Abstract
A stomatal frequency record based on buried Tsuga hetero- phylla needles reveals significant centennial-scale atmospheric CO2 fluctuations during the last millennium. The record includes four CO2 minima of 260-275 ppmv (ca. A.D. 860 and A.D. 1150, and less prominently, ca. A.D. 1600 and 1800). Alternating CO2 max- ima of 300-320 ppmv are present at A.D. 1000, A.D. 1300, and ca. A.D. 1700. These CO2 fluctuations parallel global terrestrial air temperature changes, as well as oceanic surface temperature fluc- tuations in the North Atlantic. The results obtained in this study corroborate the notion of a continuous coupling of the preindus- trial atmospheric CO2 regime and climate.
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