A5035978829- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Species Distribution and Climate Change
- Wildlife Ecology and Conservation
- Toxic Organic Pollutants Impact
- Avian ecology and behavior
- Environmental Changes in China
- Land Use and Ecosystem Services
- Remote Sensing in Agriculture
- Fish Ecology and Management Studies
- Atmospheric aerosols and clouds
- Rangeland Management and Livestock Ecology
- Coastal wetland ecosystem dynamics
- Ecology and Vegetation Dynamics Studies
- Vehicle emissions and performance
- Integrated Circuits and Semiconductor Failure Analysis
- Mercury impact and mitigation studies
- Fire effects on ecosystems
- Remote Sensing and Land Use
- Fish Biology and Ecology Studies
- Animal Behavior and Reproduction
- Odor and Emission Control Technologies
Fudan University
2022-2025
Hong Kong Polytechnic University
2025
Linyi People's Hospital
2025
Guangzhou Institute of Geochemistry
2018-2024
Chinese Academy of Sciences
2015-2024
University of Chinese Academy of Sciences
2018-2024
Nanjing University of Information Science and Technology
2022
Institute of Forest Ecology, Environment and Protection
2005-2022
Chinese Academy of Forestry
2005-2022
State Key Laboratory of Organic Geochemistry
2019-2022
Abstract. Brown carbon (BrC) plays an essential impact on radiative forcing due to its ability absorb sunlight. In this study, the optical properties and molecular characteristics of water-soluble methanol-soluble organic (OC; MSOC) emitted from simulated combustion biomass coal fuels vehicle emissions were investigated using ultraviolet–visible (UV–vis) spectroscopy, excitation–emission matrix (EEM) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) coupled with...
The light-absorbing organic aerosol referred to as brown carbon (BrC) affects the global radiative balance. linkages between its molecular composition and light absorption properties how environmental factors influence BrC are not well understood. In this study, atmospheric dissolved matter (ADOM) in 55 samples from Guangzhou was characterized using Fourier transform ion cyclotron resonance mass spectrometry measurements. abundant components ADOM were aliphatics peptide-likes (in structure),...
Atmospheric brown carbon (BrC) is an important constituent of light-absorbing organic aerosols with many unclear issues. Here, the light-absorption properties BrC different polarity characteristics at a regional site Pearl River Delta Region during 2016–2017, influenced by sources and molecular compositions, were revealed using radiocarbon analysis Fourier transform ion cyclotron resonance mass spectrometry. Humic-like substance (HULIS), middle polar (MP), low (LP) fractions constitute 46 ±...
Emission factors and inventories of black carbon (BC) aerosols are crucial for estimating their adverse atmospheric effect. However, it is imperative to separate BC emissions into char soot subgroups due significantly different physicochemical properties potential effects. Here, we present a substantial dataset emission derived from field laboratory measurements. Based on the latest results char-to-soot ratio, further reconstructed years 1960-2017 in China. Our findings indicate that...
Abstract. Organosulfur compounds (OrgSs), especially organosulfates, have been widely reported to be present in large quantities particulate organic matter found various atmospheric environments. Despite hundreds of organosulfates and their formation mechanisms being previously identified, a fraction OrgSs remain unexplained at the molecular level, better understanding pathways critical environmental parameters is required explain variations concentrations. In this study, abundance...
The limited characterization and detection capacity of unknown compounds hinder our understanding the molecular composition toxic in PM2.5. present study applied Fourier transform ion cyclotron resonance mass spectrometry coupled with negative positive electrospray ionization sources (ESI–/ESI+ FT-ICR-MS) to probe characteristics dynamic formation processes effective proinflammatory components organic aerosols (OAs) PM2.5 Guangzhou for one year. We detected abundant molecules OAs, mainly...
Nitrogen-containing organic compounds (NOCs), a type of important reactive-nitrogen species, are abundant in aerosols haze events observed Northern China. However, due to the complex nature NOCs, sources, formation, and influencing factors still ambiguous. Here, molecular composition matters (OMs) hourly PM2.5 samples collected during event China was characterized using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). We found that CHON (formulas containing C, H, O, N...
Abstract The isotope tracer technique plays a key role in identifying the sources and atmospheric processes affecting pollution. of brown carbon (BrC) at Guangzhou during 2017–2018 were characterized by positive matrix factorization with radiocarbon constraints multiple linear regression analysis. primary emission factors fossil fuel combustion (FF) biomass burning (BB) accounted for 34% 27% dissolved BrC absorption λ = 365 nm (Abs ), respectively. total mean light contributed secondary was...
Abstract. Chromophores represent an important portion of light-absorbing species, i.e., brown carbon. Yet knowledge what and how chromophores contribute to aerosol light absorption is still sparse. To address this problem, we examined soluble independent in a set year-round samples from Bangkok. The water-soluble fluorescent identified via excitation–emission matrix (EEM) spectroscopy follow-up parallel factor analysis could be mainly assigned as humic-like substances protein-like...
Abstract Water‐soluble organic carbon (WSOC) is a substantial component of carbonaceous aerosols in South/East Asia. However, the poorly constrained sources, molecular compositions, and light absorption properties WSOC over Asian marine regions lead to large uncertainty climate effects. Herein, we collected aerosol samples from South China Sea eastern Indian Ocean investigate WSOC. The δ 13 C Marine‐influenced (−20.6 ± 1.4‰) was higher than those Continent‐influenced (South Asia‐influenced:...
Abstract Atmospheric nitrogen‐containing organic compounds (NOCs) are critical components of global nitrogen deposition and light‐absorption species. The sources compositions NOCs complex remain largely unknown. Here, in 55 ambient aerosol samples collected Guangzhou, South China, were analyzed via ultrahigh‐resolution Fourier transform ion cyclotron resonance mass spectrometry negative‐ion positive‐ion electrospray ionization (ESI) modes. molecular measured ESI– ESI+ exhibited considerable...
Excitation emission matrix (EEM) spectra coupled with parallel factor analysis (PARAFAC) have been used to characterize brown carbon (BrC). The molecular composition of PARAFAC components is not well understood in atmospheric science, which has impeded the accurate interpretation chemical changes and source apportionment BrC using EEM-PARAFAC methods. We assigned numerous formulas identified by Fourier transform ion cyclotron resonance mass spectrometry (both negative positive electrospray...
Abstract The evolution and the impacts of meteorological conditions on brown carbon (BrC) absorption are not understood, which hinders assessment BrC radiative forcing. To address this issue, 1‐hr time‐resolved PM 2.5 samples collected during three haze events in North China Plain prior to COVID‐19 pandemic were used measure optical properties BrC. By coupling excitation‐emission matrix spectroscopy, chemical tracer analysis with multiple model including positive factorization (PMF) a...
Abstract The roles of organosulfur compounds (OSCs), an important component in organic matter, brown carbon (BrC) aerosol absorption is often overlooked. Here, the molecular composition OSCs and its associations with methanol‐soluble BrC (MS‐BrC) during a haze event North China were revealed using Fourier transform ion cyclotron resonance mass spectrometry analysis. By combining aggregated boosted tree model partial least squares regression estimation, our results suggested that mainly...
Abstract In this paper we describe a new pulsed MOCVD Si-doping approach for AlN epilayers over bulk AlN. The Al-rich growth/doping conditions in the process resulted n-AlN layers with TLM currents that were an order higher than structures on grown/doped at identical temperatures using conventional process. Our work first time demonstrated like other reported approaches such as UV exposure during growth, is also very effective reducing point defects by defect quasi-fermi level-chemical...