CHAPTER 1 • The Carbonate System in Marine Environments
19
Table 1.3. Changes in the CO2 system due to the oxidation of plant material (Millero 1997)
Initial (mM)
I!.AOU(mM)
0.13
0.26
,.,.C0 2
0
0.10
0.20
TC0 2
2.200
2.300
2.400
CA
2.487
2.487
2.487
Pco,
350
610
1160
pH
8.200
8.001
7.753
[CO 2 ]
0.012
0.021
0.040
[HCO~]
1.889
2.072
2.234
[CO;-]
0.299
0.208
0.126
250
-. reo]
200
--CA
-l::r- pH
150
-0-- PC0 2
t . . 100
1:71
I:
'"
.&.
U
SO
0
- 50
0.00
0.04
0.08
0.12
0.16
0.20
0.24
0.28
6AOU(mM)
Fig. 1.6. Changes in parameters of the carbonate system due to oxidation of plant material (Millero 1996)
This equation has been used by Chen (1978) to predict changes in Ca 2 + as a function of depth in the Pacific that agree very well with the measured values. The changes
in inorganic carbon to organic carbon are given by
Inorg C / Org C = x / 106y = 16 ~Ca / 106 ~N03
= (8 TA + 8.5 ~N03) / 106 ~N03
(1.28)