التفاصيل البيبلوغرافية
| العنوان: |
Modern radiocarbon levels for northwestern Mexico derived from tree rings: A comparison with northern hemisphere zones 2 and 3 curves |
| المؤلفون: |
Beramendi-Orosco, Laura E., Santos, F. J., Gómez-Martínez, Isabel |
| بيانات النشر: |
University of Arizona |
| سنة النشر: |
2010 |
| المجموعة: |
Digital.CSIC (Consejo Superior de Investigaciones Científicas / Spanish National Research Council) |
| الوصف: |
Proceedings of the 20th International Radiocarbon Conference.-- This work is licensed under a Creative Commons Attribution 3.0 License.-- et al. ; The 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. ; The financial support from DGAPA–UNAM (Project IN-111608) is gratefully acknowledged. ; Peer Reviewed |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| Relation: |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3590; http://hdl.handle.net/10261/75019 |
| الاتاحة: |
http://hdl.handle.net/10261/75019 |
| Rights: |
open |
| رقم الانضمام: |
edsbas.441BF0B6 |
| قاعدة البيانات: |
BASE |