Multibeam bathymetry from southeast of Tvärminne Zoological Station in southern Finland archipelago

Martin Jakobsson

Multibeam bathymetry showing submarine terraces in the seafloor southeast of Tvärminne Zoological Station in southern Finland archipelago. Detailed information about the depth and shape of the seafloor is provided by the acquired multibeam bathymetry. This information is commonly used to study, for example, general seafloor geology, glacial morphology, bottom habitats, and bottom current activities.

The data were acquired with Stockholm University research vessel (RV) Electra in 2017 under Finnish survey permission granted to Tvärminne Zoological Station. The multibeam bathymetry was here collected for the purpose of providing a geospatial framework for habitat studies in the Tvärminne area within The Baltic Bridge initiative, a collaboration project between Stockholm University and Tvärminne Zoological Station, Helsinki University.

The multibeam bathymetry is provided in the form of a compiled Digital Terrain Model with a cell-spacing of 50x50 cm. The processing of the raw data was carried out using the Qimera software by QPS.

Citation

Martin Jakobsson (2020) Multibeam bathymetry from southeast of Tvärminne Zoological Station in southern Finland archipelago. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/jakobsson-2020-tvarminne-1

References

Jakobsson, M., O'Regan, M., Mörth, C.-M., Stranne, C., Weidner, E., Hansson, J., Gyllencreutz, R., Humborg, C., Elfwing, T., Norkko, A., Norkko, J., Nilsson, B., Sjöström, A. (2020). Potential links between Baltic Sea submarine terraces and groundwater seeping. Earth Surf. Dynam. 8, 1–15. https://doi.org/10.5194/esurf-8-1-2020

Data description

The bathymetric data is provided as a processed grid at a resolution of 50x50 cm in reference to the UTM Zone 34 projection. Data are available in one GeoTIFF (.tif) file (2.4 MB). The data is resolved to instantaneous sea level, hence no reference to a geodetic vertical datum is made.

Comments

The multibeam bathymetric data available as a processed grid were acquired in 2017 during a survey with RV Electra (24.3 m long). A Kongsberg EM2040 0.4°x0.7°, 200-400 kHz, multibeam echo-sounder is hull mounted in RV Electra. These data were acquired using the 400 kHz mode. Position, heading and attitude data were acquired from Kongsberg-Seatex Seapath 330+ navigation units (GPS and GLONASS) with attached MRU5+ motion and reference sensors. Real-Time Kinematic (RTK) corrections were received provided over the internet by FinnRef. Positions have horizontal accuracies estimated to be better than ±10 cm and slightly coarser vertical accuracies. A Valeport MiniSVP sound velocity probe was used at discrete stations to acquire sound speed profiles. In addition, RV Electra has an AML sound velocity probe mounted near the transducer for continuous reading of surface sound speed. The data were processed using QPS Qimera (version 1.7.2).