Gridded bathymetry off South Georgia from multibeam echosounder ATLAS HS-DS3 acquired on RV POlARSTERN cruise ANT-XXIX/4 ...

• Main Authors: Wintersteller, Paul, Graham, Alastair G C, dos Santos Ferreira, Christian, Römer, Miriam
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: File content; File name; File format; File size; Uniform resource locator/link to file; Underway cruise track measurements; ANT-XXIX/4; Polarstern; Center for Marine Environmental Sciences MARUM; Antarc*; Antarctic; Scotia Sea; South Atlantic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.870752; https://doi.pangaea.de/10.1594/PANGAEA.870752

Leg 4 of POLARSTERN cruise 29 was dedicated to the eastern Scotia Sea which is part of the antarctic South Atlantic Ocean. Main goal were investigations on fluid and gas circulation of the Sandwich Microplate. Recent investigations have proved hydrothermal and volcanic activities at the backarc spreading center. In contrast active fluid seepage in the forecarc between the island arc and deep sea trench was completely unknown and therefore a target of investigation on this expedition. Besides this, marine geoscientific work south of Falkland and around South Georgia was carried out and provided new insights to shallow gas seepage on the shelf of South Georgia. ... : The ATLAS HYDROSWEEP DS3 MBES was used for all multibeam survey. It is a nominal 15kHzs deep-water system, with water-column imaging capability, and 2 x 2 degree resolution, protected with a shatterproof window with respect to the icebreaker class of RV POLARSTERN.The system upgrade from generation DS2 to DS3 just happened on this cruise. The new functionality allowed for recording of up to 313 hard-beams and 920 soft-beams, depending on the water depth. The upgrade also contained a new module to investigate the water column online. This so called ATLAS Hydro-Viewer has been installed on a second acquisition computer and is receiving the signal via UDP from the processing unit. The tool is essential when looking for gas flares while mapping the sea floor. We note that despite some initial performance issues, gas flares were found on the first trials of the DS3 on Polarstern.Due to partial bad weather conditions the quality of the bathymetric data set is between fair and good. In addition, residual artefacts ...