Scholars@Duke
Michael Howard Bergin

Michael Howard Bergin

Sternberg Family Professor of Civil & Environmental Engineering
Civil and Environmental Engineering
michael.bergin@duke.edu
127B Hudson Hall, Box 90287, Durham, NC 27708
127B Hudson Hall, Box 90287, Durham, NC 27708

Selected Publications

A hybrid approach for integrating micro-satellite images and sensors network-based ground measurements using deep learning for high-resolution prediction of fine particulate matter (PM2.5) over an indian city, lucknow

Journal Article Atmospheric Environment · December 1, 2024 The detrimental impacts of fine particulate matter (PM2.5) on human health, climate, ecosystems, crops, and building materials are well-established. However, there remain unresolved inquiries regarding the precise location of the sources of PM2.5. This stu ... Full text Cite

Nasal oxidative stress mediating the effects of colder temperature exposure on pediatric asthma symptoms.

Journal Article Pediatric research · September 2024 BackgroundColder temperature exposure is a known trigger for pediatric asthma exacerbation. The induction of oxidative stress is a known pathophysiologic pathway for asthma exacerbation. However, the role of oxidative stress in linking colder temp ... Full text Cite

Refining Citizen Climate Science: Addressing Preferential Sampling for Improved Estimates of Urban Heat

Journal Article Environmental Science and Technology Letters · August 13, 2024 Studies of urban heat are often limited by their ability to measure air temperature; data are collected either at a few locations over time or at many locations at one point in time. Citizen science approaches to observing temperature provide a way to over ... Full text Cite

Arachidonic Acid Metabolites in Self-collected Biospecimens Following Campfire Exposure: Exploring Non-invasive Biomarkers of Wildfire Health Effects.

Journal Article Environmental science & technology letters · March 2024 Climate change has contributed to increased frequency and intensity of wildfire. Studying its acute effects is limited due to unpredictable nature of wildfire occurrence, which necessitates readily deployable techniques to collect biospecimens. To identify ... Full text Cite

Evaluation of PM2.5 spatio-temporal variability and hotspot formation using low-cost sensors across urban-rural landscape in lucknow, India

Journal Article Atmospheric Environment · February 15, 2024 The high-resolution spatio-temporal monitoring through low-cost sensors (LCS) provides important insights into the dynamics of localized pollution patterns and in conceptualizing effective environmental management and public health interventions. We assess ... Full text Cite

Estimating the effects of vegetation and increased albedo on the urban heat island effect with spatial causal inference.

Journal Article Scientific reports · January 2024 The urban heat island effect causes increased heat stress in urban areas. Cool roofs and urban greening have been promoted as mitigation strategies to reduce this effect. However, evaluating their efficacy remains a challenge, as potential temperature redu ... Full text Open Access Cite

An Investigation on the Pollen-Induced Soiling Losses in Utility-Scale PV Plants

Journal Article IEEE Journal of Photovoltaics · January 1, 2024 In this study, the impact of pollen as a PV soiling agent is investigated. The performance data of five utility-scale PV plants in North Carolina, USA, was collected and analyzed using two soiling extraction methods. Satellite and environmental data, inclu ... Full text Cite

Differentiating local and regional drivers of exceedances of WHO PM2.5 standards with a low-cost sensor network in the greater male’ region (GMR)

Journal Article Atmospheric Pollution Research · January 1, 2024 Although pollution is visible at certain times in the capital Greater Male’ Region (GMR), Maldives, only limited quantitative measures of the pollution concentrations are available. Hence, this study aims to understand the spatiotemporal patterns of Partic ... Full text Cite

Is hydrophobic coating on glass equally efficient in reducing % soiling loss of solar PVs in clean and polluted environments?

Journal Article Solar Energy · November 15, 2023 Hydrophobic-coated glass (CS) on PV surfaces is known to reduce particulate matter (PM) accumulation. However, there is no comparative study on the % reduction in soiling loss (% RSL) on CS with respect to uncoated glass (UCS) for clean and polluted enviro ... Full text Cite

Identifying Waste Burning Plumes Using High-Resolution Satellite Imagery and Machine Learning: A Case Study in the Maldives

Journal Article Environmental Science and Technology Letters · August 8, 2023 A rapid increase in municipal solid waste generation has far outpaced resources to manage waste in many developing countries, resulting in the burning of trash in designated landfills or public places, the release of harmful air pollutants, and exposure of ... Full text Cite

Association between Childhood Asthma Control Test scores and lung pathophysiologic indicators in longitudinal measurements.

Journal Article Journal of thoracic disease · August 2023 BackgroundChildhood Asthma Control Test (C-ACT) is a well-validated questionnaire for asthma controls among 4-11 years old children. This study aims to examine if longitudinal C-ACT score changes could also reflect lung pathophysiologic changes. Full text Cite

Ozone Reaction Products Associated with Biomarkers of Cardiorespiratory Pathophysiology.

Journal Article American journal of respiratory and critical care medicine · May 2023 Full text Cite

Quantitative risk assessment of COVID-19 aerosol transmission indoors: a mechanistic stochastic web application.

Journal Article Environmental technology · April 2023 An increasing body of literature suggests that aerosol inhalation plays a primary role in COVID-19 transmission, particularly in indoor settings. Mechanistic stochastic models can help public health professionals, engineers, and space planners understand t ... Full text Cite

Reduction in solar PV soiling loss using hydrophobic coating with and without dew suppression

Journal Article Solar Energy · March 15, 2023 The deposition of particulate matter (PM) on PV surfaces reduces energy generation, which results in huge losses to the PV industry. Hydrophobic coatings are known to reduce PM deposition on PV surfaces. Covering panels during the night is expected to redu ... Full text Cite

Quantifying the accuracy of optical transmission loss techniques and identifying the best wavelengths for estimating soiling in a field study

Journal Article Solar Energy · March 1, 2023 The optical transmittance loss (OTL) of glass coupons is frequently used to estimate the soiling losses of solar PVs. The soiling loss estimation methodologies (SLEMs) and selection range of wavelengths for OTL evaluation vary significantly, influencing th ... Full text Cite

Associations between personal apparent temperature exposures and asthma symptoms in children with asthma.

Journal Article PloS one · January 2023 Ambient temperature and relative humidity can affect asthma symptoms. Apparent temperature is a measure of temperature perceived by humans that takes into account the effect of humidity. However, the potential link between personal exposures to apparent te ... Full text Cite

An Investigation on the Pollen-Induced Soiling Losses in Utility-Scale PV Plants

Conference Conference Record of the IEEE Photovoltaic Specialists Conference · January 1, 2023 Soiling, the accumulation of dust and other contaminants on the surface of photovoltaic (PV) modules, is a common factor that can negatively impact the performance of PV systems. In this study, the authors aim to analyze the impact of pollen on soiling los ... Full text Cite

A Pilot Study to Quantify Volatile Organic Compounds and Their Sources Inside and Outside Homes in Urban India in Summer and Winter during Normal Daily Activities

Journal Article Environments - MDPI · July 1, 2022 Indian cities have some of the poorest air quality globally but volatile organic compounds (VOCs)—many of which adversely affect health—and their indoor sources remain understudied in India. In this pilot study we quantified hundreds of VOCs inside and out ... Full text Cite

Quantitative microbial risk assessment of outdoor aerosolized pathogens in cities with poor sanitation.

