A5074467087- Atmospheric chemistry and aerosols
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Spectroscopy and Laser Applications
- Water Quality Monitoring and Analysis
- Advanced Chemical Physics Studies
- Toxic Organic Pollutants Impact
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Energy, Environment, and Transportation Policies
- Odor and Emission Control Technologies
- Molecular Spectroscopy and Structure
- History and advancements in chemistry
- Spectroscopy and Quantum Chemical Studies
- Mercury impact and mitigation studies
- Global Health Care Issues
- Analytical Chemistry and Chromatography
- Laser Design and Applications
- Oil, Gas, and Environmental Issues
- Climate Change and Health Impacts
- Agriculture, Soil, Plant Science
ENVIRON (United States)
2011-2025
Ramboll (United Kingdom)
2023-2025
Marin Community Foundation
2008-2024
Ram-Chem (China)
2019
Bay Area Air Quality Management District
2019
General Motors (United States)
2002-2009
Golden Gate University
2002
Rafael Advanced Defense Systems (Israel)
1995-1996
York University
1990-1994
University of York
1991
Photochemical grid models are addressing an increasing variety of air quality related issues, yet procedures and metrics used to evaluate their performance remain inconsistent. This impacts the ability place results in quantitative context relative other applications, inform user affected community model uncertainties weaknesses. More consistent evaluations can serve drive improvements modeling process as major weaknesses identified addressed. The large number North American photochemical...
Abstract An updated and expanded version of the Carbon Bond mechanism (CB05) has been incorporated into Community Multiscale Air Quality (CMAQ) modeling system to more accurately simulate wintertime, pristine, high-altitude situations. The CB05 nearly 2 times number reactions relative previous (CB-IV). While expansions do provide detailed treatment urban areas, most new involve biogenics, toxics, species potentially important particulate formation acid deposition. Model simulations were...
Two efficient methods to study relationships between particulate matter (PM) concentrations and emission sources are compared in the three-dimensional comprehensive air quality model with extensions (CAMx). Particulate source apportionment technology (PSAT) is a tagged species method that apportions of PM components their respective primary precursors, e.g., sulfate apportioned SOx, nitrate NOx, etc. The decoupled direct (DDM) calculates first-order sensitivities inputs. Both tools were...
Abstract. The heterogeneous hydrolysis of dinitrogen pentoxide (N2O5) has typically been modeled as only producing nitric acid. However, recent field studies have confirmed that the presence particulate chloride alters reaction product to produce nitryl (ClNO2) which undergoes photolysis generate chlorine atoms and nitrogen dioxide (NO2). Both NO2 affect atmospheric chemistry air quality. We present an updated gas-phase mechanism can be combined with Carbon Bond 05 incorporate into Community...
Abstract. The impact of air pollution on human health and the associated external costs in Europe United States (US) for year 2010 are modeled by a multi-model ensemble regional models frame third phase Air Quality Modelling Evaluation International Initiative (AQMEII3). surface concentrations O3, CO, SO2 PM2.5 used as input to Economic Valuation Pollution (EVA) system calculate resulting impacts from each individual model. Along with base case simulation, additional runs were performed...
Abstract. Numerical air quality models (AQMs) have been applied more frequently over the past decade to address diverse scientific and regulatory issues associated with deteriorated in China. Thorough evaluation of a model's ability replicate monitored conditions (i.e., model performance or MPE) helps illuminate robustness reliability baseline modeling results subsequent analyses. However, numerous input data requirements, configurations, evolution themselves, no two AQM applications are...
Abstract. Through the comparison of several regional-scale chemistry transport modeling systems that simulate meteorology and air quality over European North American continents, this study aims at (i) apportioning error to responsible processes using timescale analysis, (ii) helping detect causes model error, (iii) identifying temporal scales most urgently requiring dedicated investigations. The analysis is conducted within framework third phase Air Quality Model Evaluation International...
The air quality in Republic of Korea, especially cities such as Seoul, has been a serious public health concern over the years. key pollutant atmosphere leading to poor Korea is fine particulate matter (PM2.5). Here, we use 3-D global chemistry model (GEOS-Chem) conduct source attribution PM2.5 from international and domestic emissions. modeling was done for 2015 2016 account different meteorological conditions. We ran GEOS-Chem both years, conducted evaluation using ground aloft...
Abstract. The Tropospheric Monitoring Instrument (TROPOMI) on the Sentinel-5 Precursor (S5P) satellite is a valuable source of information to monitor NOx emissions that adversely affect air quality. We conduct series experiments using 4×4 km2 Comprehensive Air Quality Model with Extensions (CAMx) simulation during April–September 2019 in eastern Texas evaluate multiple challenges arise from reconciling model simulations TROPOMI. find an increase NO2 (+17 % urban areas) when transitioning...
The ozone source apportionment technology (OSAT) estimates the contributions of different sources to concentrations using a set tracers for NOx, total VOCs, and an indicator that ascribes instantaneous production NOx or VOCs. These were compared first-order sensitivities obtained by decoupled direct method (DDM) three-dimensional simulation episode in Lake Michigan region. cut-point OSAT between VOC- NOx-sensitive agrees well with DDM VOC NOx. In ranking most important contributors >80 ppb,...
The decoupled direct method (DDM) has been implemented in a three-dimensional (3D) air quality model order to calculate first-order sensitivities with respect emissions and initial boundary concentrations. This required deriving new equations for the from of hybrid chemistry solver nonlinear advection algorithm model. steps were tested box-model rotating-hill simulations, respectively. complete was then applied an ozone episode Lake Michigan region during July 7−13, 1995. DDM found be highly...