Rapid response of tree cellulose radiocarbon content to changes in atmospheric <sup>14</sup>CO<sub>2</sub> concentration
Pieter Meiert GrootesNuclear Physics Laboratory and Department of PhysicsGeorge FarwellNuclear Physics Laboratory and Department of PhysicsFred SchmidtNuclear Physics Laboratory and Department of PhysicsD. D. LeachNuclear Physics Laboratory and Department of PhysicsM. StuiverQuaternary Isotope Laboratoryt, and Department of Geological Sciencest. University of Washington, Seattle, WA 98195, USA
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A detailed radial profile for the 14C concentration in tree stem cellulose, covering growth rings for the years 1962—1964, was obtained for a Sitka spruce of the US Pacific Coast using accelerator mass spectrometry. The tree cellulose 14C closely follows atmospheric 14CO2 concentrations, responding to changes with an apparent delay of 5 to 6 weeks. The delay in response is mostly due to the addition of between 13% and 28% of biospheric CO2 to the canopy-air CO2 used by the tree for stem cellulose. Delayed incorporation and the use of stored photosynthate of the previous fall appear less important.
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