Journal Article The Science of the total environment · June 2022 The aeromicrobiological transmission pathway of enteric pathogens in places with unsafe sanitation services is poorly understood. In an attempt to partly fill this knowledge gap, we assessed the potential public health impact of bioaerosols near open waste ... Full text Cite

Improving spatial variation of ground-level PM2.5 prediction with contrastive learning from satellite imagery

Journal Article Science of Remote Sensing · June 1, 2022 Convolutional Neural Networks (CNNs) are a promising technique to predict highly localized fine particulate matter (i.e., PM2.5 levels) based on high-resolution satellite imagery. Unfortunately, CNNs typically require large amounts of supervised data to pe ... Full text Cite

Oral cavity response to air pollutant exposure and association with pulmonary inflammation and symptoms in asthmatic children.

Journal Article Environmental research · April 2022 Exposure to fine particulate matter (PM2.5) and ozone (O3) may lead to inflammation and oxidative damage in the oral cavity, which is hypothesized to contribute to the worsening of airway inflammation and asthma symptoms. In this pane ... Full text Cite

Source attribution of black and Brown carbon near-UV light absorption in Beijing, China and the impact of regional air-mass transport.

Journal Article The Science of the total environment · February 2022 Black and Brown Carbon (BC, BrC) are key parameters of climate forcing, yet significant challenges exist assigning emission source contributions to light-absorption by carbonaceous aerosols. Additionally, BC and BrC emissions add to extreme air pollution e ... Full text Cite

Detection and Quantification of Enteric Pathogens in Aerosols Near Open Wastewater Canals in Cities with Poor Sanitation.

Journal Article Environmental science & technology · November 2021 Urban sanitation infrastructure is inadequate in many low-income countries, leading to the presence of highly concentrated, uncontained fecal waste streams in densely populated areas. Combined with mechanisms of aerosolization, airborne transport of enteri ... Full text Cite

Seasonal photovoltaic soiling: Analysis of size and composition of deposited particulate matter

Journal Article Solar Energy · October 1, 2021 Photovoltaic soiling - energy loss due to dust and particulate matter (PM) deposition - remains a top concern for global renewable energy generation. To minimize energy losses, the seasonality of soiling needs to be understood. This comprehensive study too ... Full text Cite

Role of endogenous melatonin in pathophysiologic and oxidative stress responses to personal air pollutant exposures in asthmatic children.

Journal Article The Science of the total environment · June 2021 BackgroundHeightening oxidative stress and inflammation is an important pathophysiological mechanism underlying air pollution health effects in people with asthma. Melatonin can suppress oxidative stress and inflammation in pulmonary and circulato ... Full text Cite

Local PM2.5 hotspot detector at 300 m resolution: A random forest-convolutional neural network joint model jointly trained on satellite images and meteorology

Journal Article Remote Sensing · April 1, 2021 Satellite-based rapid sweeping screening of localized PM2.5 hotspots at fine-scale local neighborhood levels is highly desirable. This motivated us to develop a random forest- convolutional neural network-local contrast normalization (RF-CNN-LCN) pipeline ... Full text Cite

Antimicrobial resistance genes are enriched in aerosols near impacted urban surface waters in La Paz, Bolivia.

Journal Article Environmental research · March 2021 Antibiotic resistance poses a major global health threat. Understanding emergence and dissemination of antibiotic resistance in environmental media is critical to the design of control strategies. Because antibiotic resistance genes (ARGs) may be aerosoliz ... Full text Cite

Personal Exposure to PM2.5 Oxidative Potential in Association with Pulmonary Pathophysiologic Outcomes in Children with Asthma.

Journal Article Environmental science & technology · March 2021 Fine particulate matter (PM2.5) with a higher oxidative potential has been thought to be more detrimental to pulmonary health. We aim to investigate the associations between personal exposure to PM2.5 oxidative potential and pulmonary ... Full text Cite

Open Waste Canals as Potential Sources of Antimicrobial Resistance Genes in Aerosols in Urban Kanpur, India.

Journal Article The American journal of tropical medicine and hygiene · March 2021 Understanding the movement of antimicrobial resistance genes (ARGs) in the environment is critical to managing their spread. To assess potential ARG transport through the air via urban bioaerosols in cities with poor sanitation, we quantified ARGs and a mo ... Full text Cite

Real-time measurements of PM2.5 and ozone to assess the effectiveness of residential indoor air filtration in Shanghai homes.

Journal Article Indoor air · January 2021 Portable air cleaners are increasingly used in polluted areas in an attempt to reduce human exposure; however, there has been limited work characterizing their effectiveness at reducing exposure. With this in mind, we recruited forty-three children with as ... Full text Cite

Children's microenvironmental exposure to PM2.5 and ozone and the impact of indoor air filtration.

Journal Article Journal of exposure science & environmental epidemiology · November 2020 BackgroundIn highly polluted urban areas, personal exposure to PM2.5 and O3 occur daily in various microenvironments. Identifying which microenvironments contribute most to exposure can pinpoint effective exposure reduction s ... Full text Cite

Bioaerosol sampling optimization for community exposure assessment in cities with poor sanitation: A one health cross-sectional study.

Journal Article The Science of the total environment · October 2020 Evidence of exposure to enteric pathogens through the air and associated risk of infection is scarce in the literature outside of animal- or human-waste handling settings. Cities with poor sanitation are important locations to investigate this aerial expos ... Full text Cite

Global reduction of solar power generation efficiency due to aerosols and panel soiling

Journal Article Nature Sustainability · September 1, 2020 Air pollution and dust prevail over many regions that have rapid growth of solar photovoltaic (PV) electricity generation, potentially reducing PV generation. Here we combine solar PV performance modelling with long-term satellite-observation-constrained s ... Full text Cite

Malondialdehyde in Nasal Fluid: A Biomarker for Monitoring Asthma Control in Relation to Air Pollution Exposure.

Journal Article Environmental science & technology · September 2020 Fine particulate matter (PM2.5) and ozone (O3) may exert oxidative damage in the nose, which is hypothesized to be associated with worsened asthma symptoms. This study, hence, is to explore whether an oxidative stress biomarker, malon ... Full text Cite

Low-cost solar PV soiling sensor validation and size resolved soiling impacts: A comprehensive field study in Western India

Journal Article Solar Energy · July 1, 2020 Deposition of particulate matter (PM) onto solar photovoltaic (PV) panels - known as soiling - has been estimated to reduce energy production by 10–40% in many regions of the world. Despite this, many key properties including soiling rates, PM source contr ... Full text Cite

Association Between Bedroom Particulate Matter Filtration and Changes in Airway Pathophysiology in Children With Asthma.

