Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Alkor	AL619	02.09.2024 - 10.09.2024		Baltic Sea

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Krastel Sebastian	Institut fur Geophysik der Universitat Kiel	Kiel	Kiel

Ziel der Reise / Objectives of Cruise:

ALKOR Cruise AL619 was conducted as a marine geophysical field trip for students of the BSc degree program `Physik des Erdsystems? at Kiel University. The primary goal was to provide hands-on experience and training in marine geophysical data collection, including the deployment of scientific gear, data processing, interpretation, and presentation. The cruise took place from September 2nd to 10th, 2024, in the Western Baltic Sea, starting and ending at the GEOMAR berth in Kiel. Survey areas included the Bay of Kiel, the region between Heiligenhafen and Fehmarn, a marine protected area northwest of Fehmarn Belt and the Bay of Eckernforde. Bathymetric mapping, sub-bottom profiling, and seismic surveys were conducted to study the morphology and subsurface of the seafloor including natural and anthropogenic features, the structure of sedimentary basins, and glacial structures. Additional grab samples were collected to ground-truth the geophysical data, while several gravity cores were recovered to establish a sedimentary stratigraphy for the seismically imaged basins. In addition, small-scale video footage of the seafloor was collected with a remotely operated underwater vehicle (ROV). Detailed investigations included the study of anthropogenic influences on seafloor morphology, methane seepage in the Bay of Eckernforde, and potential tunnel valleys buried beneath the seafloor. Multiple conductivity, temperature, and depth (CTD) measurements were taken throughout the cruise to mainly account for high sound velocity profile variability and to assist in postprocessing of the collected bathymetric data. The cruise also served as a training opportunity in regard to habitat mapping using modern multibeam sonar technologies for participants from the Federal Agency for Nature Conservation (BfN).

Messungen / Measurements