A5060323965- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Spectroscopy and Laser Applications
- Atmospheric and Environmental Gas Dynamics
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Photocatalysis Techniques
- Advanced Chemical Sensor Technologies
- Odor and Emission Control Technologies
- Water Quality Monitoring and Analysis
- COVID-19 impact on air quality
- Analytical Chemistry and Sensors
- Power Systems and Renewable Energy
- Environmental Impact and Sustainability
- Marine and coastal ecosystems
- Metal-Organic Frameworks: Synthesis and Applications
- Optical Systems and Laser Technology
- Urban Stormwater Management Solutions
- Flood Risk Assessment and Management
- Integrated Energy Systems Optimization
Sun Yat-sen University
2020-2025
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
2020-2025
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
2020-2025
Ministry of Education of the People's Republic of China
2023-2025
State Key Joint Laboratory of Environment Simulation and Pollution Control
2017-2024
Peking University
2017-2024
Shanghai University
2021-2024
Zhengzhou University
2023-2024
University College London
2023-2024
Inner Mongolia Agricultural University
2021-2024
Abstract Most of the neural networks proposed so far for computational imaging (CI) in optics employ a supervised training strategy, and thus need large set to optimize their weights biases. Setting aside requirements environmental system stability during many hours data acquisition, practical applications, it is unlikely be possible obtain sufficient numbers ground-truth images training. Here, we propose overcome this limitation by incorporating into conventional deep network complete...
Abstract. The first wintertime in situ measurements of hydroxyl (OH), hydroperoxy (HO2) and organic peroxy (RO2) radicals (ROx=OH+HO2+RO2) combination with observations total reactivity OH radicals, kOH Beijing are presented. field campaign “Beijing winter finE particle STudy – Oxidation, Nucleation light Extinctions” (BEST-ONE) was conducted at the suburban site Huairou near from January to March 2016. It aimed understand oxidative capacity during elucidate secondary pollutants' formation...
This study reveals aerosol liquid water content (ALWC) in PM2.5 ranged from 2% up to 74%, and the associated secondary inorganic fraction rose 24% 55%, while ambient relative humidity (RH) increased 15% 83% atmosphere over Beijing. Unexpectedly, with an increase RH, which is a meteorological parameter independent of anthropogenic activities, indicating presence feedback mechanism driven by Henry's law thermodynamic equilibrium. During haze episodes, simultaneously elevated RH levels mass...
In contrast to summer smog, the contribution of photochemistry formation winter haze in northern mid-to-high latitude is generally assumed be minor due reduced solar UV and water vapor concentrations. Our comprehensive observations atmospheric radicals relevant parameters during several events 2016 Beijing, however, reveal surprisingly high hydroxyl radical oxidation rates up 15 ppbv/h, which comparable values reported photochemical smog two three times larger than those determined previous...
Since 1971, it has been known that the atmospheric free radicals play a pivotal role in maintaining oxidizing power of troposphere. The existence is an important feature troposphere to remove primary air pollutants emitted from human beings as well those biosphere. Nevertheless, serious secondary air-pollution incidents can take place due fast oxidation pollutants. Elucidating free-radical chemistry demanding task field worldwide, which includes two kinds work: first, setup reliable radical...
The heterogeneous hydrolysis of dinitrogen pentoxide (N2O5) is important to understanding the formation particulate nitrate (pNO3–). Measurements N2O5 in surface layer taken at an urban site Beijing are presented here. was observed with large day-to-day variability. High concentrations were determined during pollution episodes co-presence aerosol loads. maximum value 1.3 ppbv (5 s average), associated air mass characterized by a high level O3. uptake coefficients estimated be range...
As nitrous acid (HONO) photolysis is an important source of hydroxyl radical (OH), apportionment the ambient HONO sources necessary to better understand atmospheric oxidation. Based on data HONO-related species and various parameters measured during one–month campaign at Wangdu (a rural site in North China plain) summer 2014, a box model was adopted with input current literature parametrizations for (nitrogen dioxide heterogeneous conversion, photoenhanced adsorbed nitric particulate...
