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TABLE 1
Trial Balance: Annual Carbon sinks Gt/C/yr. Measured or measured/estimated
data only, entries in Gt 1 Gt = 1 x 109 t
Partition min max median or
(uptake) estimate
Global deep ocean (Sundquist 1985)
particulate C flux
from surface 1.6 7.3 4.45
Marine organic (Sundquist 1985)
burial (shelves) 0.0063 0.75 0.378
Marine dissolved (Tans et al 1990)
inorganic 1.0 2.8 1.9* (Quay et al 1992)
Carbonate burial (Sundquist 1985)
shelves overall
(0.072 min 0.48 max)
minus reefs 0.11
0.0 0.37 0.18
Carbonate coral reefs 0.11 0.11 0.11 (Kinsey 1991)
Deep oceans marine (Sundquist 1985)
carbonate flux from
surface 0.42 1.18 0.75
Global peat 0.277 0.42 0.348
(this paper, Euroconsult 1984, Adams et.al. 1990)
Soils 0.0 0.4 (Schlisinger 1990)
(subtract 50% for without
double counting with counting
peat) 0.2 marine
Terrestrial vegetation dissolved
..assumed in balance.... + = - ................. inorganic
Fresh water 0.8 (Hall 1989)
-------------------------------------------------------------------
Total sink 3.412 13.08 8.710 6.81*
Median sink 9.66 6.35
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Volcanic/ (Malling 1991, Gerlach 1991)
geological discharges 0.2 0.5 0.35 0.35
Anthropogenic addition (for 1990, approximately) 10.00 10.00
(6.0 fossil fuel, 3.0Gt biomass burn, 1 Gt soil rel.)--------------
Total addition 10.35 10.35
---------------
0.4% annual increase of 752 Gt C in atmosphere
(353 ppmv CO2) 3.30 3.30
---------------
Difference, Total addition - Total sink (10.35-8.71) 1.64 3.54
Difference, Total addition - Median sink (10.35-9.66) 0.69 4.00
---------------
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