Simulation of the Steady Mixing State of Black Carbon With a Two‐Dimensional Sectional Model DOI Creative Commons
Qichang Lin, Jiandong Wang, Chenxi Li

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(23)

Published: Dec. 9, 2024

Abstract Black carbon (BC) strongly absorbs solar radiation and has a warming effect on the earth‐atmosphere system. BC experiences continuous aging, making its optical properties great uncertainty due to complex mixing state. To address this issue, we developed sectional model which is capable of tracking both aerosol size core size. This was applied simulate aging process. The atmospheric observational data from slightly polluted case employed drive model. It shown that BC's characteristics tend reach steady state within 12 hr. Our analysis reveals that, in state, distribution BC‐containing particles demonstrates notable characteristic: particle decreases exponentially as increases. exponential relationship provides simplified yet accurate representation steady‐state validated across diverse conditions.

Language: Английский

Seasonal distributions and possible sources of low molecular weight organic acids in PM2.5 from a typical mining city after decade green mining developing in Southeastern Hubei, Central China DOI
Shan Liu, Kimitaka Kawamura, Bhagawati Kunwar

et al.

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 325, P. 120455 - 120455

Published: March 11, 2024

Language: Английский

Citations

5
Gaseous Sulfuric Acid Contributions to Sulfate Formation in Urban Atmosphere DOI
Zhenning Wang, Wei Nie, Yuliang Liu

et al.

Environmental Science & Technology Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

Sulfate aerosols are critical atmospheric constituents, influencing air quality and climate. Their complex formation processes have been studied predominantly in the context of multiphase chemistry. However, substantial contribution gas-phase condensation sulfuric acid (SAcond) to sulfate aerosol has not fully recognized, primarily due challenges associated with long-term measurement gaseous (H2SO4). Using comprehensive data set from SORPES station, we elucidated influence H2SO4 on generation across different meteorological pollution contexts. Our analysis indicates a marked increase concentrations enhances its role formation, cumulative five-day production accounting for up 50% total levels. Detailed stable conditions revealed that SAcond initially increases then stabilizes higher levels PM2.5, while relative diminishes. This implies high-polluted environments, reactions drive formation. Given ongoing efforts reduce PM2.5 China, shaping profiles is anticipated become increasingly significant. underscores need renewed focus within broader

Language: Английский

Citations

0
Overlooked Significance of Reactive Chlorines in the Reacted Loss of VOCs and the Formation of O3 and SOA DOI
Wei Ma, Zemin Feng, Xin Chen

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

The photochemical loss of VOCs induced by OH radicals has been proven to be important for diagnosing ozone formation chemistry, while chlorine chemistry is becoming increasingly critical in the atmosphere oxidizing primary pollutants and accelerating secondary pollutants. However, role consumed caused not clear. Here, observations combined with model simulations suggest that depletion oxidized would only promote oxygenated organic molecules (OOMs) but also help explain nonlinear between (O3 OOMs) precursors (VOCs NOx). This enhancement O3 OOMs nonlinearly dependent on ratio NOx, connection aerosol VOCs/NOx provides insight into understanding oxidation processes intermediates from emission, reaction, products.

Language: Английский

Citations

0
New Insights Into the Sources of Atmospheric Organic Aerosols in East China: A Comparison of Online Molecule‐Level and Bulk Measurements DOI
Dafeng Ge, Wei Nie, Yuliang Liu

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(16)

Published: Aug. 26, 2024

Abstract Organic aerosols (OA) significantly contribute to haze pollution, threaten human health, and affect the radiation balance. However, real‐time tracking of OA evolution at molecular level is limited, hindering a comprehensive understanding their origins behaviors. In this study, we investigated wintertime in megacity East China by combining simultaneous measurements from an extractive electrospray ionization time‐of‐flight mass spectrometer (EESI‐TOF) high‐resolution aerosol (AMS) (HR‐TOF‐AMS). AMS results indicate that accounts for about 27% non‐refractory submicron particulate matter (NR‐PM 1 ) on average. EESI‐TOF data reveal C x H y O z N 1–2 are predominant components, contributing over 70% 20%, respectively. Factorization analysis shows while traffic, cooking, biomass burning major primary sources, most (>70% EESI‐TOF, >55% AMS) originate secondary production. although missing hydrocarbon‐like OA, excels providing information oxygenated identifying aromatics aliphatics as possible key precursors. It further differentiates less oxidized organic (SOA) into two factors with distinct compositions, likely due diverse source regions. Importantly, identifies additional factors: one possibly related plasticizers another representing SOA formation monoterpene oxidation NO 3 radicals. conclusion, complements offering valuable insights chemical processes underlying formation, especially complex urban environments.

