280
Chemical Oceanography, 4th Edition
If one combines the AOU and CaCO 3 effects, one finds
(CH 2 O) 106 (NH 3 ) 16 H 3 PO 4 + 138O 2 + 124CO 3
2– → 16NO 3
–
+ HPO 4
2– + 230HCO 3
– + 16H 2 O
(7.116)
The CO 3
2– ions formed from the dissolution of CaCO 3 react with the protons formed
from the oxidation of plant material. If x μM of CaCO 3 and y μM of organics are decomposed, the changes in TA, TCO 2 , and NO 3
– are given by
ΔTA = 2 x – 17y
(7.117)
ΔTCO 2 = x + 106y
(7.118)
ΔNO 3 = 16y
(7.119)
Table 7.7
Changes in the CO 2 System Caused by the Oxidation
of Plant Material
Initial a
ΔAOU (mM)
% Change
0.13
0.26
ΔCO 2
0
0.10
0.20
—
TCO 2
2.200
2.300
2.400
9.1 ± 0.1
A C
2.487
2.487
2.487
0
pCO 2
350
610
1.160
231 ± 1.0
pH
8.200
8.001
7.753
–5.5 ± 0.04
[CO 2 ]
0.012
0.021
0.040
233
[HCO 3
– ]
1.889
2.072
2.234
18
[CO 3
2– ]
0.299
0.208
0.126
–58
a All concentrations are millimolar.
Table 7.8
Changes in the CO 2 System Caused by the Dissolution
of CaCO 3
Initial a
ΔCaCO 3 (mM)
% Change
0.05
0.10
ΔCO 2
0
0.05
0.10
—
TCO 2
2.200
2.250
2.300
4.5 ± 0.1
CA
2.487
2.587
2.687
72 ± 0.05
pCO 2
350
310
290
–17 ± 1.0
pH
8.200
8.264
8.321
1.5 ± 0.04
[CO 2 ]
0.012
0.011
0.010
–17
[HCO 3
– ]
1.889
1.892
1.844
0.3
[CO 3
2– ]
0.299
0.348
0.397
33
a All concentrations are millimolar.