261
The Carbonate System
CO
2 Inputs (ppm yr
–1
)
–20
–10
0
10
20
60
40
20
Equator
20
40
60
Industrial
Sources
Natural
Sources
North
Pole
South
Pole
Figure 7.3
Anthropogenic inputs of carbon dioxide as a function of latitude.
Stocks as Gt C
Flows as Gt C yr
–1
Fossil Fuel
Atmosphere
747
Weathering
5.3
Forestry
54.3
0.3 0.3
80
Land
639
River
Surface
Ocean
DIC 1000
DIC 0.45
DOC ??
Pycnocline
32
Plankton
5–27
Deep Waters
DIC 36700
POC 7–9
POC 4.7
PIC 0.75
DOC 1198
PIC 0.15
POC 0.04
Sediments
POC 6000000
PIC 14000000
Soil
1625
Figure 7.4
The global carbon cycle. DIC = dissolved inorganic carbon; PIC = particulate inorganic carbon.