Journal Article JAMA pediatrics · June 2020 ImportanceFine particles (particulate matter 2.5 μm [PM2.5]), a ubiquitous air pollutant, can deposit in the small airways that play a vital role in asthma. It appears to be unknown whether the use of a PM2.5 filtration device can improve small ai ... Full text Cite

Associations of personal exposure to air pollutants with airway mechanics in children with asthma.

Journal Article Environment international · May 2020 BackgroundThe importance of airway mechanics has been increasingly recognized in pediatric asthma. However, no studies have examined responses of airway mechanics to air pollution exposure in asthmatic children.MethodsIn this panel study ... Full text Cite

Using flow cytometry and light-induced fluorescence to characterize the variability and characteristics of bioaerosols in springtime in Metro Atlanta, Georgia

Journal Article Atmospheric Chemistry and Physics · February 14, 2020 The abundance and speciation of primary biological aerosol particles (PBAP) is important for understanding their impacts on human health, cloud formation, and ecosystems. Towards this, we have developed a protocol for quantifying PBAP collected from large ... Full text Cite

The impact of household air cleaners on the oxidative potential of PM2.5 and the role of metals and sources associated with indoor and outdoor exposure.

Journal Article Environmental research · February 2020 The health effects associated with human exposure to airborne fine particulate matter (PM2.5) have been linked to the ability of PM2.5 to facilitate the production of excess cellular reactive oxygen species (oxidative potential). Conc ... Full text Cite

Using low-cost sensors to quantify the effects of air filtration on indoor and personal exposure relevant PM2.5 concentrations in Beijing, China

Journal Article Aerosol and Air Quality Research · February 1, 2020 Residents of polluted cities frequently use indoor air purifiers in an attempt to improve their health by reducing their exposure to air pollutants, despite the fact that few studies have assessed these devices under relevant field conditions. Low-cost air ... Full text Cite

Using low-cost sensors to monitor indoor, outdoor, and personal ozone concentrations in Beijing, China.

Journal Article Environmental science. Processes & impacts · January 2020 High concentrations of ground-level ozone (O3) have been measured outdoors across China but there are limited measurements of O3 in microenvironments, including in homes, and for personal exposure. This highlights the need for cheaper ... Full text Cite

The influence of indoor air cleaners on the oxidative potential and sources of metals in indoor, outdoor, and personal exposure of school aged children to PM2.5 in suburban Shanghai, China

Conference 16th Conference of the International Society of Indoor Air Quality and Climate: Creative and Smart Solutions for Better Built Environments, Indoor Air 2020 · January 1, 2020 Cite

Quantifying volatile organic compounds and their sources in residences in Ahmedabad and Gandhinagar, India, and in suburban Shanghai, China

Conference 16th Conference of the International Society of Indoor Air Quality and Climate: Creative and Smart Solutions for Better Built Environments, Indoor Air 2020 · January 1, 2020 Cite

The impact of household air cleaners on the chemical composition and children's exposure to PM2.5 metal sources in suburban Shanghai.

Journal Article Environmental pollution (Barking, Essex : 1987) · October 2019 Increased public awareness of the health impacts of atmospheric fine particulate matter (PM2.5) has led to increased demand and deployment of indoor air cleaners. Yet, questions still remain about the effectiveness of indoor air cleaners on indo ... Full text Cite

Gaussian process regression model for dynamically calibrating and surveilling a wireless low-cost particulate matter sensor network in Delhi

Journal Article Atmospheric Measurement Techniques · September 26, 2019 Wireless low-cost particulate matter sensor networks (WLPMSNs) are transforming air quality monitoring by providing particulate matter (PM) information at finer spatial and temporal resolutions. However, large-scale WLPMSN calibration and maintenance remai ... Full text Cite

Toxic volatile organic compounds in 20 homes in Shanghai: Concentrations, inhalation health risks, and the impacts of household air cleaning

Journal Article Building and Environment · June 15, 2019 Exposure to VOCs causes a variety of adverse health effects, with much of the exposure occurring at home during sleep. The use of an air cleaner maybe an effective and convenient way to reduce associated exposures and health risks. Studies about the impact ... Full text Cite

Deliberating performance targets workshop: Potential paths for emerging PM2.5 and O3 air sensor progress

Journal Article Atmospheric Environment: X · April 1, 2019 The United States Environmental Protection Agency held an international two-day workshop in June 2018 to deliberate possible performance targets for non-regulatory fine particulate matter (PM2.5) and ozone (O3) air sensors. The need for a workshop arose fr ... Full text Cite

Characterization of Spatial Air Pollution Patterns Near a Large Railyard Area in Atlanta, Georgia.

Journal Article International journal of environmental research and public health · February 2019 Railyards are important transportation hubs, and they are often situated near populated areas with high co-located density of manufacturing, freight movement and commercial enterprises. Emissions occurring within railyards can affect nearby air quality. To ... Full text Cite

Overview of the NOAA/ESRL federated aerosol network

Journal Article Bulletin of the American Meteorological Society · January 1, 2019 Full text Cite

Field evaluation of low-cost particulate matter sensors in high-and low-concentration environments

Journal Article Atmospheric Measurement Techniques · August 22, 2018 Low-cost particulate matter (PM) sensors are promising tools for supplementing existing air quality monitoring networks. However, the performance of the new generation of low-cost PM sensors under field conditions is not well understood. In this study, we ... Full text Cite

Seasonality of aerosol optical properties in the Arctic

Journal Article Atmospheric Chemistry and Physics · August 16, 2018 Given the sensitivity of the Arctic climate to short-lived climate forcers, long-term in situ surface measurements of aerosol parameters are useful in gaining insight into the magnitude and variability of these climate forcings. Seasonality of aerosol opti ... Full text Cite

Modeled Response of Greenland Snowmelt to the Presence of Biomass Burning-Based Absorbing Aerosols in the Atmosphere and Snow

Journal Article Journal of Geophysical Research: Atmospheres · June 16, 2018 Biomass burning produces smoke aerosols that are emitted into the atmosphere. Some smoke constituents, notably black carbon, are highly effective light-absorbing aerosols (LAA). Emitted LAA can be transported to high-albedo regions like the Greenland Ice S ... Full text Cite

The influence of air cleaners on indoor particulate matter components and oxidative potential in residential households in Beijing.

