ADCP current measurements (38 kHz) during RV METEOR cruise M176/2

• Main Authors: Achterberg, Eric Pieter, Kopte, Robert, Galley, Christopher G
• 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; GPF 21‐2_049; Rainbow Plume; LATITUDE; LONGITUDE; M176/2; M176/2_0_Underway-1; Meteor (1986); 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 [38 kHz]; VMADCP-38; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.946027; https://doi.org/10.1594/PANGAEA.946027

Upper-ocean velocities along the cruise track of RV METEOR cruise M176/2 were continuously collected by a vessel-mounted Teledyne RD Instruments 38 kHz Ocean Surveyor ADCP. The transducer was located at 5.0 m below the water line. The instrument was operated in narrowband mode with 32 m bins and a blanking distance of 16.0 m, while 55 bins were recorded using a pulse of 2.90 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. Data post-processing included water track calibration of the misalignment angle (0.08° +/- 0.5936°) and scale factor (1.0026 +/- 0.0090) of the Ocean Surveyor signal. The average interval was set to 120 s.