Differences of the atmospheric CH4 concentration between the Arctic and Antarctic regions in pre‐industrial/pre‐agricultural era

T. Nakazawa, T. Machida, M. Tanaka, Y. Fujii, S. Aoki, O. Watanabe

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46 Citations (Scopus)

Abstract

Air samples in ice cores from Site J, Greenland and Mizuho, Antarctica were analyzed to reconstruct the past concentrations of atmospheric CH4 at northern and southern high latitudes. The results showed that the CH4 concentrations were fairly constant in the pre‐industrial/pre‐agricultural era covered by this study, average values being 756±10 and 701±10 ppbv for the Site J and Mizuho cores, respectively, and then increased significantly with time. The pre‐industrial/pre‐agricultural levels of the CH4 concentration obtained from the Site J core were higher by 55±20 ppbv than those from the Mizuho core, suggesting that natural CH4 sources had been stronger in the northern hemisphere than in the southern hemisphere.

Original languageEnglish
Pages (from-to)943-946
Number of pages4
JournalGeophysical Research Letters
Volume20
Issue number10
DOIs
Publication statusPublished - 1993 May 21
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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