A5077613667- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Air Quality Monitoring and Forecasting
- Energy and Environment Impacts
- Climate Change and Health Impacts
- Fire effects on ecosystems
- Indoor Air Quality and Microbial Exposure
- Electric Vehicles and Infrastructure
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Aeolian processes and effects
- Environmental Justice and Health Disparities
- Noise Effects and Management
- Recycling and Waste Management Techniques
- Energy, Environment, and Transportation Policies
- Mercury impact and mitigation studies
- Fire dynamics and safety research
- Space Exploration and Technology
- Plant responses to elevated CO2
- Spacecraft Design and Technology
- Infection Control and Ventilation
Colorado State University
2015-2024
Clarity Films
2024
FORTH Institute of Chemical Engineering Sciences
2019-2023
Foundation for Research and Technology Hellas
2020-2023
Abstract. Motivated by the need to predict how Arctic atmosphere will change in a warming world, this article summarizes recent advances made research consortium NETCARE (Network on Climate and Aerosols: Addressing Key Uncertainties Remote Canadian Environments) that contribute our fundamental understanding of aerosol particles as they relate climate forcing. The overall goal has been use an interdisciplinary approach encompassing extensive field observations range chemical transport, earth...
Abstract. Atmospheric marine aerosol particles impact Earth's albedo and climate. These can be primary or secondary come from a variety of sources, including sea salt, dissolved organic matter, volatile compounds, sulfur-containing compounds. Dimethylsulfide (DMS) emissions contribute greatly to the global biogenic sulfur budget, its oxidation products mass, specifically as sulfuric acid methanesulfonic (MSA). Further, is known nucleating compound, MSA may able participate in nucleation when...
Significance To quantify the full implications of biomass burning emissions on atmosphere, it is essential to accurately represent emission plume after has undergone chemical aging in atmosphere. Atmospheric models typically consider predominant pathway take place presence sunlight (via OH radical); however, this mechanism leads consistent underpredictions oxidized organic aerosol wintertime urban areas. Here, we show, through a combination laboratory experiments, ambient field measurements,...
Abstract. A total of 16 global chemistry transport models and general circulation have participated in this study; 14 been evaluated with regard to their ability reproduce the near-surface observed number concentration aerosol particles cloud condensation nuclei (CCN), as well derived droplet (CDNC). Model results for period 2011–2015 are compared measurements (aerosol particle number, CCN composition submicron fraction) from nine surface stations located Europe Japan. The evaluation focuses...
The Arctic region is vulnerable to climate change and able affect global climate. summertime atmosphere pristine strongly influenced by natural regional emissions, which have poorly understood impacts related atmospheric particles clouds. Here we show that ammonia from seabird-colony guano a key factor contributing bursts of newly formed particles, are observed every summer in the near-surface at Alert, Nunavut, Canada. Our chemical-transport model simulations indicate pan-Arctic...
Abstract Tropospheric aerosol optical depth (AOD) over India was simulated by Goddard Earth Observing System (GEOS)‐Chem, a global 3‐D chemical‐transport model, using SMOG (Speciated Multi‐pOllutant Generator from Indian Institute of Technology Bombay) and GEOS‐Chem (GC) (current inventories used in the model) for 2012. The AODs were ~80% (SMOG) 60% those measured satellites (Moderate Resolution Imaging Spectroradiometer Multi‐angle SpectroRadiometer). There is no strong seasonal variation...
Significance The Earth’s climate is affected by the radiative properties of clouds. In clouds containing both supercooled water droplets and ice particles (mixed-phase clouds), cloud lifetime albedo are presence nucleating (INP). After decades research, importance black carbon (BC) as an INP remains unresolved. this work, we determined contribution BC to concentrations ([INP]) from real-world wildfires prescribed burns. We found that does not contribute significantly [INP] in near-field...
The annual premature mortality in India attributed to exposure ambient particulate matter (PM
Abstract. The spatial distribution and properties of submicron organic aerosol (OA) are among the key sources uncertainty in our understanding effects on climate. Uncertainties particularly large over remote regions free troposphere Southern Ocean, where very few data have been available OA predictions from AeroCom Phase II global models span 2 to 3 orders magnitude, greatly exceeding model spread source regions. (nearly) pole-to-pole vertical non-refractory aerosols was measured with an...
Abstract A database consisting of approximately 4000 storm observations has been objectively analyzed to determine environmental characteristics that produce high radar reflectivities above the freezing level, large total lightning flash rates on order 10 flashes per minute, and anomalous vertical charge structures (most notably, dominant midlevel positive charge). The is drawn from four regions United States featuring distinct environments, each with coinciding Lightning Mapping Array (LMA)...
