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We find no evidence for an anomalously intense 11-yr cycle in Δ 14 C at high latitudes during the period, AD 1870–1885, as reported by Fan et al . (1983, 1986). However, there does appear to be a regional effect within the MacKenzie River region (67°N, 130°W), with atmospheric 14 C depressed by relative to the Olympic Peninsula. Such an effect would require only 5% of CO 2 in the air mass to have been derived from 5% 14 C-depleted soil gas CO 2 . This small but apparently significant regional effect could be caused by accumulation of CO 2 within the frozen earth followed by outgassing during the spring thaw. The short growing season would enhance the effect by allowing insufficient time for global atmospheric equilibration.
Damon et al. (Wed,) studied this question.