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Carbon dioxide also dissolves in water and thus permeates the oceans, but at a slower rate.has been estimated to be roughly 12 to 16 years in the northern hemisphere.

Plants fix atmospheric carbon during photosynthesis, so the level of C level for the calculation can either be estimated, or else directly compared with known year-by-year data from tree-ring data (dendrochronology) up to 10,000 years ago (using overlapping data from live and dead trees in a given area), or else from cave deposits (speleothems), back to about 45,000 years before the present.Liquid scintillation counting is the preferred method.during his tenure as a professor at the University of Chicago.Carbon-14 is produced in the upper layers of the troposphere and the stratosphere by thermal neutrons absorbed by nitrogen atoms.When cosmic rays enter the atmosphere, they undergo various transformations, including the production of neutrons.

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