World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

The Atmospheric Cycling of Radiomethane and the Fossil Fraction of the Methane Source : Volume 7, Issue 8 (02/05/2007)

By Lassey, K. R.

Click here to view

Book Id: WPLBN0003994775
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: The Atmospheric Cycling of Radiomethane and the Fossil Fraction of the Methane Source : Volume 7, Issue 8 (02/05/2007)  
Author: Lassey, K. R.
Volume: Vol. 7, Issue 8
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Lassey, K. R., Smith, A. M., & Lowe, D. C. (2007). The Atmospheric Cycling of Radiomethane and the Fossil Fraction of the Methane Source : Volume 7, Issue 8 (02/05/2007). Retrieved from

Description: National Institute of Water and Atmospheric Research, P.O. Box 14-901, Wellington, New Zealand. The cycling of 14CH4 (radiomethane) through the atmosphere has been strongly perturbed in the industrial era by the release of 14C-free methane from geologic reservoirs (fossil methane emissions), and in the nuclear era, especially since ca 1970, by the direct release of nucleogenic radiomethane from nuclear power facilities. Contemporary measurements of atmospheric radiomethane have been used to estimate the proportion of fossil methane in the global methane source (the fossil fraction), but such estimates carry high uncertainty due to the ill-determined nuclear-power source. Guided by a mass-balance formulation in a companion paper, we apply a contemporary time series of atmospheric radiomethane to quantify both the fossil fraction and the strength of the nuclear power source. We deduce that 30.0±2.3% (1 s.d.) of the global methane source for 1986–2000 has fossil origin, a fraction which may include some 14C-depleted refractory carbon such as from aged peat deposits. Since this estimate depends upon the validity of assumptions underlying a linear regression model, it should be seen as providing a plausible re-estimate rather than a definitive revision. Such a fossil fraction would be much larger (by 50%) than is commonly accepted, with implications for inventory compilation. The co-estimated strength of the global nuclear-power source of radiomethane is consistent with values inferred independently from local nuclear facilities.

The atmospheric cycling of radiomethane and the fossil fraction of the methane source

Bousquet, P., Ciais, P., Miller, J. B., Dlugokencky, E. J., Hauglustaine, D. A., Prigent, C., van der Werf, G. R., Peylin, P., Brunke, E.-G., Carouge, C., Langenfelds, R. L., Lathière, J., Papa, F., Ramonet, M., Schmidt, M., Steele, L. P., Tyler, S. C., and White, J.: Contribution of anthropogenic and natural sources to atmospheric methane variability, Nature, 443, 439–443, 2006.; Cunnold, D. M., Steele, L. P., Fraser, P. J., Simmonds, P. G., Prinn, R. G., Weiss, R. F., Porter, L. W., O'Doherty, S., Langenfelds, R. L., Krummel, P. B., Wang, H. J., Emmons, L., Tie, X. X., and Dlugokencky, E. J.: In situ measurements of atmospheric methane at GAGE/AGAGE sites during 1985–2000 and resulting source inferences, J. Geophys. Res., 107, doi:10.1029/2001JD001226, 2002.; Dlugokencky, E. J., Masarie, K. A., Lang, P. M., Tans, P. P., Steele, L. P., and Nisbet, E. G.: A dramatic decrease in the growth rate of atmospheric methane in the northern hemisphere during 1992, Geophys. Res. Lett., 21, 45–48, 1994.; Dlugokencky, E. J., Masarie, K. A., Lang, P. M., and Tans, P. P.: Continuing decline in the growth rate of the atmospheric methane burden, Nature, 393, 447–450, 1998.; Dlugokencky, E. J., Houweling, S., Bruhwiler, L., Masarie, K. A., Lang, P. M., Miller, J. B., and Tans, P. P.: Atmospheric methane levels off: Temporary pause or a new steady-state?, Geophys. Res. Lett., 30, 1992, doi:10.1029/2003GL018126, 2003.; Ehhalt, D. H.: The atmospheric cycle of methane, Tellus, 26, 58–70, 1974.; Eisma, R., Vermeulen, A. T., and van der Borg, K.: $^14$CH4 emissions from nuclear power plants in northwestern Europe, Radiocarbon, 37, 475–483, 1995.; Etiope, G.: New directions: GEM–-Geologic emissions of methane, the missing source in the atmospheric methane budget, Atmos. Environ., 38, 3099–3100, 2004.; Etiope, G. and Klusman, R. W.: Geologic emissions of methane to the atmosphere, Chemosphere, 49, 777–789, 2002.; Houweling, S., Dentener, F., and Lelieveld, J.: Simulation of preindustrial methane to constrain the global source strength of natural wetlands, J. Geophys. Res., 105, 17 243–17 255, 2000.; Hua, Q. and Barbetti, M.: Review of tropospheric bomb $^14$C data for carbon cycle modeling and age calibration studies, Radiocarbon, 46, 1273–1298, 2004.; Judd, A. G.: Geological sources of methane, in: Atmospheric Methane: Its Role in the Global Environment, edited by: Khalil, M. A. K., Springer-Verlag, Berlin, 280–303, 2000.; Keppler, F., Hamilton, J. T. G., Braß, M., and Röckmann, T.: Methane emissions from terrestrial plants under aerobic conditions, Nature, 439, 187–191, 2006.; Kirchgessner, D. A., Piccot, S. D., and Masemore, S. S.: An improved inventory of methane emissions from coal mining in the United States, J. Air & Waste Manage. Assoc., 50, 1904–1919, 2000.; Kunz, C.: Carbon-14 discharge at three light-water reactors, Health Phys., 49, 25–35, 1985.; Lacroix, A. V.: Unaccounted-for sources of fossil and isotopically-enriched methane and their contribution to the emissions inventory: A review and synthesis, Chemosphere, 26, 505–557, 1993.; Lassey, K. R., Etheridge, D. M., Lowe, D. C., Smith, A. M., and Ferretti, D. F.: Centennial evolution of the atmospheric methane budget: What do the carbon isotopes tell us?, Atmos. Chem. Phys., 7, 2119–2139, 2007.; Lelieveld, J., Crutzen, P. J., and Dentener, F. J.: Changing concentration, lifetime and climate forcing of atmospheric methane, Tellus, 50B, 128–150, 1998.; Lowe, D. C., Brenninkmeijer, C. A. M., Manning, M. R., Sparks, R. J., and Wallace, G.: Radiocarbon determination of atmospheric methane at Baring Head, New Zealand, Nature, 332, 522–525, 1988.; MacFarling Meure, C., Etheridge, D., Trudinger, C., Steele, P., Langenfelds, R., van Ommen, T., Smith, A., and Elkins, J.: Law Dome CO&l


Click To View

Additional Books

  • Branch-level Measurement of Total Oh Rea... (by )
  • Relating Particle Hygroscopicity and Ccn... (by )
  • Validation of No2 and No from the Atmosp... (by )
  • Assessing Large-scale Weekly Cycles in M... (by )
  • Influence of the North Atlantic Oscillat... (by )
  • Interpreting Elevated Space-borne Hcho C... (by )
  • Sources of Carbonaceous Aerosols and Dep... (by )
  • Inversion of Long-lived Trace Gas Emissi... (by )
  • Concurrent Observations of Air Pollutant... (by )
  • Water Vapour Profiles from Raman Lidar A... (by )
  • Aerosol Optical Properties and Radiative... (by )
  • Alignment of Atmospheric Mineral Dust Du... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.