Neuer, S. University of Bremen,
Davenport, R. University of Bremen,
Freudenthal, T. Universtity of Bremen,
Meggers, H. University of Bremen,
Sprengel, C. University of Bremen,
Llinas, O. Instituto Canario de Ciencias Marinas,
Nave, S. Instituto Geologico e Mineiro,

Neuer, S., Davenport, B., Freudenthal, T., Meggers, H., Sprengel, C. and Wefer, G., University of Bremen, Department of Geosciences, Klagenfurter Str., 28359 Bremen, Germany, Llinas, O., M.-J. Rueda, Instituto Canario de Ciencias Marinas, Telde, Gran Canaria, Nave, S. and Abrantes, F., Instituto Geologico e Mineiro, 2720 Alfragide, Portugal, We present results from three particle trap moorings located along a quasi zonal productivity gradient at about 29 N reaching from the Moroccan upwelling region to the oligotrophic north-Atlantic gyre. Highest particle flux was related to the winter bloom at all stations, and was highest at the site closest to the shelf. Despite differences in phytoplankton biomass and overall productivity at the 2 stations distant from the coast, particle flux was comparable at both sites and furthermore increased with depth. This indicates that deep particle advection plays an important role in particle flux processes along the entire transect. The additional material probably originates from the extensive Cap Ghir filament to the north which occurs year-round as shown by recent SeaWIFS images. The winter bloom peaks in all traps were perfectly synchronized, indicating that large scale processes such as bloom formation and sedimentation were occurring on a similar temporal scale along the transect. We will also report on the stable nitrogen ratio of the particles and the flux of silica-and carbonate bearing plankton to further elucidate on the role and origin of lateral particle input in this region.
Day: Friday, Feb. 5
Time: 11:00 - 11:15am
Location: Sweeney Center
Code: CS55FR1100S