Measurement of total OH reactivity by laser-induced pump and probe technique-comprehensive observations in the urban atmosphere of Tokyo

Ayako Yoshino, Yasuhiro Sadanaga, Keisuke Watanabe, Shungo Kato, Yuko Miyakawa, Jun Matsumoto, Yoshizumi Kajii

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Total OH reactivity was observed by use of the laser-induced pump and probe technique, and the urban air quality in Tokyo was diagnosed comprehensively. The concentrations of NOx, CO, O3, non-methane hydrocarbons (NMHCs) and oxygenated volatile organic compounds (OVOCs) were observed simultaneously. The observations were conducted in July and August 2003, and in January, February, May, and November 2004. Generally, the observed OH reactivity was higher than the calculated values derived using the observed concentrations of the trace species. The differences between the observed and calculated values in summer, spring, and autumn were approximately 30%. However, the difference in winter was smaller than those in the other seasons. In addition, while the differences observed in summer, spring, and autumn correlated with the total reactivity of the OVOCs (Σi kOVOCi[OVOCi](s-1), ki is rate constant of its compounds with OH), the correlations were not confirmed in the case of winter because atmospheric oxidation was less active and OVOCs levels were low in winter. These results suggest that the secondary products of the photochemical reactions in the atmosphere would be a missing sink for the OH loss process in the urban area.

Original languageEnglish
Pages (from-to)7869-7881
Number of pages13
JournalAtmospheric Environment
Volume40
Issue number40
DOIs
Publication statusPublished - 2006 Dec
Externally publishedYes

Fingerprint

urban atmosphere
Volatile organic compounds
volatile organic compound
pump
laser
probe
Pumps
Lasers
winter
autumn
nonmethane hydrocarbon
Photochemical reactions
summer
Air quality
Rate constants
air quality
urban area
Hydrocarbons
oxidation
Oxidation

Keywords

  • Laser-induced pump and probe technique
  • Total OH reactivity
  • Urban air quality

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Pollution

Cite this

Measurement of total OH reactivity by laser-induced pump and probe technique-comprehensive observations in the urban atmosphere of Tokyo. / Yoshino, Ayako; Sadanaga, Yasuhiro; Watanabe, Keisuke; Kato, Shungo; Miyakawa, Yuko; Matsumoto, Jun; Kajii, Yoshizumi.

In: Atmospheric Environment, Vol. 40, No. 40, 12.2006, p. 7869-7881.

Research output: Contribution to journalArticle

Yoshino, Ayako ; Sadanaga, Yasuhiro ; Watanabe, Keisuke ; Kato, Shungo ; Miyakawa, Yuko ; Matsumoto, Jun ; Kajii, Yoshizumi. / Measurement of total OH reactivity by laser-induced pump and probe technique-comprehensive observations in the urban atmosphere of Tokyo. In: Atmospheric Environment. 2006 ; Vol. 40, No. 40. pp. 7869-7881.
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