ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM106

• Main Authors: Fiedler, Björn, Kopte, Robert, Fischer, Tim
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Acoustic Doppler Current Profiler; ADCP; Current velocity; east-west; north-south; DAM_Underway; DAM Underway Research Data; DATE/TIME; DEPTH; water; Echo intensity; relative; LATITUDE; LONGITUDE; Maria S. Merian; MSM106; MSM106_0_Underway-2; MSM106_0_Underway-4; North Atlantic Ocean; Pings; averaged to a double ensemble value; Quality flag; Seadatanet flag: Data quality control procedures according to SeaDataNet (2010); Vessel mounted Acoustic Doppler Current Profiler [75 kHz]; VMADCP-75; WASCAL; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.952429; https://doi.org/10.1594/PANGAEA.952429

Upper-ocean velocities along the cruise track of Maria S. Merian cruise MSM106 were continuously collected by a vessel-mounted Teledyne RD Instruments 75 kHz Ocean Surveyor ADCP. The transducer was located at 6.0 m below the water line. The instrument was operated in three different configurations: 1) broadband mode with 4 m bins and a blanking distance of 2.0 m, with a total of 128 bins, 2) broadband mode with 8 m bins and a blanking distance of 4.0 m, with a total of 100 bins, 3) narrowband mode with 8 m bins and a blanking distance of 4.0 m, with a total of 100 bins. The ship's velocity was calculated from position fixes obtained by the Global Positioning System (GPS). Heading, pitch and roll data from the ship's gyro platforms and the navigation data were used by the data acquisition software VmDas internally to convert ADCP velocities into earth coordinates. Accuracy of the ADCP velocities mainly depends on the quality of the position fixes and the ship's heading data. Further errors stem from a misalignment of the transducer with the ship's centerline. Data post-processing included water track calibration of the misalignment angle (configuration 1: 0.65° +/- 0.5915°, configuration 2: 0.78° +/- 0.5198°, configuration 3: 0.67° +/- 0.6996°) and scale factor (configuration1: 1.0075 +/- 0.0117, configuration 2: 1.0075 +/- 0.0087, configuration 3: 1.0007 +/- 0.0157) of the Ocean Surveyor signal. The average interval was set to 60 s.