FS Poseidon PO518 Leg1

Cruise summary report

Cruise Info. 
Ship name (ship code)FS Poseidon (06PO)
Cruise identifierPO518 Leg1
Cruise period2017-09-25 — 2017-10-11
Port of departureBremerhaven, Germany
Port of returnBremerhaven, Germany
ObjectivesBaseline Study for the Environmental Monitoring of Subseafloor CO2 Storage Operations

Poseidon cruise 518 (leg 1 and 2) took place in the framework of the Horizon 2020 project STEMM-CCS of the EU. The project's main goal is to develop and test strategies and technologies for the monitoring of subseafloor CO2 storage operations. In this context a small research-scale CO2 gas release experiment is planned for 2019 in the vicinity of the Goldeneye platform located in the British EEZ (central North Sea). Cruise POS518 aimed at collecting necessary oceanographic and biogeochemical baseline data for this release experiment.

During Leg 1 ROV PHOCA was used to deploy MPI's tool for high-precision measurements of O2, CO2 and pH in the bottom water at Goldeneye. In addition, ROV push cores and gravity cores were collected in the area for sediment biogeochemical analyses, and video-CTD casts were conducted to study the water column chemistry. The stereo-camera system and a horizontally looking multibeam echosounder, both, for determining gas bubble emissions at the seafloor were deployed at the Figge Maar blowout crater in the German Bight. Investigations were complemented by hydroacoustic surveys detecting gas bubble leakages at several abandoned wells in the North Sea as well as the Figge Maar. Surface water alkalinity as well as CH4, CO2, and water partial pressures in the air above the sea surface were measured continuously during the cruise.
Chief scientistMatthias Haeckel (GEOMAR Helmholtz Centre for Ocean Research, Kiel (East Shore Campus))
Cruise reportFS Poseidon PO518 Leg1 cruise report poseidon_po518.pdf (12.28 MB) 
NPRCFS Poseidon PO518 Leg1 NPRC poseidon_po518.pdf (0.65 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificCentral North Sea