CAGE13-5 Cruise Report: Investigation of glacial geomorphology in the Storfjordrenna.

• Published in: CAGE – Centre for Arctic Gas Hydrate, Environment and Climate Report Series
• Main Author: Andreassen, Karin
• Format: Article in Journal/Newspaper
• Language: English
• Published: Septentrio Academic Publishing 2023
• Subjects: glacial history; geophysical surveying; sediment coring; gas sampling; Arctic; Barents Sea; Storfjordbanken; Storfjordrenna; Svalbard; Tromsø; GlaciBar; Ice Sheet; University of Tromsø
• Online Access: https://septentrio.uit.no/index.php/cage/article/view/6845; https://doi.org/10.7557/cage.6845

The course GEO‐8144/3144 Marine geology and geophysics cruise, taught at the University of Tromsø, is part of the obligatory courses to be completed by PhD students affiliated with the AMGG research school and yields 5 credits (ECTS). Participants include scientific staff and students. This cruise was conducted within the framework of the Norwegian Science Council (NFR) project Glaciations in the Barents Sea area (GlaciBar) and the trainee school in Arctic Marine Geology and Geophysics (AMGG) financed by the University of Tromsø. The cruise was funded by AMGG. The main target areas are the Storfjordbanken and Storfjordrenna south of Svalbard. The cruise addressed marine glacigenic processes of the areas, with a focus on the last glacial-interglacial cycle in order to reconstruct in a more detail way the retreat of the Barents Sea–Svalbard Ice Sheet. To collect data have been used different methods and instruments, which will be described in a more detailed way in chapter 3. Below here there is only an overview: Multibeam echo sounder: Sound-wave beams are transmitted in a fan perpendicular to the ship track from a hull-mounted echo sounder. Produces high-resolution seafloor bathymetry. Chirp: High-resolution acoustic profiling. CTD (Conductivity, Temperature, Depth): Sensors installed in a frame measure CTD properties of the water column. Generally used for oceanographic studies, but here mainly to calibrate the multibeam data from calculated velocities. 2D seismic: GI airguns and hydrophone cable (streamer). Sediment coring: Gravity coring. Gas sample collection. The targeted study area is under-explored compared to similar areas (Bjørnøyrenna) in the SW Barents Sea. The study areas in the Storfjordrenna and Stordfjorbanken are shown. Several different features have been identified on the seafloor, like MSGLs, grounding zone wedges, flares, pockmarks and ploughmarks. All these features will be described in detail in chapter 4. In addition, 9 gravity cores were acquired in areas likely to provide information on ...