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Also shown on this plot are the data collected between 1958 and the present by C. Relatively small imbalances in the natural cycles also influence the atmospheric CO2 concentration.

Figure 3: Model-generated prediction (Randerson, unpublished) of the global variation of radiocarbon content in the carbon dioxide in the lower atmosphere (expressed as the deviation in parts per thousand from carbon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).

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Radiocarbon is the best and often the only way to quantify rates of exchange of carbon among reservoirs.

This is the key to achieving predictive understanding of the carbon cycle.

At present, too few measurements of 14C in the atmosphere exist to explicitly test the model prediction shown in the figure left.

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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.

In 2001, ESS/CGECR researchers Ellen Druffel, John Southon and Susan Trumbore were awarded million by the W. Keck Foundation for the development of an accelerator mass spectrometry (AMS) facility – the Keck-Carbon Cycle AMS facility - for radiocarbon measurements in support of carbon cycle research at University of California, Irvine.

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