Analysis of new particle formation events and comparisons to simulations of particle number concentrations based on GEOS-Chem–advanced particle microphysics in Beijing, China DOI Creative Commons
Kun Wang, Xiaoyan Ma,

Rong Tian

и другие.

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(7), С. 4091 - 4104

Опубликована: Апрель 5, 2023

Abstract. Aerosol particles play important roles in air quality and global climate change. In this study, we analyze the measurements of particle size distribution from 12 March to 6 April 2016 Beijing characterize new formation (NPF) using observational data sulfuric acid, meteorological parameters, solar radiation, mass concentration fine (PM2.5, particulate matter with diameters less than 2.5 µm). During 26 d campaign, 11 events are identified obvious bursts sub-3 nm number concentrations subsequent growth these nucleated particles. It is found that acid does not have a significant difference between NPF event non-event days. Low relative humidity (RH) high daily total radiation appear be favorable for occurrence events, which quite campaign. The simulations four nucleation schemes, i.e., H2SO4–H2O binary homogeneous (BHN), H2SO4–H2O–NH3 ternary (THN), H2SO4–H2O–ion ion-mediated (BIMN), H2SO4–H2O–NH3–ion (TIMN), based on chemistry transport model (GEOS-Chem) coupled an advanced microphysics (APM) model, conducted study process. Our comparisons indicate BHN scheme BIMN significantly underestimate observed concentrations, THN captures most days well but fails capture noticeable increase 18 1 April. TIMN has improvement terms rates. This provides basis further understanding mechanism Beijing.

Язык: Английский

A kinetic partitioning method for simulating the condensation mass flux of organic vapors in a wide volatility range DOI
Yuyang Li, Runlong Cai, Rujing Yin

и другие.

Journal of Aerosol Science, Год журнала: 2024, Номер 180, С. 106400 - 106400

Опубликована: Май 18, 2024

Язык: Английский

Процитировано

2
Characterization and Seasonal Variation of PM2.5 Composition in Xi’an, Northwest China: Oxygenated and Nitrogenous Organic Aerosol DOI Creative Commons
Yijun Shang, Linjie Li,

Tingting Sun

и другие.

ACS Earth and Space Chemistry, Год журнала: 2024, Номер 8(7), С. 1370 - 1384

Опубликована: Июнь 20, 2024

Oxygenated (CHO) and nitrogenous (CHON) organic aerosols (OA) are important components of fine particulate matter (PM2.5) in urban environments. To achieve a molecular-level understanding the seasonal variation OA fraction, ambient PM2.5 samples collected from April 2018 to March 2019 Xi'an, Northwest China, were analyzed using an iodide Chemical Ionization Mass Spectrometer combined with Filter Inlet for Gases AEROsols (FIGAERO–CIMS). The set compounds identified by FIGAERO–CIMS was estimated represent 28.6% PM2.5. Evaporation temperatures measured indicated that semivolatile (SVOCs) dominant among analytes. Concentrations CHO (6.01 ± 4.24 μg m–3) CHON (3.17 2.34 increased winter, especially during severe haze episode January 2019. comprised up 75.3 3.2% total detected compounds. average carbon oxidation state (OSC¯) slightly elevated summer samples. mainly nitro-aromatics their abundance substantially which attributed extensive biomass burning demonstrated high levels levoglucosan. Biomass-burning related sources accounted 61.0 19.6% 68.3 21.9% concentration autumn respectively, while secondary formation source species spring (70.1 11.6%) (79.8 7.0%). These results emphasize importance as reveal clear need control used heating Xi'an its surroundings.

Язык: Английский

Процитировано

2
Secondary reactions of aromatics-derived oxygenated organic molecules lead to plentiful highly oxygenated organic molecules within an intraday OH exposure DOI Creative Commons
Yuwei Wang, Chuang Li, Ying Zhang

и другие.

