30
Chemical Oceanography, 4th Edition
1.4.4 indian Ocean
The surface currents in the Indian Ocean are shown in Figure  1.38. The Indian differs
from the Atlantic and Pacific in its limited northern extent because of the Asian land
mass. The subtropical convergence at 40° S is considered to be the southern boundary of
the Indian Ocean. In the South Indian Ocean, the counterclockwise gyre is similar to the
South Atlantic and Pacific Oceans. It is bound on the south by the Polar Current. Part of
20
34
35
100 m
100 m
Pac. Equat.
1000 m
1000 m
600 m
600
(b)
(a)
3000 m
3000 m
28
27
27
28
σ t = 26
σ t = 26
300 –
800 m
N. Pac.
Inter.
P a c . E q a t .
E . S . P a c . C e n t r a l
W .S . P a c . C e n t r a l
N . P a c . C e n t r a l
Salinity
36
10
Temperature °C
0
20
34
35
Salinity
36
10
Temperature °C
0
Pa c. Su b- An t.
S u b . A n t .
A n t. In te r.
Figure 1.37
The T- S diagram for the (a) North and (b) South Pacific Ocean.