Devey, Colin W; Kopte, Robert (2020): ADCP current measurements (75 kHz) during Maria S. Merian cruise MSM88/1 [dataset]. GEOMAR - Helmholtz Centre for Ocean Research Kiel, PANGAEA, https://doi.org/10.1594/PANGAEA.919058
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Upper-ocean velocities along the cruise track of Maria S. Merian cruise MSM88/1 were continuously collected by a vessel-mounted Teledyne RD Instruments 75 kHz Ocean Surveyor ADCP. The transducer was located at 6 m below the water line. The instrument was operated in narrowband mode with 8 m bins and a blanking distance of 8 m, while 100 bins were recorded using a pulse of 1.45 seconds. 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 acquistion 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 ADCP data were processed using the Python-based DAM-ADCP software, adapted from the OSSI toolbox developed by GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel. The average interval was set to 60 seconds. Data post-processing included water track calibration of the misalignment angle (-47.1499° +/- 0.777°) and the amplitude (1.0106 +/- 0.0144) of the Ocean Surveyor signal. Velocity quality flagging is based on following threshold criteria: abs(UC) or abs(VC) > 2 m/s, rms(UC_z) or rms(VC_z) > 0.3.
Related to:
Devey, Colin W; Wölfl, Anne-Cathrin; Augustin, Nico; Besaw, Mary; Damaske, Daniel; Évora, Dario; Gray, Alexandra; Hübscher, Christian; Le Saout, Morgane; Lux, Thorsten; Schade, Martin; Sobolewski, Linda; Villinger, Heinrich (2020): Bathymetric Mapping Of The Seafloor - A German Contribution To Completing The Map By 2030, Cruise No. MSM88/1 + MSM88/2, November 28, 2019 - January 14, 2020, Mindelo (Cabo Verde) - Mindelo (Cabo Verde) - Bridgetown (Barbados). MARIA S. MERIAN-Berichte, Gutachterpanel Forschungsschiffe, MSM88, 24 pp, https://doi.org/10.2312/cr_msm88
Data processing report:
Kopte, Robert (2020): ADCP current measurements (75 kHz) during Maria S. Merian cruise MSM88/1- Data Processing Report. Institute of Geosciences, Kiel University, msm_88_1_vmadcp_75khz_01_proc_report.pdf
Standard operating procedure:
Kopte, Robert; Betz, Maximilian; Anselm, Norbert (2022): SOP 75kHz ADCP aboard of RV Maria S Merian ( vessel:maria_s_merian:adcp_75khz_2096). Zenodo, https://doi.org/10.5281/zenodo.7525284
Project(s):
DAM Underway Research Data (DAM_Underway)
Coverage:
Median Latitude: 15.052667 * Median Longitude: -37.028655 * South-bound Latitude: 14.179100 * West-bound Longitude: -47.850300 * North-bound Latitude: 16.033900 * East-bound Longitude: -28.200600
Date/Time Start: 2019-11-29T05:01:00 * Date/Time End: 2019-12-16T11:03:00
Minimum DEPTH, water: 21.5 m * Maximum DEPTH, water: 813.5 m
Event(s):
MSM88/1_0_Underway-3 * Latitude Start: 14.500630 * Longitude Start: -28.204930 * Latitude End: 14.179100 * Longitude End: -28.200600 * Date/Time Start: 2019-11-29T05:01:00 * Date/Time End: 2019-12-16T11:03:00 * Elevation Start: -5259.0 m * Elevation End: -5527.0 m * Campaign: MSM88/1 (GERMANMAPPING) * Basis: Maria S. Merian * Method/Device: Acoustic Doppler Current Profiler (ADCP)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Kopte, Robert | Geocode | ||
| 2 | LATITUDE | Latitude | Kopte, Robert | Geocode | ||
| 3 | LONGITUDE | Longitude | Kopte, Robert | Geocode | ||
| 4 | DEPTH, water | Depth water | m | Kopte, Robert | Geocode | |
| 5 | Current velocity, east-west | Cur vel U | cm/s | Kopte, Robert | Vessel mounted Acoustic Doppler Current Profiler, RDI Ocean Surveyor, 75 kHz | |
| 6 | Current velocity, north-south | Cur vel V | cm/s | Kopte, Robert | Vessel mounted Acoustic Doppler Current Profiler, RDI Ocean Surveyor, 75 kHz | |
| 7 | Quality flag, current velocity | QF cur vel | Kopte, Robert | Calculated | 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 | |
| 8 | Echo intensity, relative | Echo int rel | cts | Kopte, Robert | Vessel mounted Acoustic Doppler Current Profiler, RDI Ocean Surveyor, 75 kHz | |
| 9 | Pings, averaged to a double ensemble value | Pings per ens | # | Kopte, Robert | Vessel mounted Acoustic Doppler Current Profiler, RDI Ocean Surveyor, 75 kHz |
Change history:
2021-06-28T08:02:55 – Parameter name "Quality flag" was replaced with "Quality flag, current velocity"
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:
12340692 data points
Download Data
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