2 edition of Evaluation of short-term NO2 plume models for point sources found in the catalog.
Evaluation of short-term NO2 plume models for point sources
Mark A Yocke
by U.S. Environmental Protection Agency, Environmental Sciences Research Laboratory, Center for Environmental Research Information, [distributor in Research Triangle Park, NC, Cincinnati, OH
Written in English
|Other titles||Evaluation of short-term N.O.2 plume models for point sources|
|Statement||M.A. Yocke ... [et al.]|
|Contributions||Environmental Sciences Research Laboratory|
|The Physical Object|
|Pagination||3 p. ;|
Legislative actions regarding ozone pollution use air quality models (AQMs) such as the Community Multiscale Air Quality (CMAQ) model for scientific guidance, hence the evaluation of AQM is an important subject. Traditional point-to-point comparisons between AQM outputs and physical observations can be uninformative or even misleading since the two datasets are generated by discrepant. 1 EHS COURSE SYLLABUS ATMOSPHERIC TRANSPORT AND TRANSFORMATIONS OF AIRBORNE CHEMICALS Tuesday and Thursday: am, CHS , Winter
The national-scale air toxics assessment (NATA) is EPA's ongoing comprehensive evaluation of air toxics in the U.S. EPA developed the NATA as a state-of-the-science screening tool for State/Local/Tribal Agencies to prioritize pollutants, emission sources and locations of interest for further study, in order to gain a better understanding of the. The ISCST3 algorithm is based on a Gaussian plume dispersion model (i.e. it solves the steady-state Gaussian plume equation) and calculates short-term pollutant concentrations from multiple point sources at a specified receptor grid on a level or gently sloping terrain. A.
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Get this from a library. Evaluation of short-term NO2 plume models for point sources: volumes 1 and 2. [Mark A Yocke; Environmental Sciences Research Laboratory.]. Mark A Yocke has written: 'Evaluation of short-term NO2 plume models for point sources' -- subject- s -: Mathematical models, Air, Pollution Asked in Taxes and Tax Preparation Short term sources.
Gaussian-plume models 11 Common features of Gaussian-plume models 13 Meteorological data requirements 13 AUSPLUME and ISCST3 13 AERMOD 14 CTDMPLUS 14 Limitations of Gaussian-plume models 15 Advanced dispersion models 16 CALPUFF 18 TAPM 19File Size: 2MB.
A general plume dispersion model (GPDM) for a point source emission, based on Gaussian plume dispersion equation, was developed. The program complex was. 3 Reactive plume models 33 Numerical chemical kinetics equation solvers 34 FACSIMILE 35 Master chemical mechanism 35 UKCA, ASAD and the Met Office’s Unified Model 35 Chemistry in ADMS and ADMS-Urban models 37 Generic Reaction Set 37File Size: KB.
Evaluation of roadway Gaussian plume models with large-scale measurement campaigns Article (PDF Available) in Geoscientific Model Development Discussions 5(4).
The evaluation results are discussed in the document, "Evaluation of Short-Term Long-Range Transport Models." For the time being, long range and mesoscale transport models must be evaluated for regulatory use on a case-by-case basis.
– Short-term models – for a few hours to a few days; worst case episode conditions – Long-term models – to predict seasonal or annual average concentrations; health effects due to exposure • Classified by – Non-reactive models – pollutants such as SO 2 and CO – File Size: 4MB.
Page ACCuliicY Alto tJNCERTAINTY OF MODELS Dicussion Overview of Model Uncertainty Studies of Model Accuracy Use of Uncertainty in Decision-Making Evaluation of Models Recommendations REGULATORY APPLICATION OF MODELS Discussion Recommendations Analysis.
Contained within EDMS Steady-State Gaussian Plume Any relatively stable, primary pollutant (e.g., CO, TSP, PM, PM10), SO2, NO2 Full conversion, ARM/ARM2, OLM and PVMRM Point, area, volume Yes 10 m - 20 km 1 hr - 1 year (multi-year possible) averaging times CALPUFF On EPA's Preferred / Recommended List Used as an alternative to AERMOD.
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Based on two recent publications using Lagrangian dispersion models to simulate NO–NO 2 –O 3 chemistry for industrial plumes, a similar modified approach was implemented using GRAL-C (Graz Lagrangian Model with Chemistry) and tested on two urban applications. In the hybrid dispersion model GRAL-C, the transport and turbulent diffusion of primary species such as NO and NO 2 are treated in Cited by: It is a Gaussian plume model for point, area, line and vehicular traffic sources.
It includes plume penetration of inversions aloft, building effects, NOx chemistry and it can handle street canyons. It does not include wet or dry deposition, complex atmospheric chemistry, or the effects of complex terrain.
SUMMARY DESCRIPTIONS OF ALTERNATIVE AIR QUALITY MODELS Introduction and Availability We have provided a list of compendia for preferred/recommended refined air dispersion models in Appendix A of the Guideline on Air Quality Models (Appendix W of 40 CFR Part 51), hereafter, atively, in this document is a compendium of refined air quality.
Near-source in-plume aircraft based measurement field studies provide an opportunity for evaluating model estimates of (near-source) downwind transport and chemical impacts from single stationary point sources.
21 Photochemical grid model source apportionment and source sensitivity simulation of a single source downwind impacts compare well. Air pollution dispersion models can be used for calculating pollutant concentrations at any given point in the impact zone under study.
However, concentration of pollutants is influenced by the meteorology of the region. Hence, the actual impact zone of pollutant concentration may be different from the zone identified based on emissions by: This article presents the theoretical motivation, implementation approach, and example validation results for a computationally efficient plume simulation model, designed to replicate both the short-term time signature and long-term exposure statistics of a chemical plume evolving in a turbulent flow.
Within the resulting plume, the odor concentration is intermittent with rapidly changing Cited by: Historical development Origins.
The strategic management discipline originated in the s and s. Among the numerous early contributors, the most influential were Peter Drucker, Philip Selznick, Alfred Chandler, Igor Ansoff, and Bruce Henderson.
The discipline draws from earlier thinking and texts on 'strategy' dating back thousands of years. Prior tothe term "strategy" was. sources, may encounter particulate pollution that would be adequately characterized by measurements of this spatial scale.
Middle scale PM 10 measurements can be appropriate for the evaluation of possible short-term exposure public health effects.
In many situations. Compilation of atmospheric dispersion models. Atmospheric dispersion models are computer programs that use mathematical algorithm s to simulate how pollutant s in the ambient atmosphere disperse and, in some cases, how they react in the atmosphere.
The dispersion models are used to estimate or to predict the downwind concentration of air pollutant s emitted from sources such as industrial.
Thermal plume rise is covered parametrically. Emission sources are defined in form of point, line, area, and volume sources. Meteorology (wind direction, wind speed, stability class or Monin-Obukhov length) is provided in form of a time series of hourly means or in form of a dispersion class statistics.The predominant short-term transformation process is the reaction of nitric oxide with ambient ozone to form nitrogen dioxide: NO2+ O2 () NO + O3 Since the reaction is a 1 to 1 transformation that does not affect total NOx concentrations, the maximum extent of conversion of NO to NO2 that can be expected in the emission plume is directly.Simple models have been developed by Benesh () and Messina et al.
() to simulate pollutant concentrations at urban intersections. These models incorporate modified Gaussian plume equations to try to reproduce concentration fields in complex settings. The errors in simulated short-term concentrations can be large (Rao ).Cited by: 8.