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.

Stable carbon- and hydrogen-isotope ratios of subfossil oaks in southern Germany: methodology and application to a composite record for the Holocene

The Holocene ◽  
2003 ◽  
Vol 13 (3) ◽  
pp. 393-402 ◽  
Author(s):  
Christoph Mayr ◽  
Burkhard Frenzel ◽  
Michael Friedrich ◽  
Marco Spurk ◽  
Willibald Stichler ◽  
...  
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Ratios ◽  
Stable Carbon ◽  
Southern Germany ◽  
The Holocene ◽  
Hydrogen Isotope Ratios ◽  
Carbon And Hydrogen Isotope

Relationships between carbon and hydrogen isotope ratios and nitrogen levels in leaves of

Trees ◽  
1996 ◽  
Vol 10 (6) ◽  
pp. 351 ◽  
Author(s):  
M. Diaz ◽  
A. Haag-Kerwer ◽  
R. Wingfield ◽  
E. Ball ◽  
E. Olivares ◽  
...  
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Ratios ◽  
Nitrogen Levels ◽  
Hydrogen Isotope Ratios ◽  
Carbon And Hydrogen Isotope

scholarly journals Comparisons of stable isotope (C, H, N) signatures for revealing organic matter sources and trophic relationships in headwater streams

2017 ◽  
Vol 74 (12) ◽  
pp. 2110-2121 ◽  
Author(s):  
Henry M. Page ◽  
Scott D. Cooper ◽  
Sheila W. Wiseman ◽  
Danuta Bennett ◽  
Kristie Klose ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Hydrogen Isotope ◽  
Southern California ◽  
Headwater Streams ◽  
Isotope Ratios ◽  
Mixing Model ◽  
Gut Contents ◽  
Stable Carbon ◽  
Predator Diet ◽  
Hydrogen Isotope Ratios

We compared the efficacy of stable carbon, hydrogen, and nitrogen isotope ratios in identifying the resources used by insect consumers in headwater streams of southern California. We also compared gut contents with consumer stable isotope ratios and mixing model estimates of resource contributions to predator diet. Stable hydrogen isotope ratios (as δ2H) of algivores were well separated from ratios for detritivores, whereas relationships between stable carbon (as δ13C) and nitrogen (as δ15N) ratios of consumers and their expected diets were weaker and more ambiguous. δ2H values of primary consumers more strongly reflected the proportions of their gut contents consisting of algae than δ13C values. Τhe proportions of algivorous prey in predator gut contents increased with mixing model estimates of algivore contributions to predator diet using δ2H but not δ13C values. Our findings support the use of hydrogen isotope ratios in food web studies of streams in southern California and their potential use in assessing the effects of anthropogenic and natural disturbance on basal resource contributions to food webs that might not otherwise be identified using carbon isotope ratios.

Carbon and hydrogen isotope ratios of bryophytes from arid and humid regions

Oecologia ◽  
1979 ◽  
Vol 44 (1) ◽  
pp. 91-94 ◽  
Author(s):  
Philip W. Rundel ◽  
W. Stichler ◽  
Richard H. Zander ◽  
H. Ziegler
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Ratios ◽  
Hydrogen Isotope Ratios ◽  
Carbon And Hydrogen Isotope
Sign in / Sign up

Export Citation Format

Share Document