New System for Measuring the Photochemical Ozone Production Rate in the Atmosphere.
We have developed a new system for measuring photochemical ozone production rates in the atmosphere. Specifically, the system measures the net photochemical oxidant (Ox: the sum of ozone (O3) and nitrogen dioxide (NO2)) production rates (P-L(Ox)). Measuring Oxavoids issues from perturbations to the photostationary states between nitrogen oxides (NOx) and O3. This system has "reaction" and "reference" chambers. Ambient air is introduced into both chambers, and Oxis photochemically produced in the reaction chamber and not generated in the reference chamber. Air from the chambers is alternately introduced into an NO-reaction (NO: nitric oxide) tube to convert O3to NO2, and then the Oxconcentration is measured as NO2using a laser-induced fluorescence technique. P-L(Ox) was obtained by dividing the difference in Oxconcentrations between air samples from the two chambers by the mean residence time of the air in the reaction chamber. In this study, the P-L(Ox) measurement system was characterized, and the current detection limit of P-L(Ox) was determined to be 0.54 ppbv h-1with an integration time of 60 s (S/N = 2), assuming an ambient Oxconcentration of 100 ppbv. Field measurements of P-L(Ox) were conducted using the system at a remote forest location.
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
Yasuhiro
0000-0002-4993-8652
Y
Sadanaga
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
Shio
S
Kawasaki
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
Yuki
Y
Tanaka
Graduate School of Global Environmental Studies, Kyoto University , Yoshida-Nihonmatsu-cho, Sakyo-ku, Kyoto, Kyoto 606-8316, Japan.|National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
Yoshizumi
Y
Kajii
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
Hiroshi
H
Bandow
D000393:Air Pollutants; D001272:Atmosphere / Q000737:chemistry; D004784:Environmental Monitoring; D009585:Nitrogen Dioxide; D010126:Ozone / Q000737:chemistry*
D000393:Air Pollutants; D010126:Ozone; D009585:Nitrogen Dioxide