Hölz, Sebastian , Perner, Mirjam , Adam-Beyer, Nicole, Schmitz, Wanda, Türk, Matthias, Wenzel-Storjohann, Arlette , Leibold, Patrick, Diller, Nikolaj, Jäkle, Anna, Kurbjuhn, Torge and Scheppukat, Danilo (2023) Bathymetric and microbial investigations at the Grimsey Vent Field (Iceland), Cruise No. AL595, 31.5. – 20.6.2023, Kiel (Germany) – Grimsey Vent Field (Iceland) – Kiel (Germany) AUV@GVF. . Alkor-Berichte, AL595 . GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany, 70 pp. DOI 10.3289/CR_AL595.

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Abstract

During research cruise AL595 (31.5. - 20.6.2023) onboard research vessel ALKOR, investigations were
carried out at the Grimsey Hydrothermal Field offshore Northern Iceland as part of the Helmholtz
InnoPool project “High CO2 – metabolic responses and bioeconomic opportunities”. For the first time,
the Hover-AUVs Anton and Luise were successfully operated at water depths of up to 400m, which is
close to the maximum operational depth of 500m specified for these Girona 500 AUVs. AUV Anton was
used to measure high resolution multibeam data with a horizontal resolution of approximately 40cm cov-
ering a total area of ca. 1.4km2. AUV Luise acquired five photo-mosaics with sub-centimeter resolution
covering a total area of ca. 5.000m2. In addition, both AUVs carried CTD probes, which will allow to
investigate the local distribution of hydrothermal activity. Both high-resolution bathymetry and pho-
togrammetry data yield new insights into the morphology and overall structure of the vent site and its
surrounding, which will be valuable for the interpretation of geophysical data previously acquired in the
working area. Sampling with a multicorer (three successful deployments), a 300cm long gravity corer
(five successful deployments), a BIGO lander (two successful deployments) and casts with the CTD-
rosette (seven deployments) generated fluid, pore-fluid and sediment samples to be analyzed by the
working groups Geomicrobiology and Biogeochemistry, Marine Natural Products and Marine Geochem-
istry at GEOMAR and at Matís (Iceland, Natural Products only). Lab work to be carried out in the home
labs will yield insights into the physiological adaptation of microbial communities and individual
microbes to very high CO2 concentrations and will explore microbial utilization of CO2 for establishing
CO2-based bioeconomic value chains.

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