Data

The analyzed fields of temperature and salinityt are constructed with the vertical profiles collected and controled by the CORIOLIS data center. These profiles are irregularly spaced (in time and space). They are also be measured by different instruments, profiling float from the Argo program, CTD, or XBT for instance, with different accuracy.  The vertical reference (pressure depth) and the vertical resolution can also be different.  Moreover, the transmission  mode or the software also impose a resolution.

The T & S fields are constructed on horizontal level (depth):59 levels from 0 down to 2000 m.

A pre-processinf step has been developed: the main stages of this "standardization" are :

	seection of measurements with QC 1or 2,
	homogeneization of vertical reference (Z),
	interpolation of profiles on a vertical standard grid,
	new indicators on the quality of the vertical interpolation are created,
	errors are associated to each interpolated measurement,
	to avoid over-sampling, profiles from buoys  (for the same instrument) within 24 h, 24 km intervals are averaged.

The standard vertical grid (version V3.03) has 250 levels: 0:5:400 / 410:10:2000 / 2020:20:2180

PROVOR float: example of a raw (on the left) and a standardized (on the rigth) salinity profile. The values of the quality indicators (qc) are 1.

TRITON mooring: example of a raw (on the left) and a standardized (on the rigth) temperature profile. The values of the quality indicators (qc) are 1, 2, 3 or 4.

Example of averaged profiles measured by a driftinf buoy.Black: profiles measured by the buoy within Δtmax (24 hours) and Δdmax (24 km), blue: averaged profile.