Comment on egusphere-2023-1355 DOI Creative Commons
Alexandre Albinet

Опубликована: Сен. 26, 2023

Abstract. Secondary organic aerosols (SOA) formed by oxidation of typical precursors largely emitted biomass burning, such as PAHs and furans, are still poorly characterized in terms formation yields, physical light absorption properties, particularly those generated at night following reaction with nitrate radicals (NO3). In the present study, we evaluated compared effective density (ρeff), Ångström exponent (α), mass coefficient (MAC) laboratory-generated SOA from three furan compounds (furan, 2-methylfuran, 2,5-dimethylfuran) four (naphthalene, acenaphthylene, fluorene, phenanthrene). were an flow reactor between hydroxyl (OH; 0.1–20 equivalent aging days) or NO3 (0.05–6 nights 14 h) single PAH. The ρeff, α, MAC varied depending on precursor oxidant considered. ρeff OH tended to increase particle size before reaching a “plateau”. This was evident for nighttime chemistry experiments (1.2 1.6 average particles > 100 nm). Such results highlighted potential differences chemical composition SOA, well probably their morphology, according size. Three times lower yields obtained OH. PAH (18 76 %) 5 6 higher than furans (3–12 %). While showed low negligible found have significant impact UV-Visible region, implying contribution atmospheric brown carbon (BrC). No values observed processes, due nitrogen-containing chromophores through homogeneous gas phase processes only (without NOx). Overall, this work demonstrated that both, day- substantial aerosol properties so climate.

Язык: Английский

Enhanced Light Absorption and Elevated Viscosity of Atmospheric Brown Carbon through Evaporation of Volatile Components DOI
Diego Calderon‐Arrieta, Ana C. Morales, Anusha P. S. Hettiyadura

и другие.

Environmental Science & Technology, Год журнала: 2024, Номер 58(17), С. 7493 - 7504

Опубликована: Апрель 18, 2024

Samples of brown carbon (BrC) material were collected from smoke emissions originating wood pyrolysis experiments, serving as a proxy for BrC representative biomass burning emissions. The acquired samples, referred to "pyrolysis oil (PO

Язык: Английский

Процитировано

10
Relative Humidity Modulates the Physicochemical Processing of Secondary Brown Carbon Formation from Nighttime Oxidation of Furan and Pyrrole DOI Creative Commons
Kunpeng Chen, Caitlin Hamilton,

B. Ries

и другие.

ACS ES&T Air, Год журнала: 2024, Номер 1(5), С. 426 - 437

Опубликована: Апрель 9, 2024

Light-absorbing secondary organic aerosols (SOAs), also known as brown carbon (BrC), are major components of wildfire smoke that can have a significant impact on the climate system; however, how environmental factors such relative humidity (RH) influence their formation is not fully understood, especially for heterocyclic precursors. We conducted chamber experiments to investigate BrC from nighttime oxidation furan and pyrrole, two primary precursors in wildfires, presence pre-existing particles at RH < 20% ∼ 50%. Our findings revealed increasing significantly affected size distribution dynamics both SOAs, with pyrrole SOA showing stronger potential generate ultrafine via intensive nucleation processes. Higher led increased mass fractions oxygenated compounds suggesting enhanced gas-phase and/or multiphase under humid conditions. Moreover, higher reduced absorption coefficients BrC, contrasting those homocyclic precursors, due non-absorbing high-molecular-weight decreasing molecular chromophores. Overall, our demonstrate unique dependence which may critically modulate radiative effects change.

Язык: Английский

Процитировано

7
The Influence of Heterogeneous Processes on the Physicochemical Properties of Atmospheric Aerosols DOI Creative Commons
Maofa Ge, Shengrui Tong, Lin Du

и другие.

Advances in Atmospheric Sciences, Год журнала: 2025, Номер unknown

Опубликована: Янв. 22, 2025

Язык: Английский

Процитировано

1
Predictions of the Optical Properties of Brown Carbon Aerosol by Machine Learning with Typical Chromophores DOI
Ying Wang, Ru‐Jin Huang, Haobin Zhong

и другие.

