Comparison of Independent Δ14CO2 records at Point Barrow, Alaska

Abstract

Two independent programs have collected and analyzed atmospheric CO2samples from Point Barrow, Alaska, for radiocarbon content (Δ14C) over the period 2003-2007. In one program, flask collection, stable isotope analysis, and CO2extraction are performed by the Scripps Institution of Oceanography's CO2Program and CO2is graphitized and measured by accelerator mass spectrometry (AMS) at Lawrence Livermore National Laboratory. In the other program, the University of California, Irvine, performs flask collection, sample preparation, and AMS. Over 22 common sample dates spanning 5 yr, differences in measured Δ14C are consistent with the reported uncertainties and there is no significant bias between the programs. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona.