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  Seasonal variations in stable carbon and hydrogen isotope ratios in methane from rice fields

Marik, T., Fischer, H., Conen, F., & Smith, K. (2002). Seasonal variations in stable carbon and hydrogen isotope ratios in methane from rice fields. Global Biogeochemical Cycles, 16(4): 1094. doi:10.1029/2001GB001428.

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Genre: Journal Article
Alternative Title : Glob. Biogeochem. Cycle

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 Creators:
Marik, T.1, Author           
Fischer, H.1, Author           
Conen, F., Author
Smith, K., Author
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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Free keywords: methane; isotopes; rice paddies; TDLAS
 Abstract: [1] During two successive growing seasons, methane emissions from rice fields in Italy were measured. High-precision measurements of the methane C-13/C-12 and D/H ratios were carried out by mass spectrometry and tunable diode laser absorption spectrometry. Significant seasonal variations were found for both delta(13)C and deltaD. The results confirm earlier observations by Bergamaschi [1997] in finding a seasonal cycle with isotopically depleted methane in the main growing season and higher values at the beginning and the end of the season during drainage of the field. The measured delta(13)C diurnal cycles showed a strong correlation with the methane emission rate. The isotopic composition of methane, which depended on the season, can be explained by variations of the different pathways for methane production, oxidation, and release into the atmosphere. A model based on these parameters was able to reproduce the field measurements and indicate the principal causes of observed fluctuations in the isotopic methane composition.

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Language(s): eng - English
 Dates: 2002-10
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18227
ISI: 000180874100041
DOI: 10.1029/2001GB001428
 Degree: -

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Title: Global Biogeochemical Cycles
  Alternative Title : Glob. Biogeochem. Cycle
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 16 (4) Sequence Number: 1094 Start / End Page: - Identifier: ISSN: 0886-6236