Language: Английский

Citations

2
Modeling the Formation of Organic Compounds across Full Volatility Ranges and Their Contribution to Nanoparticle Growth in a Polluted Atmosphere DOI
Zeqi Li, Bin Zhao, Dejia Yin

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 58(2), P. 1223 - 1235

Published: Dec. 20, 2023

Nanoparticle growth influences atmospheric particles' climatic effects, and it is largely driven by low-volatility organic vapors. However, the magnitude mechanism of organics' contribution to nanoparticle in polluted environments remain unclear because current observations models cannot capture organics across full volatility ranges or track their formation chemistry. Here, we develop a mechanistic model that characterizes spectrum vapors contributions coupling advanced oxidation modeling kinetic gas-particle partitioning. The applied Nanjing, typical city, effectively captures distribution (with saturation vapor concentrations <0.3 μg/m3), thus accurately reproducing rates (GRs), with 4.91% normalized mean bias. Simulations indicate as particles grow from 4 40 nm, relative fractions GRs attributable increase 59 86%, remaining H2SO4 its clusters. Aromatics contribute much condensable (∼37%), especially (∼61%), contributing most (32–46%) 4–40 nm grow. Alkanes also 19–35% GRs, while biogenic volatile compounds minimally (<13%). Our helps assess impacts predict future changes.

Language: Английский

Citations

2
Linking Precursors and Volatility of Ambient Oxygenated Organic Aerosols Using Thermal Desorption Measurement and Machine Learning DOI
Xinyu Wang,

Yongyi Zhao,

Ke Hu

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: 1(10), P. 1239 - 1251

Published: Aug. 27, 2024

We conducted thermal desorption measurements and machine learning analysis to investigate the volatility precursors of ambient oxygenated organic aerosols (OOA), with a focus on link between them, in variety urban marine locations. found that OOA species measured by an iodide-based Chemical Ionization Mass Spectrometer equipped Filter Inlet for Gases AEROsol (FIGAERO-CIMS) accounted 16 ± 13% OA those locations represented mostly secondary moderate-volatility portion OA. On average, 25.1% number 26.8% mass detected FIGAERO-CIMS winter campaign at site Wuhan, megacity central China, might be attributed decomposition fragments. Our results show precursor differed systematically according location, season, pollution level. The ocean atmosphere was characterized high fractions extremely low compounds (ELVOC) aliphatic species, while inland aromatic fell primarily into (LVOCs) semivolatile (SVOCs) range. volatilities summer, days, daytime were lower than winter, clean nighttime. When PM episode developed from particle growth then period, shifted Low-Mw Median-Mw highly nonvolatile species. study this work also provides important data future closure studies SOA formation its precursors.

Language: Английский

Citations

0
The Pivotal Role of Heavy Terpenes and Anthropogenic Interactions in New Particle Formation on the Southeastern Qinghai-Tibet Plateau DOI Creative Commons
Yuliang Liu, Wei Nie, Ximeng Qi

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 26, 2024

Aerosol particles originating from the Qinghai-Tibet Plateau (QTP) readily reach free troposphere, potentially affecting global radiation and climate. Although new particle formation (NPF) is frequently observed at such high altitudes, its precursors their underlying chemistry remain poorly understood. This study presents direct observational evidence of anthropogenic influences on biogenic NPF southeastern QTP, near Himalayas. The mean nucleation rate (

Language: Английский

Citations

0
Simulation of the Steady Mixing State of Black Carbon With a Two‐Dimensional Sectional Model DOI Creative Commons
Qichang Lin, Jiandong Wang, Chenxi Li

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(23)

Published: Dec. 9, 2024

Abstract Black carbon (BC) strongly absorbs solar radiation and has a warming effect on the earth‐atmosphere system. BC experiences continuous aging, making its optical properties great uncertainty due to complex mixing state. To address this issue, we developed sectional model which is capable of tracking both aerosol size core size. This was applied simulate aging process. The atmospheric observational data from slightly polluted case employed drive model. It shown that BC's characteristics tend reach steady state within 12 hr. Our analysis reveals that, in state, distribution BC‐containing particles demonstrates notable characteristic: particle decreases exponentially as increases. exponential relationship provides simplified yet accurate representation steady‐state validated across diverse conditions.

Language: Английский

Citations

0