2021~2022년 서울 도심에서 측정된 HONO의 변화 특성

• Published in: 한국대기환경학회지(국문) Vol. 39; no. 3; pp. 308 - 319
• Main Authors: 길준수(Junsu Gil), 이미혜(Meehye Lee), 이현민(Hyunmin Lee), 장지희(Jihi Jang)
• Format: Journal Article
• Language: Korean
• Published: 한국대기환경학회 01.06.2023
• Subjects: 대기과학; SUP> MARGA; 2.5< Nitrous acid (HONO); lt; ); PM< SUB> O; nitrate (NO₃< Heterogeneous reaction
• ISSN: 1598-7132; 2383-5346
• DOI: 10.5572/KOSAE.2023.39.3.308

HONO takes up a large amount of urban OH budget in the early morning through photolysis and is one of the major reactive nitrogen oxides (NOy) that finally contributes to the enhancement of daytime O3 and potentially PM2.5 nitrate (NO3 -). Therefore, it is important to figure out the distribution and characteristics of HONO to understand the formation mechanisms of O3 and NO3 - in urban areas. In this study, real-time HONO measurement was conducted in Seoul, South Korea from 2021 to 2022 using the MARGA (Monitor for AeRosol and Gases in Ambient air) system. During the whole measurement period, average concentration of HONO was 0.96 ppbv, and it was higher in the cold season when the NO2 concentration was high. Regardless of the season, HONO increased with an increase in NO2 and relative humidity, indicating that the HONO in Seoul was influenced by the heterogeneous formation. In addition, the impact of HONO on O3 was differed on the season, and HONO showed the possibility to contribute to the NO3 - during both daytime and nighttime via formation-loss process. KCI Citation Count: 1