A5084367988- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Fluid Dynamics and Turbulent Flows
- Particle Dynamics in Fluid Flows
- Air Quality Monitoring and Forecasting
- Aeolian processes and effects
- Vehicle emissions and performance
- Fire dynamics and safety research
- Toxic Organic Pollutants Impact
- Wind and Air Flow Studies
- Fire effects on ecosystems
- Flow Measurement and Analysis
- Lattice Boltzmann Simulation Studies
- Granular flow and fluidized beds
- Geotechnical Engineering and Underground Structures
- Heat Transfer Mechanisms
- Mercury impact and mitigation studies
- Dental Implant Techniques and Outcomes
- Aerosol Filtration and Electrostatic Precipitation
- Peatlands and Wetlands Ecology
- Oil Spill Detection and Mitigation
- Isotope Analysis in Ecology
- Water Systems and Optimization
Southeast University
2025
Colorado State University
2015-2024
Shanghai Jiao Tong University
2011-2022
University of Science and Technology of China
1997-2022
Shanghai First People's Hospital
2022
Fujian Medical University
2021
Zhejiang Sci-Tech University
2021
Weatherford College
2021
Sixth Affiliated Hospital of Kunming Medical University
2020
Kunming Medical University
2020
The House Observations of Microbial and Environmental Chemistry (HOMEChem) study is a collaborative field investigation designed to probe how everyday activities influence the emissions, chemical transformations removal trace gases particles in indoor air. Sequential layered experiments research house included cooking, cleaning, variable occupancy, window-opening. This paper describes overall design HOMEChem presents preliminary case studies investigating concentrations reactive gases,...
Abstract We present emission measurements of volatile organic compounds (VOCs) for western U.S. wildland fires made on the NSF/NCAR C‐130 research aircraft during Western Wildfire Experiment Cloud Chemistry, Aerosol Absorption, and Nitrogen (WE‐CAN) field campaign in summer 2018. VOCs were measured with complementary instruments onboard C‐130, including a proton‐transfer‐reaction time‐of‐flight mass spectrometer (PTR‐ToF‐MS) two gas chromatography (GC)‐based methods. Agreement within...
The collision rate of monodisperse solid particles in a turbulent gas is governed by wide range scales motion the flow. Recent studies have shown that large-scale energetic eddies are dominant factor contributing to relative velocity between two colliding (the transport effect), whereas small-scale dissipative can enhance significantly inducing local non-uniform particle distribution accumulation effect). effect most noticeable when inertial response time τ p order flow integral timescale...
Heterogeneous N 2 O 5 uptake onto aerosol is the primary nocturnal path for removal of NO x (= + ) from atmosphere and can also result in halogen activation through production ClNO . The coefficient has been subject numerous laboratory studies; however, only a few studies have determined ambient measurements, none focused on winter conditions, when portion removed by largest. In this work, coefficients are wintertime measurements related species at Boulder Atmospheric Observatory Weld...
Abstract A comprehensive suite of volatile organic compounds (VOCs) was measured at the semirural Boulder Atmospheric Observatory (BAO) in northeast Colorado during Nitrogen, Aerosol Composition, and Halogens on a Tall Tower (NACHTT) campaign winter 2011. signature elevated nonmethane hydrocarbon (NMHC) mixing ratios observed throughout campaign. The C 2 ‐C 5 alkane were an order magnitude greater than regional background. Light similar to those urban sites impacted by petrochemical industry...
Abstract Hourly measurements of 46 volatile organic compounds (VOCs) from the Boulder Atmospheric Observatory in Erie, CO, were collected over 16 weeks spring and summer 2015. Average VOC reactivity (1.2 s −1 2.4 summer) was lower than most other U.S. urban sites. Positive matrix factorization analysis identified five factors spring, corresponding to sources (1) long‐lived oil natural gas (ONG‐long lived), (2) short‐lived (ONG‐short (3) traffic, (4) background, (5) secondary chemical...
Abstract Reactive nitrogen ( N r ) within smoke plumes plays important roles in the production of ozone, formation secondary aerosols, and deposition fixed to ecosystems. The Western Wildfire Experiment for Cloud Chemistry, Aerosol Absorption, Nitrogen (WE‐CAN) field campaign sampled from 23 wildfires throughout western U.S. during summer 2018 using NSF/NCAR C‐130 research aircraft. We empirically estimate normalized excess mixing ratios emission factors fires 80 min estimated explore...
Numerical experiments have been performed to study the geometric collision rate of finite-size particles with zero inertia (i.e., fluid elements) in isotropic turbulence. The turbulent flow was generated by pseudospectral method. We argue that formulation Saffman and Turner [J. Fluid Mech. 1, 16 (1956)] for average kernel is correct only under assumptions are kept system after allowed overlap space. This confirmed, first time, numerical within a uncertainty as small 1%. Finite corrections...
