77 
Concluding, one may say that there is still uncertainty 
in the values for the advective flux into the various 
sea areas ("boxes"). The estimates for the advective 
turn-over times of these boxes and the results from 
mathematical models show a wide range of values. For a 
number of boxes the agreement between estimates and 
computations is reasonable, for others there is still a 
great discrepancy, and this indicates where further 
assessment is necessary (especially boxes 3, 6 and 7). 
A complete box model is therefore not to apply before 
further testing with appropriate data. Apart from that, 
such a model should include adjoining areas of the North 
Sea. Especially the Baltic should be included, as water 
leaving the North Sea for the Baltic returns ultimately. 
The accompanying summary diagram with table show the 
general pattern as it was thought to be. But £the appeal 
of such a scheme should not distract from the necessity 
to consider carefully the background of the estimates 
given and the particularities of the various boxes,. 
For this reason for each box a review is given in the 
sections 13-18. The discussion of the conditions in the 
boxes 2 and 6 is included in the sections dealing with the 
inflow and outflow between North Sea and Atlantic Ocean/ 
Norwerian Sea (sections 7 and 8).