The South Atlantic Carbon Isotope Record of Planktic Foraminifera
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GEOSECS , ATLANTIC
-1000
I
·2000
I
-3000
.J
I"' " { 20
a..
w
0 -4000
~
·5000
·6000 - .... -
-60 ·50 -40 -30 -20 ·10 0
10 20 30 40 50 60 70
·1000
0.8
o.a
0.&
-
C
E
-2000 ~-? 2
'>~
o.a
I
·3000 ~: [i f O.
8
NADW
Ia..
W
~
0 · 4000
·5000
·6000
-60 ·50 -40 ·30 ·20 ·10 0
10 20 30 40 50 60 70
0
·1000
E ·2000
2.2 -
I
·3000
Ia..
w
0 ·4000
·sooo
·6000 ,
-60 -50 -40 -30 -20 -10 0
10 20 30 40 50 60 70
LATIT UDE
Fig. 1. (a) GEOSECS nitrate concentrations; (b) GEOSECS carbon isotope composition of dissolved CO,;
(c) B" C corrected for nutrient components.