A5020712773- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Vehicle emissions and performance
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Fire effects on ecosystems
- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Fire dynamics and safety research
- Wind and Air Flow Studies
- Environmental Policies and Emissions
- Ocean Waves and Remote Sensing
- Evaluation Methods in Various Fields
- Geophysics and Gravity Measurements
- Oil, Gas, and Environmental Issues
- Plant responses to elevated CO2
- Fire Detection and Safety Systems
- Nuclear and radioactivity studies
- Aeolian processes and effects
- Arctic and Antarctic ice dynamics
- Groundwater and Isotope Geochemistry
- Soil and Water Nutrient Dynamics
- Odor and Emission Control Technologies
- Climate Change and Health Impacts
Environmental Protection Agency
2016-2025
Research Triangle Park Foundation
2014-2024
Natural Resources Conservation Service
2020
VA Office of Research and Development
2014-2015
Triangle
2008
National Oceanic and Atmospheric Administration
2005-2008
NOAA Air Resources Laboratory
2005-2008
Georgia Institute of Technology
2007
North Carolina State University
2005
Abstract. The mandate of the Task Force Hemispheric Transport Air Pollution (TF HTAP) under Convention on Long-Range Transboundary (CLRTAP) is to improve scientific understanding intercontinental air pollution transport, quantify impacts human health, vegetation and climate, identify emission mitigation options across regions Northern Hemisphere, guide future policies these aspects. harmonization improvement regional inventories imperative obtain consolidated estimates formation global-scale...
Numerous scientific upgrades to the representation of secondary organic aerosol (SOA) are incorporated into Community Multiscale Air Quality (CMAQ) modeling system. Additions include several recently identified SOA precursors: benzene, isoprene, and sesquiterpenes; pathways: in-cloud oxidation glyoxal methylglyoxal, particle-phase oligomerization, acid enhancement isoprene SOA. NOx-dependent aromatic yields also added along with new empirical measurements enthalpies vaporization...
The Community Multiscale Air Quality (CMAQ) model is a comprehensive multipollutant air quality modeling system developed and maintained by the US Environmental Protection Agency's (EPA) Office of Research Development (ORD). Recently, version 5.1 CMAQ (v5.1) was released to public, incorporating large number science updates extended capabilities over previous release (v5.0.2). These include following: improvements in meteorological calculations both Weather Forecast (WRF) used provide fields...
Significance Secondary organic aerosol (SOA) formed from the atmospheric oxidation of gaseous combustion emissions is an important component global fine-particle pollution, which influences Earth’s energy budget and affects human health. However, existing models underpredict amount SOA measured in laboratory experiments atmosphere. We analyze smog chamber data to demonstrate that unspeciated organics are a major class precursors. develop source-specific parameterizations for these using...
The Community Multiscale Air Quality (CMAQ) model version 5.3 (CMAQ53), released to the public in August 2019 and followed by 5.3.1 (CMAQ531) December 2019, contains numerous science updates, enhanced functionality, improved computation efficiency relative previous of model, 5.2.1 (CMAQ521). Major advances new include a aerosol module (AERO7) with significant updates secondary organic (SOA) chemistry, updated chlorine detailed bromine iodine simple halogen addition dimethyl sulfide (DMS)...
The implicit assumption that biogenic secondary organic aerosol (SOA) is natural and can not be controlled hinders effective air quality management. Anthropogenic pollution facilitates transformation of naturally emitted volatile compounds (VOCs) to the particle phase, enhancing ambient concentrations (SOA). It therefore conceivable some portion SOA removed by controlling emissions anthropogenic pollutants. Direct measurement controllable fraction possible, but estimated through...
This paper presents the first National Emissions Inventory (NEI) of fine particulate matter (PM2.5) that includes full suite PM2.5 trace elements (atomic number >10) measured at ambient monitoring sites across U.S. emissions in NEI were organized and aggregated into a set 84 source categories for which chemical speciation profiles are available (e.g., Unpaved Road Dust, Agricultural Soil, Wildfires). Emission estimates ten metals classified as Hazardous Air Pollutants (HAP) refined using...
Abstract. The Community Multiscale Air Quality (CMAQ) model is a state-of-the-science air quality that simulates the emission, transformation, transport, and fate of many different pollutant species comprise particulate matter (PM), including dust (or soil). CMAQ version 5.0 (CMAQv5.0) has several enhancements over previous for estimating emission transport dust, ability to track specific elemental constituents have model-derived concentrations those elements participate in chemistry. latest...