Journal Article The Science of the total environment · June 2018 In many developing regions with poor air quality, the use of air filtration devices to clean indoor air is growing rapidly. In this study, we collected indoor, outdoor and personal exposure filter-based samples of fine particulate matter (PM2.5) ... Full text Cite

Characteristics and inhalation cancer risk assessment of exposure to VOCs in 20 asthmatic children's homes in Shanghai

Conference 15th Conference of the International Society of Indoor Air Quality and Climate, INDOOR AIR 2018 · January 1, 2018 Exposure to volatile organic compounds (VOCs) is associated with a variety of adverse health outcomes. In this study, indoor and outdoor concentrations of 640 VOCs and their associated cancer risks are investigated in 20 asthmatic children's homes in Shang ... Cite

On Aethalometer measurement uncertainties and an instrument correction factor for the Arctic

Journal Article Atmospheric Measurement Techniques · December 21, 2017 Several types of filter-based instruments are used to estimate aerosol light absorption coefficients. Two significant results are presented based on Aethalometer measurements at six Arctic stations from 2012 to 2014. First, an alternative method of post-pr ... Full text Cite

Classifying aerosol type using in situ surface spectral aerosol optical properties

Journal Article Atmospheric Chemistry and Physics · October 12, 2017 Knowledge of aerosol size and composition is important for determining radiative forcing effects of aerosols, identifying aerosol sources and improving aerosol satellite retrieval algorithms. The ability to extrapolate aerosol size and composition, or type ... Full text Cite

Large Reductions in Solar Energy Production Due to Dust and Particulate Air Pollution

Journal Article Environmental Science and Technology Letters · August 8, 2017 Atmospheric particulate matter (PM) has the potential to diminish solar energy production by direct and indirect radiative forcing as well as by being deposited on solar panel surfaces, thereby reducing solar energy transmittance to photovoltaics. Worldwid ... Full text Cite

Estimation of atmospheric aerosol composition from ground-based remote sensing measurements of Sun-sky radiometer

Journal Article Journal of Geophysical Research · January 16, 2017 Remote sensing provides aerosol loading information, but to address climate and air quality model validation, there are additional needs to acquire aerosol composition information. In this study, a comprehensive aerosol composition model is established to ... Full text Cite

Oxidative potential of PM2.5 during Atlanta rush hour: Measurements of in-vehicle dithiothreitol (DTT) activity

Journal Article Atmospheric Environment · January 1, 2017 Although exposure to traffic emissions is frequently associated with negative health impacts, few studies have measured air pollution directly in-vehicle, and limited measurements of daily commuter exposure exist. This research, part of the Atlanta Commute ... Full text Cite

Chemical characterization and toxicity of particulate matter emissions from roadside trash combustion in urban India

Journal Article Atmospheric Environment · December 1, 2016 Roadside trash burning is largely unexamined as a factor that influences air quality, radiative forcing, and human health even though it is ubiquitously practiced across many global regions, including throughout India. The objective of this research is to ... Full text Cite

Municipal solid waste and dung cake burning: Discoloring the Taj Mahal and human health impacts in Agra

Journal Article Environmental Research Letters · October 7, 2016 The Taj Mahal - an iconic World Heritage monument built of white marble - has become discolored with time, due, in part, to high levels of particulate matter (PM) soiling its surface (Bergin et al 2015 Environ. Sci. Technol. 49 808-812). Such discoloration ... Full text Cite

Contribution of particulate brown carbon to light absorption in the rural and urban Southeast US

Journal Article Atmospheric Environment · July 1, 2016 Measurements of wavelength dependent aerosol light absorption coefficients were carried out as part of the Southern Oxidant and Aerosol Study (SOAS) during the summer of 2013 to determine the contribution of light absorbing organic carbon (BrC) to total ae ... Full text Cite

International arctic systems for observing the atmosphere: An International Polar Year Legacy Consortium

Journal Article Bulletin of the American Meteorological Society · June 1, 2016 International Arctic Systems for Observing the Atmosphere (IASOA) activities and partnerships were initiated as a part of the 2007-09 International Polar Year (IPY) and are expected to continue for many decades as a legacy program. The IASOA focus is on co ... Full text Cite

The discoloration of the taj mahal: Source apportionment, source impacts & human health outcomes in Agra

Conference International Conference on Atmospheric Optics: Aerosols, Visibility, and the Radiative Balance · January 1, 2016 Cite

Neither dust nor black carbon causing apparent albedo decline in Greenland's dry snow zone: Implications for MODIS C5 surface reflectance

Journal Article Geophysical Research Letters · November 16, 2015 Remote sensing observations suggest Greenland ice sheet (GrIS) albedo has declined since 2001, even in the dry snow zone. We seek to explain the apparent dry snow albedo decline. We analyze samples representing 2012-2014 snowfall across NW Greenland for bl ... Full text Cite

Air quality impacts and health-benefit valuation of a low-emission technology for rail yard locomotives in Atlanta Georgia.

Journal Article The Science of the total environment · November 2015 One of the largest rail yard facilities in the Southeastern US, the Inman and Tilford yards, is located in the northwestern section of Atlanta, Georgia alongside other industries, schools, businesses, and dwellings. It is a significant source of fine parti ... Full text Cite

Contribution of Brown Carbon to Direct Radiative Forcing over the Indo-Gangetic Plain.

Journal Article Environmental science & technology · September 2015 The Indo-Gangetic Plain is a region of known high aerosol loading with substantial amounts of carbonaceous aerosols from a variety of sources, often dominated by biomass burning. Although black carbon has been shown to play an important role in the absorpt ... Full text Cite

Brown carbon aerosol in the North American continental troposphere: Sources, abundance, and radiative forcing

Journal Article Atmospheric Chemistry and Physics · July 16, 2015 Chemical components of organic aerosol (OA) selectively absorb light at short wavelengths. In this study, the prevalence, sources, and optical importance of this so-called brown carbon (BrC) aerosol component are investigated throughout the North American ... Full text Cite

Fine-particle water and pH in the southeastern United States

Journal Article Atmospheric Chemistry and Physics · May 11, 2015 Particle water and pH are predicted using meteorological observations (relative humidity (RH), temperature (T)), gas/particle composition, and thermodynamic modeling (ISORROPIA-II). A comprehensive uncertainty analysis is included, and the model is validat ... Full text Cite

Photocatalytic efficiency of cement-based materials: Demonstration of proposed test method

Journal Article ACI Materials Journal · March 1, 2015 While there is an increasing interest in using photocatalytic cement-based materials, a lack of an appropriate standard procedure for testing the photocatalytic activity and efficiency of such materials makes comparisons among materials and data from diffe ... Full text Cite

Source apportionment of carbonaceous fine particulate matter (PM2.5) in two contrasting cities across the Indo–Gangetic Plain

Journal Article Atmospheric Pollution Research · January 1, 2015 Agra and Kanpur are heavily polluted Indian cities and are the fourth and second largest cities in Uttar Pradesh State, respectively. PM2.5 was collected from December 2011 to May 2012 in Agra and from December 2011 to October 2012 in Kanpur every 6th day. ... Full text Cite

The discoloration of the Taj Mahal due to particulate carbon and dust deposition.

Journal Article Environmental science & technology · January 2015 The white marble domes of the Taj Mahal are iconic images of India that attract millions of visitors every year. Over the past several decades the outer marble surfaces of the Taj Mahal have begun to discolor with time and must be painstakingly cleaned eve ... Full text Cite

Investigation of black and brown carbon multiple-wavelengthdependent light absorption from biomass and fossil fuel combustion source emissions

Journal Article Journal of Geophysical Research · January 1, 2015 Quantification of the black carbon (BC) and brown carbon (BrC) components of source emissions is critical to understanding the impact combustion aerosols have on atmospheric light absorption. Multiple-wavelength absorption was measured from fuels including ... Full text Cite

Exposure to traffic pollution, acute inflammation and autonomic response in a panel of car commuters.

