KLIWAS 
Seite 18 
KLIWAS 
Climatology 
of North Sea 
Fronts 
4 De sc rip tio n o f inp ut a nd o utp ut p id d uc ts 
For the North Sea climatology it was necessary to process very large data volumes. 
The proper processing of the EO data archive was done for SST and OC parameter 
with different sensor data which are summarized in see Table 1. 
Table 1: Data sets included into the climatology 
Parameter 
Sensor 
Satellite 
Time Period 
Units 
Sea Surface Temperature 
AATSR 
ENVISAT 
2002-2011 
K 
Sea Surface Temperature 
MODIS 
AQUA 
2003-2011 
K 
Sea Surface Temperature 
AVHRR 
NO A A & MetOp 
1990 -2011 
K 
Chlorophyll 
MERIS 
ENVISAT 
2002 - 2010 
mg/m 3 
Total Suspended Matter 
MERIS 
ENVISAT 
2002 - 2010 
g/m 3 
Yellow Substance Absorption 
MERIS 
ENVISAT 
2002 - 2010 
1/m 
Turbidity 
MERIS 
ENVISAT 
2002 - 2010 
1/m 
4.1 SSTand Ocean Colour Input Data 
Input data for the front detection algorithms are pre-processed data, i.e. they are geo- 
corrected and cloud mask, land mask and possible "NaN" masks are applied. The 
cloud mask is an integral part of standard level 2 products, but the quality varies 
between the different sensors. Therefore additional algorithms are used to improve 
the cloud detection. 
AATSR SST: 
The AATSR Level 2 Gridded Sea Surface Temperature (GSST) product is a full 
spatial resolution (approximately 1km by 1km) product. Pixel information is formed 
by a mixture of geophysical product, surface brightness temperature/radiance and 
TOA 3 brightness temperature/radiance in the case of an unclassified pixel (Scarpino 
et al. 2009, RAL, 2007)). 
3 Top of Atmosphere