HONO Measurement in Seoul during Summer 2018 and its Impact on Photochemistry

Junsu Gil, Jeewon Son, Sunggu Kang, Joonhyoung Park, Meehye Lee, Eunmi Jeon, Mihee Shim

Research output: Contribution to journalArticlepeer-review

Abstract

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 O3 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(O3, NO, and NO2). The collection effciency of PPDS was estimated as 91.8~99.9% 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-O3 episode than non-episode. Likewise, the OH production from HONO photolysis was higher by 0.04 pptv sec-1 in high-O3 episodes, when the daily maximum O3 exceeded 100 ppbv, than non-episode. The hourly maximum O3 reached 170 ppbv under severe heat waves. When the diurnal variations of O3 was simulated with the measured HONO using the Framework for 0-D Atmospheric Modelling (F0AM), the daily maximum O3 changed by 8~17 ppbv according to the HONO and VOC levels. In particular, the daily maximum O3 was increased under non-episode conditions with an increased HONO, albeit low level.

Original languageEnglish
Pages (from-to)579-588
Number of pages10
JournalJournal of Korean Society for Atmospheric Environment
Volume36
Issue number5
DOIs
Publication statusPublished - 2020

Keywords

  • Difusion scrubber
  • F0AM
  • HONO
  • O formation
  • Photolysis

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Engineering
  • Pollution
  • Environmental Science (miscellaneous)

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