Preliminary investigations show regional differences in atmospheric 14 C activity archived in tree‐ring cellulose may reflect oceanic and atmospheric shifts associated with ENSO (El Niño‐Southern Oscillation) events. Much of the shared variation between sites in Washington and Arizona can be attributed to global forcings such as anthropogenic 14 C‐depleted CO 2 emissions and modulation of 14 C production. The contrasted residual variation between the Washington and Arizona data sets correlates with the annual Southern Oscillation Index (SOI) of the previous year. The spatial differences between Δ 14 C data sets may provide a proxy indicator of ENSO phenomenon.
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Jirikowic et al. (1993) studied this question.
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