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Records 26 to 50 of 263

New Bidirectional Ammonia Flux Model in an Air Quality Model Coupled With an Agricultural Model
(JOURNAL) [Published : Oct 24, 2019]
Ammonia surface flux is often bidirectional, i.e., net flux can be either upward or downward. In fertilized agricultural croplands and grasslands there is usually more emission than deposition especially in mid-day during warmer seasons. In North America, most of the ammonia emi...
The Impact of the Direct Effect of Aerosols on Meteorology and Air Quality Using Aerosol Optical Depth Assimilation During the KORUS‐AQ Campaign
(JOURNAL) [Published : Aug 15, 2019]
To quantify the impact of the direct aerosol effect accurately, this study incorporated the Geostationary Ocean Color Imager (GOCI) aerosol optical depth (AOD) into a coupled meteorology‐chemistry model. We designed three model simulations to observe the impact of AOD assim...
Increasing Isoprene Epoxydiol-to-Inorganic Sulfate Aerosol Ratio Results in Extensive Conversion of Inorganic Sulfate to Organosulfur Forms: Implications for Aerosol Physicochemical Properties
(JOURNAL) [Published : Aug 06, 2019]
Acid-driven multiphase chemistry of isoprene epoxydiols (IEPOX), a key isoprene oxidation product, with inorganic sulfate aerosol yields substantial amounts of secondary organic aerosol (SOA) through the formation of organosulfur. The extent and implications of inorganic-to-organ...
High-altitude and long-range transport of aerosols causing regional severe haze during extreme dust storms explains why afforestation does not prevent storms
(JOURNAL) [Published : Sep 02, 2019]
Climate change is predicted to induce more extreme events such as storms, heat waves, drought and floods. Dust storms are frequently occurring in northern China. Those storms degrade air quality by decreasing visibility and inducing cardiovascular and respiratory diseases. To con...
α-Pinene-Derived organic coatings on acidic sulfate aerosol impacts secondary organic aerosol formation from isoprene in a box model
(JOURNAL) [Published : Sep 15, 2019]
Fine particulate matter (PM2.5) is known to have an adverse impact on public health and is an important climate forcer. Secondary organic aerosol (SOA) contributes up to 80% of PM2.5 worldwide and multiphase reactions are an important pathway to form SOA. Aerosol-phase state is t...
Lightning NOx Emissions and the Implications for Surface Air Quality over the Contiguous United States
(JOURNAL) [Published : Nov 01, 2018]
As one of the largest sources of natural NOX, it is estimated that lightning-induced NOX (LNOX) contributes 10-15% of the total global NOX emissions budget. Lightning activity exhibits strong spatial and temporal variations, and consequently so does the tropospheric distribution ...
Workshop To Evaluate Uncertainties In The Assessment Of The Impacts Of Global Change On Air Quality
(JOURNAL) [Published : Sep 19, 2006]
A workshop will be conducted to evaluate approaches for characterizing, quantifying and communicating uncertainty when assessing global change effects on US air quality. The discussion focused on the US EPA ORD Global Research Program Air Quality assessment -- a complex, model-b...
Updates to the Noah Land Surface Model in WRF‐CMAQ to Improve Simulated Meteorology, Air Quality, and Deposition
(JOURNAL) [Published : Feb 14, 2019]
Regional, state, and local environmental regulatory agencies often use Eulerian models to investigate the potential impacts on pollutant deposition and air quality from changes in land use, anthropogenic and natural emissions, and climate. The Noah land surface model (LSM) in th...
Integrating multimedia models to assess nitrogen losses from the Mississippi River basin to the Gulf of Mexico
(JOURNAL) [Published : Nov 29, 2018]
This study describes and implements an integrated, multimedia, process-based system-level approach to estimating nitrogen (N) fate and transport in large river basins. The modeling system includes: 1) Community Multi-Scale Air Quality (CMAQ); 2) Water Research and Forecasting (WR...
Multigenerational Theoretical Study of Isoprene Peroxy Radical 1–5-Hydrogen Shift Reactions that Regenerate HOx Radicals and Produce Highly Oxidized Molecules
(JOURNAL) [Published : Jan 31, 2019]
A computational protocol is employed to glean new insight into the kinetics of several 1,5-hydrogen atom (H) shift reactions subsequent to first- and second-generation OH/O2 additions to isoprene. The M06-2X density functional was initially used with the Nudged Elastic Band (NEB)...
Exposure And Human Health Evaluation Of Airborne Pollution From The World Trade Center Disaster
(JOURNAL) [Published : Jul 12, 2002]
In the days following the September 11, 2001, terrorist attack on New York City's World Trade Center (WTC) towers, many Federal agencies, including the U.S. Environmental Protection Agency (EPA), were called upon to bring their technical and scientific expertise to the national e...
