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Modern radiocarbon levels for northwestern Mexico derived from tree rings: A comparison with northern hemisphere zones 2 and 3 curves

AuthorsBeramendi-Orosco, Laura E.; Santos, F. J. ; Gómez-Martínez, Isabel
Issue Date2010
PublisherUniversity of Arizona
CitationRadiocarbon 52(3): 907-914 (2010)
AbstractThe radiocarbon variation for northwestern Mexico during the period 1950-2004 was studied by accelerator mass spectrometry (AMS) and liquid scintillation counting (LSC) analyses of tree rings. Two tree-ring sequences of Pseudotsuga menziesii, sampled in a site isolated from urban centers and active volcanoes (26.18°N, 106.3°W, 3000 m asl), were dendrochronologically dated and separated in annual rings prior to 14C analysis. Results obtained show a similar profile to the values reported for the Northern Hemisphere (NH), having significant correlation coefficients with the compilation curves for NH zone 2 (r = 0.987, p < 0.001) and NH zone 3 (r = 0.993, p < 0.001). The maximum peak is centered at 1964.5 with a Δ14C value of 713.15 ± 9.3‰. The values obtained for the period 1958-1965 are lower than zone 2 values and higher than zone 3 values. For the period 1975-2004, the values obtained are higher than the NH compilation curve and other NH records. We attribute the first divergence to the North American monsoon that may have carried 14C-depleted air from the south during the summer months; the second divergence may be attributable to 14C-enriched biospheric CO2. © 2010 by the Arizona Board of Regents on behalf of the University of Arizona.
DescriptionProceedings of the 20th International Radiocarbon Conference.-- This work is licensed under a Creative Commons Attribution 3.0 License.-- et al.
Publisher version (URL)https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3590
Identifiersissn: 0033-8222
Appears in Collections:(CNA) Artículos
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