LADCP current velocity data for CTD stations from the BROKE-West voyage of the Aurora Australis, 2006

• Other Authors: AADC (owner), AADC, DATA OFFICER (distributor), AADC, DATA OFFICER (custodian), AU/AADC > Australian Antarctic Data Centre, Australia (hasAssociationWith), Australian Antarctic Data Centre (publisher), Australian Antarctic Division (sponsor), MEIJERS, ANDREW (collaborator), MEIJERS, ANDREW (hasPrincipalInvestigator), MEIJERS, ANDREW (author), Meijers, A. and Klockers, A. (originator)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: oceans; EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS; LADCP; ADCP; STATION; CTD; CURRENT; VELOCITY; PROFILE; NORTH; EAST; COMPONENTS; Lowered Acoustic Doppler Current Profiler; ADCP > Acoustic Doppler Current Profiler; SHIPS; R/V AA > R/V Aurora Australis; AMD/AU; CEOS; AMD; ACE/CRC; OCEAN > SOUTHERN OCEAN; CONTINENT > ANTARCTICA; GEOGRAPHIC REGION > POLAR; Antarc*; Antarctica; aurora australis; Southern Ocean
• Online Access: https://researchdata.edu.au/ladcp-current-velocity-australis-2006/2816175

Progress Code: completed Statement: LADCP data were collected at every CTD station on BROKE-west except for stations 1, 2, and 119. Stations 5,46,91,92 and 96 have only basic LADCP velocities (unconstrained by GPS and ship ADCP data), and stations 68 and 115 have no data as yet due to difficulties in processing the raw data. The LADCP was calibrated before departure. The LADCP final processing makes extensive use of shipboard Acoustic Doppler Current Profiler (ADCP) data which will not be properly calibrated until after the voyage return, and should therefore be regarded as preliminary only and subject to significant change. LADCP reprocessing with properly calibrated ADCP data will be carried out after the voyage. The Lowered Acoustic Doppler Current Profiler (LADCP) data were acquired while the Conductivity Temperature Depth (CTD) sensor was in the water during the Australian 2006 V3 BROKE-west survey. Data Acquisition: The LADCP is mounted on the CTD frame and is lowered through the water column from surface to bottom on each CTD cast. During the cast upward and downward facing sensor heads ensonify the water column with four beams per head, collecting the data necessary to calculate the vertical velocity of the LADCP on the CTD frame, as well as the northward and eastward components of the current relative to the LADCP for the entire water column. Once the LADCP has been retrieved, the data collected in the cast are downloaded to a PC as two raw binary .adp files, one for the upward looking head and one for the downward. This occurs for each CTD cast. The only modification to a normal CTD cast procedure for the LADCP is a 5 minute pause within 50 m of the sea floor on the upcast. This gives the downward sensor time to gather enough data for later determination of relative bottom velocity. The shipboard ADCP is a continuous recording device that operates over the duration of the voyage, ensonifying the water column once a second. It operates in a similar way to the LADCP, except that as it is fixed to the ...