195
The Two Box Model
(a)
OVERTURNINGIOVERTURNING(F=O)
0.25 ................................................................................................ .
0.2 ......... .
x
:::>
..J
....... .. .
u.
.. ..
a: 0.15 .. .
w
.. .
~
J:
C/)
W
a: 0.1
u.
I
U.
0.05
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
O~--~--_ _ - L ____ ~ __ ~~ __ ~ ____ ~ __ ~ ____ - L ____ L -__ ~
5
10
15
20
25
30
35
40
45
50
P - PISTON VELOCiW
(b)
Figure 12: The two-box model: (a) configuration, and (b) results (contours are overturning magnitude normalized by its value without freshwater forcing (F=O); the shaded
region has no thermally direct steady state.