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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure
  • Atmospheric Composition and Structure: Chemical kinetic and photochemical properties
  • Atmospheric Composition and Structure: Pollution—urban and regional
  • Atmospheric Composition and Structure: Troposphere—composition and chemistry

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L08102, 4 PP., 2004
doi:10.1029/2004GL019661

The importance of NO2 and volatile organic compounds in the urban air from the viewpoint of the OH reactivity

Y. Sadanaga

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

A. Yoshino

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

S. Kato

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

A. Yoshioka

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

K. Watanabe

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

Y. Miyakawa

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

I. Hayashi

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

M. Ichikawa

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

J. Matsumoto

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

A. Nishiyama

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

N. Akiyama

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

Y. Kanaya

Atmospheric Composition Research Program, Frontier Research System for Global Change, Yokohama, Kanagawa, Japan

Y. Kajii

Department of Applied Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, Japan

Total OH reactivity was measured in the suburban area, Tokyo, in July and August 2003, by use of a laser-induced pump and probe technique. More than 90% of the measured data of the OH loss rates were higher than the calculated values with simultaneously measured concentrations of various trace species. The maximum difference between the measured and calculated values is 34.3%. However, this difference was reduced to be 24.6% when using the rate coefficient of the OH + NO2 reaction recommended by IUPAC 1997, which is 40% larger than the most recently recommended value (JPL 2002). We concluded that this disagreement is due to the uncertainty of the OH + NO2 rate coefficient as well as existence of unmeasured VOCs. VOCs were quantitatively important as contribution to the OH loss processes.

Received 6 February 2004; accepted 23 March 2004; published 17 April 2004.

Citation: Sadanaga, Y., et al. (2004), The importance of NO2 and volatile organic compounds in the urban air from the viewpoint of the OH reactivity, Geophys. Res. Lett., 31, L08102, doi:10.1029/2004GL019661.

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