A5077059817- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Photodynamic Therapy Research Studies
- Atmospheric and Environmental Gas Dynamics
- Vehicle emissions and performance
- Aeolian processes and effects
- Water Treatment and Disinfection
- Advanced Glycation End Products research
- Sulfur Compounds in Biology
- Redox biology and oxidative stress
- Fire effects on ecosystems
- Analytical chemistry methods development
- Graphene research and applications
- Groundwater and Isotope Geochemistry
- Luminescence and Fluorescent Materials
- Barrier Structure and Function Studies
- Dye analysis and toxicity
- Neurological Disease Mechanisms and Treatments
- Advanced Chemical Physics Studies
- Environmental Chemistry and Analysis
- COVID-19 impact on air quality
State Key Joint Laboratory of Environment Simulation and Pollution Control
2021-2025
Peking University
2021-2025
South China Agricultural University
2022
Jilin University
2021-2022
Jilin Medical University
2021
Although the particle phase state is an important property, there scant information on it, especially, for real-world aerosols. To explore of fine mode aerosols (PM2.5) in two megacities, Seoul and Beijing, we collected PM2.5 filter samples daily from Dec 2020 to Jan 2021. Using optical microscopy combined with poke-and-flow technique, states bulk as a function relative humidity (RH) were determined compared ambient RH ranges cities. was found be liquid semisolid but mostly solid Beijing....
In Northeast Asia, the elevated levels of fine particulate matter (PM2.5) are an environmental concern, yet their physicochemical properties have been poorly characterized. Herein, we determined phase states PM2.5 in 92 filter samples collected from four different cities─Beijing, Seoul, Seosan, and Ulaanbaatar─during 2020–2022, within a temperature range ∼290–293 K. We noted distinct trend boundary relative humidity (RH) liquid semisolid phases these samples. As inorganic fraction increased,...
Abstract Brown carbon (BrC) exhibits a highly complex chemical composition with diverse light‐absorbing properties, which complicates our understanding of its climate impacts. This study examined the impact molecular characteristics (including mass, unsaturation, oxidation state, and polarity) heteroatoms on properties (absorptivity wavelength dependence) BrC from perspective, based ultraviolet‐visible spectra over 40,000 substances in aerosol different sources ambience. Our findings reveal...
Abstract. The particle phase state is crucial for reactive gas uptake, heterogeneous, and multiphase chemical reactions, thereby impacting secondary aerosol formation. This study provides valuable insights into the significance of particle-phase transition liquid water (ALW) in mass growth during winter. Our findings reveal that particles predominantly exist a semi-solid or solid clean winter days with ambient relative humidity (RH) below 30 %. However, non-liquid to occurs when ALW fraction...
Abstract Anthropogenic dust is an important constituent of airborne particles in the urban environment but its ice nucleation activity remains poorly investigated. Here, we studied sources and nucleating properties size‐resolved atmosphere under mixed‐phase cloud conditions. The heat‐resistant (INPs) unexpectedly contributed ∼70% supermicron INPs at temperatures below −15°C. A detailed chemical composition analysis revealed that these were associated with anthropogenic dust, such as...
During the COVID-19 lockdown in 2020, large-scale industrial and transportation emissions were reduced, but high PM
5-Hydroxymethylfurfural (5-HMF) is a processing byproduct present in foods that are consumed daily by humans, and the diet principal route for human exposure to it. However, its adverse effects on gastric epithelial cells not fully understood. Based half inhibitory concentration value, concentrations of HMF 2, 4, 8, 16 mM were selected this study. After 5-HMF treatment 24 h, number living decreased 89.61 ± 0.48, 77.30 0.57, 58.75 0.36, 19.61 0.40% control, respectively. Apoptosis activated...
Abstract. Particle hygroscopicity plays a key role in determining the particle deposition human respiratory tract (HRT). In this study, effects of and mixing state on regional total doses basis number concentration for children, adults, elderly were quantified using Multiple-Path Dosimetry model, based size-resolved measurements at HRT-like conditions (relative humidity = 98 %) performed North China Plain. The measured population with an external was dominated by hygroscopic particles...
Light-absorbing organic aerosols, referred to as brown carbon (BrC), play a vital role in the global climate and air quality. Due complexity of BrC chromophores, identified absorbing substances ambient atmosphere are very limited. However, without comprehensive knowledge complex compounds BrC, our understanding its sources, formation, evolution mechanisms remains superficial, leading great uncertainty climatic atmospheric models. To address this gap, we developed constrained non-negative...
Abstract. Atmospheric humic-like substances (HULIS), a key component of brown carbon (BrC), significantly promote the light absorption aerosols. However, their linkages to pollution sources and ambient temperature in cold environments remain unresolved. Here, we analyze wintertime urban aerosol samples Changchun, Northeast China, using ultrahigh performance liquid chromatography coupled with high-resolution tandem mass spectrometry (UHPLC-HRMS/MS). HULIS show high efficiency (MAE365 = 1.81 ±...
Organosulfates are key compounds driving the anthropogenic enhancement of ambient organic aerosol, however, total organosulfate quantification remains elusive due to their molecular diversity and scarcity authentic standards. Here, we present a solid-phase extraction method that isolates organosulfates from aerosol samples enables identification using mass spectrometry charged detector, respectively. We investigate urban China rural Germany quantify ~130 ~65 chromatographically resolved...
The particle phase state plays a vital role in the gas-particle partitioning, multiphase reactions, ice nucleation activity, and growth atmosphere. However, characterization of atmospheric remains challenging. Herein, based on measured aerosol chemical composition ambient relative humidity (RH), machine learning (ML) model with high accuracy (R2 = 0.952) robustness (RMSE 0.078) was developed to predict rebound fraction, f, which is an indicator state. Using this ML model, f particles urban...
This work established a method for detecting the intermediate products of DBS degraded by<italic>C. vulgaris</italic>, and indicated process degradation.
近些年，我国大气PM<sub>2.5</sub>的质量浓度显著降低，O<sub>3</sub>污染加剧。为了厘清PM<sub>2.5</sub>和O<sub>3</sub>浓度变化相关性的时空差异，本研究分析了我国城市大气PM<sub>2.5</sub>与O<sub>3</sub>日最大8小时滑动平均值（MDA8...
The new particle formation (NPF) process is a significant source of atmospheric secondary particles, which has remarkable impacts on the regional air quality and global radiative forcing. Most NPF studies conduct their measurements at single site, can hardly provide information about regionality events large scales (>100 km). During 2022 Winter Olympic Paralympic Games, simultaneous number size distributions NPF-associated precursors were conducted mountainous site close to Village in...
Anthropogenic dust is an important constituent of airborne particles in the urban environment but its ice nucleation activity remains uninvestigated. Here, we studied sources and nucleating properties size-resolved atmosphere under mixed-phase cloud conditions. The heat-resistant (INPs) unexpectedly contributed ~70% INPs coarse mode at temperatures below −15 oC. Detailed particle chemical composition analysis showed that these were by anthropogenic dust, such as traffic-influenced road dust....