Spatial distribution of microbial methane production pathways in temperate zone wetland soils: Stable carbon and hydrogen isotope evidence

1997 ◽  
Vol 61 (4) ◽  
pp. 745-753 ◽  
Author(s):  
Edward R.C. Hornibrook ◽  
Frederick J. Longstaffe ◽  
William S. Fyfe
Keyword(s):  
Spatial Distribution ◽  
Methane Production ◽  
Hydrogen Isotope ◽  
Temperate Zone ◽  
Wetland Soils ◽  
Stable Carbon ◽  
Isotope Evidence ◽  
Carbon And Hydrogen Isotope

scholarly journals Intercomparisons of δ<sup>13</sup>C and δD measurements of atmospheric CH<sub>4</sub> for combined use of datasets from different laboratories

2017 ◽  
Author(s):  
Taku Umezawa ◽  
Carl A. M. Brenninkmeijer ◽  
Thomas Röckmann ◽  
Carina van der Veen ◽  
Stanley C. Tyler ◽  
...  
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Ratios ◽  
Stable Carbon ◽  
Future Studies ◽  
Measurement Reproducibility ◽  
Combined Use ◽  
Intercomparison Exercises ◽  
Hydrogen Isotope Ratios ◽  
Carbon And Hydrogen Isotope

Abstract. We report results from intercomparison exercises between laboratories that conduct measurements of stable carbon and hydrogen isotope ratios of atmospheric CH4 (δ13C-CH4 and δD-CH4). The offsets between the laboratories are larger than the measurement reproducibility of individual laboratories. To disentangle plausible offsets between worldwide laboratories, we evaluated and critically assessed a large number of intercomparison results documented previously in the literature. The results indicate significant offsets of δ13C-CH4 and δD-CH4 measurements among datasets reported from different laboratories; the data spread over ranges of 0.5 ‰ for δ13C-CH4 and 13 ‰ for δD-CH4. The intercomparison results summarized in this study may be of help when combining isotope datasets from different laboratories in future studies.

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