We study finite-inertia effects on the collision rate of bidisperse heavy particles in a turbulent gas, using direct numerical simulations and kinematic descriptions. As shown previously for monodisperse system (Sundaram & Collins 1997; Wang, Wexler Zhou 2000), statistical mechanical description average kernel consists two parts, namely relative velocity between colliding (the transport effect) non-uniform particle distribution due to dynamic interaction with coherent vortex structures...
Abstract. Multi-year time series records of C2-C6 alkanes, C2-C4 alkenes, ethyne, isoprene, C6-C8 aromatics, trichloroethene (C2HCl3), and tetrachloroethene (C2Cl4) from canister samples collected during January 2004–February 2008 at the University New Hampshire (UNH) AIRMAP Observatory Thompson Farm (TF) in Durham, NH are presented. The objectives this work to identify sources nonmethane hydrocarbons (NMHCs) halocarbons observed TF, characterize seasonal interannual variability ambient...
The Marcellus Shale is the largest natural gas deposit in U.S. and rapid development of this resource has raised concerns about regional air pollution. A field campaign was conducted southwestern Pennsylvania region to investigate impact unconventional (UNG) production operations on quality. Whole samples were collected throughout an 8050 km(2) grid surrounding Pittsburgh analyzed for methane, carbon dioxide, C1-C10 volatile organic compounds (VOCs). Elevated mixing ratios methane C2-C8...
Cookstoves emit many pollutants that are harmful to human health and the environment. However, most of existing scientific literature focuses on fine particulate matter (PM2.5) carbon monoxide (CO). We present an extensive data set speciated air pollution emissions from wood, charcoal, kerosene, liquefied petroleum gas (LPG) cookstoves. One-hundred twenty gas- particle-phase constituents—including organic carbon, elemental (EC), ultrafine particles (10–100 nm), inorganic ions, carbohydrates,...
Abstract. The Bakken formation contains billions of barrels oil and gas trapped in rock shale. Horizontal drilling hydraulic fracturing methods have allowed for extraction these resources, leading to exponential growth production the region over past decade. Along with this development has come an increase associated emissions atmosphere. Concern about potential impacts on federal lands prompted National Park Service sponsor Air Quality Study two winters 2013–2014. Here we provide overview...
Bleach can oxidize volatile organic compounds (VOCs) and contribute to secondary aerosol (SOA) indoors. During the House Observations of Microbial Environmental Chemistry (HOMEChem) campaign, we observed indoor terpene mixing ratios decrease during bleach cleaning periods, with simultaneous increases in oxidized VOC (OVOC) products. Cooking just prior significantly increased SOA due uptake bleach-related OVOCs onto cooking aerosols. While formation occurred, it was small (<3%) relative total...
A fundamental tenet of statistical mechanics is that the rate collision two objects related to expectation value their relative velocities. In pioneering work by Saffman and Turner [J. Fluid Mech. 1, 16 (1956)], different formulations this are used calculate kernel Γ between arbitrary particle size groups in a turbulent flow. The first or spherical formulation based on radial component wr velocity w particles: Γsph=2πR2〈|wr|〉, where wr=w⋅R/R, R separation vector, R=|R|. second cylindrical...
Abstract. Summertime atmospheric toluene enhancements at Thompson Farm in the rural northeastern United States were unexpected and resulted a toluene/benzene seasonal pattern that was distinctly different from of other anthropogenic volatile organic compounds. Consequently, three hydrocarbon sources investigated for potential contributions to during 2004–2006. These included: (1) increased warm season fuel evaporation coupled with changes reformulated gasoline (RFG) content meet US EPA...
A study was conducted to compare measuring particulate mercury (HgP) with the manual filter method and automated Tekran system. Simultaneous measurements were Teflon methodologies in marine coastal continental atmospheres. Overall, HgP values on average 21% higher than HgP, >85% of data outside ±25% region surrounding 1:1 line. In some cases as much 3-fold greater,
Numerical experiments have been performed to study the geometric collision rate of heavy particles with finite inertia. The turbulent flow was generated by direct numerical integration full Navier-Stokes equations. kernel peaked at a particle response time between Kolmogorov and large-eddy turnover times, implying that both large-scale small-scale fluid motions contribute, although in very different manners, rate. Both results for frozen fields stochastic theory show approaches kinetic...
Short‐lived halocarbon tracers were used to investigate marine influences on air quality in a coastal region of New England. Atmospheric measurements made at the University Hampshire's Observing Station Thompson Farm (TF) Durham, Hampshire, indicate that relatively large amounts halocarbons are emitted from local estuarine and oceanic regions. Bromine‐containing interest this work include bromoform (CHBr 3 ) dibromomethane (CH 2 Br ). The mean mixing ratios CHBr CH 11 January 5 March 2002...