and Origin estimate of Perfluoro compounds (PFCs) in East China Sea
PFCs distribution in water and sediment as well as water mass structures were observed at the stations in the East China Sea and its adjacent continental shelf edge in December 2008．In surface water, the concentration of PFHxA, PFHpA, PFOA and PFOS were relatively higher in the southern area, while PFNA concentration was higher in the northern area. In sediment samples, three types of PFCs distribution were obtained : PFOS and PFHpA showed higher concentration in Kuroshio upstream area ; peak concentration of PFNA and PFUnA were observed in Okinawa Trough ; PFHxA and PFOA showed relatively high concentration in shallower side of the continental shelf edge. Based on the distributions of PFCs, sources of particulate PFCs inside the Kuroshio water were estimated. Particulate PFHpA and PFOS were loaded to the Kuroshio water mass from more upstream of Kuroshio Current than the study area suspended PFNA was from the East China Sea continental shelf, according to the particle transportation excess the continental shelf edge particulate PFHxA and PFOA were from both the upstream of Kuroshio Current and the continental shelf. Using PFHxA, PFHpA, PFOA and PFOS as tracers, the origin of suspended solid contained inside the Kuroshio water was examined with a mixing model. The result suggested that almost all of suspended solid loaded from upstream of the Kuroshio Current disappeared from the water column in the middle reach of the Kuroshio in the East China Sea while all of suspended solid found in the Tokara Strait were originated from the East China Sea continental shelf. Key words : PFCs distribution, East China Sea, Kuroshio, origin of PFCs, origin of suspended solid
| Main Authors: | , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
2011
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| Online Access: | http://hdl.handle.net/1834/15675 |
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| Summary: | PFCs distribution in water and sediment as well as water mass structures were observed at the stations in the East China Sea and its adjacent continental shelf edge in December 2008．In surface water, the concentration of PFHxA, PFHpA, PFOA and PFOS were relatively higher in the southern area, while PFNA concentration was higher in the northern area. In sediment samples, three types of PFCs distribution were obtained : PFOS and PFHpA showed higher concentration in Kuroshio upstream area ; peak concentration of PFNA and PFUnA were observed in Okinawa Trough ; PFHxA and PFOA showed relatively high concentration in shallower side of the continental shelf edge. Based on the distributions of PFCs, sources of particulate PFCs inside the Kuroshio water were estimated. Particulate PFHpA and PFOS were loaded to the Kuroshio water mass from more upstream of Kuroshio Current than the study area suspended PFNA was from the East China Sea continental shelf, according to the particle transportation excess the continental shelf edge particulate PFHxA and PFOA were from both the upstream of Kuroshio Current and the continental shelf. Using PFHxA, PFHpA, PFOA and PFOS as tracers, the origin of suspended solid contained inside the Kuroshio water was examined with a mixing model. The result suggested that almost all of suspended solid loaded from upstream of the Kuroshio Current disappeared from the water column in the middle reach of the Kuroshio in the East China Sea while all of suspended solid found in the Tokara Strait were originated from the East China Sea continental shelf.
Key words : PFCs distribution, East China Sea, Kuroshio, origin of PFCs, origin of suspended solid |
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