[A-OS12] Marine ecosystems and biogeochemical cycles: theory, observation and modeling

[AOS12-P06] Numerical study on seasonality of ocean litters collected at the Dongsha Island in the northern South China Sea

*Yi-Chia Hsin¹、Chia-Ying Ko²、Ming-Shiou Jeng³ (1.Research Center for Environmental Changes, Academia Sinica、2.Institute of Fisheries Science, National Taiwan University、3.Biodiversity Research Center, Academia Sinica)

キーワード：ocean litters, numercial study, South China Sea

Distribution of ocean litters collected at the Dongsha Island, an isolated island in the northern South China Sea, shows a significant seasonal change. More litters were accumulated in the northern (southern) part of the island in winter (summer). By means of backward-tracking simulation by considering the effect of both ocean currents and winds (i.e., windage), a series of numerical experiments are carried out to clarify the possible source and mechanisms for the observational seasonal change of litters. Results exhibit that, in winter, low-windage litters are mainly from the western Philippine Sea via the Luzon Strait while the high-windage ones are contributed from the Taiwan Strait. In summer, litters from the southwestern South China Sea, i.e. east of Vietnam, could be a major origin.