In mid September 2002 strong and steady easterly winds enhanced an upwelling on the northern coast of the Iberian peninsula.
Mean wind field from QuikSCAT on 25th September 2002. Strong and steady winds blowing westward can be observed. These wind conditions occured for a few days enhancing an upwelling on the northern coast of the Iberian peninsula.
The surface chlorophyll concentration is enhanced on the upwelling area but appears to be lower than in the entrance of the English channel where a strong thermal gradient, reveals the intense vertical mixing due to the tide (visible on individual sea surface temperaturescenes as well as on the mean seasonal image).
Sea surface temperature on 26th September 2002 from NOAA-16 night pass. Upwelling filaments can be clearly observed north of Iberian peninsula.
The sea surface temperature situation can be compared to this mean surface temperature image calculated for the last decade of September from historical AVHRR data, also presented on Nausicaa.