| Summary: | Inherent optical data collected in Storfjorden (Svalbard) in June 2020 onboard the coast guard vessel KV Svalbard during the Useful Arctic Knowledge project summer school. This data was collected as part of the Nansen Legacy project. Optical data collected includes in situ measurements of absorption and attenuation, accompanied by in situ profiles of salinity, temperature, pressure (CTD) and dissolved organic matter fluorescence (3-channel fluorometer). Water samples were collected for measurements of dissolved (colored dissolved organic matter, CDOM) absorption, and material was collected on filters for determination of particulate absorption by phytoplankton and non-algal particles, and the stable oxygen isotopic composition of seawater. The data is available in netcdf files or individual CSV files. Absorption_Cruise_UAK2020.nc: contains the measurements of CDOM and particulate absorption from water samples. In_Situ_Absorption_Attenution_Cruise_UAK2020: contains the in situ measurements of spectral absorption and attenuation The CSV files in this collection include the spectral measurements of optical properties as follows: icam_aphy.csv: Phytoplankton absorption coefficient (in 1/m) as measured with the QFT-ICAM technique icam_anap.csv: Non-algal particle absorption coefficient (in 1/m) as measured with the QFT-ICAM technique Perkin_ap.csv: Total particle absorption coefficient (1/m) as measured with the QFT_Perkin technique CDOM.csv: Coloured Dissolved Organic Matter (CDOM) absorption coefficient (1/m) and data on: O18.csv: Oxygen isotope ratio (δ18O, in ‰ against VSMOW) acs_fdom_ctd: High vertical resolution in situ cast data: total non-water absorption (1/m) and attenuation (1/m), Fluorescence by Dissolved Organic Matter (FDOM, raw digital signal counts), water salinity (practical salinity scale) and temperature (degrees Celsius). FDOM was measured at three excitation/emission pairs as follows: Channel 1 (Ch1, 310/450 nm) that represents marine ultraviolet humic-like and marine humic-like material; for Channel 2 (Ch2, 280/450 nm) represents terrestrial humic-like material; and for Channel 3 (Ch3, 280/350 nm) represents protein-like tryptophane type material.
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