A5091656427- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Toxic Organic Pollutants Impact
- Atmospheric and Environmental Gas Dynamics
- Plant responses to elevated CO2
- Oil Spill Detection and Mitigation
- Spectroscopy and Laser Applications
- Lichen and fungal ecology
- Indoor Air Quality and Microbial Exposure
- Thermochemical Biomass Conversion Processes
- Smart Materials for Construction
- Combustion and flame dynamics
- Coal Properties and Utilization
- Marine and coastal ecosystems
- Energy and Environment Impacts
- Catalytic Processes in Materials Science
- Advanced Aircraft Design and Technologies
- Precipitation Measurement and Analysis
- Plant and animal studies
- Water Quality Monitoring and Analysis
- Geomechanics and Mining Engineering
Forschungszentrum Jülich
2022-2025
Weizmann Institute of Science
2016-2023
Guangzhou Institute of Geochemistry
2011-2022
Chinese Academy of Sciences
2011-2022
University of Chinese Academy of Sciences
2012-2016
University of Helsinki
2011-2014
University of Zurich
2013-2014
Helsinki Institute of Physics
2011-2012
Guangzhou Institute of Energy Conversion
2007
Atmospheric brown carbon (BrC) is an important contributor to the radiative forcing of climate by organic aerosols. Because molecular diversity BrC compounds and their dynamic transformations, it challenging predictively understand optical properties. OH radical O3 reactions, together with photolysis, lead diminished light absorption lower warming effects biomass burning BrC. The night-time aging on properties aerosols are less known. To address this knowledge gap, NO3 chemistry tar from...
This study provides molecular insights into the light absorption properties of biomass burning (BB) brown carbon (BrC) through chemical characterization tar condensates generated from heated wood pellets at oxidative and pyrolysis conditions. Both liquid separated "darker oily" "lighter aqueous" immiscible phases. The composition these samples was investigated using reversed-phase chromatography coupled with a photodiode array detector high-resolution mass spectrometer. results revealed two...
We investigate the chemical composition of organic light-absorbing components, also known as brown carbon (BrC) chromophores, formed in a proxy anthropogenic secondary aerosol generated from photooxidation naphthalene (naph-SOA) absence and presence NOx. High-performance liquid chromatography equipped with photodiode array detector electrospray ionization high-resolution mass spectrometer is employed to characterize naph-SOA its BrC components. provide molecular-level insights into optical...
Fine particles (PM 2.5 ) were collected using filter‐based high‐volume samplers during summer‐winter 2008 at a rural site in the central Pearl River Delta (PRD), south China, to determine typical secondary organic aerosol (SOA) tracers from significant biogenic (isoprene, monoterpenes, and sesquiterpenes) anthropogenic (aromatics) precursors. Average isoprene SOA significantly higher summer (126 ng m −3 than fall‐winter (25.1 ), owing largely emission reaction rates summer. monoterpene (11.6...
Abstract. Atmospheric chemistry in background areas is strongly influenced by natural vegetation. Coniferous forests are known to produce large quantities of volatile vapors, especially terpenes. These compounds reactive the atmosphere, and contribute formation growth atmospheric new particles. Our aim was analyze variability mono- sesquiterpene emissions between Scots pine trees, order clarify potential errors caused using emission data obtained from only a few trees models. We also aimed...
We conducted a source apportionment and investigated the atmospheric behavior of carbonaceous aerosols during hazy normal days using radiocarbon ((14)C) biomass burning/secondary organic aerosol (SOA) tracers winter in Guangzhou, China. Haze episodes were formed either abruptly by local emissions or through accumulation particles transported from other areas. The average contributions fossil carbon to elemental (EC), water-insoluble carbon, water-soluble 71 ± 10%, 40 6% 33 3%, respectively....
Isoprene and monoterpenes are important precursors of secondary organic aerosols (SOA) in continents. However, their contributions to over oceans still inconclusive. Here we analyzed SOA tracers from isoprene aerosol samples collected during the Chinese Arctic Antarctic Research Expeditions. Combined with literature reports elsewhere, found that dominant oxidation products isoprene. The concentrations varied considerably. mean average values were approximately one order magnitude higher...
Filter-based particle samples were simultaneously collected at 14 sites across 6 regions of China during the summer 2012. These filters analyzed for secondary organic aerosol (SOA) tracers from biogenic precursors (isoprene, monoterpenes, and β-caryophyllene) anthropogenic aromatics. The sum all SOA ranged 29.9 to 371 ng m−3 with majority isoprene (123 ± 78.8 ng m−3), followed by monoterpenes (10.5 ± 6.64 ng m−3), β-caryophyllene (5.07 ± 3.99 ng m−3), aromatics (2.90 ± 1.52 ng m−3). highest...
Abstract. We describe here characterization of a new state-of-the-art smog chamber facility for studying atmospheric gas-phase and aerosol chemistry. The consists 30 m3 fluorinated ethylene propylene (FEP) Teflon film reactor housed in temperature-controlled enclosure equipped with black lamps as the light source. Temperature can be set range from −10 to 40 °C at accuracy ±1 measured by eight temperature sensors inside one just reactor. Matrix air purified non-methane hydrocarbons (NMHCs)...