Modelling black carbon absorption of solar radiation: combining external and internal mixing assumptions
(JOURNAL) [Published : Jan 07, 2019]
An accurate simulation of the absorption properties is key for assessing the radiative effects of aerosol on meteorology and climate. The representation of how chemical species are mixed inside the particles (the mixing state) is one of the major uncertainty factors in the assess...
A new method for assessing the efficacy of emission control strategies
(JOURNAL) [Published : Feb 15, 2019]
Regional-scale air quality models and observations at routine air quality monitoring sites are used to determine attainment/non-attainment of the ozone air quality standard in the United States. In current regulatory applications, a regional-scale air quality model is applied for...
The potential effects of climate change on air quality across the conterminous US at 2030 under three Representative Concentration Pathways
(JOURNAL) [Published : Oct 29, 2018]
The potential impacts of climate change on regional ozone (O3) and fine particulate (PM2.5) air quality in the United States are investigated by downscaling Community Earth System Model (CESM) global climate simulations with the Weather Research and Forecasting (WRF) model, then ...
Do Changes in Temperature and Inflation Pressure Affect Rolling Resistance During Road and Track Testing for Fuel Economy of Class 8 Tractor-Trailers?
(JOURNAL) [Published : Apr 01, 2018]
Do Changes in Temperature and Inflation Pressure Affect Rolling Resistance During Road and Track Testing for Fuel Economy of Class 8 Tractor-Trailers?
A Maieutic Exploration of Nudging Strategies for Regional Climate Applications Using the WRF Model
(JOURNAL) [Published : Aug 15, 2018]
The use of nudging in the Weather Research and Forecasting (WRF) Model to constrain regional climate downscaling simulations is gaining in popularity because it can reduce error and improve consistency with the driving data. While some attention has been paid to whether nudging i...
Long-term evaluation of air sensor technology under ambient conditions in Denver, Colorado
(JOURNAL) [Published : Aug 08, 2018]
Air pollution sensors are quickly proliferating for use in a wide variety of applications, with a low price point that supports use in high-density networks, citizen science, and individual consumer use. This emerging technology motivates the assessment under real-world condition...
Can Air Quality Management Drive Sustainable Fuels Management at the Temperate Wildland-Urban Interface?
(JOURNAL) [Published : Sep 01, 2018]
Sustainable fire management has eluded all industrial societies. Given increasing wildfire events and magnitude, prescribed burning is promoted as the key to reducing fire hazard, but resultant smoke can adversely affect public health and compliance with air quality standards. Ho...
A Framework to Quantify the Strength of the Ecological Links Between an Environmental Stressor and Final Ecosystem Services
(JOURNAL) [Published : May 02, 2017]
Anthropogenic stressors such as climate change, fire, and pollution are driving shifts in ecosystem function and resilience. Scientists generally rely on biological indicators of these stressors to signal that ecosystem conditions have been altered beyond an acceptable amount. Ho...
Key Issues for Seamless Integrated Chemistry–Meteorology Modeling
(JOURNAL) [Published : Apr 10, 2018]
Online coupled meteorology–atmospheric chemistry models have greatly evolved in recent years. Although mainly developed by the air quality modeling community, these integrated models are also of interest for numerical weather prediction and climate modeling, as they can con...
The Southeast Atmosphere Studies (SAS): coordinated investigation and discovery to answer critical questions about fundamental atmospheric processes
(JOURNAL) [Published : Apr 19, 2018]
The Southeast Atmosphere Studies (SAS), encompassing the Southern Oxidant and Aerosol Study (SOAS), the Southeast Nexus of Air Quality and Climate (SENEX) study, the Nitrogen, Oxidants, Mercury and Aerosols: Distributions, Sources and Sinks (NOMADSS) study deployed in the field f...
A framework for expanding aqueous chemistry in the Community Multiscale Air Quality (CMAQ) model version 5.1
(JOURNAL) [Published : Apr 13, 2017]
This paper describes the development and implementation of an extendable aqueous-phase chemistry option (AQCHEM − KMT(I)) for the Community Multiscale Air Quality (CMAQ) modeling system, version 5.1. Here, the Kinetic PreProcessor (KPP), version 2.2.3, is used to generate a Rosen...
Characterizing the impact of projected changes in climate and air quality on human exposures to ozone
(JOURNAL) [Published : Jun 01, 2017]
The impact of climate change on human and environmental health is of critical concern. Population exposures to air pollutants both indoors and outdoors are influenced by a wide range of air quality, meteorological, behavioral, and housing-related factors, many of which are also i...
Projecting state-level air pollutant emissions using an integrated assessment model: GCAM-USA.
(JOURNAL) [Published : Dec 15, 2017]
Integrated Assessment Models (IAMs) characterize the interactions among human and earth systems. IAMs typically have been applied to investigate future energy, land use, and emission pathways at global to continental scales. Recent directions in IAM development include enhanced t...