Time-series data of physical oceanography and ocean current velocities were obtained from mooring Y5-1 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 five Seabird SBE37 MicroCATs (nominal depths: 17m, 37m, 68m, 98m, 243m; sampling interval 10min/1h), nine Seabird SBE56 temperature loggers (nominal depths: 22m, 27m, 47m, 58m, 78m, 148m, 193m, 405m, 471m; sampling interval 30s), one upward-looking Teledyne RDI 300 kHz Workhorse ADCP (nominal depth: 47m; sampling interval 1h), one upward-looking Teledyne RDI 75 kHz Longranger ADCP (nominal depth: 293m; sampling interval 1h), and one RBRDuo wave16 recorder in 4Hz burst mode (nominal depth: 17m; sampling interval 30min). The mooring also included four sets of fouling plates and larvae samplers in collaboration with the Woods Hole Oceanographic Institution, as well as two Develogic Sono.Vault and SVHTI passive and active acoustic recorders (nominal depths: 301m, 303m; data archived elsewhere). Auxiliary information such as sensor calibration sheets, mooring diagrams, and schedule files are also provided, if applicable.

The file Y5-1.zip includes all available sensor raw data from mooring Y5-1. 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.