Multiphase Reactions of Hydrocarbons Into an Air Quality Model With CAMx‐UNIPAR: Impacts of Humidity and NOx on Secondary Organic Aerosol Formation in the Southern USA DOI Creative Commons
Yu‐Jin Jo, Myoseon Jang, Azad Madhu

et al.

Journal of Advances in Modeling Earth Systems, Journal Year: 2024, Volume and Issue: 16(10)

Published: Oct. 1, 2024

Abstract Secondary organic aerosol (SOA) mass in the Southern USA during winter‐spring 2022 was simulated by integrating Comprehensive Air quality Model with extensions (CAMx) UNIfied Partitioning‐Aerosol phase Reaction (UNIPAR) model, which predicts SOA formation via multiphase reactions of hydrocarbons. UNIPAR streamlines partitioning oxygenated products and their heterogeneous using explicitly predicted originating from 10 aromatics, 3 biogenics, linear/branched alkanes (C9‐C24). simulations were compared those Organic Aerosol Partitioning (SOAP) uses simple surrogate for each precursor. Both SOAP showed similar tendencies but slightly underpredicted against observations at given five ground sites. However, compositions sensitivity to environmental variables (sunlight, humidity, NO x , SO 2 ) different between two models. In CAMx‐UNIPAR, originated predominantly alkanes, terpenes, isoprene, influenced showing high concentrations wet‐inorganic salts, accelerated aqueous reactive products. positively correlated biogenic because elevated levels nitrate radicals hygroscopic effectively oxidized hydrocarbons night promoted growth chemistry, respectively. Anthropogenic SOA, formed mainly daytime oxidation OH radicals, weakly negatively cities. acidity (neutral vs. acidic cation/anion = 0.62) dominated isoprene SOA. The reduction emissions could mitigate burdens where are abundant.

Language: Английский

Multiphase reactions of hydrocarbons into an air quality model with CAMx-UNIPAR: Impacts of humidity and NOx on secondary organic aerosol formation in the Southern USA DOI Open Access
Y.J. Jo, Myoseon Jang, Azad Madhu

et al.

Authorea (Authorea), Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 26, 2024

Secondary organic aerosol (SOA) mass in the Southern USA during winter-spring 2022 were simulated by integrating Comprehensive Air quality Model with extensions (CAMx) UNIfied Partitioning-Aerosol phase Reaction (UNIPAR) model, which predicts SOA formation via multiphase reactions of hydrocarbons. UNIPAR streamlines partitioning oxygenated products and their heterogeneous using explicitly predicted originating from 10 aromatics, 3 biogenics, linear/branched alkanes different carbon lengths. simulations compared those partitioning-based model (SOAP), uses simple surrogate for each precursor. Both SOAP showed similar tendencies but slightly underpredicted against observations at given five ground sites. However, compositions its sensitivity to environmental variables (sunlight, humidity, NOx, SO2) between two models. In CAMx-UNIPAR, was predominated alkane, terpene, isoprene, notably influenced humidities showing high concentrations wet-inorganic salts, accelerated aqueous reactive products. NO2 positively correlated biogenic because elevated nitrate radicals effectively oxidized hydrocarbons night increased hygroscopic promoted growth chemistry. Anthropogenic SOA, formed mainly daytime oxidation OH radicals, weakly negatively cities. acidity (neutral vs. acidic cation/anion = 0.62) dominated isoprene SOA. The decline NOx emission benefits mitigation burdens where are abundant.

Language: Английский

Citations

0
Multiphase Reactions of Hydrocarbons Into an Air Quality Model With CAMx‐UNIPAR: Impacts of Humidity and NOx on Secondary Organic Aerosol Formation in the Southern USA DOI Creative Commons
Yu‐Jin Jo, Myoseon Jang, Azad Madhu

et al.

Journal of Advances in Modeling Earth Systems, Journal Year: 2024, Volume and Issue: 16(10)

Published: Oct. 1, 2024

Abstract Secondary organic aerosol (SOA) mass in the Southern USA during winter‐spring 2022 was simulated by integrating Comprehensive Air quality Model with extensions (CAMx) UNIfied Partitioning‐Aerosol phase Reaction (UNIPAR) model, which predicts SOA formation via multiphase reactions of hydrocarbons. UNIPAR streamlines partitioning oxygenated products and their heterogeneous using explicitly predicted originating from 10 aromatics, 3 biogenics, linear/branched alkanes (C9‐C24). simulations were compared those Organic Aerosol Partitioning (SOAP) uses simple surrogate for each precursor. Both SOAP showed similar tendencies but slightly underpredicted against observations at given five ground sites. However, compositions sensitivity to environmental variables (sunlight, humidity, NO x , SO 2 ) different between two models. In CAMx‐UNIPAR, originated predominantly alkanes, terpenes, isoprene, influenced showing high concentrations wet‐inorganic salts, accelerated aqueous reactive products. positively correlated biogenic because elevated levels nitrate radicals hygroscopic effectively oxidized hydrocarbons night promoted growth chemistry, respectively. Anthropogenic SOA, formed mainly daytime oxidation OH radicals, weakly negatively cities. acidity (neutral vs. acidic cation/anion = 0.62) dominated isoprene SOA. The reduction emissions could mitigate burdens where are abundant.

Language: Английский

Citations

0