Particulate nitrate (pNO3–) has often been found to be the major component of fine particles in urban air-sheds China, United States, and Europe during winter haze episodes recent years. However, there is a lack knowledge regarding experimentally determined contribution different chemical pathways formation pNO3–. Here, for first time, we combine ground tall-tower observations quantify pNO3– using observationally constrained model approach based on direct OH N2O5 air-shed. We find that...
Nitrogen oxides (NOx = NO + NO2) emitted from combustion and natural sources are reactive gases that regulate the composition of Earth's atmosphere. Nocturnal oxidation driven by nitrate radicals is an important but poorly understood process in atmospheric chemistry, affecting lifetimes NOx ozone particulate pollution levels. Understanding trends to formulating effective mitigation strategies understanding influence on climate. Here we analyse publicly available monitoring data assess...
Abstract. Ambient nitrate has been of increasing concern in PM2.5, while there are still large uncertainties quantifying the formation aerosol. The pathways aerosol at an urban site and a suburban Pearl River Delta (PRD) investigated using observation-constrained box model. Throughout campaigns, pollution episodes were constantly accompanied with increase concentrations fractions both sites. simulations demonstrate that chemical reactions daytime night contributed significantly to boundary...
Fatal issues in lithium metal anodes (LMA), such as detrimental dendrites growth and fragile solid-electrolyte interphase (SEI) during the Li plating/stripping process, often hinder practical application of batteries (LMBs). Herein, cobalt-coordinated sp-carbon-conjugated organic polymer (Co-spc-COP) is constructed protective layer for regulating interface stability LMA. The unique synergistic beneficial effect functional groups (C≡C linkage, C=N units aromatic rings) Co sites not only regulate
Abstract Hydroxyl radicals (OH) determine the tropospheric self-cleansing capacity, thus regulating air quality and climate. However, state-of-the-art mechanisms still underestimate OH at low nitrogen oxide high volatile organic compound regimes even considering latest isoprene chemistry. Here we propose that reactive aldehyde chemistry, especially autoxidation of carbonyl peroxy (R(CO)O 2 ) derived from higher aldehydes, is a noteworthy regeneration mechanism overwhelms contribution...
Abstract. Particulate nitrate (pNO3-) is an important component of secondary aerosols in urban areas. Therefore, it critical to explore its formation mechanism assist with the planning haze abatement strategies. Here we report vertical measurements NOx and O3 by situ instruments on a movable carriage tower during winter heavy-haze episode (18 20 December 2016) Beijing, China. Based box model simulation at different heights, found that pNO3- via N2O5 heterogeneous uptake was negligible ground...
Abstract. Nocturnal reactive nitrogen compounds play an important role in regional air pollution. Here we present the measurements of dinitrogen pentoxide (N2O5) associated with nitryl chloride (ClNO2) and particulate nitrate (pNO3-) at a suburban site Beijing summer 2016. High levels N2O5 ClNO2 were observed outflow urban masses, 1 min average maxima 937 2900 pptv, respectively. The uptake coefficients, γ, yield, f, experimentally determined from parameters. coefficient ranged 0.012 to...
Abstract. Nitryl chloride (ClNO2) accumulation at night acts as a significant reservoir for active chlorine and impacts the following day's photochemistry when atom is liberated sunrise. Here, we report simultaneous measurements of N2O5 suite inorganic halogens including ClNO2 reactions with volatile organic compounds (Cl–VOCs) in gas particle phases utilising Filter Inlet Gas AEROsols time-of-flight chemical ionisation mass spectrometer (FIGAERO-ToF-CIMS) during an intensive measurement...
Abstract. A small and portable incoherent broadband cavity-enhanced absorption spectrometer (IBBCEAS) for NO3 N2O5 measurement has been developed. The instrument features a mechanically aligned non-adjustable optical mounting system, the novel design of system enables fast setup stable operation in field applications. To remove influence strong nonlinear by water vapour, dynamic reference spectrum through NO titration is used analysis. wall loss effects sample were extensively studied, total...
Ozone (O