scholarly journals Photochemical ozone production at a subtropical island of Okinawa, Japan: Implications from simultaneous observations of HO2radical and NOx

2002 ◽  
Vol 107 (D19) ◽  
Author(s):  
Yugo Kanaya
Keyword(s):  
Ozone Production ◽  
Photochemical Ozone

Unexpected Fast Monoterpene Oxidation In Eastern China

2021 ◽  
Author(s):  
Haichao Wang
Keyword(s):  
Eastern China ◽  
Field Measurements ◽  
Ozone Production ◽  
Nitrate Radical ◽  
Peroxy Radicals ◽  
Ozone Pollution ◽  
Volatile Organic ◽  
Secondary Aerosols ◽  
Photochemical Ozone

<p>Monoterpene plays an important role in the formation of secondary aerosols and ozone in the troposphere. However, the field characterization of monoterpene chemistry in ozone pollution is still very sparse. Here we report fast daytime oxidation of monoterpene by hydroxyl radical, nitrate radical and ozone based on field measurements in Eastern China. We find fast monoterpene oxidation produces peroxy radicals efficiently and enhances the photochemical ozone production largely with an additional 8.6 ppb of ozone production per day on average (14%), whose effect was even more important than that of isoprene chemistry in the analyzed dataset. We propose that the reduction of anthropogenic volatile organic compounds should be much more stringent in the presence of high monoterpenes to alleviating ozone pollution.</p>

scholarly journals Diagnosis of Photochemical Ozone Production Rates and Limiting Factors in Continental Outflow Air Masses Reaching Fukue Island, Japan: Ozone-Control Implications

2016 ◽  
Vol 16 (2) ◽  
pp. 430-441 ◽  
Author(s):  
Yugo Kanaya ◽  
Hiroshi Tanimoto ◽  
Yoko Yokouchi ◽  
Fumikazu Taketani Fumikazu Taketani ◽  
Yuichi Komazaki ◽  
...  
Keyword(s):  
Ozone Production ◽  
Limiting Factors ◽  
Production Rates ◽  
Air Masses ◽  
Ozone Control ◽  
Photochemical Ozone ◽  
Continental Outflow

scholarly journals Springtime photochemical ozone production observed in the upper troposphere over east Asia

2002 ◽  
Vol 108 (D3) ◽  
Author(s):  
Y. Miyazaki ◽  
K. Kita ◽  
Y. Kondo ◽  
M. Koike ◽  
M. Ko ◽  
...  
Keyword(s):  
East Asia ◽  
Ozone Production ◽  
Upper Troposphere ◽  
Photochemical Ozone

scholarly journals Impact of model resolution on chemical ozone formation in Mexico City: application of the WRF-Chem model

2010 ◽  
Vol 10 (18) ◽  
pp. 8983-8995 ◽  
Author(s):  
X. Tie ◽  
G. Brasseur ◽  
Z. Ying
Keyword(s):  
Mexico City ◽  
Urban Areas ◽  
Air Pollutants ◽  
Emission Inventory ◽  
Meteorological Conditions ◽  
Transport Processes ◽  
Ozone Production ◽  
Model Resolution ◽  
Coarse Resolution ◽  
Photochemical Ozone

Abstract. The resolution of regional chemical/dynamical models has important effects on the calculation of the distributions of air pollutants in urban areas. In this study, the sensitivity of air pollutants and photochemical ozone production to different model resolutions is assessed by applying a regional chemical/dynamical model (version 3 of Weather Research and Forecasting Chemical model – WRF-Chemv3) to the case of Mexico City. The model results with 3, 6, 12, and 24 km resolutions are compared to local surface measurements of CO, NOx, and O3. The study shows that the model resolutions of 3 and 6 km provide reasonable simulations of surface CO, NOx, and O3 concentrations and of diurnal variations. The model tends to underestimate the measurements when the resolution is reduced to 12 km or less. The calculated surface CO, NOx, and O3 concentrations at 24 km resolution are significantly lower than measured values. This study suggests that the ratio of the city size to the threshold resolution is 6 to 1, and that this ratio can be considered as a test value in other urban areas for model resolution setting. There are three major factors related to the effects of model resolution on the calculations of O3 and O3 precursors, including; (1) the calculated meteorological conditions, (2) the spatial distribution for the emissions of ozone precursors, and (3) the non-linearity in the photochemical ozone production. Model studies suggest that, for the calculations of O3 and O3 precursors, spatial resolutions (resulting from different meteorological condition and transport processes) have larger impacts than the effect of the resolution associated with emission inventories. The model shows that, with coarse resolution of emission inventory (24 km) and high resolution for meteorological conditions (6 km), the calculated CO and O3 are considerably improved compared to the results obtained with coarse resolution for both emission inventory and meteorological conditions (24 km). The resolution of the surface emissions has important effects on the calculated concentration fields, but the effects are smaller than those resulting from the model resolution. This study also suggests that the effect of model resolution on O3 precursors leads to important impacts on the photochemical formation of ozone. This results directly from the non-linear relationship between O3 formation and O3 precursor concentrations. Finally, this study suggests that, considering the balance between model performance and required computation time on current computers, the 6 km resolution is an optimal resolution for the calculation of ozone and its precursors in urban areas like Mexico City.

scholarly journals Photochemical ozone production in the rural southeastern United States during the 1990 Rural Oxidants in the Southern Environment (ROSE) program

1998 ◽  
Vol 103 (D17) ◽  
pp. 22491-22508 ◽  
Author(s):  
G. J. Frost ◽  
M. Trainer ◽  
G. Allwine ◽  
M. P. Buhr ◽  
J. G. Calvert ◽  
...  
Keyword(s):  
United States ◽  
Southeastern United States ◽  
Ozone Production ◽  
Photochemical Ozone

Photochemical ozone production in the Eastern Mediterranean

2006 ◽  
Vol 40 (17) ◽  
pp. 3057-3069 ◽  
Author(s):  
Evangelos Gerasopoulos ◽  
Giorgos Kouvarakis ◽  
Mihalis Vrekoussis ◽  
Christos Donoussis ◽  
Nikolaos Mihalopoulos ◽  
...  
Keyword(s):  
Eastern Mediterranean ◽  
Ozone Production ◽  
Photochemical Ozone
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