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Accelerator mass spectrometry ams radiocarbon dating

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Figure 3: Model-generated prediction (Randerson, unpublished) of the global variation of radiocarbon content in the carbon dioxide in the lower atmosphere (expressed as the deviation in parts per thousand from carbon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

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.

Figure 1: Carbon dioxide record derived from air bubbles trapped in the Vostock Ice Core, Antarctica(Barnola et al. CO2 levels fluctuated between about 190 and 280 parts per million (ppm, where 1 ppm = 1 molecule of carbon dioxide per million molecules of air). This data shows that atmospheric carbon dioxide levels now are higher than those in the past 400,000 years.

Carbon dioxide levels have risen rapidly since about 1850 AD. Figure 2: The carbon cycle is the sum of interacting processes that act to exchange carbon amoung atmosphere, land, or ocean are relatively small and for the most part have large uncertianty.

Changes in atmospheric CO clearly must be explained by repartitioning of carbon among these three reservoirs.

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.

The predominance of 14C-depleted air in the northern hemisphere is the result of burning of fossil fuels, which contian zero radiocarbon.

While the roughly 30% increase in CO 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).

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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The amount of carbon dioxide in the atmosphere today is higher than that at any time in the last 420,000 years (figure 1).

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