PANGAEA_993684 Shipboard ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM140/2 Kopte, Robert; Oelker, Julia Shipboard ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM140/2 2026-04-22 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.993684 Investigator Robert Kopte robert.kopte@ifg.uni-kiel.de Earth Science DATE/TIME LATITUDE LONGITUDE DEPTH, water Current velocity, east-west Current velocity, north-south Quality flag, current velocity Echo intensity Echo intensity, cleaned Backscatter, relative Pings, averaged to a double ensemble value Percent good pings geoscientificInformation MSM140/2 MSM140/2_0_Underway-11 Vessel mounted Acoustic Doppler Current Profiler [75 kHz] Vessel mounted Acoustic Doppler Current Profiler [75 kHz] Seadatanet flag: Data quality control procedures according to SeaDataNet (2010) Maria S. Merian 2025-10-24 2025-11-02 Complete -17.0276 22.4115 -33.88819999999998 -26.50260000000003 22.0 m (DEPTH, water) 814.0 m (DEPTH, water) DAM_Underway DAM Underway Research Data DataHub DataHub Earth and Environment of the Helmholtz Association unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 4609820 data points text/tab-separated-values Kopte, Robert; Oelker, Julia (2026): Shipboard ADCP current measurements (38 kHz) during RV MARIA S. MERIAN cruise MSM140/2 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.993783 Oelker, Julia; Bergmann, Josy; Frederick, Jennica; Hayo, Lennéa; Kinne, Stefan; Reischmann, Lucas; Stammes, Piet; Tuinder, Olaf; Wang, Ping; Windmiller, Julia; Ziegler, Steffen (2026): Collecting Atmospheric Reference Data DowN in latitude leg, Cruise No. MSM140/2, 17.10.2025 - 05.11.2025, Brest (France) - Rio de Janeiro (Brazil). MSM140/2, 45 pp, https://doi.org/10.48433/cr_msm140_2 nc file: ADCP current measurements (75 kHz) during RV MARIA S. MERIAN cruise MSM140_2 (2026). https://download.pangaea.de/reference/139546/attachments/msm_140_2_vmadcp_75khz.nc Kopte, Robert (2026): Upper-ocean acoustic Doppler current profiler (75kHz-ADCP) underway measurements during MARIA S. MERIAN cruise MSM140_2. Institute of Geosciences, Kiel University, https://download.pangaea.de/reference/139545/attachments/msm_140_2_vmadcp_75khz_proc_report.pdf Anselm, Norbert; Kopte, Robert (2024): SOP 75kHz ADCP aboard of RV Maria S. Merian (vessel:maria_s_merian:adcp_75khz_671911). Zenodo, https://doi.org/10.5281/zenodo.14532654

Current velocities of the upper water column along the cruise track of R/V Maria S. Merian cruise MSM140/2 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 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 2.2.0) was used for data post-processing. 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. Upper-bin single-ping ADCP velocities affected by low echo-intensity were identified using a robust covariance-based outlier detection in velocity-backscatter space and removed when exceeding a chi-square confidence threshold. 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 (-47.1070° +/- 0.4765°) and scale factor (1.0049 +/- 0.0077) of the measured velocities. The velocity data were averaged in time using an average interval of 60 s. Depth cells with ensemble-averaged percent-good values below 25% are marked as 'bad data'. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.993684"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME https://doi.org/10.48433/cr_msm140_2 Collecting Atmospheric Reference Data DowN in latitude leg, Cruise No. MSM140/2, 17.10.2025 - 05.11.2025, Brest (France) - Rio de Janeiro (Brazil) https://doi.org/10.5281/zenodo.14532654 SOP 75kHz ADCP aboard of RV Maria S. Merian (vessel:maria_s_merian:adcp_75khz_671911) https://doi.pangaea.de/10.1594/PANGAEA.993783 Shipboard ADCP current measurements (38 kHz) during RV MARIA S. MERIAN cruise MSM140/2 https://en.wikipedia.org/wiki/RV_Maria_S._Merian Maria S. Merian https://helmholtz.software/projects/datahub DataHub https://www.allianz-meeresforschung.de/kernbereiche/datenmanagement-und-digitalisierung#unterwegs DAM_Underway https://www.seadatanet.org/content/download/596/file/SeaDataNet_QC_procedures_V2_%28May_2010%29.pdf Seadatanet flag: Data quality control procedures according to SeaDataNet (2010) DIF 9.4 2026-04-22 2026-04-29