Evaluation of simulated O3 production efficiency during the Korus-AQ campaign

Implications for anthropogenic NOx emissions in Korea

Dados Bibliográficos

ID19568682
AutoresYujin J Oak (0000-0003-4719-8790, Seoul National University), Rokjin J Park (0000-0001-8922-0234, Seoul National University), J Schroeder (0000-0001-7395-4962, California Air Resources Board), Jason R Schroeder, J H Crawford (0000-0002-6982-0934, Langley Research Center), D R Blake (0000-0002-8283-5014, University of California, Irvine), A J Weinheimer (0000-0001-6175-8286, NSF National Center for Atmospheric Research), Jung-Hun Woo, Jung‐Hun Woo (0000-0002-2515-8467, Konkuk University), Sang‐Woo Kim (0000-0002-0079-5806, Seoul National University), Sang-Woo Kim (0000-0002-6963-9393), Huidong Yeo (Seoul National University), Amy Fried (0000-0002-5230-3527, Institute of Arctic and Alpine Research), Alan Fried, Armin Wisthaler (0000-0001-5050-3018, University of Oslo), W H Brune (0000-0002-1609-4051, Pennsylvania State University)
EditoresDetlev Helmig (0000-0003-1612-1651), Jochen Stutz
Ano2019
Volume7
Data de publicação2019-01-01
Open AccessSim
TipoARTICLE
PeriódicoElementa Science of the Anthropocene (JOURNAL)
Identificadores do periódicoISSN: 2325-1026 • E-ISSN: 2325-1026
EditoraUniversity of California Press (PUBLISHER • US)
DOI10.1525/elementa.394
OpenAlexW2997183796
IdiomaEN
Citações recebidas7
Referências citadas57

We examine O3 production and its sensitivity to precursor gases and boundary layer mixing in Korea by using a 3-D global chemistry transport model and extensive observations during the KORea-US cooperative Air Quality field study in Korea, which occurred in May–June 2016. During the campaign, observed aromatic species onboard the NASA DC-8 aircraft, especially toluene, showed high mixing ratios of up to 10 ppbv, emphasizing the importance of aromatic chemistry in O3 production. To examine the role of VOCs and NOx in O3 chemistry, we first implement a detailed aromatic chemistry scheme in the model, which reduces the normalized mean bias of simulated O3 mixing ratios from –26% to –13%. Aromatic chemistry also increases the average net O3 production in Korea by 37%. Corrections of daytime PBL heights, which are overestimated in the model compared to lidar observations, increase the net O3 production rate by ~10%. In addition, increasing NOx emissions by 50% in the model shows best performance in reproducing O3 production characteristics, which implies that NOx emissions are underestimated in the current emissions inventory. Sensitivity tests show that a 30% decrease in anthropogenic NOx emissions in Korea increases the O3 production efficiency throughout the country, making rural regions ~2 times more efficient in producing O3 per NOx consumed. Simulated O3 levels overall decrease in the peninsula except for urban and other industrial areas, with the largest increase (~6 ppbv) in the Seoul Metropolitan Area (SMA). However, with simultaneous reductions in both NOx and VOCs emissions by 30%, O3 decreases in most of the country, including the SMA. This implies the importance of concurrent emission reductions for both NOx and VOCs in order to effectively reduce O3 levels in Korea

Air quality index · Atmospheric chemistry · Atmospheric sciences · Combustion · Geography · Meteorology · Metropolitan area · Mixing ratio · NOx · Ozone · Physics · Air Quality and Health Impacts · Atmospheric chemistry and aerosols · Chemistry · Environmental Science · Vehicle emissions and performance · Environmental Engineering

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