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| Titel |
Impacts of daytime nitrous acid source on O3 budget and concentrations of O3 and major aerosol components in the coastal regions of China |
| VerfasserIn |
Yu Jia Tang, Bao xian Liu, Yun Ting Li, Qin Wang, Da Wei Zhang, Meng Zhang, Hui Du |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147012
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| Publikation (Nr.) |
 EGU/EGU2017-11096.pdf |
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| Zusammenfassung |
| 37 field experiment data from 13 different field campaigns across the globe are used to express the unknown daytime HONO source (Punknown) as a function of NO2 mixing ratios and J(NO2): . Then the Punknown is added into the WRF-Chem model. Elevated daytime-mean Punknown values are found in the coastal regions of China, reaching 2.5 ppb h−1 in the Beijing-Tianjin-Heibei region, 2.0 ppb h−1 in the Yangtze River delta region, and 1.2 ppb h−1 in the Pearl River delta region. When the Punknown, HONO emissions and nighttime hydrolysis conversion of NO2 on aerosols are considered, daytime HONO is produced primarily via Punknown and the reaction of OH and NO, whereas, nighttime HONO is produced primarily via the nighttime hydrolysis conversion of NO2 on aerosols.
Impacts of Punknown on O3 and major inorganic aerosols are evaluated in this study. Simulation results show that O3 budget and monthly/hourly mean concentrations of O3、NO3-、NH4+ and SO42- in the coastal regions of China are significantly increased when the Punknown is considered. Monthly daytime-mean of O3 production rates and loss rates are respectively increased by 0.80~2.95 ppb h−1 (30~115%) and 0.03~0.21 ppb h−1 (8~32%); monthly averaged daily maximum 8-h O3 concentrations is increased by 1.90~7.24 ppb (2~10%); daily maximum 1-h surface O3 concentrations is increased by 9.00~35.00 ppb in major cities; monthly mean concentrations of NO3-、NH4+ and SO42- are increased by 0.01~5.64 μg m-3 (1~23%)、0.14~1.28 μg m-3 (2~20%) and 0.72~2.54 μg m-3 (9~22%), respectively, in the coastal regions of China. |
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