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Achterberg, Eric Pieter; Kopte, Robert; Czeschel, Rena (2023): Shipboard ADCP current measurements (75 kHz) during RV SONNE cruise SO298 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.963747

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Published: 2023-12-07 • DOI registered: 2024-01-05

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Abstract:
Current velocities of the upper water column along the cruise track of R/V Sonne cruise SO298 were collected by a vessel-mounted 75 kHz RDI Ocean Surveyor ADCP. The ADCP transducer was located at 6.0 m below the water line. The instrument was operated in narrowband mode (WM10) with a bin size of 8.00 m, a blanking distance of 4.00 m, and a total of 100 bins, covering the depth range between 18.0 m and 810.0 m. Heading, pitch and roll data from the ship's motion reference unit and the navigation data from the Global Positioning systems were used by the data acquisition software VmDAS internally to convert ADCP velocities into earth coordinates. Single-ping data / ping ensembles were screened for bottom signals and, where appropriate, a bottom mask was manually processed. The ship's velocity was calculated from position fixes obtained by the Global Positioning System (GPS). 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 (-0.1294° +/- 0.3975°) and scale factor (0.9979 +/- 0.0094) of the Ocean Surveyor signal. The velocity data were averaged in time using an average interval of 60 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) > 0.2.
Related to:
Achterberg, Eric Pieter; Kopte, Robert; Czeschel, Rena (2023): Shipboard ADCP current measurements (38 kHz) during RV SONNE cruise SO298 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.963748
Other version:
nc file: ADCP current measurements (75 kHz) during RV SONNE cruise SO298 (2023). so_298_vmadcp_75khz.nc
Data processing report:
Kopte, Robert (2023): Upper-ocean acoustic Doppler current profiler (75kHz-ADCP) underway measurements during SONNE cruise SO298. Institute of Geosciences, Kiel University, so_298_vmadcp_75khz_proc_report.pdf
Standard operating procedure:
Kopte, Robert; Betz, Maximilian; Anselm, Norbert (2022): SOP 75kHz ADCP aboard of RV Sonne (vessel:sonne:adcp_75khz_647271). Zenodo, https://doi.org/10.5281/zenodo.7525393
Project(s):
DAM Underway Research Data (DAM_Underway)
Coverage:
Median Latitude: -0.204390 * Median Longitude: -140.333826 * South-bound Latitude: -2.502300 * West-bound Longitude: 157.853300 * North-bound Latitude: 0.010300 * East-bound Longitude: -80.999600
Date/Time Start: 2023-04-15T11:43:00 * Date/Time End: 2023-05-26T22:33:00
Minimum DEPTH, water: 18.0 m * Maximum DEPTH, water: 810.0 m
Event(s):
SO298_0_Underway-1 * Latitude Start: -2.500200 * Longitude Start: -80.999900 * Latitude End: -1.353700 * Longitude End: 157.863300 * Date/Time Start: 2023-04-15T11:43:00 * Date/Time End: 2023-05-26T22:33:00 * Elevation: -104.2 m * O2A Registry URI: hdl:10013/sensor.8d073178-2ec8-4cbd-9548-e0cb29439d27 * Campaign: SO298 (GEOTRACES GP11) * Basis: Sonne_2 * Method/Device: Vessel mounted Acoustic Doppler Current Profiler [75 kHz] (VMADCP-75) * Comment: 38 kHz
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimeKopte, RobertGeocode
2LATITUDELatitudeKopte, RobertGeocode
3LONGITUDELongitudeKopte, RobertGeocode
4DEPTH, waterDepth watermKopte, RobertGeocode
5Current velocity, east-westCur vel Ucm/sKopte, RobertVessel mounted Acoustic Doppler Current Profiler [75 kHz] (VMADCP-75)
6Current velocity, north-southCur vel Vcm/sKopte, RobertVessel mounted Acoustic Doppler Current Profiler [75 kHz] (VMADCP-75)
7Quality flag, current velocityQF cur velKopte, RobertSeadatanet flag: Data quality control procedures according to SeaDataNet (2010)UV QC flag meanings= 0:unknown, 1:good_data, 2:probably_good_data, 3:potentially_correctable_bad_data, 4:bad_data, 5:not_used, 6:not_used, 7:nominal_value, 8:interpolated_value, 9:missing_value
8Echo intensity, relativeEcho int relctsKopte, RobertVessel mounted Acoustic Doppler Current Profiler [75 kHz] (VMADCP-75)
9Pings, averaged to a double ensemble valuePings per ens#Kopte, RobertVessel mounted Acoustic Doppler Current Profiler [75 kHz] (VMADCP-75)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 2 (ProcLevel2)
Size:
29616425 data points

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