Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Poseidon	POS464	03.02.2014 - 19.02.2014		NW Atlantic (Limit 40?W)

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Fischer Gerhard	Universitat Bremen, Zentrum fur Marine Umweltwissenschaften	Las Palmas	Las Palmas

Ziel der Reise / Objectives of Cruise:

We performed optical, microbial, biological and geochemical studies in the water column as well as the exchange of two sediment trap moorings off Cape Blanc (CB and CBi). Both were planned as long-term study sites in an important coastal upwelling filament (Eastern Boundary Upwelling Ecosystem) with strong productivity gradients: CB as a mesotrophic site has started in 1988 and CBi as a eutrophic site monitors particle flux since 2003. Both were deployed during RV POS 445 cruise in January 2013. Further, we deployed 4 drifting arrays with cylindrical traps for 1-2 days each, combined with a newly developed Driftcam on an E-W transect between the two long-term sediment trap mooring sites. Additionally, a particle camera was launched to measure the distribution and size of marine snow aggregates and other larger particles. For the sampling of suspended particles, we used in situ-pumps which collect fine particles in larger quantities, generally overnight. To study zooplankton abundance and distribution, we used the multinet with 5 nets, if possible for day- and night hauls to consider dial vertical migration of zooplankton. The studies were completed by roller tank incubation experiments with artificial marine snow aggregates of which respirations rates and sinking rates were determined. For the first time, we did sampling to investigate the nitrogen cycle within marine snow aggregates. Weather conditions were not optimal during the entire cruise and we had winds mostly with 6-8 on the Beaufort scale. Despite these conditions, we worked on 11 stations on a E-W transect off Cape Blanc, deploying and recovering four long-term moorings and four drifting arrays. The other deployments were: multinet (6x), hand net (4x), Secchi disk (5x), ParCa-CTD (17x), rosette-CTD (13x) and the in situ-pumps (4x overnight), in total 65 deployments. We could fulfil more than we expected and had a very successful cruise.

Messungen / Measurements

Verankerungen / Moorings