Abstract. Air quality models such as the EPA Community Multiscale Quality (CMAQ) require meteorological data part of input to drive chemistry and transport simulation. The Meteorology-Chemistry Interface Processor (MCIP) is used convert into CMAQ-ready input. Key shortcoming one-way coupling include: excessive temporal interpolation coarsely saved lack feedback atmospheric pollutant loading on simulated dynamics. We have developed a two-way coupled system address these issues. A single...
Abstract. Trends in air quality across the Northern Hemisphere over a 21-year period (1990–2010) were simulated using Community Multiscale Air Quality (CMAQ) multiscale chemical transport model driven by meteorology from Weather Research and Forecasting (WRF) simulations internally consistent historical emission inventories obtained EDGAR. Thorough comparison with several ground observation networks mostly Europe North America was conducted to evaluate performance as well ability of CMAQ...
Identifying communities vulnerable to adverse health effects from exposure wildfire smoke may help prepare responses, increase the resilience and improve public outcomes during days. We developed a Community Health-Vulnerability Index (CHVI) based on factors known risks of air pollution exposures. These included county prevalence rates for asthma in children adults, chronic obstructive pulmonary disease, hypertension, diabetes, obesity, percent population 65 years age older, indicators...
This study, performed under the umbrella of Task Force on Hemispheric Transport Air Pollution (TF-HTAP), responds to global and regional atmospheric modelling community's need a mosaic emission inventory air pollutants that conforms specific requirements: coverage, long time series, spatially distributed emissions with high resolution, sectoral resolution. The approach integrating official inventories based locally reported data, globally consistent methodology, allows modellers perform...
The United States Environmental Protection Agency (US EPA) has developed a set of annual North American emissions data for multiple air pollutants across 18 broad source categories 2002 through 2017. sixteen new inventories were using consistent input and methods all years. When method or tool was not available category, estimated by scaling from the EPA's 2017 National Emissions Inventory with factors based on activity and/or control information. datasets are designed to support regional...
Abstract. Chemical mechanisms describe the atmospheric transformations of organic and inorganic species connect air emissions to secondary such as ozone, fine particles, hazardous pollutants (HAPs) like formaldehyde. Recent advances in our understanding several chemical systems shifts drivers chemistry warrant updates used transport models Community Multiscale Air Quality (CMAQ) modeling system. This work builds on Regional Atmospheric Chemistry Mechanism version 2 (RACM2) develops...
Abstract. Lagrangian tracer simulations are deployed to investigate processes influencing vertical and horizontal dispersion of anthropogenic pollution in Fairbanks, Alaska, during the Alaskan Layered Pollution Chemical Analysis (ALPACA) 2022 field campaign. Simulated concentrations carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), including surface elevated sources, highest at under very cold stable conditions. enhancements above (50–300 m) mainly attributed power plant...
SPECIATE is the U.S. Environmental Protection Agency’s (EPA) repository of volatile organic compounds (VOCs) and particulate matter (PM) speciation profiles air pollution sources. These source can be used to (1) provide input chemical mass balance (CMB) receptor models; (2) verify derived from ambient measurements by multivariate models (e.g., factor analysis positive matrix factorization); (3) interpret measurement data; (4) create speciated emission inventories for regional haze, climate,...
Abstract. An accurate description of emissions is crucial for model simulations to reproduce and interpret observed phenomena over extended time periods. In this study, we used an approach based on activity data develop a consistent series spatially resolved in the United States from 1990 2010. The state-level anthropogenic SO2, NOx, CO, NMVOC (non-methane volatile organic compounds), NH3, PM10 PM2.5 total 49 sectors were estimated several long-term databases containing information about...
Abstract NOAA and the U.S. Environmental Protection Agency (EPA) have developed a national air quality forecasting (AQF) system that is based on numerical models for meteorology, emissions, chemistry. The AQF generates gridded model forecasts of ground-level ozone (O3) can help forecasters to predict alert public onset, severity, duration poor conditions. Although efforts existed in metropolitan centers many years, this provides guidance product first-ever (predominantly rural) areas United...
Abstract. The Community Multiscale Air Quality (CMAQ) modeling system is extended to simulate ozone, particulate matter, and related precursor distributions throughout the Northern Hemisphere. Modeled processes were examined enhanced suitably represent space timescales for such applications. Hemispheric-scale simulations with CMAQ Weather Research Forecasting (WRF) model are performed multiple years. Model capabilities a range of applications including episodic long-range pollutant...