Journal Article Environmental research · August 2014 BackgroundExposure to traffic pollution has been linked to numerous adverse health endpoints. Despite this, limited data examining traffic exposures during realistic commutes and acute response exists.ObjectivesWe conducted the Atlanta Co ... Full text Cite

On-Roadway In-Cabin Exposure to Particulate Matter: Measurement Results Using Both Continuous and Time-Integrated Sampling Approaches.

Journal Article Aerosol science and technology : the journal of the American Association for Aerosol Research · May 2014 The Atlanta Commuters Exposure (ACE) Study was designed to measure in-cabin exposure to roadway particulate pollution and acute health response in a panel of adults with and without asthma following a 2-h scripted route along major highways in Atlanta. Thi ... Full text Cite

Brown carbon in the continental troposphere

Journal Article Geophysical Research Letters · March 28, 2014 Little is known about the optical significance of light absorbing particulate organic compounds (i.e., brown carbon, BrC), including the importance relative to black carbon (BC) and influence on direct radiative forcing by aerosols. The vertical profile of ... Full text Cite

Detection of ppb ozone using a dispersive surface acoustic wave reflective delay line with integrated reference signal

Journal Article Sensors and Actuators, B: Chemical · March 1, 2014 We report the characterization of a dispersive surface acoustic wave (SAW) delay line for the detection of ozone in air at parts-per-billion (ppb) concentrations. Augmenting recent developments in wireless SAW tag technology, we fabricated 435 MHz SAW devi ... Full text Cite

Comparing MODIS daily snow albedo to spectral albedo field measurements in Central Greenland

Journal Article Remote Sensing of Environment · January 1, 2014 The albedo of the Greenland ice sheet plays a key role in the energy balance and climate of the arctic. Change in snow albedo values associated with changing climate conditions can be monitored remotely from satellite platforms viewing the entire Greenland ... Full text Cite

Photocatalytic cement exposed to nitrogen oxides: Effect of oxidation and binding

Journal Article Cement and Concrete Research · January 1, 2014 The photocatalytic oxidation and binding capacity of cement containing titanium dioxide nanoparticles under nitric oxide and nitrogen dioxide gas exposures were examined experimentally both in the presence and absence of ultraviolet (UV) light, to examine ... Full text Cite

Size-resolved measurements of brown carbon in water and methanol extracts and estimates of their contribution to ambient fine-particle light absorption

Journal Article Atmospheric Chemistry and Physics · December 19, 2013 Light absorbing organic carbon, often called brown carbon, has the potential to significantly contribute to the visible light-absorption budget, particularly at shorter wavelengths. Currently, the relative contributions of particulate brown carbon to light ... Full text Cite

Particulate and gas sampling of prescribed fires in South Georgia, USA

Journal Article Atmospheric Environment · December 1, 2013 Gaseous and particulate species from two prescribed fires were sampled in-situ, to better characterize prescribed burn emissions. Measurements included gaseous and fine particulate matter (PM2.5) species, particle number concentration, particulate organic ... Full text Cite

Snow spectral albedo at Summit, Greenland: Measurements and numerical simulations based on physical and chemical properties of the snowpack

Journal Article Cryosphere · August 7, 2013 The broadband albedo of surface snow is determined both by the near-surface profile of the physical and chemical properties of the snowpack and by the spectral and angular characteristics of the incident solar radiation. Simultaneous measurements of the ph ... Full text Cite

Fuel-based fine particulate and black carbon emission factors from a railyard area in Atlanta.

Journal Article Journal of the Air & Waste Management Association (1995) · June 2013 Railyards have the potential to influence localfine particulate matter (aerodynamic diameter < or = 2.5 microm; PM2.5) concentrations through emissions from diesel locomotives and supporting activities. This is of concern in urban regions where railyards a ... Full text Cite

Reply to Smith and Griffin: Methods, air flows, and conclusions are robust in the DeLeon-Rodriguez et al. study.

Journal Article Proceedings of the National Academy of Sciences of the United States of America · June 2013 Full text Cite

Airborne trace metals from coal combustion in Beijing

Journal Article Air Quality, Atmosphere and Health · March 1, 2013 Prior studies have measured elevated ambient concentrations of hazardous metals in Beijing, attributable to coal combustion. The 2008 Olympic Games led to an intense investment in air pollution controls at the major power plants in the region, accounting f ... Full text Cite

Microbiome of the upper troposphere: species composition and prevalence, effects of tropical storms, and atmospheric implications.

Journal Article Proceedings of the National Academy of Sciences of the United States of America · February 2013 The composition and prevalence of microorganisms in the middle-to-upper troposphere (8-15 km altitude) and their role in aerosol-cloud-precipitation interactions represent important, unresolved questions for biological and atmospheric science. In particula ... Full text Cite

Mass absorption efficiency of elemental carbon and water-soluble organic carbon in Beijing, China

Journal Article Atmospheric Chemistry and Physics · November 28, 2011 The mass absorption efficiency (MAE) of elemental carbon (EC) in Beijing was quantified using a thermal-optical carbon analyzer. The MAE measured at 632 nm was 8.45±1.71 and 9.41±1.92 m2 g-1 during winter and summer respectively. The daily variation of MAE ... Full text Cite

Sources of excess urban carbonaceous aerosol in the Pearl River Delta Region, China

Journal Article Atmospheric Environment · February 1, 2011 Carbonaceous aerosol is one of the important constituents of fine particulate matter (PM2.5) in southern China, including the Pearl River Delta (PRD) region and Hong Kong (HK). During the study period (October and December of 2002, and March and June of 20 ... Full text Cite

Aerosol optical properties and radiative forcing in the high Himalaya based on measurements at the Nepal Climate Observatory-Pyramid site (5079 m a.s.l.)

Journal Article Atmospheric Chemistry and Physics · July 12, 2010 Intense anthropogenic emissions over the Indian sub-continent lead to the formation of layers of particulate pollution that can be transported to the high altitude regions of the Himalaya-Hindu-Kush (HKH). Aerosol particles contain a substantial fraction o ... Full text Cite

Functionalization of high frequency SAW RFID devices for ozone dosimetry

Conference Proceedings of IEEE Sensors · December 1, 2009 In this paper we report new work on the gravimetric detection of ozone at EPA and OSHA relevant concentrations (approximately 100 ppb) in filtered ambient air. We have extended our proof-of-concept work which used both quartz crystal microbalance (QCM) and ... Full text Cite

Concentrations and sources of carbonaceous aerosol in the atmosphere of Summit, Greenland

Journal Article Atmospheric Environment · September 1, 2009 High-volume PM2.5 samples were collected at Summit, Greenland for approximately six months from late May through December of 2006. Filters were composited and analyzed for source tracer compounds. The individual organic compounds measured at Summit are ord ... Full text Cite

Gas/particle partitioning of water-soluble organic aerosol in Atlanta

Journal Article Atmospheric Chemistry and Physics · January 1, 2009 Gas and particle-phase organic carbon compounds soluble in water (e.g., WSOC) were measured simultaneously in Atlanta throughout the summer of 2007 to investigate gas/particle partitioning of ambient secondary organic aerosol (SOA). Previous studies have e ... Full text Cite

Correlations between water-soluble organic aerosol and water vapor: a synergistic effect from biogenic emissions?

