Surface Marine Data and QC plots 
Observation and model data for the past 15 days are available and updated every day around 10:00 UTC.
The atmospheric model fields are interpolated in two ways at the station location. First, a spatial co-location is carried out between nearest grid points for both nearest base times. Then a linear temporel interpolation is performed between these two values. For some parameters (e.g. SST and waves), the sea/land mask is taken into account for the spatial interpolation, in order to avoid certain errors due to the discontinuity of such fields.
Besides, temperature and salinity data are compared with fields provided by the ocean forecasting system Mercator. Both analyses and forecasts are used, with an update each thursday. Only a spatial co-location is performed there, since the ocean fields are daily averaged.
Most of the comparison elements are biases (i.e. differences). However, for some of them, the ratio (obs/model) was chosen instead. This is the case for wind speed, relative humidity, wave height and wave period.
Wave comparisons must be interpreted with care. ECMWF wave model data actually deal with the total sea (swell + wind generated waves), whereas the observed wave data are either total sea (buoy messages) or the most powerful wave system (swell or wind waves reported in ship messages).
Wind strength data comparisons must also be looked at with some caution, since the height of the anemometer is not necessarily the model level (10 m).
This is why one can also find a parameter called "Wind Speed (correction)", which takes into account the heigth of the ship's anemometer (when known), to apply a correction to the observed wind strength through a logarithmic law (using a sea surface roughness length of 0.001 m).
The delay is the time between the date of the observation and its insertion into the Meteo-France database.