A5045619443- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Vehicle emissions and performance
- Water Quality Monitoring and Analysis
- Fire effects on ecosystems
- Indoor Air Quality and Microbial Exposure
- Advanced DC-DC Converters
- Airway Management and Intubation Techniques
- Tracheal and airway disorders
- Graphene research and applications
- Foreign Body Medical Cases
- Electron and X-Ray Spectroscopy Techniques
- Plant responses to elevated CO2
- Nuclear Physics and Applications
- Advanced Chemical Physics Studies
- Advanced Chemical Sensor Technologies
- Toxic Organic Pollutants Impact
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy and Laser Applications
- Luminescence and Fluorescent Materials
Peking University
2023-2025
State Key Joint Laboratory of Environment Simulation and Pollution Control
2024-2025
Georgia Institute of Technology
2017-2024
China Datang Corporation (China)
2024
Soluble transition metals in particulate matter (PM) can generate reactive oxygen species vivo by redox cycling, leading to oxidative stress and adverse health effects. Most metals, such as those from roadway traffic, are emitted an insoluble form, but must be soluble for cycling. Here we present the mechanism of dissolution highly acidic sulfate aerosol effect on particle potential (OP) through analysis size distributions. Size-segregated ambient PM were collected a road-side representative...
Abstract Brown carbon (BrC) is an organic aerosol material that preferentially absorbs light of shorter wavelengths. Global‐scale radiative impacts BrC have been difficult to assess due the lack observational data. To address this, filters were continuously collected with near pole‐to‐pole latitudinal coverage over Pacific and Atlantic basins in three seasons as part Atmospheric Tomography Mission. chromophores filter extracts measured. We find globally, was highly spatially heterogeneous,...
Abstract This article provides an overview of the NASA Atmospheric Tomography (ATom) mission and a summary selected scientific findings to date. ATom was airborne measurements modeling campaign aimed at characterizing composition chemistry troposphere over most remote regions Pacific, Southern, Atlantic, Arctic Oceans, examining impact anthropogenic natural emissions on global scale. These dominate chemical reactivity are exceptionally important for air quality climate. data provide in situ...
Abstract The NOAA/NASA Fire Influence on Regional to Global Environments and Air Quality (FIREX‐AQ) experiment was a multi‐agency, inter‐disciplinary research effort to: (a) obtain detailed measurements of trace gas aerosol emissions from wildfires prescribed fires using aircraft, satellites ground‐based instruments, (b) make extensive suborbital remote sensing fire dynamics, (c) assess local, regional, global modeling fires, (d) strengthen connections observables the ground such as fuels...
Ambient particulate matter may upset redox homeostasis, leading to oxidative stress and adverse health effects. Size distributions of water-insoluble water-soluble OPDTT (dithiothreitol assay, measure potential per air volume) are reported for a roadside site an urban site. The average fractions were 23% 51%, 37% 39%, fine coarse modes at the sites, respectively, measured during different periods. Water-soluble was unimodal, peaked near 1–2.5 μm due contributions from fine-mode organic...
Abstract. An automated analytical system was developed for measuring the oxidative potential (OP) with dithiothreitol (DTT) assay of filter extracts that include both water-soluble and water-insoluble (solid) aerosol species. Three approaches total were compared. These using methanol as solvent (1) without (2) filtering extract, followed by removing reconstituting water, (3) extraction in pure water performing OP analysis vial filter. The method (the third approach, remaining vial) generally...
Abstract. Brown carbon (BrC) associated with aerosol particles in western United States wildfires was measured between July and August 2019 aboard the NASA DC-8 research aircraft during Fire Influence on Regional to Global Environments Air Quality (FIREX-AQ) study. Two BrC measurement methods are investigated, highly spectrally resolved light absorption solvent (water methanol) extracts of collected filters situ bulk particle at three wavelengths (405, 532 664 nm) a photoacoustic...
Abstract Furans are a major class of volatile organic compounds emitted from biomass burning. Their high reactivity with atmospheric oxidants leads to the formation secondary aerosol (SOA), including brown carbon (BrC) that can affect global climate via interactions solar radiation. Here, we investigate optical properties and chemical composition SOA generated photooxidation furfural, 2‐methylfuran, 3‐methylfuran under dry (RH < 5%) humid ∼ 50%) conditions in presence nitrogen oxides (NO...
Abstract. In situ measurements of aerosol microphysical, chemical, and optical properties were made during global-scale flights from 2016–2018 as part the Atmospheric Tomography Mission (ATom). The NASA DC-8 aircraft flew ∼ 84∘ N to 86∘ S latitude over Pacific, Atlantic, Arctic, Southern oceans while profiling nearly continuously between altitudes 160 m 12 km. These global circuits once each season. Particle size distributions measured in cabin at dry conditions with an underwing probe...
