RV POSEIDON Fahrtbericht / Cruise Report POS518: Baseline Study for the Environmental Monitoring of Subseafloor CO2 Storage Operations, Leg 1: Bremerhaven – Bremerhaven (Germany) 25.09.-11.10.2017, Leg 2: Bremerhaven – Kiel (Germany) 12.10.-28.10.2017.

Linke, Peter and Haeckel, Matthias, eds. (2018) RV POSEIDON Fahrtbericht / Cruise Report POS518: Baseline Study for the Environmental Monitoring of Subseafloor CO2 Storage Operations, Leg 1: Bremerhaven – Bremerhaven (Germany) 25.09.-11.10.2017, Leg 2: Bremerhaven – Kiel (Germany) 12.10.-28.10.2017. Open Access . GEOMAR Report, N. Ser. 040 . GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, 84 pp. DOI 10.3289/GEOMAR_REP_NS_40_2018.

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Abstract

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.

During Leg 2 three different benthic lander systems were deployed to obtain baseline
data of oceanographic and biogeochemical parameters for a small research-scale CO2
gas release experiment planned for 2019. The first lander was equipped with an
acoustic Doppler current profiler (ADCP), a CTD and an O2 optode. It was deployed
for 6 days close to Goldeneye to obtain high resolution data which can be linked to the
long-term measurements of the NOC-Lander. This lander is equipped with a suite of
sensors to monitor temperature, conductivity, pressure, current speed and direction,
hydro-acoustic, pH, pCO2, O2 and nutrients over a period of about 10 months with
popup telemetry units for data transmission via IRIDIUM satellite telemetry every 3
months. Two short-term deployments of the Biogeochemical Observatory (BIGO) were
conducted to study the molar ratio between oxygen and CO2-fluxes at the seafloor.
Sediment cores obtained by gravity and multi corer were collected for sediment
biogeochemical analyses and video-CTD casts were used to study the chemistry of
the water column.

Document Type: Report (Cruise Report)
Keywords: RV Poseidon, POS518, Cruise report, subseafloor CO2 storage, Goldeneye platform, central North Sea, ROV PHOCA
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
DOI etc.: 10.3289/GEOMAR_REP_NS_40_2018
Projects: STEMM-CCS
Expeditions/Models/Experiments:
Date Deposited: 24 Jan 2018 09:31
Last Modified: 25 Jan 2018 11:14
URI: http://oceanrep.geomar.de/id/eprint/41706

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