Source: \SG563_UFO_Norwegian_Sea_2024_2025.nc Format: netcdf4 Global Attributes: title = "Physical oceanography data from the UFO Seaglider mission in the southern Norwegian Basin, August 2024 – May 2025" author = 'Lid, Daniel; Brakstad, Ailin; Fer, Ilker' history = 'Version 1' summary = "This dataset contains Seaglider observations from the southern Norwegian Basin in the Norwegian Sea, northwest of the Faroe Islands. This mission was part of the Upstream pathways of the Faroe Overflow (UFO) project. The goal of this mission was to capture mesoscale variability and the upper part of the Norwegian Sea Gyre Rim. The dataset includes 1-m depth-binned profiles of temperature and salinity, as well as depth-averaged current (DAC) for each dive. Seaglider SG563 was deployed by R/V Neil Armstrong on 23 August 2024 and recovered by Jákup Sverri on 15 May 2025. During the main part of the mission, from August to March, the glider repeated a 70 km long transect across the Norwegian Sea Gyre Rim for 33 times. The glider performed 980 dives and sampled 1840 profiles. A dive is the trajectory of the glider between two subsequent surfacing and contains the timeseries records during the descent and ascent (climb) profiling phases as well as the surface and deep maneuvers between them. The glider operated between the surface and 1000 m depth, sampling profiles on both descents and climbs at a typical rate of 10-15 s (see comments). The vertical velocity was typically 10 cm/s. The data set was processed using the Seaglider Basestation3 (v3.0.8) software, including a hydrodynamic flight model regression, correction for the thermal lag of the conductivity cell, and quality control (see comments). Because of the unpumped CT sensor, the salinity data must be used with caution. Salinity and temperature measurements were calibrated with data from a CTD station from the recovery cruise, by applying a constant salinity offset of 0.02. The dataset provided here is a gridded netCDF file that contains the mission data vertically binned at regular 1-m intervals. The profiles are not vertically interpolated. In addition to this dataset, two different data products are provided: 1) Individual netCDF files per trajectory, and 2) a single netCDF file that contains the entire mission data in a time series. These files are direct outputs from the Basestation3 software, including raw and quality-controlled data, with associated quality control flags. The depth-binned data provided here has gone through additional despiking and manual quality control (see comments). In the gridded file, only a selection of variables is provided for the end-user, and all flagged data, either detected automatically or manually, are replaced by NaNs. Processed practical salinity, temperature and depth-averaged current from Seagliders are nominally accurate to 0.01, 0.001K and 0.01 m/s, respectively." comment = "The Seaglider SG563 (WMO ID 6801613) was equipped with a Kistler pressure sensor and an unpumped SBE CT sail (SN 0263). The CT sail was last calibrated on 21 Jan 2018. The mission contains 980 dives. Science sampling was turned off during dives 731-768, 946-952 and 957-970. The salinity was all bad for dive 547. These dives were not included in the gridded data file, which includes in total 1840 profiles. During dives 773-825, 856-945, 953-956 and 971-980 the glider only sampled during descent. Compass calibration dives were done twice, using data from dives 19-20 and dives 39-40. The final compass coefficients were updated on dive 49. The glider sampled salinity and temperature every 10 seconds in the upper 300 m, and every 15 seconds between 300 and 500 m. Below 500 m the sampling interval was initially set to 60 seconds until dive 18, 30 seconds until dive 71, and to 15 seconds thereafter. After dive 596 on 15 Jan 2025, the sampling was reduced to 20 seconds intervals below 500 m in an effort to save battery. The data was reprocessed using the python based Seaglider Basestation3 software (version 3.0.8, https://github.com/iop-apl-uw/basestation3/) developed and maintained by the Integrative Observational Platforms (IOP) group at the University of Washington’s Applied Physics Laboratory (APL-UW). The flight model regression continuously evaluates the volume and hydrodynamic model parameters of the glider as described in Bennet et al. (2019): https://github.com/iop-apl-uw/basestation3/blob/master/docs/FlightModel.pdf. Details on the thermal lag correction of the conductivity cell and the quality control included in the Basestation3 software are provided here: https://github.com/iop-apl-uw/basestation3/blob/master/docs/Seaglider_Quality_Control_Manual.html. The reprocessing routine first removes data outside of globally set bounds (-2degC>