Journal
SCIENCE
Volume 294, Issue 5551, Pages 2529-2532Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1066114
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Radiocarbon dating methods typically assume that there are no significant tropospheric (CO2)-C-14 gradients within the low- to mid-latitude zone of the Northern Hemisphere. Comparison of tree ring C-14 data from southern Germany and Anatolia supports this assumption in general but also documents episodes of significant short-term regional (CO2)-C-14 offsets. We suggest that the offset is caused by an enhanced seasonal (CO2)-C-14. cycle, with seasonally peaked flux of stratospheric C-14 into the troposphere during periods of low solar magnetic activity, coinciding with substantial atmospheric cooling. Short-term episodes of regional (CO2)-C-14, offsets are important to palaeoclimate studies and to high-resolution archaeological dating.
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