Temporal variations of the carbon isotopic ratio of atmospheric methane observed at Ny Ålesund, Svalbard from 1996 to 2004

Shinji Morimoto, Shuji Aoki, Takakiyo Nakazawa, Takashi Yamanouchi

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Systematic observations of the atmospheric CH4 mole fraction and its carbon isotope ratio δ13CH4 have been carried out at NY Ålesund, Svalbard (78°55′N, 11°56′E) since 1991 and 1996, respectively. The CH4 and δ13CH4 showed clear seasonal cycles with respective peak-to-peak amplitudes of 48 ppb and 0.42‰. By comparing the anomalies in the increase rate of the CH4 with those of δ13CH4, it is suggested that the cause of the rapid increase in the CH4 mole fraction observed at NY Ålesund in 1998 could be attributable to an enhanced CH4 release from wetland and biomass burning.

Original languageEnglish
JournalGeophysical Research Letters
Volume33
Issue number1
DOIs
Publication statusPublished - 2006 Jan 16

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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