KLIWAS 
Seite 
-23- 
The yearly standard deviations of the RCM show a higher variability than ERA-40 
for the whole area (Fig. 3.8.7 and 3.8.8). While in summer the variability is higher 
than that of ERA-40, during winter it is lower. (Fig. 3.8.10; Fig. 3.8.12). 
The annual precipitation cycles of all investigated models are shown in Fig. 3.8.13. 
Apparently, the annual cycle is more pronounced in ERA-40 than in the RCMs (more 
precipitation in winter time and less precipitation during summer (Kjellstrom et al., 
2011). 
Comparing 
meteorological 
fields of the 
Ensembles 
regional climate 
models with ERA- 
40-data over the 
North Sea