University of Bergen
Physical oceanography data from Seaglider missions in the Lofoten Basin, Norwegian Sea, January - November 2023.
Recommended citation:
Damerell, Gillian M.; Fer, Ilker; Brakstad, Ailin; Elliott, Fiona
(2024)
Physical oceanography data from Seaglider missions in the Lofoten Basin, Norwegian Sea, January - November 2023.
https://doi.org/10.21335/NMDC-440347600
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Abstract
As a part of the SWOT Adopt-A-Crossover (AdAC) Consortium project, physical oceanography data were collected from two Seaglider missions in the Lofoten Basin, Norwegian Sea, in the period between January and November 2023. Seaglider SG563 was deployed in January 2023 on the east side of the Lofoten Basin and proceded west, arriving in the vicinity of the Lofoten Vortex on 3 March. It completed approximately 200 dives in the vicinity of the Lofoten Vortex in the period between 3 March and 7 May, then proceeded north-east before being recovered in June 2023. Seaglider SG560 was deployed in May 2023 and recovered in November 2023, and spent the entire mission cycling in and out of the Lofoten Vortex. The glider work was supported by the Research Council of Norway, project number 295962, through the project “NorEMSO: The Norwegian node for the European Multidisciplinary Seafloor and water column Observatory”. The gliders were operated by the Norwegian national facility for ocean gliders, (NorGliders) at the Geophysical Institute, University of Bergen. One NetCDF file per glider mission is provided: sg563_LBE_2023.nc sg560_LBE_2023.nc Each glider mission also has a zip file containing the associated raw data files (.log and .eng, see Seaglider file formats manual for further details), the sg_calib_constants file, manufacturer calibration datasheets for each sensor, and the json files for the mission. SG563_Lofoten_Jan2023.zip SG560_Lofoten_May2023.zip Details on the data processing and the sensors are provided in the summary and comments of each NetCDF file. Quality-controlled, 1-m vertically interpolated observations of temperature, salinity, and dissolved oxygen in the entire water column are provided for each descent and ascent of the gliders. Additionally, depth-average horizontal current estimates between two surfacings of the gliders are included. For SG563 only, the dataset also includes observations of chlorophyll fluorescence and optical backscatter at two wavelengths (470 and 700 nm), though users should note that the quality control on the chlorophyll and backscatter data has consisted solely of the removal of obviously unphysical values. Data failing quality control tests are replaced by NaNs and remain as gaps in the profiles. We caution the users that salinity profiles from the unpumped conductivity sensor of the Seaglider can be noisy and the resulting density profiles may contain overturns. We leave further filtering, averaging, and smoothing of the data to the users’ discretion depending on their objectives.
Scientific keywords:
EARTH SCIENCE> OCEANS> OCEAN CHEMISTRY> OXYGEN
EARTH SCIENCE> OCEANS> OCEAN CIRCULATION> EDDIES
EARTH SCIENCE> OCEANS> OCEAN OPTICS> SCATTERING
EARTH SCIENCE> OCEANS> OCEAN TEMPERATURE> OCEAN TEMPERATURE PROFILES
EARTH SCIENCE> OCEANS> SALINITY/DENSITY> OCEAN SALINITY> OCEAN SALINITY PROFILES
EARTH SCIENCE> OCEANS> OCEAN OPTICS> CHLOROPHYLL
Key words:
Lofoten Basin, Lofoten Basin Eddy, Lofoten Vortex, ocean currents, ocean glider