37 
Cireculation Model 
vr 
Fundamental equations 
Numerical methode 
Model region 
Grid resolution 
Horizontal grid 
distance 
Lower limit 
of the layers 
Period of simulation 
Time step 
Forcing 
Qut put 
FP? 
" 
Primitive shallow 
water equations 
semi-implicit finite 
difference method 
Implicit: vertical 
nomentum exchange 
North 
Sag 
48° N - 59° 30' N 
WW 16°E 
3-dimensional 
10 lavyers 
circa 20 km 
10, 20, 30, 60, 100, 
150, 200, 250, 300, 
and 500 m 
Stationary climatolo- 
gical mean situation 
3 minutes 
Climatological 
annual mean of 
the wind and clima- 
tological mean den- 
sity in spring 
mean tidal period 
resolved in 60 time 
Steps 
EM“ 
NR. ZEN. _ WET. RER ÄMTERN EEE ln A A BE Üe 
Primitive shallow 
water equations 
gemi-implicit finite 
difference method 
implicit: vertical 
momentum exchange, 
gravitational waves 
Northwest European 
Shelf Seas 1nclu- 
ding the North Sea 
48° N — 64° N, 
15° W-14° © 
3-dimensional 
12 layers in summer 
7 layers in winter 
eirca 20 km 
10, 20, 30, 60, 100, 
150, 200, 250, 350, 
600, 1000, 3500 m in 
summer 
20, 40, 100, 300, 
600, 1000, 3500 m 
In winter 
January 1969 to 
December 1982 
40 minutes 
6-hourly values of 
air pressure and 
wind stress over the 
simulation period. 
Climatological mean 
density in summer 
cesp. winter 
daily mean values 
and variances of the 
currents over the 
simulation period of 
14 years.