A5064436169- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Vehicle emissions and performance
- Air Quality Monitoring and Forecasting
- Atmospheric and Environmental Gas Dynamics
- Urban Heat Island Mitigation
- Atmospheric Ozone and Climate
- Plant responses to elevated CO2
- Climate variability and models
- Plant Water Relations and Carbon Dynamics
- Atmospheric aerosols and clouds
- Wind and Air Flow Studies
- Meteorological Phenomena and Simulations
- Marine and coastal ecosystems
- Mercury impact and mitigation studies
- Energy, Environment, Economic Growth
- Remote Sensing and LiDAR Applications
- Fire effects on ecosystems
- Oceanographic and Atmospheric Processes
- Energy and Environment Impacts
- Building Energy and Comfort Optimization
- Land Use and Ecosystem Services
- Water resources management and optimization
- Remote Sensing in Agriculture
- Environmental Impact and Sustainability
Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality
2020-2025
Jinan University
2017-2025
California Air Resources Board
2007-2025
Chinese Academy of Agricultural Sciences
2022-2025
Institute of Agricultural Economics and Development
2022-2025
South China University of Technology
2025
Affiliated Eye Hospital of Wenzhou Medical College
2025
Eye Center
2025
Wenzhou Medical University
2025
National Clinical Research
2025
Thermally derived carbon fractions including organic (OC) and elemental (EC) have been reported for the U.S. Interagency Monitoring of PROtected Visual Environments (IMPROVE) network since 1987 found useful in source apportionment studies to evaluate quartz-fiber filter adsorption vapors. The IMPROVE_A temperature protocol defines plateaus thermally 140 degrees C OC1, 280 OC2, 480 OC3, 580 OC4 a helium (He) carrier gas EC1, 740 EC2, 840 EC3 98% He/2% oxygen (O2) gas. These temperatures...
Abstract. Volatile organic compounds (VOCs) are key precursors of ozone and particulate matter, which the two dominant air pollutants in urban environments. However, compositions sources VOCs aloft have rarely been reported so far. To address this highly time-resolved measurements were made by a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) at 450 m platform on Canton Tower Guangzhou, China. A combination situ modeling techniques was used to characterize variations...
Over the past two decades vehicle emission standards in United States have been dramatically tightened with goal of reducing urban air pollution. Secondary organic aerosol (SOA) is dominant contributor to aerosol. Experiments were conducted at California Air Resources Board Haagen-Smit Laboratory characterize exhaust organics from 20 gasoline vehicles recruited in-use fleet. The spanned a wide range certification standards. We comprehensively characterized intermediate volatility and...
Four heavy-duty and medium-duty diesel vehicles were tested in six different aftertreament configurations using a chassis dynamometer to characterize the occurrence of nucleation (the conversion exhaust gases particles upon dilution). The aftertreatment included four particulate filters two selective catalytic reduction (SCR) devices. All DPFs reduced emissions solid by several orders magnitude, but certain cases volatile mode could increase total particle number emissions. be predicted...
Abstract. Thermal/optical methods have been widely used for quantifying total carbon (TC), organic (OC), and elemental (EC) in ambient source particulate samples. Thermally defined fractions identification. Temperature precision thermal analysis is critical to the allocation of fractions. The sample temperature determined by a thermocouple, which usually located oven near sample. Sample thermocouple may differ owing different properties between filter punch or inhomogeneities heating zone....
Abstract Currently, we have limited knowledge of the physical and chemical properties emitted primary combustion aerosols changes in those caused by nucleation, condensation growth volatile species, particle coagulations under dilution cooling ambient air. A chamber was deployed to sample exhaust from a pilot-scale furnace burning various fuels at nominal heat input rate 160 kW/h−1 3% excess oxygen. The formation mechanisms particles smaller than 420 nm electrical mobility diameter were...
Experiments were conducted at the California Air Resources Board Haagen-Smit Laboratory to understand changes in vehicle emissions response stricter standards over past 25 years. Measurements included a wide range of volatile organic compounds (VOCs) for spark ignition gasoline vehicles meeting varying levels standards, including all certifications from Tier 0 up Partial Zero Emission Vehicle. Standard gas chromatography (GC) and high performance liquid (HLPC) analyses employed drive-cycle...
Abstract Isoprene, a dominant biogenic volatile organic compound that is mainly emitted by trees, has significant impact on the atmospheric chemistry. Regional to global changes in isoprene emission associated with vegetation variations between 2000 and 2015 were estimated using MEGAN model satellite land cover data for inputs this study. The estimates of compared results from previous investigators have either conducted regional studies or used lower resolution data. analysis indicates tree...
In total, 24 polycyclic aromatic hydrocarbons (PAHs) in both gas and particle phases 35 nitro-PAHs phase were analyzed the exhaust from heavy-duty diesel vehicles equipped with after-treatment for particulate matter (PM) NOX control. The test carried out using a chassis dynamometer under highway cruise, transient Urban Dynamometer Driving Schedule (UDDS), idle operation. efficiently abated more than 90% of total PAHs. Indeed, particle-bound PAHs reduced by >99%, gaseous removed at various...
Abstract In recent decades, wintertime sea surface temperatures off the eastern coast of China have steadily increased. The warming is accompanied by on‐coast wind convergence across East Sea and stronger northeasterly which spatially inhomogeneous being greatest in Taiwan Strait. Strong winds favor more frequent cross‐shelf currents vigorous spreading heat from Kuroshio, warms coastal a positive feedback loop. process also weakens Asian winter monsoon over China, contributing to its...
Abstract In winter, a branch of the China Coastal Current can turn in Taiwan Strait to join poleward-flowing Current. The associated cross-strait flows have been inferred from hydrographic and satellite data, observed abundances off northwestern cold-water copepod species Calanus sinicus and, late March 2012, also debris found along shore ship that broke two weeks earlier coast China. dynamics related such cross not previously explained are focus this study using analytical numerical models....
Abstract. Hazardous air pollutants, such as trace elements in particulate matter (PM), are known or highly suspected to cause detrimental effects on human health. To understand the sources and associated risks of PM health, hourly time-integrated major size-segregated coarse (PM2.5–10) fine (PM2.5) were collected at industrial city Foshan Pearl River Delta region, China. Receptor modeling data set by positive matrix factorization (PMF) was used identify six contributing PM2.5 PM10...
Isotopic source apportionment results revealed that nonagricultural sectors are significant sources of ammonia (NH3) emissions, particularly in urban areas. Unfortunately, have been substantially underrepresented the current anthropogenic NH3 emission inventories (EIs). Here, we propose a novel approach to develop gridded EI China for 2016 using combination isotopic and ratios carbon monoxide (CO) NH3. We estimated isotope-corrected emissions were 4370 Gg 2016, accounting an increase total...
Abstract Although particulate matter (PM)‐driven haze is a common phenomenon in many Chinese cities, studies on the sources of its key components, such as organic carbon (OC) and elemental (EC), are poorly constrained. In this study, PM with aerodynamic diameters less than 10 (PM ), 2.5 1 μm ) were collected at an urban site core city Pearl River Delta region summer 2013. The average , mass concentrations 109 ± 28.4, 57.7 15.0, 50.9 13.2 μg/m 3 respectively. A PM‐driven bloom‐decay process...