KLIWAS

Seite  20

KLIWAS
Climatology
of  North  Sea
Fronts

4.2  StatisticalRontProduct

4.2.1  North  Sea  Blank
After  the  algorithm  has  been  validated  and  tested  the  EO  data  listed  in  Table  1  have
been  processed.  All  input  data  are  collocated  on  a  spatial  grid  that  covers  the  North
Sea  and  part  of  the  North  East  Atlantic.  After  computation  of  the  gradient  magnitude
and  gradient  direction,  a  set  of  statistical  measures  was  computed  for  SST  and  OC
front  products.  All  input  data  with  the  exception  of  the  AVHRR  data  are  collocated
on  a  predefined  subset  with  the  following  properties:

•  horizontal:
•  vertical:
•  size:
•  scale:
•  projection:

0  -  1273  pixel;
0  -  1337  pixel;
1273  x  1337  =  1702001;
1  km/  pixel;
UTM  Zone  31  WGS1984.

The  AVHRR  data  was  delivered  on  other  subset  with  the  following  properties:
horizontal  1100  pixel;  vertical  1000  pixel;  size  1100000  pixel;  scale  ~1  km/pixel;
projection  Mercator.  To  facilitate  comparison  the  results  of  the  temporal  statistics  for
the  AVHRR  sensor  have  been  collocated  on  our  predefined  subset.

4.2.2  Predefined  Bands  in  Statistical  FYont  Products  -  SST&  OC

The  ocean  bathymetry  created  by  NOAA's  National  Geophysical  Data  Center
(NGDC)  is  available  as  static  information  layer  (Amante  and  Eakins,  2009).
Furthermore,  a  static  land/water  mask  has  been  applied  to  all  input  products  which
was  derived  from  the  bathymetry  data  set.