GLOBAL05 V1.0 configuration

The analysis is performed on anomalies relative to a monthly climatology  (Levitus 98 and Medatlas) and we consider these anomalies centered.  

For each level, the field and the error associated are calculated on a grid with 1/2 of degree resolution. The structure functions (X,Y and t) are modeled by Gaussian functions. Two correlation scales are taken into account: the « long scale » (LS) and the « meso scale » (MS).  

Combining the variability of this scales and the data distribution, we have defined 199 areas; a  MS  value is associated to each area. The MS is fixed to about 4 Rossby radius mean for each area and the LS is fixed to 300 km according to the ARGO scales.

 The figure below shows the MS values. Two examples of the spatial correlation function and the time correltion function are shown on the figures:  a, b and c.

One MS value is fixed for each area.

2 examples of spatial correlation fonction with  respectively MS=20 km et MS=250 km and below: the time correlation function. The analysis uses the black curve (sum of : 2*MS+LS).

In order to not take into account measurements from different basins, somes areas are associated to a mask, for example the area "154" for which the Mediterranean sea is masked and the area "195" for which the Alantic is masked  (all figures in the document: cordo-zzz-05-054.pdf).

Every Wednesdays, 4 analysis with the estimation days d, d-7,d-14, d-28 are produced. Each analysis takes into account the profiles measured within  -21/+21 days arround the estimation date interval.