This data set was acquired with a ship-based Kongsberg EM120 Multibeam Sonar system during Nathaniel B. Palmer expedition NBP0409 conducted in 2004 (Chief Scientist: Dr. Ronald Kiene; Investigator(s): Dr. John Anderson). These data files are of MBSystem Compatible format and include Acoustic Backscatter, Swath Bathymetry, and Sidescan data that have not been processed. Data were acquired as part of the project(s): Impact of solar radiation and nutrients on biogeochemical cycling of DMSP and DMS in the Ross Sea, and funding was provided by NSF grant(s): OPP02-30497 and OPP02-30499.