Environmental Science & Technology, Год журнала: 2024, Номер 58(46), С. 20588 - 20597

Опубликована: Ноя. 7, 2024

The linkages between BrC optical properties and chemical composition remain inadequately understood, with quantified chromophores explaining less than 25% of ambient aerosol light absorption. This study characterized 38 typical in aerosols collected Xi'an, absorption contributions to ranging from 1.6 ± 0.3 5.8 2.6% at 365 nm. Based on these chromophores, an interpretable machine learning model the Shapley Additive Explanation (SHAP) method were employed explore relationships composition. attained high accuracy Pearson correlation coefficients (

Язык: Английский

Процитировано

4
Atmospheric oxidation of 1,3-butadiene: influence of seed aerosol acidity and relative humidity on SOA composition and the production of air toxic compounds DOI Creative Commons
Mohammed Jaoui, Klara Nestorowicz, Krzysztof J. Rudziński

и другие.

Atmospheric chemistry and physics, Год журнала: 2025, Номер 25(2), С. 1401 - 1432

Опубликована: Янв. 31, 2025

Abstract. This study investigated the effect of relative humidity (RH) on chemical composition gas and particle phases formed from photooxidation 1,3-butadiene (13BD) in presence NOx under acidified non-acidified seed aerosol. The experiments were conducted a 14.5 m3 smog chamber operated steady-state mode. Products identified by high-performance liquid chromatography, chromatography–mass spectrometry, ultrahigh-performance chromatography coupled with high-resolution mass spectrometry. More than 50 oxygenated products identified, including 33 organics, 10 organosulfates (OSs), PAN, APAN, glyoxal, formaldehyde, acrolein. Secondary organic aerosol (SOA) reaction depended RH acidity Based Extended Aerosol Inorganics Model (E-AIM), originated solutions was found to exist aqueous solid phases, respectively. Although terms “acidified” “non-acidified” are true for which seeds atomized, there far more fundamental differences between phase states species partition or (aqueous/solid), considerably affects their partitioning formation mechanisms. SOA most (i) higher conditions, where particles deliquescent, did not contain any phase; (ii) increased conditions; (iii) decreased increasing RH. Glyceric acid, threitols, threonic acids, four dimers, three unknowns, among main measured either conditions across all levels. Total secondary carbon yield both conditions. photochemical reactivity 13BD our systems faster To determine contribution ambient aerosol, we analyzed PM2.5 samples collected at European monitoring stations located Poland. occurrence several (e.g., glyceric tartronic tartaric OSs) field suggests that could contribute formation.

Язык: Английский

Процитировано

0
Insights into secondary organic aerosol formation from the day- and nighttime oxidation of polycyclic aromatic hydrocarbons and furans in an oxidation flow reactor DOI Creative Commons
Abd El Rahman El Mais, Barbara D’Anna, Luka Drinovec

и другие.

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(23), С. 15077 - 15096

Опубликована: Дек. 7, 2023

Abstract. Secondary organic aerosols (SOAs) formed by oxidation of typical precursors largely emitted biomass burning, such as polycyclic aromatic hydrocarbons (PAHs) and furans, are still poorly characterized. We evaluated compared the formation yields, effective density (ρeff), absorption Ångström exponent (α), mass coefficient (MAC) laboratory-generated SOAs from three furan compounds four PAHs. were generated in an flow reactor under day- (OH radicals) or nighttime (NO3 conditions. The ρeff, α, MAC varied depending on precursor oxidant considered. ρeff with OH NO3 tended to increase particle size before reaching a “plateau”, highlighting potential differences SOA chemical composition and/or morphology, according size. Three times lower yields obtained OH. PAH (18 %–76 %) five six higher than those for furans (3 %–12 %). While showed low negligible light properties, had significant impact UV–visible region, implying contribution atmospheric brown carbon. No values was observed processes, probably due nitrogen-containing chromophores only (without NOx). results demonstrated that PAHs through both, have substantial aerosol properties.

Язык: Английский

Процитировано

8
Light Absorption Properties of Brown Carbon Aerosol During Winter at a Polluted Rural Site in the North China Plain DOI Creative Commons

Yanan Tao,

Zheng Yang,

Xinyu Tan

и другие.

