Krastel, Sebastian , Schneider von Deimling, Jens, Held, Philipp, Lenz, Kai Frederik, Baumann, Mette Lea, Schulze Glanert, Noemi, Hänsch, Martje, Schmitz, Alexander, Tabelow, Philipp, Thamm, Viktoria and Wordtmann, Kimberly (2020) Baltic Sea Geophysical Student Field Trip Cruise No. AL542, 14.08.2020 – 21.08.2020, Kiel (Germany) – Kiel (Germany), GPF19-1_92. . Alkor-Berichte, AL542 . Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 55 pp. DOI 10.3289/CR_AL542.

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Abstract

The cruise AL542 took place in the Western Baltic Sea in the period 14. – 21.08.2020. The
cruise was carried out as a marine geophysical field course of Kiel University. Starting and
ending point of the cruise was Kiel. One stopover in Kiel took place during the cruise due to an
exchange of parts of the scientific party (18.08.2020). The main aim of the cruise was to
introduce marine geophysical acquisition to the students including hands-on experience in
collecting marine geophysical data. This approach also included a first processing and
interpretation of the data as well as the presentation of the first results.
The main survey area of the first leg of the cruise AL 542 was the Bay of Mecklenburg. In the
eastern part of the bay seismic and acoustic data were collected with the aim to identify historical
coastlines and buried glacial structures. Further, the central part of the bay was mapped with the
multibeam echosounder to find the Blinkerhügel, a small mound with reported accumulation of
manganese nodules, investigated in 2002 by Hlawatsch et al. The Blinkerhügel was clearly
identified as an outcropping ground moraine. Seafloor samples at eight locations were collected
with a grab from the area of the Blinkerhügel. At one location stones with manganese crusts
were successfully retrieved.
The four survey areas of the second leg of the cruise were Mittelgrund, Noer and Damp which
are located in the Eckernförde Bay and an area near Fehmarn which is located in the northwest
of the island in the Fehmarn Sund. In the region Mittelgrund in the Eckernförde Bay a wellknown, developing pockmark field was surveyed with hydroacoustic and seismic methods.
Furthermore, a known pockmark near Noer was surveyed with hydroacoustic methods. From the
third survey area Damp Laminaria agitate algae have been reported. The aim in this area was to
check, if it is possible to detect the algae with the hydroacoustic systems. Additionally, some
video transects and seafloor samples were gathered for ground truthing in this region. In the
survey area near Fehmarn a dynamic dune field was surveyed with hydroacoustic methods. This
dune field is surveyed every year to document changes in the submarine environment.

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