ADCP current measurements (38 kHz) during Maria S. Merian cruise MSM88/1


Upper-ocean velocities along the cruise track of Maria S. Merian cruise MSM88/1 were continuously collected by a vessel-mounted Teledyne RD Instruments 38 kHz Ocean Surveyor ADCP. The transducer was located at 6.5 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 50 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. The average interval was set to 60 s. Data post-processing included water track calibration of the misalignment angle (0.44° +/- 0.4694°) and scale factor (1.0008 +/- 0.0083) of the Ocean Surveyor signal.

Velocity quality flagging is based on following threshold criteria: abs(UC) or abs(VC) > 2.0 m/s, rms(UC_z) or rms(VC_z) > 0.3.

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Metadata Access
Creator Devey, Colin W; Kopte, Robert
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2020
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 5749880 data points
Discipline Earth System Research
Spatial Coverage (-47.850W, 14.179S, -28.201E, 16.034N)
Temporal Coverage Begin 2019-11-29T05:01:00Z
Temporal Coverage End 2019-12-16T11:03:00Z