Atmospheric Environment, Journal Year: 2024, Volume and Issue: 338, P. 120868 - 120868
Published: Oct. 11, 2024
Language: Английский
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
Published: Jan. 29, 2024
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
Citations
0
Published: March 6, 2024
Abstract. Biogenic volatile organic compounds (BVOCs) are the largest source of secondary aerosols (SOA) globally. However, complex interactions between marine and terrestrial BVOCs remain unclear, inhibiting our in-depth understanding SOA formation in coastal areas its environmental impacts. Here, we performed smog chamber experiments with mixed α-pinene (a typical monoterpene) dimethyl sulfide (DMS, a emission BVOC) to investigate their possible subsequent formation. It is found that DMS has non-linear effect on generation: mass concentration yield show an increasing then decreasing trend increase initial DMS. The can be attributed OH regeneration together acid-catalyzed heterogeneous reactions by oxidation DMS, while explained high reactivity inhibits low volatility products. results from infrared spectra reveal contribution sulfur-containing molecules system. Moreover, indicate acidic products generated photooxidation enhance O:C ratio, organosulfates produced contribute SOA. In addition, trends relative abundance highly oxygenated (HOMs) C8-C10 multiple functional groups different systems agree well turning point yield. findings this study have significant implications for binary or more atmosphere areas.
Language: Английский
Citations
0
Published: March 8, 2024
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
Citations
0
Published: March 8, 2024
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
Citations
0
Published: March 8, 2024
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
Citations
0
Published: March 8, 2024
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
Citations
0
Published: April 8, 2024
Abstract. Biogenic volatile organic compounds (BVOCs) are the largest source of secondary aerosols (SOA) globally. However, complex interactions between marine and terrestrial BVOCs remain unclear, inhibiting our in-depth understanding SOA formation in coastal areas its environmental impacts. Here, we performed smog chamber experiments with mixed α-pinene (a typical monoterpene) dimethyl sulfide (DMS, a emission BVOC) to investigate their possible subsequent formation. It is found that DMS has non-linear effect on generation: mass concentration yield show an increasing then decreasing trend increase initial DMS. The can be attributed OH regeneration together acid-catalyzed heterogeneous reactions by oxidation DMS, while explained high reactivity inhibits low volatility products. results from infrared spectra reveal contribution sulfur-containing molecules system. Moreover, indicate acidic products generated photooxidation enhance O:C ratio, organosulfates produced contribute SOA. In addition, trends relative abundance highly oxygenated (HOMs) C8-C10 multiple functional groups different systems agree well turning point yield. findings this study have significant implications for binary or more atmosphere areas.
Language: Английский
Citations
0
Published: April 9, 2024
Abstract. Biogenic volatile organic compounds (BVOCs) are the largest source of secondary aerosols (SOA) globally. However, complex interactions between marine and terrestrial BVOCs remain unclear, inhibiting our in-depth understanding SOA formation in coastal areas its environmental impacts. Here, we performed smog chamber experiments with mixed α-pinene (a typical monoterpene) dimethyl sulfide (DMS, a emission BVOC) to investigate their possible subsequent formation. It is found that DMS has non-linear effect on generation: mass concentration yield show an increasing then decreasing trend increase initial DMS. The can be attributed OH regeneration together acid-catalyzed heterogeneous reactions by oxidation DMS, while explained high reactivity inhibits low volatility products. results from infrared spectra reveal contribution sulfur-containing molecules system. Moreover, indicate acidic products generated photooxidation enhance O:C ratio, organosulfates produced contribute SOA. In addition, trends relative abundance highly oxygenated (HOMs) C8-C10 multiple functional groups different systems agree well turning point yield. findings this study have significant implications for binary or more atmosphere areas.
Language: Английский
Citations
0
Current Applied Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. e0260120 - e0260120
Published: May 1, 2024
Cimate change affects the emission of biogenic volatile organic compounds (BVOCs) from plants, especially isoprene, α-pinene, and β-pinene. These play vital role in secondary aerosol potential (SOAP) ozone formation (OFP) through photochemical reactions. In Thailand, daytime temperatures typically reach up to 40°C resulting plant stress. The considered Peltophorum pterocarpum, emits high levels BVOCs is widely cultivated urban areas Bangkok. Consequently, this research aimed study variations BVOC concentration, SOAP, OFP associated with during daytime. (isoprene, α – pinene, β pinene) were sampled using a dynamic enclosure system 9:00 11:00 local time analyzed gas chromatography flame ionization detector. SOAP estimated fractional coefficient maximum incremental reactivity. results revealed an average concentration 4.68 μg/m3, which depended on temperature light intensity. highest 1,367.10 188.58 respectively, largely influenced by piene. This aids understanding pollutant involving emitted trees areas, can lead selection low BVOC-emitting tree species improvement guidelines for planning forest areas.
Language: Английский
Citations
0