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(13), С. 7961 - 7981

Опубликована: Июль 12, 2024

Abstract. Highly oxygenated organic molecules (HOMs) can participate in new particle formation (NPF) and enhance growth of newly formed particles partially because their low volatility. Previous studies have shown HOMs via autoxidation reactions RO2 intermediates generated by OH-initiated oxidation anthropogenic volatile compounds (VOCs). It was also suggested that multi-generation OH could be an important source for aromatics-derived HOMs. However, our understanding the generation is still insufficient, especially mechanisms, which determine molar yields are essential to establishment global chemical box models related In this study, with a potential aerosol mass flow reactor (PAM OFR), two series experiments 1,3,5-trimethylbenzene (1,3,5-TMB) were conducted investigate first series, evolution products 1,3,5-TMB exposure range (0.5–5.0) × 1010 cm−3 s, equivalent 0.7–6.9 h at concentration ([OH]) 2×106 cm−3, investigated nitrate-based ionization spectrometer Vocus proton-transfer-reaction spectrometer, indicating significant secondary chemistry during aging stabilized first-generation within intraday various lower double-bond equivalence (DBE). addition, organonitrates, after introduction NOx into reaction systems, further confirmed existence such reactions. The second same residence time but much [OH], shows [OH] as 1.06×107 53 i.e., around 5.86×108 s. Our study suggests role aromatics if these survived long enough ambient atmosphere elucidates detailed mechanisms certain HOM products.

Язык: Английский

Процитировано

2
Resolving Atmospheric Oxygenated Organic Molecules in Urban Beijing Using Online Ultrahigh-Resolution Chemical Ionization Mass Spectrometry DOI
Yi Yuan, Xin Chen, Runlong Cai

и другие.

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Сен. 27, 2024

Gaseous oxygenated organic molecules (OOMs) are crucial precursors of atmospheric aerosols. OOMs in urban atmospheres have complex compositions, posing challenges to understanding their formation, evolution, and influences. In this study, we identify 2403 gaseous Beijing using online nitrate-based chemical ionization Orbitrap mass spectrometry based on one-year measurements. We find that can be identified with higher accuracy wider coverage, compared previously used spectrometry. With optimized OOM resolving capabilities, previous knowledge expanded. First, clear homologous oxygen-addition characteristics the revealed. Second, lower concentrations or masses characterized high confidence, e.g., above 350 Da. particular, dimers (e.g., C

Язык: Английский

Процитировано

2
Analysis of new particle formation events and comparisons to simulations of particle number concentrations based on GEOS-Chem–advanced particle microphysics in Beijing, China DOI Creative Commons
Kun Wang, Xiaoyan Ma,

Rong Tian

и другие.

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(7), С. 4091 - 4104

Опубликована: Апрель 5, 2023

Abstract. Aerosol particles play important roles in air quality and global climate change. In this study, we analyze the measurements of particle size distribution from 12 March to 6 April 2016 Beijing characterize new formation (NPF) using observational data sulfuric acid, meteorological parameters, solar radiation, mass concentration fine (PM2.5, particulate matter with diameters less than 2.5 µm). During 26 d campaign, 11 events are identified obvious bursts sub-3 nm number concentrations subsequent growth these nucleated particles. It is found that acid does not have a significant difference between NPF event non-event days. Low relative humidity (RH) high daily total radiation appear be favorable for occurrence events, which quite campaign. The simulations four nucleation schemes, i.e., H2SO4–H2O binary homogeneous (BHN), H2SO4–H2O–NH3 ternary (THN), H2SO4–H2O–ion ion-mediated (BIMN), H2SO4–H2O–NH3–ion (TIMN), based on chemistry transport model (GEOS-Chem) coupled an advanced microphysics (APM) model, conducted study process. Our comparisons indicate BHN scheme BIMN significantly underestimate observed concentrations, THN captures most days well but fails capture noticeable increase 18 1 April. TIMN has improvement terms rates. This provides basis further understanding mechanism Beijing.

Язык: Английский

Процитировано

5