Shipboard ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM127
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2024
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| _version_ | 1867170128889643008 |
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| author | Kopte, Robert Bickert, Torsten Berndt, Paul |
| author_facet | Kopte, Robert Bickert, Torsten Berndt, Paul |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | This report describes the processing of current velocities of the upper water column along the cruise track of R/V Maria S. Merian cruise MSM127 collected by a vessel-mounted 75 kHz RDI Ocean Surveyor ADCP. The expedition took place during 18.03.2024- 20.04.2024 from Las Palmas to Las Palmas (Gran Canaria) in the Northern Atlantic. Data were recorded mostly in the EEZs of Mauritania. The main objective of the MSM127 (Bremen Cluster expedition MAURIBO) research expedition was aimed at obtaining long sedimentary records by using the Bremen sea floor drill rig MeBo70. Data acquisition of the ADCP current velocities is supported by the DAM Underway Project and published according to the FAIR principles. The ADCP transducer was located at 6.0 m below the water line. The instrument was operated in broadband mode (WM1) with a bin size of 8.00 m, a blanking distance of 8.00 m, and a total of 100 bins, covering the depth range between 22.0 m and 814.0 m. Attitude data from the ship's motion reference unit were used by the data acquisition software VmDAS internally to convert ADCP beam velocities to geographic coordinates. The Python toolbox OSADCP (version 2.0.0) was used for data post-processing. Single-ping data were screened for bottom signals and, where appropriate, a bottom mask was manually processed. Acoustic Interferences were identified based on outliers in the ADCP echo intensity data. Echo intensity data were cleaned accordingly and affected velocity cells were flagged to be removed prior ensemble-averaging. The ship's velocity was calculated from position fixes obtained by the Global Navigation Satellite System (GNSS), taking into account lever arms of ADCP transducer and GNSS antenna. Accuracy of the derived water 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 processing included water track calibration of the misalignment angle (-47.3549° +/- 0.5297°) and scale factor (1.0080 +/- 0.0090) of the measured velocities. The velocity data were averaged in time using an average interval of 120 s. Depth cells with ensemble-averaged percent-good values below 25% are marked as 'bad data'. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_974246 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Shipboard ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM127 Kopte, Robert Bickert, Torsten Berndt, Paul Current velocity, east-west; Current velocity, north-south; DAM_Underway; DAM Underway Research Data; DataHub; DataHub Earth and Environment of the Helmholtz Association; DATE/TIME; DEPTH, water; Echo intensity; Echo intensity, cleaned; LATITUDE; LONGITUDE; Maria S. Merian; MAURIBO; MSM127; MSM127_0_Underway-5; Percent good pings; 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 [75 kHz]; VMADCP-75 This report describes the processing of current velocities of the upper water column along the cruise track of R/V Maria S. Merian cruise MSM127 collected by a vessel-mounted 75 kHz RDI Ocean Surveyor ADCP. The expedition took place during 18.03.2024- 20.04.2024 from Las Palmas to Las Palmas (Gran Canaria) in the Northern Atlantic. Data were recorded mostly in the EEZs of Mauritania. The main objective of the MSM127 (Bremen Cluster expedition MAURIBO) research expedition was aimed at obtaining long sedimentary records by using the Bremen sea floor drill rig MeBo70. Data acquisition of the ADCP current velocities is supported by the DAM Underway Project and published according to the FAIR principles. The ADCP transducer was located at 6.0 m below the water line. The instrument was operated in broadband mode (WM1) with a bin size of 8.00 m, a blanking distance of 8.00 m, and a total of 100 bins, covering the depth range between 22.0 m and 814.0 m. Attitude data from the ship's motion reference unit were used by the data acquisition software VmDAS internally to convert ADCP beam velocities to geographic coordinates. The Python toolbox OSADCP (version 2.0.0) was used for data post-processing. Single-ping data were screened for bottom signals and, where appropriate, a bottom mask was manually processed. Acoustic Interferences were identified based on outliers in the ADCP echo intensity data. Echo intensity data were cleaned accordingly and affected velocity cells were flagged to be removed prior ensemble-averaging. The ship's velocity was calculated from position fixes obtained by the Global Navigation Satellite System (GNSS), taking into account lever arms of ADCP transducer and GNSS antenna. Accuracy of the derived water 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 processing included water track calibration of the misalignment angle (-47.3549° +/- 0.5297°) and scale factor (1.0080 +/- 0.0090) of the measured velocities. The velocity data were averaged in time using an average interval of 120 s. Depth cells with ensemble-averaged percent-good values below 25% are marked as 'bad data'. |
| title | Shipboard ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM127 |
| topic | Current velocity, east-west; Current velocity, north-south; DAM_Underway; DAM Underway Research Data; DataHub; DataHub Earth and Environment of the Helmholtz Association; DATE/TIME; DEPTH, water; Echo intensity; Echo intensity, cleaned; LATITUDE; LONGITUDE; Maria S. Merian; MAURIBO; MSM127; MSM127_0_Underway-5; Percent good pings; 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 [75 kHz]; VMADCP-75 |
| url | https://doi.org/10.1594/PANGAEA.974246 |