Ocean chemistry of the fossil fuel CO2 signal: The haline signal of ``business as usual''

Mathematics – Logic

Scientific paper

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Global Change: Oceans, Global Change: Biogeochemical Processes, Oceanography: Biological And Chemical: Carbon Cycling, Oceanography: Biological And Chemical: Inorganic Marine Chemistry

Scientific paper

The increasing fossil fuel CO2 signal in surface ocean waters, superimposed upon the natural background, has now reached the level of about 2mgkg-1, and thus, if we were to conceive of this as a separate signal, it has become a new component of the salinity of sea water in its own right. By the year 2100, under the IPCC ``Business as Usual'' scenario, the fossil fuel signal will exceed in mass the contributions of fluoride, boron, or strontium ions to the salinity of the surface ocean waters, and will reduce the pre-industrial carbonate iron concentration by about 55%. However the net effect of this massive chemical transfer to the ocean has not been to cause a haline contraction, but to increase the volume of the ocean by about 330×109m3 today. The water flux from fossil combustion, of about 10.5×109m3yr-1, adds to this volume change.

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