Issue Date
1992-01-01Keywords
Olympic Peninsulasolar cycles
cosmochronology
Washington
Mackenzie Delta
Mackenzie District Northwest Territories
Canada
Northwest Territories
Western Canada
atmosphere
tree rings
United States
C 14
carbon
isotopes
radioactive isotopes
carbon dioxide
Metadata
Show full item recordCitation
Damon, P. E., Burr, G., Cain, W. J., & Donahue, D. J. (1992). Anomalous 11-year Delta-14C cycle at high latitudes?. Radiocarbon, 34(2), 235-238.Journal
RadiocarbonAdditional Links
http://radiocarbon.webhost.uits.arizona.edu/Abstract
We find no evidence for an anomalously intense 11-yr cycle in Delta-14C 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 degrees N, 130 degrees W), with atmospheric 14C depressed by 2.6 +/0.9 (mean of sigma) % relative to the Olympic Peninsula. Such an effect would require only 5% of CO2 in the air mass to have been derived from 5% 14C-depleted soil gas CO2. This small but apparently significant regional effect could be caused by accumulation of CO2 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.Type
Articletext
Language
enISSN
0033-8222ae974a485f413a2113503eed53cd6c53
10.1017/S0033822200013679