TY - JOUR
T1 - Measurement of total OH reactivity by laser-induced pump and probe technique-comprehensive observations in the urban atmosphere of Tokyo
AU - Yoshino, Ayako
AU - Sadanaga, Yasuhiro
AU - Watanabe, Keisuke
AU - Kato, Shungo
AU - Miyakawa, Yuko
AU - Matsumoto, Jun
AU - Kajii, Yoshizumi
N1 - Funding Information:
This work was financially supported by the Core Research for Evolution Science and Technology (CREST) of the Japan Society and Technology Corporation and by the Ministry of Education, Science, Sports, and Culture of Japan (Grant-in-Aid No. 15201004). We also thank our colleagues who measured the species and processed the data during the observations at the Tokyo Metropolitan University.
PY - 2006/12
Y1 - 2006/12
N2 - 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.
AB - 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.
KW - Laser-induced pump and probe technique
KW - Total OH reactivity
KW - Urban air quality
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U2 - 10.1016/j.atmosenv.2006.07.023
DO - 10.1016/j.atmosenv.2006.07.023
M3 - Article
AN - SCOPUS:33750975625
VL - 40
SP - 7869
EP - 7881
JO - Atmospheric Environment
JF - Atmospheric Environment
SN - 1352-2310
IS - 40
ER -
