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Abstract:
These velocity and salinity data have been collected by moorings of the Fram Strait Arctic Outflow Observatory (FSAOO) at 78°50’N (F17 at 8°W, F14 at 6.5°W, F13b at 5.5°W, F13 at 5°W, F12 at 4°W, F11 at 3°W, F10 at 2°W) between Sept. 2003-Aug. 2019. The moorings have been maintained by the Norwegian Polar Institute (between 2003-2016, F10 was maintained by the Alfred Wegener Institute). The time-series of freshwater transport, freshwater content, volume transport and salt transport are calculated from the gridded salinity and velocity fields and are integrated over the full section as well as in the Polar Water (PW) (sigma<27.7 & T<0). Freshwater is calculated relative to a reference salinity of 34.9.
Quality
The raw data collected from the moored instruments received standard post processing and quality control. Velocity data are corrected for magnetic deviation and tides are removed with a 41-hr low-pass filter. The salinity is based on mooring data combined with a seasonally varying hydrographic data set to improve the stratification and corrected for any density instabilities. Data are then monthly averaged. Data gaps are treated with regression with neighbouring instruments or filled in with long-term mean values. Data are interpolated on a grid with bottom following contours below 150 m and horiontal z-levels with 10 m resolution above. Horizontal resolution is 0.25 degrees longitude. Interpolation for velocity is linear while salinity is interpolated cubically in the vertical. The data have been corrected (back in time) for the effect of increasing coverage of the mooring array.