75 
also lead to different mean values. 
This example should make clear that a pollution monitoring that is 
not fitted to the natural fluctuations of the system can lead to 
different results and ratings of the quality status of the North 
Sea. 
In view of the atmospherically induced fluctuations of the ecologi- 
cal system of the North Sea, which up to the seasonal cycle showed 
no strictly forecastable regularities (as also the weather for long- 
er time scales), the existing monitoring strategies should be re- 
flected upon and examined to see 1f they are sultable for 
monitoring trends 
recognizing dangerous short concentration increases, which could 
possibly damage the environment, and 
delivering data for assessment calculations. 
It appears to be especially advisable, in some cases, to supple- 
ment the higher spatial scanning by @& better temporal resolution of 
the observations, This can take place by means of fixed permanent 
stations for parameters - which can be automatically measured, and 
by fixed "sections", which can be operated more frequently and for a 
longer period of time. 
Insofar as pollutants wust be monitored which are introduced into 
the North Sea via the rivers, the Figs. 9 and 10 can provide an 
indication as to where permanent stations resp. "sections" can be 
placed for an optimum monitoring. 
5 
Summary of the unanimous statements of the model results 
In total, the distribution of the pollutants in the North Sea in- 
dicates an asymmetrical structure. The highest mean loads and the 
highest fluctuations occur in the Inner German Bight. 
Pollutants which occur in the region off the mouth of the Rhine, 
reach the inner Germin Bight only to a small extent, however," bur- 
den the Danish coast, 
Pollutants which were introduced on the East coast of Great Bri- 
tain, in general do not reach the inner German Bight; they conta- 
minate the central North Sea and the Dogger Bank region which is 
of particular significance for the fishing industry. 
The pollution of the inner German Bight can be traced back to the 
river inputs, predominantly from Elbe and Weser and other local 
SOurces. 
Ihe West coast of Jutland is severely burdened, although no essen- 
tial inputs/introductions were undertaken there.