Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Heincke	HE432	13.09.2014 - 27.09.2014	NOAH	North Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Holtappels Moritz	Universitat Bremen, Zentrum fur Marine Umweltwissenschaften	Bremerhaven	Bremerhaven

Ziel der Reise / Objectives of Cruise:

We conducted a research cruise to investigate the effect of advective porewater transport on microbially mediated biogeochemical processes in permeable sediments of the German Bight. Advective porewater flow is known to significantly increase benthic mineralization and nutrient transformation rates, which are diffusion limited in cohesive sediments. Assessing the effect of advective transport is, however, complicated by dynamic sediment-water interactions. We applied benthic Landers for high resolution measurements of bottom water hydrodynamics, small scale seabed topography, O2 penetration depth and benthic O2 uptake. We seek to understand the interaction between permeable sediments, hydrodynamics and the resulting advective porewater transport to finally determine the combined effect on benthic microbial diversity and biogeochemical processes such as organic matter (OM) mineralization and denitrification. Stations with different sediment properties, water depths and water column nutrient concentrations were investigated to estimate the range of boundary conditions that allow enhanced microbial turnover rates. On board experiments focused on the microbial activity and its adaptation to highly variable redox conditions induced by the dynamic porewater flow.

Messungen / Measurements