Publication Date:
2024-06-26
Description:
Upper-ocean velocities along the cruise track of Meteor cruise M185 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 16 m bins and a blanking distance of 16.0 m, while 100 bins were recorded using a pulse of 2.87 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 (0.09° +/- 0.9125°) and scale factor (1.0055 +/- 0.0203) of the Ocean Surveyor signal. The average interval was set to 120 s.
Velocity quality flagging is based on following threshold criteria: abs(UC) or abs(VC) 〉 3.0 m/s, rms(UC_z) or rms(VC_z) 〉 0.3.
Keywords:
ASSOCIATE; Current velocity, east-west; Current velocity, north-south; DAM_Underway; DAM Underway Research Data; DATE/TIME; DEPTH, water; Echo intensity, relative; LATITUDE; LONGITUDE; M185; M185_0_Underway-3; Meteor (1986); Pings, averaged to a double ensemble value; Quality flag, current velocity; Seadatanet flag: Data quality control procedures according to SeaDataNet (2010); Vessel mounted Acoustic Doppler Current Profiler [38 kHz]; VMADCP-38
Type:
Dataset
Format:
text/tab-separated-values, 1764390 data points
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