A review of the CAMx, CMAQ, WRF-Chem and NAQPMS models: Application, evaluation and uncertainty factors

Environmental Pollution, Journal Year: 2023, Volume and Issue: 343, P. 123183 - 123183

Published: Dec. 16, 2023

Language: Английский

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Inconsistent capacity of potential HONO sources to enhance secondary pollutants: evidence from WRF-Chem modeling

Journal of Environmental Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

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CAMx–UNIPAR simulation of secondary organic aerosol mass formed from multiphase reactions of hydrocarbons under the Central Valley urban atmospheres of California

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(1), P. 487 - 508

Published: Jan. 12, 2024

Abstract. The UNIfied Partitioning-Aerosol phase Reaction (UNIPAR) model was integrated into the Comprehensive Air quality Model with extensions (CAMx) to process secondary organic aerosol (SOA) formation by capturing multiphase reactions of hydrocarbons (HCs) in regional scales. SOA growth simulated using a wide range anthropogenic HCs, including 10 aromatics and linear alkanes different carbon lengths. atmospheric processes biogenic HCs (isoprene, terpenes, sesquiterpene) were for major oxidation paths (ozone, OH radicals, nitrate radicals) predict day night formation. UNIPAR streamlined partitioning lumping species originating from semi-explicitly predicted gas products their heterogeneous chemistry form non-volatile oligomeric both inorganic aqueous phase. CAMx–UNIPAR at four ground urban sites (San Jose, Sacramento, Fresno, Bakersfield) California, United States, during wintertime 2018. Overall, mass concentrations total matter, consisting primary SOA, showed good agreement observations. areas California predominated alkane terpene products. During daytime, low-volatility autoxidation long-chain considerably contributed mass. In contrast, significant amount nighttime produced reaction ozone or radicals. spatial distributions associated aromatic noticeably affected southward wind direction, owing relatively long lifetime oxidation, whereas those nearly insensitive direction. 2018, impact hygroscopicity on budget not evident because small contribution isoprene products, which are hydrophilic reactive However, an increased wet periods, although its little.

Language: Английский

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Secondary Organic Aerosol Formation from Volatile Chemical Product Emissions: Model Parameters and Contributions to Anthropogenic Aerosol

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(32), P. 11891 - 11902

Published: Aug. 1, 2023

Volatile chemical products (VCP) are an increasingly important source of hydrocarbon and oxygenated volatile organic compound (OVOC) emissions to the atmosphere, these likely play role as anthropogenic precursors for secondary aerosol (SOA). While SOA from VCP hydrocarbons is often accounted in models, formation, evolution, properties OVOCs remain uncertain. We use environmental chamber data a kinetic model develop parameters 10 representing glycols, glycol ethers, esters, aromatics, amines. Model simulations suggest that mass yields same magnitude widely studied (e.g., long-chain alkanes, monoterpenes, single-ring aromatics), exhibit linear correlation with carbon number precursor. When combined inventories two megacities United States (US) US-wide inventory, we find VOCs react OH form 0.8–2.5× much SOA, by mass, mobile sources. Hydrocarbons (terpenes, branched cyclic alkanes) (terpenoids, ethers) make up 60–75 25–40% arising use, respectively. This work contributes growing body knowledge focused on studying VOC contributions urban air pollution.

Language: Английский

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Source apportionment of organic gaseous and particulate compounds using a combined Positive Matrix Factorization approach in Summer 2020 in the Paris region (France)

Atmospheric Environment, Journal Year: 2025, Volume and Issue: 354, P. 121269 - 121269

Published: April 29, 2025

Language: Английский

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Implementation of a parallel reduction algorithm in the GENerator of reduced Organic Aerosol mechanisms (GENOA v2.0): Application to multiple monoterpene aerosol precursors

Journal of Aerosol Science, Journal Year: 2023, Volume and Issue: 174, P. 106248 - 106248

Published: Aug. 26, 2023

Explicit gas-phase chemical mechanisms represent the state of knowledge regarding chemistry volatile organic compounds (VOCs), which are crucial in formation secondary aerosols (SOAs). However, these computationally expensive, limits their practical use large-scale air quality modeling. Mechanism reduction is therefore required for computational efficiency while preserving accuracy detailed mechanisms. This paper presents a new version Generator Reduced Organic Aerosol Mechanisms (GENOA v2.0), reduces at size suitable three-dimensional (3-D) modeling simulating aerosol concentrations. GENOA v2.0 adopts parallel framework to identify most optimal reductions from competitive candidates, and can reduce multiple precursors. To demonstrate efficiency, applied monoterpene Master Chemical (MCM) combined with Peroxy Radical Autoxidation (PRAM) mechanism. The original mechanism, consisting 3 001 reactions 1 227 species (including 738 condensable species), reduced by 93% 197 110 23 inducing an average error only 3% Sensitivity tests showed that this mechanism behaved similarly response changes environmental conditions such as temperature, relative humidity, SOA mass loading. Moreover, if tolerance increased 20% — still be acceptable 3-D further simplified 40 24 5 species). Consequently, GENOA-generated preserves complexity on increasing makes it encountered atmosphere.

