Hydrography and carbon from Station M (OWSM) 2022-2023

The dataset contains data from a single array mooring covering the depths between 500 m and 2000 m (bottom) at Station M (OWSM) in the Norwegian Seas. The mooring was deployed in November 2022 and retrieved in August 2023. Measurements frequency is 1/1 hr for the hydrography, 1/1 min for the temperature sensor at 1500 m and 1/12 hr for the carbon measurements. At 800 m and 1200 m nominal depth, the pressure has been calculated based on distance between the SBE sensors. Ship CTD was used to correct the SBE-37 sensors at mooring. The ship CTD salinity is corrected by comparing with bottle salinity from the deepest depth. The salinity correction is linear, i.e., use the same correction all over the water depth. The salinity correction vary from station to station at a cruise, but an average offset is used for the whole cruise. The CO2 data was collected using a HydroC-CO2 sensor. The CO2 sensor measures xCO2 and pCO2 at 100% humidity. The sensor is pre- and post calibrated at 4HJena (Germany). fCO2 [uatm] is calculated according to Pierrot et al. (2009). The fCO2 data from HydroC CO2 sensor was adjusted to calculated fCO2 from discrete samples of Dissolved Inorganic Carbon (DIC) and Total Alkalinity (TA). The sensor fCO2 data was adjusted by subtracting 55.7 uatm. This number was achieved by using discrete samples from 500 dbar collected on 2022-11-25 and 2023-01-18, and constants from Lueker et al. (2000), Dickson (1990), Lee (2010), and Dickson&Riley (1979). QC flags from EuroSITES are used for all data, where flag 0 is used for raw data (unknown, no QC was performed) and flag 2-4 are used for data that have been QC-ed. Flag 1 is good data, flag 2 is probably good data, flag 3 is potentially correctable bad data, and flag 4 is bad data. This dataset is part of the NorEMSO project (RCN:295962) and EMSO-ERIC.