ADCP current measurements (38 kHz) during RV MARIA S. MERIAN cruise MSM107

Upper-ocean velocities along the cruise track of Maria S. Merian cruise MSM107 were continuously collected by a vessel-mounted Teledyne RD Instruments 38 kHz Ocean Surveyor ADCP. The transducer was located at 6.0 m below the water line. The instrument was operated in narrowband mode with 32 m bins a...

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Bibliographic Details
Main Authors: Iversen, Morten Hvitfeldt, Kopte, Robert, Lefebvre, Alice, Miramontes, Elda, Schwenk, Tilmann, Bernhard, Renée
Format: Dataset
Language:English
Published: PANGAEA 2023
Subjects:
Current velocity
east-west
north-south
DAM_Underway
DAM Underway Research Data
DATE/TIME
DEPTH
water
Echo intensity
relative
LATITUDE
LONGITUDE
Maria S. Merian
MSM107
MSM107_0_Underway-7
North Atlantic Ocean
ORGMAT
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.956558
https://doi.org/10.1594/PANGAEA.956558
Description
Summary:Upper-ocean velocities along the cruise track of Maria S. Merian cruise MSM107 were continuously collected by a vessel-mounted Teledyne RD Instruments 38 kHz Ocean Surveyor ADCP. The transducer was located at 6.0 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 50 bins were recorded using a pulse of 2.85 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 (0.34° +/- 0.9292°) and scale factor (0.9996 +/- 0.0145) of the Ocean Surveyor signal. The average interval was set to 60 s. Velocity quality flagging is based on following threshold criteria: abs(UC) or abs(VC) > 1.5 m/s, rms(UC_z) or rms(VC_z) > 0.3.

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