Language: Английский

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Investigation of Secondary Organic Aerosol Formation during O3 and PM2.5 Episodes in Bangkok, Thailand

Atmosphere, Journal Year: 2023, Volume and Issue: 14(6), P. 994 - 994

Published: June 7, 2023

In Bangkok, the megacity of Thailand, concentrations fine particulate matter (PM2.5) have often exceeded National Ambient Air Quality standards. During severe smog events over air quality has exhibited moderate to unhealthy atmospheric conditions, according index United States. To investigate formation secondary organic aerosols (SOA), a field campaign estimate carbon (SOC) in Bangkok using EC tracer method was conducted January 2021, when PM2.5 were high. The monthly period classified into three pollution groups, including high pollution, PM, and low events. study showed that correlations between O3 negative during both daytime night-time. OC/EC ratios varied from 4.32 5.43, while values implied fossil fuel combustion major carbonaceous aerosol Bangkok. tracer-estimated SOC POC contributed 32.5 46.4% OC, highest contribution occurred event. heightened SOA event perhaps owing levels oxides nitrogen (NOx). Since is more likely NOx-rich photochemical reaction regime, an increase NOx level tended decrease yield ([NOx] 21.6 ppb, 20.8 17.1 ppb events, respectively). Together with humidity light intensity event, enhanced. Even though driving factors remain unclear, results this reveal significance urgency local actions reduce towards habitable sustainable urban environments.

Language: Английский

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Dual roles of the inorganic aqueous phase on secondary organic aerosol growth from benzene and phenol

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(11), P. 6567 - 6582

Published: June 5, 2024

Abstract. Benzene, emitted from automobile exhaust and biomass burning, is ubiquitous in ambient air. Benzene a precursor hydrocarbon (HC) that forms secondary organic aerosol (SOA), but its SOA formation mechanism not well studied. To accurately predict the of benzene SOA, it important to understand gas mechanisms phenol, which one major products formed atmospheric oxidation benzene. Laboratory data presented herein highlight impact aqueous phase on generated through phenol oxidation. The roles consist (1) suppression aging (2) conventional acid-catalyzed reactions inorganic phase. explain this unusual effect, hypothesized persistent phenoxy radical (PPR) effectively via heterogeneous reaction phenol-related presence wet aerosol. These PPR species are capable catalytically consuming ozone during an NOx cycle negatively influencing growth. In study, explicit were derived produce oxygenated or Gas include existing Master Chemical Mechanism (MCM v3.3.1), path for peroxy adducts originating addition OH phenols forming low-volatility (e.g., multi-hydroxy aromatics), form production PPR. simulated classified into volatility- reactivity-based lumped incorporated Unified Partitioning Aerosol Reaction (UNIPAR) model predicts multiphase predictability UNIPAR was examined using chamber data, photooxidation under controlled experimental conditions (NOx levels, humidity, seed types). both still increased because oligomerization reactive However, simulations show significant ozone, benzene, growth compared with those without mechanisms. accelerated acidic weakens oxidation, up 53 % pathway connected reported mechanism. Thus, contribution less than phenol. Overall, related levels high-NOx region (HC ppbC / ppb < 5). simulation indicates significance rises decreasing levels. Hence, influence complex varying temperature type conditions. Adding comprehensive phenolic compounds will improve prediction aromatic HCs due missing current air quality model.

Language: Английский

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Properties and Atmospheric Oxidation of Terebic Acid Aerosol

ACS Earth and Space Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 21, 2024

Language: Английский

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Dual roles of inorganic aqueous phase on SOA growth from benzene and phenol

Published: Nov. 7, 2023

Abstract. Benzene, emitted from automobile exhaust and biomass burning, is ubiquitous in ambient air. Benzene a precursor hydrocarbon (HC) that forms secondary organic aerosols (SOA), but its SOA formation mechanism not well studied. To accurately predict the of benzene SOA, it important to understand gas mechanisms phenol, which one major products formed atmospheric oxidation benzene. Our chamber study found wet-inorganic aerosol retarded or phenol benzene, thus their formation. explain this unusual effect, hypothesized persistent phenoxy radical (PPR) effectively via heterogeneous reaction phenol-related presence aerosol. These PPR species are capable catalytically consuming ozone during NOx cycle negatively influencing growth. In study, explicit were derived produce oxygenated Gas include existing Master Chemical Mechanism (MCM v3.3.1); path for peroxy adducts originating addition an OH phenols forming low-volatility (e.g., multi-hydroxy aromatics); form production PPR. The simulated classified into volatility-reactivity based lumping incorporated UNIfied Partitioning Aerosol Reaction (UNIPAR) model predicts multiphase reactions predictability UNIPAR was examined using data, generated photooxidation under various experimental conditions (NOx levels, humidity, inorganic seed types). both still increased wet because oligomerization reactive aqueous phase. However, simulations show significant suppression ozone, growth, compared those without mechanisms. addition, accelerated acidic weakens oxidation, about 53 % pathway connected reported mechanism. Thus, contribution less than phenol. Overall, growth related levels high region (HC ppbC/NOx ppb <5). simulation indicates significance rises with decreasing levels. Hence, influence on complex varying temperature types.

Language: Английский

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