Hostname: page-component-7dd5485656-gs9qr Total loading time: 0 Render date: 2025-10-30T01:34:14.431Z Has data issue: false hasContentIssue false
  • English
  • Français

Comparison of Independent Δ14CO2 Records at Point Barrow, Alaska

Published online by Cambridge University Press:  09 February 2016

H D Graven ,
X Xu ,
T P Guilderson ,
R F Keeling ,
S E Trumbore  and
S Tyler
H D Graven*
Affiliation:
Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093-0244, USA
X Xu
Affiliation:
Department of Earth System Science, University of California, Irvine, Irvine, California 92697-3100, USA
T P Guilderson
Affiliation:
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory L-397, 7000 East Ave., Livermore, California 94550, USA Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, California 95064, USA
R F Keeling
Affiliation:
Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093-0244, USA
S E Trumbore
Affiliation:
Max Planck Institute of Biogeochemistry, Postfach 10 01 64, 07701 Jena, Germany
S Tyler
Affiliation:
Department of Earth System Science, University of California, Irvine, Irvine, California 92697-3100, USA
*
2 Corresponding author. Email: hgraven@ucsd.edu.
Get access Rights & Permissions [Opens in a new window]

Abstract

Two independent programs have collected and analyzed atmospheric CO2 samples from Point Barrow, Alaska, for radiocarbon content (Δ14C) over the period 2003–2007. In one program, flask collection, stable isotope analysis, and CO2 extraction are performed by the Scripps Institution of Oceanography's CO2 Program and CO2 is 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.

Information

Type
Atmospheric Carbon Cycle
Information
Radiocarbon , Volume 55 , Issue 3: Proceedings of the 21st International Radiocarbon Conference (Part 2 of 2) , 2013 , pp. 1541 - 1545
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