Abstract The inorganic fraction of fine particles affects numerous physicochemical processes in the atmosphere. However, there is large uncertainty its burden and composition due to limited global measurements. Here, we present observations from eleven different aircraft campaigns around globe investigate how aerosol pH ammonium balance change polluted remote regions, such as over oceans. Both parameters show increasing acidity with remoteness, at all altitudes, decreasing about 3 −1 almost...
Familiarity with the use of face coverings to reduce risk respiratory disease has increased during coronavirus pandemic; however, recommendations for their outside pandemic remains limited. Here, we develop a modeling framework quantify potential health benefits wearing covering or respirator mitigate exposure particulate air pollution. This accounts wide range available and respirators, fit factors efficacy, pollution characteristics, exposure-response data. Our shows that N95 respirators...
Abstract. Aerosol emissions from biofuel combustion impact both health and climate; however, while reducing through improvements to technologies will improve health, the net effect on climate is largely unconstrained. In this study, we examine sensitivities in global aerosol concentration, direct radiative effect, cloud-albedo indirect uncertainties emission factors, optical mixing state, model nucleation background secondary organic (SOA). We use Goddard Earth Observing System...
Abstract Aerosol‐cloud interactions are among the most uncertain climate forcings, in part due to strong sensitivity of cloud droplet number concentration (CDNC) changes size distribution potential condensation nuclei. Despite this simulated aerosol‐cloud variations size‐resolved aerosol concentrations being well established, many chemistry‐climate and chemical‐transport models do not include explicit treatment distribution. We use a global model estimate cloud‐albedo effect (CAE)...
Abstract Immersion‐mode ice‐nucleating particle (INP) concentrations from an off‐road diesel engine were measured using a continuous‐flow diffusion chamber at −30°C. Both petrodiesel and biodiesel utilized, the exhaust was aged up to 1.5 photochemically equivalent days oxidative flow reactor. We found that unaged of both fuels is not likely contribute atmospheric INP mixed‐phase cloud conditions. To explore this further, new limit‐of‐detection parameterization for ice nucleation on...
Abstract. Secondary organic aerosol (SOA) has been shown to form in biomass-burning emissions laboratory and field studies. However, there is significant variability among studies mass enhancement, which could be due differences fuels, fire conditions, dilution, and/or limitations of experiments observations. This study focuses on understanding processes affecting SOA formation smog-chamber ambient plumes. Vapor wall losses have demonstrated an important factor that can suppress traditional...
Abstract. Summertime Arctic aerosol size distributions are strongly controlled by natural regional emissions. Within this context, we use a chemical transport model with size-resolved microphysics (GEOS-Chem-TOMAS) to interpret measurements of from the Canadian Archipelago during summer 2016, as part “NETwork on Climate and Aerosols: Addressing key uncertainties in Remote Environments” (NETCARE) project. Our simulations suggest that condensation secondary organic (SOA) precursor vapors...
Abstract Persons of color have been exposed to a disproportionate burden air pollution across the United States for decades. Yet, inequality in exposure known toxic elements is unclear. Here, we find that populations living racially segregated communities are form fine particulate matter with over three times higher mass proportions and carcinogenic metals. While concentrations total two communities, metals from anthropogenic sources nearly ten higher. Populations disproportionately these...
Uncontrolled combustion of domestic waste has been observed in many countries, creating concerns for air quality; however, the health implications have not yet quantified. We incorporate Wiedinmyer et al (2014 Environ. Sci. Technol. 48 9523–30) emissions inventory into global chemical-transport model, GEOS-Chem, and provide a first estimate premature adult mortalities from chronic exposure to ambient PM2.5 uncontrolled waste. Using concentration-response functions (CRFs) Burnett Health...
Abstract Human exposure to airborne particulate matter (PM) increases the risk of negative health outcomes; however, substantial uncertainty remains in quantifying these exposure‐response relationships. In particular, relating increased mortality PM with diameters smaller than 2.5 μm (PM ) neglects variability underlying size distribution and size‐resolved deposition human airways. this study, we combine a respiratory particle‐deposition model global aerosol estimate particle along tract due...
Abstract. In this paper, we investigate the coagulation of interstitial aerosol particles (particles too small to activate cloud droplets) with drops, a process often ignored in aerosol-climate models. We use GEOS-Chem-TOMAS (Goddard Earth Observing System-Chemistry TwO-Moment Aerosol Sectional) global chemical transport model microphysics calculate changes size distribution, cloud-albedo indirect effect, and direct effect due process. find that inclusion clouds lowers total particle number...
Abstract. Biomass burning is a significant global source of aerosol number and mass. In fresh biomass plumes, coagulation reduces increases the median size distributions, impacting radiative effects. Near-source occurs at spatial scales much smaller than grid boxes many regional models. To date, these models have ignored sub-grid instantly mixed emissions into coarse boxes. A previous study found that rate particle growth by within an individual smoke plume can be approximated using mass...
Updated preindustrial fire emissions consistent with ice core records reduce the magnitude of estimated aerosol radiative forcing.