KLIWAS 
Seite 23 
SST - Front Zone Magnitude 
AVHRR 
mean 1990-2011 
1 1 NOV 
Fig. 13: Mean of gradient magnitude for frontal zone based on the data of the AVHRR sensor on 
NOAA and METOP 1990 - 2011 and for months 
KLIWAS 
Climatology 
of North Sea 
Fronts