NBP09-01 Cruise Report - British Oceanographic Data Centre

Due to the location of the transducers it is likely that they are effected by air bubbles generated by thewaves and ship-sea interactions.The SeaSurveyAdvanced display software allows real-time display of new and pre-existing multibeam data,an essential tool for route and station planning as well as for ship navigation. The additional helmsmandisplay on the bridge allows the mates to steer a course designed to ensure maximum coverage by notduplicating pre-existing data from the NBP, BAS, and AWI. Occasionally there were problems with thissoftware and/or its computer due to age and software. An upgrade or replacement in the near future ishighly recommended.6.4 Results: Swath-BathymetryDuring this cruise we collected and processed 11912 km of multi-beam swath data (540857 pings, 103303687beams (soundings) representing ∼11.9 GigaBytes of data.Figure 28: Preliminary version of the updated Amundsen Sea bathymetry compilation.Most of the newly acquired bathymetry data cover previously uncharted areas, adding significantly to ourunderstanding of the regional bathymetry.Work is needed to reconcile significant swath-map differences between various ships, probably due to variedassumptions about sound velocity. In addition, some earlier MB data have not been ping-edited completely.Pine Island BayAs result of Autosub operations under the Pine Island Ice Shelf the NB Palmer spent ∼two weeks in thisarea and mapped the Pine Island Bay seafloor in some detail. Systematically adding to existing data resultedNBP09-01 Cruise Report (p. 45 of 83) Revised February 27, 2009