Time-series data of physical oceanography, ocean current velocities and bio-optical seawater properties were obtained from mooring HG-IV-SWIPS-2018 in the Fram Strait in July 2018 - August 2019 as part of the Helmholtz infrastructure program Frontiers in Arctic Marine Monitoring (FRAM) and the long-term monitoring program at AWI HAUSGARTEN. The mooring was deployed during RV POLARSTERN expedition PS114, and recovered during PS121. The attached archive contains raw data files of an integrated profiling SBE52plus system (nominal depth: 135m) and a single RCM11 current meter (nominal depth: 167m; sampling interval: 1h). Due to technical issues, the profiling winch only operated as intended for 1 month. Auxiliary information such as sensor calibration sheets, mooring diagrams and schedule files are also provided, if applicable.

The file HG-IV-SWIPS-2018.zip includes all available sensor raw data from mooring HG-IV-SWIPS-2018. 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 PS114 and PS121 onboard RV Polarstern. Many individuals have contributed to the conception of the research, the preparation of the instruments, the deployment and recoveries, as well as to the retrieval of the data, which we greatly acknowledge. We acknowledge funding from the Helmholtz infrastructure program "Frontiers in Arctic Marine Monitoring", and from the Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung.