[{"name":"jakobsson-2020-asko-1","title":"Multibeam bathymetry from Fif\u00e5ng Deep and Ask\u00f6fj\u00e4rden, southern Stockholm archipelago","summary":"Multibeam bathymetry collected from Ask\u00f6fj\u00e4rden and Fif\u00e5ng Deep, east of Ask\u00f6 Island in southern Stockholm 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. \r\n\r\nThe data were collected with Stockholm University research vessels (RV) Electra and Skidbladner between 2012 and 2018 for multiple purposes, including all of those mentioned above. Some of the data were collected as a part of a course in marine geophysical mapping at Stockholm University. \r\n\r\nThe multibeam bathymetry is here provided in the form of a compiled Digital Terrain Model with a cell-spacing of 1x1 m. The processing of the raw data was carried out using the Qimera software by QPS. The data have been cleared to be been granted public release by the Swedish Maritime Administration.","citations":"Jakobsson, M., O'Regan, M., M\u00f6rth, C.-M., Stranne, C., Weidner, E., Hansson, J., Gyllencreutz, R., Humborg, C., Elfwing, T., Norkko, A., Norkko, J., Nilsson, B., Sj\u00f6str\u00f6m, A. (2020). Potential links between Baltic Sea submarine terraces and groundwater seeping. Earth Surf. Dynam. 8, 1\u201315. doi:10.5194\/esurf-8-1-2020","comments":"The multibeam bathymetric data available as a processed grid were acquired between 2012 and 2018 during multiple surveys with RV Electra (24.3 m long) and RV Skidbladner (6.4 m long). A Kongsberg EM2040 0.4\u00b0x0.7\u00b0, 200-400 kHz, multibeam echo-sounder is hull mounted in RV Electra and RV Skidbladner has a pole-mounted Kongsberg EM2040 0.7\u00b0x0.7\u00b0, 200-400 kHz multibeam. Both RV Electra and RV Skidbladner receive position, heading and attitude data from Kongsberg-Seatex Seapath 330+ navigation units (GPS and GLONASS) with attached MRU5+ motion and reference sensors. Real-Time Kinematic (RTK) corrections were received from SWEPOS over the internet. Positions have horizontal accuracies estimated to be better than \u00b15 cm and slightly coarser vertical accuracies. A Valeport MiniSVP sound velocity probe was used at discrete stations to acquire sound speed profiles. In addition, both RV Electra and RV Skidbladner have AML sound velocity probes mounted near the transducers for continuous reading of surface sound speed. The data were processed using QPS Qimera (version 1.7.2).","category":"Marine","subcategory":"Bathymetry","keywords":"Multibeam bathymetry; Stockholm archipelago; RV Electra; Groundwater","scientist":"Martin Jakobsson","firstname":"Martin","lastname":"Jakobsson","address":"Department of Geological Sciences, Stockholm University\r\n","postalcode":"SE-106 91","city":"Stockholm","province":"","country":"Sweden","parameters":"Earth science > Oceans > Bathymetry\/seafloor topography","location":"Ocean > Atlantic Ocean > North Atlantic Ocean > Baltic Sea","progress":"Completed","language":"English","project":"These data have mainly been collected during the yearly field work within a course in \"Marine geophysical mapping\" provided by the Department of Geological Sciences, Stockholm University. Hence the data collection is financed by Stockholm University.","publisher":"Bolin Centre Database","version":"1","constrains":"None, but please cite Jakobsson et al. (2020)","access":"Free"}]