Journal Article Environmental science & technology · December 2008 Ground-based measurements of meteorological parameters and water-soluble organic carbon in the gas(WSOCg) and particle (WSOCp) phases were carried out in Atlanta, Georgia, from May to September 2007. Fourteen separate events were observed throughout the su ... Full text Cite

Novel optical absorption approach for black carbon (BC) measurement in snow

Conference ACS National Meeting Book of Abstracts · December 1, 2008 Snow is potentially an excellent archive of aerosol deposition history to the polar regions of the world. Black carbon (BC) is an useful tracer of combustion processes and is likely to be relatively stable in snow for periods of time relevant for the recon ... Cite

A method for the analysis of ultra-trace levels of semi-volatile and non-volatile organic compounds in snow and application to a Greenland snow pit

Journal Article Polar Science · December 1, 2008 A method was developed to quantify a suite of organic compounds from snow melt water samples present at trace level concentrations, using a dichloromethane liquid-liquid extraction and GC-MS. Samples from a 3-m snow pit sampled in 2005 from Summit, Greenla ... Full text Cite

Enhanced secondary organic aerosol formation due to water uptake by fine particles

Journal Article Geophysical Research Letters · September 28, 2008 This study characterizes the partitioning behavior of a significant fraction of the ambient organic aerosol through simultaneous measurements of gas and particle water-soluble organic carbon (WSOC). During the summer in Atlanta, WSOC gas/particle partition ... Full text Cite

Simultaneous measurements of particulate and gas-phase water-soluble organic carbon concentrations at remote and urban-influenced locations

Journal Article Geophysical Research Letters · July 16, 2008 The sources, sinks, and overall importance of water-soluble organic carbon (WSOC) in the atmosphere are not well understood. Although the primary historical focus has been on particulate WSOC (WSOCp), here we also present results obtained using a newly dev ... Full text Cite

Atmospheric water-soluble organic carbon measurements at Summit, Greenland

Journal Article Atmospheric Environment · July 1, 2008 The recently discovered active photochemistry in the surface layers of polar snow may complicate the interpretation of organic compounds found in ice cores. In order to better understand the transformation and cycling of organic species in Arctic surface s ... Full text Cite

Local anthropogenic impact on particulate elemental carbon concentrations at Summit, Greenland

Journal Article Atmospheric Chemistry and Physics · May 5, 2008 Summit, Greenland is a remote Arctic research station allowing for field measurements at the highest point of the Greenland Ice Sheet. Due to the current reliance on diesel generators for electricity at Summit, unavoidable local emissions are a potential c ... Full text Cite

ENVR 128-Novel optical absorption approach for black carbon (BC) measurement in snow

Conference ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY · 2008 Cite

Novel optical absorption approach for black carbon (BC) measurement in snow

Conference ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts · January 1, 2008 □ We developed a method to quantify tracq. levels of BC in snow. The approach should have general applicability to many aqueous systems. □ The method requires only a few mL of melted snow, unlike other approaches which demand many liters of snow. The appro ... Cite

A summer time series of particulate carbon in the air and snow at Summit, Greenland

Journal Article Journal of Geophysical Research Atmospheres · November 16, 2007 Carbonaceous particulate matter is ubiquitous in the lower atmosphere, produced by natural and anthropogenic sources and transported to distant regions, including the pristine and climate-sensitive Greenland Ice Sheet. During the summer of 2006, ambient pa ... Full text Cite

Biosensor system for continuous monitoring of organophosphate aerosols.

Journal Article Biosensors & bioelectronics · October 2007 An enzyme-based monitoring system provides the basis for continuous sampling of organophosphate contamination in air. The enzymes butyrylcholinesterase (BuChE) and organophosphate hydrolase (OPH) are stabilized by encapsulation in biomimetic silica nanopar ... Full text Cite

Local and regional anthropogenic influence on PM2.5 elements in Hong Kong

Journal Article Atmospheric Environment · September 1, 2007 Hong Kong's persistent unhealthy level of fine particulate matter is a current public health challenge, complicated by the city being located in the rapidly industrializing Pearl River Delta Region of China. While the sources of the region's fine particula ... Full text Cite

Particulate and water-soluble carbon measured in recent snow at Summit, Greenland

Journal Article Geophysical Research Letters · August 28, 2007 Water-soluble organic carbon (WSOC), water-insoluble particulate organic carbon (WIOC), and particulate elemental carbon (EC) were measured simultaneously for the first time on the Greenland Ice Sheet in surface snow and in a 3-meter snow pit. Snow pit con ... Full text Cite

Size-resolved, real-time measurement of water-insoluble aerosols in metropolitan Atlanta during the summer of 2004

Journal Article Atmospheric Environment · January 1, 2007 During the month of August 2004, the size-resolved number concentration of water-insoluble aerosols (WIA) from 0.25 to 2.0 μm was measured in real-time in the urban center of Atlanta, GA. Simultaneous measurements were performed for the total aerosol size ... Full text Cite

An overview of snow photochemistry: Evidence, mechanisms and impacts

Journal Article Atmospheric Chemistry and Physics · January 1, 2007 It has been shown that sunlit snow and ice plays an important role in processing atmospheric species. Photochemical production of a variety of chemicals has recently been reported to occur in snow/ice and the release of these photochemically generated spec ... Full text Cite

Composition and sources of carbonaceous aerosols at three contrasting sites in Hong Kong

Journal Article Journal of Geophysical Research Atmospheres · October 27, 2006 A significant fraction of the fine particulate matter in Hong Kong is made up of organic carbon. In order to quantitatively assess the contributions of various sources to carbonaceous aerosol in Hong Kong, a chemical mass balance (CMB) receptor model in co ... Full text Cite

The influence of aerosols on crop production: A study using the CERES crop model

Journal Article Agricultural Systems · September 1, 2006 The attenuation of solar radiation by atmospheric aerosols simultaneously decreases the amount of radiation reaching the surface and increases the fraction of radiation which is diffuse. Decreasing the total amount of photosynthetically active radiation (P ... Full text Cite

Source areas and chemical composition of fine particulate matter in the Pearl River Delta region of China

Journal Article Atmospheric Environment · June 1, 2006 Fine particulate matter (PM2.5) was measured for 4 months during 2002-2003 at seven sites located in the rapidly developing Pearl River Delta region of China, an area encompassing the major cities of Hong Kong, Shenzhen and Guangzhou. The 4-month average f ... Full text Cite

Size-resolved, real-time measurement of water-insoluble aerosols in the Chamonix and Maurienne valleys of alpine France

Journal Article Journal of Geophysical Research Atmospheres · May 16, 2006 As part of the Pollution des Vallées Alpines (PoVA) program, the number concentration and size distribution of the total PM2.5 population, as well as the subset that is water-insoluble, were measured in the Chamonix and Maurienne Valleys of the ... Full text Cite

Modeling study of air pollution due to the manufacture of export goods in China's Pearl River Delta.

