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One of the most commonly referenced reservoir effects concerns the ocean.The average difference between a radiocarbon date of a terrestrial sample such as a tree, and a shell from the marine environment is about 400 radiocarbon years (see Stuiver and Braziunas, 1993).[A Conventional Radiocarbon Age or CRA, does not take into account specific differences between the activity of different carbon reservoirs.A CRA is derived using an age calculation based upon the decay corrected activity of the absolute radiocarbon standard (1890 AD wood) which is in equilibrium with atmospheric radiocarbon levels (as mentioned previously, 1890 wood is no longer used as the primary radiocarbon standard, instead Oxalic Acid standards I and II were correlated with the activity of the original standard).The volcanic effect has a limited distance however. (1980) found that at 200 m away from the source, plants yielded an age in agreement with that expected.They suggested that the influence of depleted CO2 declined rapidly with increasing distance from the source.A shellfish alive today in a lake within a limestone catchment, for instance, will yield a radiocarbon date which is excessively old.The reason for this anomaly is that the limestone, which is weathered and dissolved into bicarbonate, has no radioactive carbon.

One modern plant growing near the emanations had an apparent age of 1390 yr.

In this page, we consider natural reservoir variations and variations brought about by human interaction].

Radiocarbon samples which obtain their carbon from a different source (or reservoir) than atmospheric carbon may yield what is termed apparent ages.

The logical conclusion from this was that in order to obtain a modern radiocarbon reference standard, representing the radiocarbon activity of the 'present day', one could not very well use wood which grew in the 1900's since it was affected by this industrial effect.

Thus it was that 1890 wood was used as the modern radiocarbon standard, extrapolated for decay to 1950 AD.

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