Atmosphere, Год журнала: 2024, Номер 15(11), С. 1294 - 1294

Опубликована: Окт. 28, 2024

Brown carbon aerosols (BrC), a subfraction of organic aerosols, significantly influence the atmospheric environment, climate and human health. The North China Plain (NCP) is hotspot for BrC research in China, yet our understanding optical properties rural regions still very limited. In this study, we characterize chemical components light absorption at site during winter NCP. average mass concentration PM1 135.1 ± 82.3 μg/m3; organics nitrate are main PM1. coefficient (babs,BrC) 53.6 45.7 Mm−1, accounting 39.5 10.2% total 370 nm. Diurnal variations reveal that babs,BrC lower afternoon, attributed to evolution planetary boundary layers. mainly emitted locally, both aqueous phase photooxidation reactions can increase babs,BrC. Notably, reduced when RH > 65%. During foggy conditions, facilitate formation secondary contribute bleaching BrC. This process ultimately causes decrease Ångström exponent (AAE) efficiency (MAE). contrast, babs,BrC, along with AAE MAE, rise due substantial primary emissions. study enhances polluted

Язык: Английский

Процитировано

1
Simulation of Secondary Organic Aerosol Formation Using Near-Explicitly Predicted Products from Naphthalene Photooxidation in the Presence of NOx DOI
Sanghee Han, Myoseon Jang

ACS Earth and Space Chemistry, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 16, 2024

The atmospheric oxidation of naphthalene, found in automobile exhaust and biomass burning smoke, forms a secondary organic aerosol (SOA) with high yield. In this study, near-explicit gas mechanism for the photooxidation naphthalene presence NOx was derived using box model platform. initiated by an OH radical produces various products, including naphthols, nitronaphthols, naphthoquinones, ring-opening organonitrates. resulting applied to UNIfied Partitioning Aerosol-phase Reaction (UNIPAR) predict SOA formation via multiphase reactions naphthalene. Semiexplicitly predicted products were sorted construct volatility-reactivity-based two-dimensional (2D) lumping species, which used process partitioning organics their heterogeneous chemistry form SOA. performance demonstrated data obtained from under varying conditions (NOx levels, humidity, temperature, seed types) large outdoor photochemical smog chamber. Major mechanisms compared tentatively identified proton transfer reaction-mass spectrometry. simulated organic-to-carbon ratio (0.72) functional groups (0.70 ± 0.7) constructed analysis chamber-generated Fourier transform infrared Among environmental variables, temperature are influential formation. A strong negative relationship appeared between levels hydrocarbon (HC)-limited regions (HC ppbC/NOx ppb <5) but weakly positive at NOx-limited regions. impact aqueous on growth insignificant regardless inorganic types (inorganic liquid water content acidity) due poor solubility phase. Under is dominated organic-phase reactive, low-volatile multifunctional aldehydes. Both are, however,

Язык: Английский

Процитировано

1
Supplementary material to "Insights into secondary organic aerosol formation from the day- and nighttime oxidation of PAHs and furans in an oxidation flow reactor" DOI Open Access
Abd El Rahman El Mais, Barbara D’Anna, Luka Drinovec

и другие.

Опубликована: Июль 4, 2023

Язык: Английский

Процитировано

1
Insights into secondary organic aerosol formation from the day- and nighttime oxidation of PAHs and furans in an oxidation flow reactor DOI Creative Commons
Abd El Rahman El Mais, Barbara D’Anna, Luka Drinovec

и другие.

Опубликована: Июль 4, 2023

Abstract. Secondary organic aerosols (SOA) formed by oxidation of typical precursors largely emitted biomass burning, such as PAHs and furans, are still poorly characterized in terms formation yields, physical light absorption properties, particularly those generated at night following reaction with nitrate radicals (NO3). In the present study, we evaluated compared effective density (ρeff), Ångström exponent (α), mass coefficient (MAC) laboratory-generated SOA from three furan compounds (furan, 2-methylfuran, 2,5-dimethylfuran) four (naphthalene, acenaphthylene, fluorene, phenanthrene). were an flow reactor between hydroxyl (OH; 0.1–20 equivalent aging days) or NO3 (0.05–6 nights 14 h) single PAH. The ρeff, α, MAC varied depending on precursor oxidant considered. ρeff OH tended to increase particle size before reaching a “plateau”. This was evident for nighttime chemistry experiments (1.2 1.6 average particles > 100 nm). Such results highlighted potential differences chemical composition SOA, well probably their morphology, according size. Three times lower yields obtained OH. PAH (18 76 %) 5 6 higher than furans (3–12 %). While showed low negligible found have significant impact UV-Visible region, implying contribution atmospheric brown carbon (BrC). No values observed processes, due nitrogen-containing chromophores through homogeneous gas phase processes only (without NOx). Overall, this work demonstrated that both, day- substantial aerosol properties so climate.

Язык: Английский

Процитировано

1