Secchi depths measured during the MOSAiC expedition

• Main Authors: Katlein, Christian, Anhaus, Philipp, Matero, Ilkka, Nicolaus, Marcel
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Arctic Ocean; BEAST; DATE/TIME; Depth of Secchi Disk; Event label; MOSAiC; MOSAiC_ECO; MOSAiC20192020; MOSAiC expedition; Multidisciplinary drifting Observatory for the Study of Arctic Climate; ocean optics; Polarstern; PS122/2; PS122/2_18-89; PS122/2_20-101; PS122/2_20-23; PS122/2_21-36; PS122/2_22-107; PS122/2_23-116; PS122/2_24-97; PS122/2_25-44; PS122/3; PS122/3_32-11; PS122/3_32-78; PS122/3_35-95; PS122/3_36-125; PS122/3_36-24; PS122/3_37-108; PS122/3_38-50; PS122/3_38-91; PS122/3_39-20; PS122/3_39-77; PS122/4; PS122/4_44-191; PS122/4_44-206; PS122/4_45-149; PS122/4_45-61; PS122/4_46-177; PS122/4_46-37; PS122/4_47-135; PS122/4_47-31; PS122/5; PS122/5_61-200; PS122/5_62-103; Quality flag; Remotely operated sensor platform BEAST; Secchi disc; Arctic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.929535; https://doi.org/10.1594/PANGAEA.929535

This dataset contains Secchi-depth measurements conducted manually in association with ROV dives during the MOSAiC expedition. A 20 cm black and white Secchi disk was lowered through the ROV access hole and the depth noted at which it disappeared. Data quality of manual observations is indicated using a quality flag with values from 1 representing robust measurements to 3 indicating low data quality. The measurement rope had a length of 20 m, thus true Secchi-depth values larger than 20 m could not be measured (quality flag = 2). During the dark season, Secchi depth was determined using headlamps for illumination resulting in less robust readings (quality flag = 3). Measurements were conducted by various members of the ROV deployment team.