Data Processing:

The data includes processed tracks from 45 RAFOS float trajectories collected for 'The Pathways to the Denmark Strait Overflow: A Lagrangian Study in the Iceland Sea' project collected between 24-Jul-2013 and 29-May-2015.

The floats were tracked in Matlab using the ARTOA3 software package (https://www.whoi.edu/instrument/rafos/artoa-float-tracking). Erroneous spikes in the temperature and pressure data were removed. Time drifts in the sound sources were calculated and applied. Before starting to track the data, trasmission time differences in the Times Of Arrival (TOAs) were corrected and interpolated using a variable width (usually 10-day) cubic spline filter. A least-squares method was used for tracking if more than two TOAs were available. Sound velocity was estimated using the Del Grosso equation. 

The final data variables are: time, latitude, longittude, pressure, temperature, u-velocity, v-velocity and the following flag values:

0 = no TOA times series used in tracked point was interpolated
1 = one TOA point out of two to five points was interpolated
2 = two TOA points used in the least squares alogorithim were interpolated
3 = three TOA points used in the least squares alogorithim were interpolated
4 = four TOA points used in the least squares alogorithim were interpolated
5 = five TOA points used in the least squares alogorithim were interpolated

(created 19-Sept-2019, ALR, WHOI)