Abstract Black carbon (BC) aerosols, which arise from incomplete combustion processes, possess the capacity to absorb solar radiation, thereby contributing significantly issue of climate warming. However, accurately estimating their radiative effect is challenging, influenced by emissions, sizing, morphology, and mixing state. BC particles undergo aging processes that can alter physical characteristics state, consequently affecting optical properties. In this study, we assessed state across...
Abstract Brown carbon (BrC) exhibits a highly complex chemical composition with diverse light‐absorbing properties, which complicates our understanding of its climate impacts. This study examined the impact molecular characteristics (including mass, unsaturation, oxidation state, and polarity) heteroatoms on properties (absorptivity wavelength dependence) BrC from perspective, based ultraviolet‐visible spectra over 40,000 substances in aerosol different sources ambience. Our findings reveal...
Abstract Background Exogenous foreign body aspiration is a common high-risk condition in children. In few cases, can lead to airway granulomas that interfere with tracheoscopic removal and threaten the life of child. Methods This study was retrospective analysis clinical data 184 pediatric patients who were admitted Quanzhou Children’s Hospital from 2018 2021 exogenous tracheobronchial bodies. Results Respiratory bodies tend occur during winter spring seasons. The solid mostly nut bodies,...
Abstract Significant uncertainties exist in quantifying black carbon (BC) warming effects on earth due to the variation its light absorption abilities, which depend morphology. The fractal dimension () of BC aggregates, is a critical morphology factor determining BC's properties. However, cannot be measured online, making it hard study evolution during atmospheric aging processing. We propose novel method measure by establishing relationship between mobility diameter (), , and mass...
Light-absorbing organic aerosols, referred to as brown carbon (BrC), play a vital role in the global climate and air quality. Due complexity of BrC chromophores, identified absorbing substances ambient atmosphere are very limited. However, without comprehensive knowledge complex compounds BrC, our understanding its sources, formation, evolution mechanisms remains superficial, leading great uncertainty climatic atmospheric models. To address this gap, we developed constrained non-negative...
Abstract. Brown carbon (BrC) consists of particulate organic species that preferentially absorb light at visible and ultraviolet wavelengths. Ambient studies show as a component aerosol particles, BrC affects photochemical reaction rates regional to global climate. Some chromophores are especially toxic, linking adverse health effects. The lack direct measurements has limited our understanding its prevalence, sources, evolution, impacts. We describe the first direct, online water-soluble on...
Abstract. Brown carbon (BrC) associated with aerosol particles in western United States wildfires was measured between Jul. and Aug. 2019 onboard the NASA DC-8 research aircraft during Fire Influence on Regional to Global Environments Air Quality (FIREX-AQ) study. Two BrC measurement methods are investigated; highly spectrally-resolved light absorption solvent (water methanol) extracts of collected filters in-situ bulk particle at three wavelengths (405, 532, 664 nm) a photo acoustic...
Abstract. In situ measurements of aerosol microphysical, chemical, and optical properties were made during global-scale flights from 2016–2018 as part the Atmospheric Tomography Mission (ATom). A NASA DC-8 aircraft flew ~84 °N to ~86 °S latitude over Pacific, Atlantic, Arctic, Southern oceans while profiling nearly continuously between altitudes ~160 m ~12 km. These global circuits once each season. Particle size distributions measured in cabin at dry conditions with an underwing probe...
Abstract. An automated analytical system was developed for measuring the oxidative potential (OP) with dithiothreitol (DTT) assay of filter extracts that include both water-soluble and water-insoluble (solid) aerosol species. Three approaches total were compared. These using methanol as solvent (1) without (2) filtering extract, followed by removing reconstituting water, (3) extraction in pure water performing OP analysis vial filter. The method (the third approach, remaining vial) generally...
Black carbon (BC), the most important absorbing component in ambient aerosols, profoundly influences Earth's radiation system and climate change. Previous studies have demonstrated a decline mass concentrations of BC BC-containing particles Beijing over past decade, primarily attributed to stringent emission control measures. In this study, we found substantial decrease absorption cross-section (MAC) during cold seasons Beijing, declining from 9.27 7.34 m&#178;/g span seven years. Three...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Geophysical Research Letters. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Global Measurements of Brown Carbon Estimated Direct Radiative EffectsAuthors Rodney J. Weber iD Linghan Zeng Aoxing Zhang Yuhang Wang Nicholas L. Wagner Joseph M. Katich...