Time-series data of physical oceanography and ocean current velocities were obtained from mooring Y3-1 on the Yermak Plateau from July 2022 to June 2023 as part of the ATlantic WAter pathways to the ICE (ATWAICE) project. The mooring was deployed during RV POLARSTERN expedition PS131 (ATWAICE) and recovered during PS137 (ALOIS). The attached archive contains raw data files of four Seabird SBE37 MicroCATs (nominal depths: 40m, 70m, 103m, 250m, sampling interval 10min/1h), eight Seabird SBE56 temperature loggers (nominal depths: 50m, 60m, 80m, 153m, 203m, 400m, 501m, 753m, sampling interval 30s), and one upward-looking Teledyne RDI 75 kHz Longranger ADCP (nominal depth: 306m; sampling interval 1h). Auxiliary information such as sensor calibration sheets, mooring diagrams, and schedule files are also provided, if applicable. The mooring also originally included a 29 m long tube segment at the top, which was however lost due to material failure in early February 2023. All data from the instruments in the tube (three SBE37 MicroCATs, three SBE 56 temperature recorders, one RBR Duo wave recorder, one Wetlabs ECO Triplet fluorometer, and one Nortek S500 ADCP) were therefore also lost. As another consequence, part of the remaining instruments beneath the lost tube were dislocated from their nominal depths due to the now missing buoyancy at the top of the mooring.

The file Y3-1.zip includes all available sensor raw data from mooring Y3-1. The structure of the unzipped folders is mooring->sensor/sampler type->serial number->instrument files. All instruments were synched to UTC before deployment, and the offset after the recovery is supplied in the respective instrument folder, if available. The archive also contains the sensor calibration sheets/files and relevant sampler schedule files, if available. Finally, mooring schematics are also attached as pdfs in the root folder.The authors are grateful to the captains, crews, and technical/scientific staff of the expeditions PS131 and PS137 onboard RV Polarstern. Many individuals have contributed to the conception of the research, the preparation of the instruments, the deployments and recoveries, as well as to the retrieval of the data, which we greatly appreciate. We acknowledge support from the Helmholtz infrastructure program "Frontiers in Arctic Marine Monitoring", and the Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung. This mooring contributed to the Arctic PASSION project.