Seasonal variation of carbon monoxide at remote sites in Japan

Daiju Narita, Pakpong Pochanart, Jun Matsumoto, Kazuaki Someno, Hiroshi Tanimoto, Jun Hirokawa, Yoshizumi Kajii, Hajime Akimoto*, Makoto Nakao, Takao Katsuno, Yoshikatsu Kinjo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Continuous measurement of CO has been carried out at remote sites in Japan, Oki (36°N), Happo (36°N) and Benoki (27°N). Seasonal variation at each site exhibited a clear cycle with a maximum in spring and a minimum in summer. It has been revealed that the concentrations of CO at Oki are substantially higher than at Mace Head throughout a year. Comparison of trajectory-categorized data between Oki and Mace Head has been made to elucidate that the concentration at Oki is higher than Mace Head both in the clean "background" and in the regionally polluted air mass. The spring maximum at Oki occurs in April that is one month later than the reported data at other remote sites in the northern hemisphere.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalChemosphere - Global Change Science
Issue number1-3
Publication statusPublished - 1999 Jan 1
Externally publishedYes


  • Background air mass
  • Carbon monoxide
  • East Asia
  • Regionally polluted air mass
  • Seasonal variation
  • Spring maximum
  • Trajectory categorization

ASJC Scopus subject areas

  • Global and Planetary Change


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