Expedition SO268 was part of the JPI Oceans project MiningImpact to assess the environmental impacts of deep sea mining of polymetallic nodules in the Clarion Clipperton Zone (CCZ). A sediment plume monitoring operation was conducted as part of this expedition. This plume was created by a dredge on 11 April 2019 between 6:30 to 19:00 UTC. Monitoring of the baseline conditions, active plume and post-disturbance effects was achieved by a sensor array of optical and acoustical sensors on platforms spread out around the plume creation site. This dataset contains calibrated acoustical measurements of this plume array acquired by 7 acoustic profilers (AQD/ADCP).

Deployed during event SO268-2_ST105:300 kHz ADCP (NIOZ_HYA-02), 1200 kHz ADCP (NIOZ_HYA-01) mounted on platform NIOZ_PFM-01.Deployed during ROV event SO268-2_ST111-ROV16:AQD (NIOZ_HYA-03) mounted on platform NIOZ_PFM-02.AQD (NIOZ_HYA-04) mounted on platform NIOZ_PFM-03.AQD (NIOZ_HYA-06) mounted on platform NIOZ_PFM-05.AQD (NIOZ_HYA-07) mounted on platform NIOZ_PFM-06.Deployed during ROV event SO268-2_ST118-ROV17:AQD (NIOZ_HYA-05) mounted on platform NIOZ_PFM-04.