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12-Sep-2019 12:56

At present, too few measurements of 14C in the atmosphere exist to explicitly test the model prediction shown in the figure left.Accelerator mass spectrometry (AMS) is a form of mass spectrometry that accelerates ions to extraordinarily high kinetic energies before mass analysis.also occurred in the past, presumably related to shifts in global climate.Carbon dioxide in the atmosphere exchanges dynamically with carbon dissolved in oceans and stored in plants and soils on land (figure 3).More research is necessary to explain past changes in COC produced by atmospheric weapons testing (between 19), as it dissolves in surface oceans and is taken up and respired by land plants can be traced.On longer timescales, the radioactive decay of C provides information on slower exchanges with the much larger stores of carbon in the deep ocean and the carbon stabilized in soils and sediments.

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Figure 3: Model-generated prediction (Randerson, unpublished) of the global variation of radiocarbon content in the carbon dioxide in the lower atmosphere (expressed as the deviation in parts per thousand from carbon dioxide at the South Pole).After this stage, no background is left, unless a stable (atomic) isobar forming negative ions exists (e.g. Purser and colleagues also published the successful detection of radiocarbon using their tandem at Rochester.



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