Deutsches Ozeanographisches
Datenzentrum Inventur der Heincke-Reise HE432 (DOD-Ref-No.20140166)
Inventory of Heincke Cruise HE432 (DOD-Ref-No.20140166)

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

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD
13.7.2019