Graven, HD. 2008. Advancing the use of radiocarbon in studies of global and regional carbon cycling with high precision measurements of 14C in CO2 from the Scripps CO2 Program [PhD thesis]. La Jolla: Scripps Institute of Oceanography, University of California, San Diego.Google Scholar
Graven, HD, Guilderson, TP, Keeling, RF. 2007. Methods for high-precision 14C AMS measurement of atmospheric CO2 at LLNL. Radiocarbon 49(2):349–56.Google Scholar
Graven, HD, Stephens, BB, Guilderson, TP, Keeling, RF, Campos, TL, Campbell, JE, Schimel, DS. 2009. Estimates of biospheric and fossil fuel-derived CO2 and fossil fuel CO2:CO ratios from airborne measurements of Δ14C, CO2, and CO above Colorado. Tellus B 61(3):536–46.Google Scholar
Graven, HD, Guilderson, TP, Keeling, RF. 2012. Observations of radiocarbon in CO2 at seven global sampling sites in the Scripps flask network: analysis of spatial gradients and seasonal cycles. Journal of Geophysical Research 117: D02303, doi:10.1029/2011JD016535.Google Scholar
Hudec, VC, Trivett, NBA. 1997. An evaluation of CO2 flask measurement programs at Alert, N.W.T. In: Report of the Eighth WMO Meeting of Experts on Carbon Dioxide Concentration and Isotopic Measurement Techniques, Boulder, USA, 6–11 July 1995. WMO TD No. 821. Geneva: World Meteorological Organization Atmospheric Watch. p 42–57.Google Scholar
Keeling, CD, Piper, SC, Bacastow, RB, Wahlen, M, Whorf, TP, Heimann, M, Meijer, HA. 2001. Exchanges of atmospheric CO2 and 13CO2 with the terrestrial biosphere and oceans from 1978 to 2000. I. Global aspects, SIO Reference Series, No. 01-06, Scripps Institution of Oceanography, San Diego. 88 p.Google Scholar
Masarie, KA, Langenfelds, RL, Allison, CE, Conway, TJ, Dlugokencky, EJ, Francey, RJ, Novelli, PC, Steele, LP, Tans, PP, Vaughn, B, White, JWC. 2001. NOAA/CSIRO Flask Air Intercomparison Experiment: a strategy for directly assessing consistency among atmospheric measurements made by independent laboratories. Journal of Geophysical Research 106(D17):20,445–64.CrossRefGoogle Scholar
Miller, J, Wolak, C, Lehman, S, Allison, C, Graven, H, Guilderson, T, Keeling, R, Meijer, H, Nakamura, T, Nakazawa, T, Neubert, R, Smith, A, Southon, J, Xu, X. 2011. Preliminary results from the first inter-comparison of accelerator mass spectrometry atmospheric 14CO2 measurements. In: Brand, W, editor. Report of the 15th WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurement Techniques, 2009. Report 194. Geneva: World Meteorological Organization Atmospheric Watch. p 216–8.Google Scholar
Miller, J, Lehman, S, Wolak, C, Turnbull, J, Dunn, G, Graven, H, Keeling, R, Meijer, HAJ, Aerts-Bijma, AT, Palstra, SWL, Smith, AM, Allison, C, Southon, J, Xu, X, Nakazawa, T, Aoki, S, Nakamura, T, Guilderson, T, LaFranchi, B, Mukai, H, Terao, Y, Uchida, M, Kondo, M. 2013. Initial results of an intercomparison of AMS-based atmospheric 14CO2 measurements. Radiocarbon, these proceedings, doi:10.2458/azu_js_rc.55.16382.Google Scholar
Newman, S, Jeong, S, Fischer, ML, Xu, X, Haman, CL, Lefer, B, Alvarez, S, Rappenglueck, B, Kort, EA, Andrews, A, Peischl, J, Gurney, KR, Miller, CE, Yung, YL. 2012. Diurnal tracking of anthropogenic CO2 emissions in the Los Angeles basin megacity during spring 2010. Atmospheric Chemistry and Physics Discussions 12:5771–801.Google Scholar
Polach, H. 1989. 14CARE. Radiocarbon 31(3):422–30.Google Scholar
Scott, EM. 2003. The Third International Radiocarbon Intercomparison (TIRI) and the Fourth International Radiocarbon Intercomparison (FIRI), 1990–2002. Results, Analyses, and Conclusions. Radiocarbon 45(2):135–408.Google Scholar
Stuiver, M, Polach, HA. 1977. Discussion: reporting of 14C data. Radiocarbon 19(3):355–63.Google Scholar
Thoning, KW, Kitzis, DR, Crotwell, A. 2012. Atmospheric Carbon Dioxide Dry Air Mole Fractions from quasi-continuous measurements at Barrow, Alaska; Mauna Loa, Hawaii; American Samoa; and South Pole, 1973–2011. Version: 2012-05-07. Path: ftp://ftp.cmdl.noaa.gov/ccg/co2/in-situ/.Google Scholar
Tyler, SC, Rice, A, Ajie, HL. 2007. Stable isotope ratios in atmospheric CH4: implications for seasonal sources and sinks. Journal of Geophysical Research 112: D03303, doi:10.1029/2006JD007231.Google Scholar
World Meteorological Organization [WMO]. 2011. Expert group recommendations. In: Brand, W, editor. Report of the 15th WMO/IAEA Meeting of CO2 Experts on Carbon Dioxide, Other Greenhouse Gases and Related Tracers Measurements Techniques, Jena, Germany, 7–10 September 2009. WMO TD No. 1553. Geneva: World Meteorological Organization Atmospheric Watch. p 1–37.Google Scholar
Xu, X, Trumbore, SE, Ajie, H, Tyler, S. 2007a. 14C of atmospheric CO2 over the subtropical and equatorial Pacific from fall 2002 to summer 2005 and at Point Barrow, Alaska, USA from 2002 to 2007. Eos Transactions AGU 88(52), Fall Meeting Supplement, Abstract B43D-1581.Google Scholar
Xu, X, Trumbore, SE, Zheng, S, Southon, JR, McDuffee, KE, Luttgen, M, Liu, JC. 2007b. Modifying a sealed tube zinc reduction method for preparation of AMS graphite targets: reducing background and attaining high precision. Nuclear Instruments and Methods in Physics Research B 259(1):320–9.Google Scholar