280
120
120
B
125
125
130
130
135
[mm]
135
[mm]
15
30
140
10
140
20
145
5
145
10
---,
>.
0
0
--'
Q) 150
150
E
:;:;
-5
-10
155
- 10
155
-20
160
-15
160
-30
165
165
170
170
175
175
140E 180 140W
140E 180 140W
Longitude
Longitude
Figure 7: Hovmoeller diagrams of sea level anomalies (mm) averaged over the region
20° N - 30° N (left) and 35° N - 45° N (right) for a forcing period of 20 years. Rigdes
(troughs) of the wind stress anomaly are indicated by solid (dashed) horizontal lines.
equation for the streamfunction ' l/J:
f2
1
('l/Jxx + ' l/Jyy - -;} . 'l/J)t + {3. ' l/Jx = - H . \7 x I.. + v . 'l/Jxxxx
(1)
Subscripts denote partial derivatives. Some friction is added in (1) for
numerical reasons. The special form of the friction is chosen to account
for the existence of western boundary currents. Boundary conditions are
'l/J=const.=O along boundaries. The parameters f = 2w sin , {3, c, H, and