ADCP current measurements (75 kHz) during Maria S. Merian cruise MSM96

• Main Authors: Schoening, Timm, Kopte, Robert, Mohrmann, Jochen, Gazis, Iason-Zois
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Acoustic Doppler Current Profiler; ADCP; Calculated; Current velocity; east-west; north-south; DAM_Underway; DAM Underway Research Data; DATE/TIME; DEPTH; water; Echo intensity; relative; GPF 20‐3_088; LATITUDE; LONGITUDE; Maria S. Merian; MSM96; MSM96_0_Underway-4; North Atlantic Ocean; Pings; averaged to a double ensemble value; Quality flag; Vessel mounted Acoustic Doppler Current Profiler; RDI Ocean Surveyor; 75 kHz; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.925938; https://doi.org/10.1594/PANGAEA.925938

Upper-ocean velocities along the cruise track of Maria S. Merian cruise MSM96 were continuously collected by a vessel-mounted Teledyne RD Instruments 75 kHz Ocean Surveyor ADCP. The transducer was located at 6.5 m below the water line. The instrument was operated in narrowband mode with 8 m bins and a blanking distance of 4.0 m, while 100 bins were recorded using a pulse of 1.43 s. 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. The average interval was set to 60 s. Data post-processing included water track calibration of the misalignment angle (-47.18° +/- 0.7276°) and scale factor (1.0064 +/- 0.0121) of the Ocean Surveyor signal.