8th International Nannoplankton Association Conference


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Alyssa Peleo-Alampay, Edward S. Lucerno, Martin Wiesner, Christian Gerbich:
Coccolith flux from sediment traps in the South China Sea

The fluxes of calcareous nannoplankton are investigated from sediment-trap samples collected over a 13-month period, from December, 1996 to December, 1997, in the South China Sea. The central station (SCS-C-06) had a trap deployed at 1200m water-depth, while the NE station (SCS-NE-01) had two traps at 1400m and 3500m water-depths. Florisphaera profunda is the most dominant nannoplankton species at all of the trap stations, comprising most of the coccolith flux. Total coccolith flux was highest in the central trap site. In general, the flux of F. profunda is highest during the intermonsoon months and the tail ends of the monsoon season in the central and deep NE traps. This is also shown, to a limited extent, in the shallow NE trap, but peaks in F. profunda flux also occurred within the main phase of the monsoon in this trap. The decrease in flux of F. profunda can be explained by a shallowing of the nutricline as a result of upwelling, which can occur during the main phase of the monsoon. An increase in lithogenic matter flux can also explain the decrease in F. profunda flux because of reduced water-transparency. Among the other coccoliths, Gephyrocapsa oceanica has the highest flux. In general, G. oceanica flux is higher in the central and deep NE traps.


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 [Division of Micropalaeontology] [Department of Geosciences] [Bremen University]

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