Journal Article Environmental science & technology · April 2006 The Pearl River Delta is a major manufacturing region on the south coast of China that produces more than dollar 100 billion of goods annually for export to North America, Europe, and other parts of Asia. Considerable air pollution is caused by the manufac ... Full text Cite

New real-time technique to measure the size distribution of water-insoluble aerosols.

Journal Article Environmental science & technology · July 2005 To date, there has been much research into the size distribution of ambient atmospheric aerosols, particularly either the total aerosol population or water-soluble ionic species such as sulfate or nitrate. Meanwhile, there have been virtually no size-resol ... Full text Cite

An evaluation of TRACE-P emission inventories from China using a regional model and chemical measurements

Journal Article Journal of Geophysical Research: Atmospheres · November 27, 2004 We evaluate the TRACE-P emission inventories for gaseous and particulate pollutants from East Asia using chemical measurements made at a rural site in China during the China-MAP Field Intensive in conjunction with a coupled regional climate/chemical transp ... Full text Cite

Aerosol chemical, physical, and radiative characteristics near a desert source region of northwest China during ACE-Asia

Journal Article Journal of Geophysical Research D: Atmospheres · October 16, 2004 The Gobi desert in northwest China is an important source of mineral aerosols over both eastern Asia and the northern Pacific Ocean. In order to determine the chemical, physical, and radiative properties of aerosols originating from the Gobi desert source ... Full text Cite

Aerosol pollution in some Chinese cities: (IUPAC Technical Report)

Journal Article Pure and Applied Chemistry · January 1, 2004 Emissions caused by the use of coal and by traffic have caused serious photochemical smog and aerosol pollution with unique characteristics in most Chinese cities. This report gives an overview of aerosol concentrations in China based on data obtained from ... Full text Cite

Urban aerosol radiative properties: Measurements during the 1999 Atlanta supersite experiment

Journal Article Journal of Geophysical Research: Atmospheres · April 16, 2003 As part of the Atlanta Supersite 1999 study, aerosol radiative and related physical and chemical properties are examined on the basis of measurements of PM2.5 (aerosol particles with aerodynamic diameters, Dp, less than 2.5 μm) in urban Atlanta. In additio ... Full text Cite

Direct aerosol radiative forcing in the Yangtze delta region of China: Observation and model estimation

Journal Article Journal of Geophysical Research: Atmospheres · January 27, 2003 The Yangtze delta region of China is a key agricultural area that experiences relatively high aerosol loadings [Xu et al., 2002]. In order to characterize the aerosol radiative properties and estimate direct aerosol radiative forcing in this region, measur ... Full text Cite

The importance of carbon and mineral dust to seasonal aerosol properties in the Nepal Himalaya

Journal Article Atmospheric Environment · January 1, 2003 Though recent studies suggest that aerosols may influence the Asian monsoons, limited knowledge exists regarding aerosol impacts on regional climate and air quality. To improve understanding of aerosols in the Himalaya, mass concentrations (PM10 and PM2.5) ... Full text Cite

Climate change. Soot takes center stage.

Journal Article Science (New York, N.Y.) · September 2002 Full text Cite

Correlation between model-calculated anthropogenic aerosols and satellite-derived cloud optical depths: Indication of indirect effect?

Journal Article Journal of Geophysical Research D: Atmospheres · May 27, 2002 We consider two independently derived data sets. The first represents the annually averaged distribution of anthropogenic aerosols over East Asia as derived by a coupled regional climate/chemical transport model. The other is the annually averaged distribu ... Cite

Correlation between model-calculated anthropogenic aerosols and satellite-derived cloud optical depths: Indication of indirect effect?

Journal Article JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES · May 2002 {[}1] We consider two independently derived data sets. The first represents the annually averaged distribution of anthropogenic aerosols over East Asia as derived by a coupled regional climate/chemical transport model. The other is the annually averaged di ... Full text Cite

Measurement of aerosol chemical, physical and radiative properties in the Yangtze delta region of China

Journal Article Atmospheric Environment · January 1, 2002 In order to understand the possible influence of aerosols on the environment in the agricultural Yangtze delta region of China, a one-month field sampling campaign was carried out during November 1999 in Linan, China. Measurements included the aerosol ligh ... Full text Cite

Measurement of trace gases and PM2.5 mass and composition near the ground and at 254 m agl during TexAQS 2000

Conference FOURTH CONFERENCE ON ATMOSPHERIC CHEMISTRY: URBAN, REGIONAL AND GLOBAL SCALE IMPACTS OF AIR POLLUTANTS · 2002 Cite

Measurements of aerosol optical depths in the UV-A: A comparison between a USDA Yankee environmental systems UV-Multifilter rotating shadowband radiometer and an EPA Brewer spectrophotometer

Conference Proceedings of SPIE - The International Society for Optical Engineering · January 1, 2002 This study presents measurements of Aerosol Optical Depth (AOD) spectral dependence in the Ultraviolet (UV) (317-368 nm) from a USDA UV-Multi-Filter Rotating Shadow band Radiometer (UV-MFRSR) and an EPA Brewer spectrophotometer collocated at Boulder, Color ... Full text Cite

Impact of atmospheric aerosol light scattering and absorption on terrestrial net primary productivity

Journal Article Global Biogeochemical Cycles · January 1, 2002 Scattering and absorption of sunlight by anthropogenic aerosols reduce the photosynthetically active radiation (PAR) incident upon the Earth's surface, but increase the fraction of the PAR that is diffuse. These alterations to irradiance may elicit conflic ... Full text Cite

Influence of aerosol dry deposition on photosynthetically active radiation available to plants: A case study in the Yangtze delta region of China

Journal Article Geophysical Research Letters · September 15, 2001 In this paper, a new mechanism is proposed by which aerosols decrease the amount of photosynthetically active radiation (PAR) available to plants for photosynthesis. The mechanism involves the scattering and absorption of PAR by water insoluble aerosol par ... Full text Cite

Aerosol radiative, physical, and chemical properties in Beijing during June 1999

Journal Article Journal of Geophysical Research Atmospheres · August 27, 2001 Beijing experiences air pollution such that the sky overhead is gray much of the time even on cloudless days. In order to understand the cause of this problem, the aerosol light scattering coefficient σsp and absorption coefficient σap were measured under ... Full text Cite

A comparison of the aerosol thickness derived from ground-based and airborne measurements

Journal Article Journal of Geophysical Research Atmospheres · June 16, 2000 The extinction optical thickness of particles obtained from scattering and absorption coefficients measured by an airborne integrating nephelometer and particle soot absorption photometer, respectively, is compared with the aerosol optical thickness derive ... Full text Cite

Comparison of aerosol optical depth inferred from surface measurements with that determined by Sun photometry for cloud-free conditions at a continental U.S. site

Journal Article Journal of Geophysical Research Atmospheres · March 16, 2000 Evaluation of the forcing of climate by aerosol scattering of shortwave radiation in cloud-free conditions (direct aerosol forcing) requires knowledge of aerosol optical properties on relevant spatial and temporal scales. It is convenient to measure these ... Full text Cite

Case study of the effects of atmospheric aerosols and regional haze on agriculture: an opportunity to enhance crop yields in China through emission controls?

