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As temperature rises, so does the concentration of CO2 in the atmosphere.
Note that this graph does not prove who drives whom, but as atmospheric temperature stabilised and even declined in the years 1998-2008, while oceans continued to warm, it becomes defensible that rising ocean temperature is the driving force behind rising concentrations of CO2, as explained above.
[for more about where the carbon is locked up on land, look at soil54]This diagram shows the latest figures (after Holmen, 2000) with residence times and today's atmospheric carbon at 700Gt.
The land has been split in two compartments and the oceans in three.
Note that Endersbee's figure is a blessing in disguise, because it is impossible to calculate or estimate CO2 outgassing from the solubility in water.
For instance: For instance, assuming a rate of 3%/ºC degassing at global average temperature (see part1), and an amount of 38,000Gt (C) dissolved CO2, the amount outgassed for the whole ocean would be 1,140Gt/ºC (Carbon) or 635ppmv/ºC for the whole ocean.
Over the past two decades scientists gained a fair understanding of where all carbon is found and how much of it circulates between atmosphere, land and sea, although significant differences can be found among authors.
As one can see, the human contribution is about 8Pg carbon per year (8Gt, billions of tons) against a global respiration rate of about 100-250Pg/y (fossil fuel alone: 2%, some say 3%).
At the bottom of the diagram, a total of 0.4 Gt C/y is sequestered 'permanently' in sediments.
In this respect the sea is in a better position, as it already contains some 40,000 Gt, as in 60 years time it would have increased by only 0.3% Gt C.
Thus the sea will most likely be the ultimate carbon sink, "Eighty percent of inputs from land to sea are deposited here [in coastal margins], and 85% of organic carbon and 45% of inorganic carbon are buried in the ocean margin sediments (Gattuso et al., 1998a; Wollast, 1998; Chen et al., 2003)".
Thus oceans stabilise the CO2 fluctuations from the seasons and the differences between ocean and land.
The oceans contain far more CO2 than air: 38,000Gt versus 700 Gt (about 50 times).
The surface 100m with 600Gt C is perturbed a few times per year, contributing almost instantly to warming, or 18 Gt/ºC (carbon), or 10ppmv/ºC. Endersbee's figure of ~300 lies comfortably between .