Abstract. Following wood pyrolysis, tar ball aerosols were laboratory generated from separated into polar and nonpolar phases. Chemical information of fresh balls was obtained a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) single-particle laser desorption/resonance enhanced multiphoton ionization spectrometry (SP-LD-REMPI-MS). Their continuous refractive index (RI) between 365 425 nm retrieved using broadband cavity spectroscopy (BBCES). Dynamic changes in the...
Adverse health effects due to exposure particulate matter (PM) are among the most important global environmental risks. However, of secondary organic aerosols (SOA), a major component aerosol, largely unknown. Here we exposed lung epithelial cells (A549) fresh and aged SOA particles investigated effect atmospheric aging on cell viability gene expression. Naphthalene- α-pinene-derived were formed in an oxidation flow reactor that simulates formation dominated by OH radical under NOx-free...
Abstract. In China, a rapid increase in passenger vehicles has led to the growing concern of vehicle exhaust as an important source anthropogenic secondary organic aerosol (SOA) megacities hard hit by haze. this study, SOA formation emissions from two idling light-duty gasoline (LDGVs) (Euro 1 and Euro 4) operated China was investigated 30 m3 smog chamber. Five photo-oxidation experiments were carried out at 25 °C with relative humidity around 50 %. After aging OH exposure 5 × 106 molecules...
Biogenic organosulfates (OSs) are important markers of secondary organic aerosol (SOA) formation involving cross reactions biogenic precursors (terpenoids) with anthropogenic pollutants. Until now, there has been rare information about OSs in the air highly polluted areas. In this study, fine particle (PM2.5) samples were separately collected daytime and nighttime from summer to fall 2010 at a site central Pearl River Delta (PRD), South China. Pinene-derived nitrooxy-organosulfates (pNOSs)...
Abstract Isoprene is a substantial contributor to global secondary organic aerosol (SOA). The formation of isoprene SOA (SOA I ) highly influenced by anthropogenic emissions. Currently, there rare information regarding in polluted regions. In this study, one-year concurrent observation tracers was undertaken at 12 sites across China for the first time. formed from HO 2 -channel exhibited higher concentrations rural sites, while tracer NO/NO showed levels urban sites....
Nighttime oxidation of biogenic volatile organic compounds (BVOCs) by nitrate radicals (NO3·) represents one the most important interactions between anthropogenic and natural emissions, leading to substantial secondary aerosol (SOA) formation. The direct climatic effect such SOA cannot be quantified because its optical properties atmospheric fate are poorly understood. In this study, we generated from NO3· a series BVOCs including isoprene, monoterpenes, sesquiterpenes. were subjected...
Human activities release large amounts of anthropogenic pollutants into the air, and thereby produce substantial secondary organic aerosol (SOA). Aromatic hydrocarbons (AHs) that mainly emitted from coal combustion, transportation, solvent use biofuel/biomass burning, are a major class SOA precursors. At present, there few field studies focusing on AH-derived (SOAA) continental scale, especially in polluted regions world. In this study, one-year concurrent observation SOAA tracer,...
Abstract. Sulfur dioxide (SO2) can enhance the formation of secondary aerosols from biogenic volatile organic compounds (VOCs), but its influence on aerosol anthropogenic VOCs, particularly complex mixtures like vehicle exhaust, remains uncertain. Gasoline exhaust (GVE) and SO2, a typical pollutant coal burning, are directly co-introduced into smog chamber, in this study, to investigate (SOA) sulfate through photooxidation. New particle was enhanced, while substantial formed oxidation SO2...
It has been hypothesized that the cytotoxicity of secondary organic aerosols (SOA) is mediated through formation reactive oxygen species (ROS) in exposed cells. Here, lung epithelial cells (A549) residing at air-liquid interface were to proxies anthropogenic and biogenic SOA photochemically aged under varying nitrogen oxide (NOx) concentrations an oxidation flow reactor. The total peroxides ROS radical content quantified by iodometric spectrophotometric method continuous-wave electron...
Secondary organic aerosols (SOAs) affect incoming solar radiation by interacting with light at ultraviolet and visible wavelength ranges. However, the relationship between chemical composition optical properties of SOA is still not well understood. In this study, complex refractive index (RI) produced from OH oxidation naphthalene in presence nitrogen oxides (NOx) was retrieved online range 315–650 nm bulk characterized an high-resolution time-of-flight mass spectrometer. addition,...
The wavelength-dependence of the complex refractive indices (RI) in visible spectral range secondary organic aerosols (SOA) are rarely studied, and evolution RI with atmospheric aging is largely unknown. In this study, we applied a novel white light-broadband cavity enhanced spectroscopy to measure changes (400–650 nm) β-pinene p-xylene SOA produced aged an oxidation flow reactor, simulating daytime under NOx-free conditions. It was found that these not absorbing range, real part RI, n,...