Journal Article Proceedings of the National Academy of Sciences of the United States of America · November 1999 The effect of atmospheric aerosols and regional haze from air pollution on the yields of rice and winter wheat grown in China is assessed. The assessment is based on estimates of aerosol optical depths over China, the effect of these optical depths on the ... Full text Cite

Models overestimate diffuse clear-sky surface irradiance: A case for excess atmospheric absorption

Journal Article Geophysical Research Letters · October 1, 1998 Radiative transfer models consistently overestimate surface diffuse downward irradiance in cloud-free atmospheres by 9 to 40% at two low altitude sites while correctly calculating direct-normal Solar irradiance. For known systematic and random measurement ... Full text Cite

Relationship between continuous aerosol measurements and firn core chemistry over a 10-year period at the South Pole

Journal Article Geophysical Research Letters · April 15, 1998 Before ice core chemistry can be used to estimate past atmospheric chemistry it is necessary to establish an unambiguous link between concentrations of chemical species in the air and snow. For the first time a continuous long-term record of aerosol proper ... Full text Cite

Effects of non-equilibrium hygroscopic growth of (NH4)2SO4 on dry deposition to water surfaces

Journal Article Environmental Science and Technology · March 1, 1998 Growth of hygroscopic aerosols near water surfaces is believed to enhance dry deposition rates, which are a strong function of particle size. Previous dry deposition models estimate hygroscopic growth by assuming equilibrium between aerosols and water vapo ... Full text Cite

Apportionment of light scattering and hygroscopic growth to aerosol composition

Journal Article Geophysical Research Letters · February 15, 1998 During a recent campaign at the NOAA CMDL monitoring station on Sable Island, Canada (43.93° N, 60.01° W) a dual-nephelometer humidigraph measured the hygroscopic growth factor of aerosol scattering, fRH(σsp), one of the key parameters necessary for estima ... Full text Cite

Biomass burning signatures in the atmosphere of central Greenland

Journal Article Journal of Geophysical Research Atmospheres · January 1, 1998 Daily atmospheric concentrations of participate oxalate measured at the Summit of the Greenland Ice Sheet are presented for the summers 1992 - 1995. We believe that four episodes of elevated concentrations are due to biomass burning plumes passing over the ... Full text Cite

Temporal and spatial variability of snow accumulation in central Greenland

Journal Article Journal of Geophysical Research Atmospheres · December 27, 1997 Snow accumulation records from central Greenland are explored to improve the understanding of the accumulation signal in Greenland ice core records. Results from a "forest" of 100 bamboo poles and automated accumulation monitors in the vicinity of Summit a ... Full text Cite

Evaporation of ammonium nitrate aerosol in a heated nephelometer: Implications for field measurements

Journal Article Environmental Science and Technology · October 1, 1997 Ammonium nitrate is a semivolatile aerosol component under typical ambient conditions and thus difficult to measure. In the field, the aerosol scattering coefficient is usually measured width a nephelometer by heating the ambient aerosol to a low reference ... Full text Cite

Atmospheric deposition of chemical species to polar snow

Journal Article Chemical Engineering Communications · January 1, 1996 Particles and gases can deposit from the atmosphere to polar snow by several mechanisms. Dry deposition can be considered to consist of three steps: aerodynamic transport from the free atmosphere to the viscous sublayer near the surface, boundary layer tra ... Full text Cite

Modeling of the processing and removal of trace gas and aerosol species by Arctic radiation fogs and comparison with measurements

Journal Article Journal of Geophysical Research Atmospheres · January 1, 1996 A Lagrangian radiation fog model is applied to a fog event at Summit, Greenland. The model simulates the formation and dissipation of fog. Included in the model are detailed gas and aqueous phase chemistry, and deposition of chemical species with fog dropl ... Full text Cite

A new cascade impactor for aerosol sampling with subsequent PIXE analysis

Conference Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms · January 1, 1996 A small deposit area low pressure impactor (abbreviated to SDI) has been developed and tested. The device has been designed specifically to collect size-fractionated aerosol samples in remote locations for subsequent chemical analysis by PIXE. The SDI is a ... Full text Cite

Detailed mass size distributions of particulate trace elements at Summit, Greenland

Journal Article Journal of Aerosol Science · January 1, 1996 Full text Cite

The contributions of snow, fog, and dry deposition to the summer flux of anions and cations at Summit, Greenland

Journal Article Journal of Geophysical Research: Atmospheres · August 20, 1995 Experiments were performed during the period May–July of 1993 at Summit, Greenland. Aerosol mass size distributions as well as daily average concentrations of several anionic and cationic species were measured. Dry deposition velocities for SO Full text Cite

A simple model to estimate atmospheric concentrations of aerosol chemical species based on snow core chemistry at Summit, Greenland

Journal Article Geophysical Research Letters · January 1, 1995 A simple model is presented to estimate atmospheric concentrations of chemical species that exist primarily as aerosols based on snow core/ice core chemistry at Summit, Greenland. The model considers the processes of snow, fog, and dry deposition. The depo ... Full text Cite

The contributions of wet, fog, and dry deposition to the summer SO42- flux at summit, Greenland

Conference ICE CORE STUDIES OF GLOBAL BIOGEOCHEMICAL CYCLES · 1995 Cite

The contributions of snow, fog, and dry deposition to the summer flux of anions and cations at Summit, Greenland

Journal Article Journal of Geophysical Research · January 1, 1995 Experiments were performed during the period May-July of 1993 at Summit, Greenland. Aerosol mass size distributions as well as daily average concentrations of several anionic and cationic species were measured. Dry deposition velocities for SO2-4 were esti ... Cite

Soluble acidic species in air and snow at Summit, Greenland

Journal Article Geophysical Research Letters · January 1, 1994 Simultaneous measurements of the concentrations of soluble acidic species in the gas, aerosol and snow phases at Summit, Greenland were made during summer 1993. Mean concentrations of gas phase HCOOH, CH3COOH, and HNO3 (49±28, 32±17 and 0.9±0.6 nmol m−3 ST ... Full text Cite

Fluxes of chemical species to the Greenland ice sheet at Summit by fog and dry deposition

Conference Geochimica et Cosmochimica Acta · January 1, 1994 Experiments were performed during June-July 1992 to determine the impact of dry deposition and fog deposition on surface snow chemical inventories. The fluxes of SO2-4, NO-3, Cl-, MSA, Na, Ca, and Al were measured by collecting deposited fog on flat polyet ... Full text Cite

EVALUATION OF AEROSOL PARTICLE PENETRATION THROUGH PFA TUBING AND ANTISTATIC PFA TUBING.

Journal Article Microcontamination · February 1, 1987 The author focuses on a study of PFA and antistatic PFA tubing. The antistatic PFA material used has a surface resistivity of 10**1**1-10**1**2 OMEGA /sq. For comparison, plasticized PVC and copper tubing were also tested. Copper tubing was tested because ... Cite