HONO Measurement in Seoul during Summer 2018 and its Impact on Photochemistry
- Authors
- Gil, Junsu; Son, Jeewon; Kang, Sunggu; Park, Joonhyoung; Lee, Meehye; Jeon, Eunmi; Shim, Mihee
- Issue Date
- 10월-2020
- Publisher
- KOREAN SOC ATMOSPHERIC ENVIRONMENT
- Keywords
- HONO; Photolysis; O-3 formation; Diffusion scrubber; F0AM
- Citation
- JOURNAL OF KOREAN SOCIETY FOR ATMOSPHERIC ENVIRONMENT, v.36, no.5, pp.579 - 588
- Indexed
- SCOPUS
KCI
- Journal Title
- JOURNAL OF KOREAN SOCIETY FOR ATMOSPHERIC ENVIRONMENT
- Volume
- 36
- Number
- 5
- Start Page
- 579
- End Page
- 588
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/53062
- DOI
- 10.5572/KOSAE.2020.36.5.579
- ISSN
- 1598-7132
- Abstract
- HONO photolysis is an early morning source of OH radicals in urban environment, which expedites the photooxidation of volatile organic compounds (VOC), leading to O-3 production. From July 14th to August 22nd 2018, HONO was measured at Korea University using a parallel plate diffusion scrubber coupled with Ion Chromatography (PPDS-IC), in conjunction with major reactive gases (O-3, NO, and NO2). The collection efficiency of PPDS was estimated as 91.8 similar to 99.9% from the side-by-side measurement. HONO mixing ratio ranged between 0.01 to 0.79 ppbv with a mean of 0.28 ppbv, which was higher in high-O-3 episode than non-episode. Likewise, the OH production from HONO photolysis was higher by 0.04 pptv sec(-1) in high-O-3 episodes, when the daily maximum O-3 exceeded 100 ppbv, than non-episode. The hourly maximum O-3 reached 170 ppbv under severe heat waves. When the diurnal variations of O-3 was simulated with the measured HONO using the Framework for 0-D Atmospheric Modelling (F0AM), the daily maximum O-3 changed by 8 similar to 17 ppbv according to the HONO and VOC levels. In particular, the daily maximum O-3 was increased under non-episode conditions with an increased HONO, albeit low level.
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