Showing results for: air quality modeling Articles
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ALL4 Air Quality Modeling Update
As it’s been over a year since my last air quality modeling-related 4TR article, I thought it appropriate to provide a general status report on the air quality modeling updates that have occurred over the last year. There are a number of items that warrant discussion around their updates and the potential impacts on the regulated community, specifically: A new version of U.S. ...
By All4 Inc.
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Methodology for a comparative evaluation of two air-quality models
This paper presents a methodology for conducting an objective comparative evaluation of two air-quality models using several datasets. This methodology is designed to be simple to implement and understand, to reliably discern improvement in performance, and to accommodate the use of datasets from a variety of field studies of varying quality. The reliability of the comparison is enhanced by the ...
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Developing a fast photochemical calculator for an integrated assessment model
The use of integrated assessment models, in air quality policy, which combines atmospheric models with others from different fields, raises the need of developing specific air quality modelling concepts. The air quality model, AUSTAL2000–AYLTP uses an adapted version of AUSTAL2000 model to calculate transport coupled with a fast photochemical module. Two approaches are compared: one using a ...
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CAMxRunner: a modular framework for efficient chemical transport modelling
Since many political decisions concerning air quality are based on models, modelling reproducibility and quality assurance are of interest to a wide audience. We developed a modular computer program called CAMxRunner to address this need. CAMxRunner automates runs of the Comprehensive Air quality Model with extensions (CAMx) including pre– and post–processing. Except for the ...
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Comparative evaluation of two air quality models: within-regime evaluation statistic
At the Workshop on Operational Short-Range Atmospheric Dispersion Models for Environmental Impact Assessment in Europe, Lee and Irwin (1994) presented a methodology for conducting an objective comparative evaluation of two or more air quality models. The methodology involved the use of bootstrap resampling to allow computation of confidence bounds on model comparison measures, and an inverse ...
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Numerical experiments to determine MM5/WRF–CMAQ sensitivity to various PBL and land–surface schemes in north–eastern Spain: application to a case study in summer 2009
The Community Multiscale Air Quality (CMAQ) model was used along with the Weather Research and Forecasting (WRF) model to study air quality modelling sensitivity to various Planetary Boundary Layer (PBL) schemes and Land Surface Models (LSMs). The performance is assessed and quantified by comparing results with surface observations and the outputs provided by the fifth generation Mesoscale Model ...
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Managing air quality during regulatory changes
This paper discusses the regulatory and technical issues associated with the revisions to the US EPA Guideline on Air Quality Models. The proposed guideline includes the models AERMOD, CALPUFF, and ISC-PRIME, all of which contain significant technical improvements over prior models. Differences in modelling requirements are appearing as regulatory agencies and industries use technically superior ...
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Sensitivity of the AERMOD air quality model to the selection of land use parameters
AERMOD is a new, advanced plume dispersion model that the U.S. Environmental Protection Agency (EPA) is expected to propose for regulatory use. It is intended to replace ISCST3 for most modeling applications. AERMOD is the result of an effort to incorporate scientific knowledge gained over the last three decades into regulatory plume models. AERMOD requires, as input, three site-specific land use ...
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The sustainable development of Heathrow Airport: model inter-comparison study
Air quality modelling near airports has received attention due to the impact of emissions from aircrafts near ground level. This work is part of the model inter-comparison study undertaken for the Department of Transport in connection with air quality near Heathrow Airport. Results formed part of a submission to the UK government in July 2006. The Emissions and Dispersion Modelling System (EDMS) ...
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ADMS and ADMS-Urban
ADMS and ADMS-Urban are new generation air quality models that are easy to use and attractively presented. They run on a PC under Windows and are suitable for modelling of industrial and urban dispersion problems for comparison with limits, planning, and 'what if' scenarios. Each model can be linked to a GIS (geographical information system) for simple entry of sources and clear presentation of ...
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Performance criteria for the benchmarking of air quality model regulatory applications: the 'target' approach
The definition of appropriate performance criteria is one of the key issues for the benchmarking of air quality models in regulatory applications. As part of the FAIRMODE benchmarking activities (Thunis et al., 2010), suitable criteria for air quality modelling in the frame of the EU air quality directive (AQD) 2008 are proposed and tested. The suggested approach builds on the target indicator ...
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Effects of nocturnal thermal circulation and boundary layer structure on pollutant dispersion in complex terrain areas: a case study
For air quality models, it is important that the meteorological fields derived from meteorological models reflect the best characterisation of the atmosphere. Under strongly thermally–stratified conditions, the determining factors are turbulent kinetic energy and surface layer parameterisations. In this study, the 5th generation Mesoscale Model (MM5) and the Weather Research and Forecasting ...
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`Revising Louisiana State Air Quality Modeling Guidance for the Incorporation of AERMOD,` presented at the 2006 A&WMA annual conference
Abstract For over two decades, the Industrial Source Complex (ISC) dispersion model has been the primary model used to predict ambient air impacts from stationary sources. Recent advances in dispersion modeling theory have resulted in the creation of a new type of modeling algorithm referred to as the American Meteorological Society/U.S. Environmental Protection Agency Regulatory Modeling System ...
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A mesoscale study of the impact of industrial emissions by using the MM5-CMAQ modelling system
The scientific interest in improving the air quality tools that provide a detailed description – source oriented – of atmospheric processes and the impact of specific large industrial emission points is growing. This paper describes the results of using a state-of-the-art third-generation air quality modelling system (MM5-CMAQ) over a pilot test industrial site in the Madrid mesoscale domain. The ...
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Developments in ADMS-Airport to take account of near field dispersion and applications to Heathrow Airport
ADMS-Airport is based on the ADMS-Urban system for modelling urban air quality. In the near field it employs a quasi-Gaussian dispersion model and this is nested within a trajectory model. Aircraft sources are treated explicitly as accelerating jets. Application of the model to air quality calculations was conducted for the Model Inter-Comparison (MIC) Study of Project for the Sustainable ...
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Current trends in the use of models for source apportionment of air pollutants in Europe
Forum for Air Quality Modelling in Europe (FAIRMODE) sub–group 2 (SG2) on the 'Contribution of natural sources and source apportionment' has been formed in response to the need for a harmonised European approach in the use of models for source apportionment, addressing the requirements of the current Air Quality Directive 2008/50/EU. Within SG2, a review was performed on source apportionment ...
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U.S. EPA Releases 1-Hour NO2 NAAQS Modeling Guidance
The U.S. EPA Air Quality Modeling Group (AQMG) recently released a new guidance document for NO2 modeling. The document outlines procedures that can be used to calculate the NO2 design values for comparison to the new 1-hour NO2 National Ambient Air Quality Standard (NAAQS). The new 1-hour NO2 standard of 100 ppb goes into effect on April 12, 2010. This 1-hour NO2 standard is based on the ...
By All4 Inc.
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Evaluation of WRF model performance in different European regions with the DELTA–FAIRMODE evaluation tool
One–year (2006) WRF model simulations performed at a European scale and ECMWF–IFS forecasts are compared with 10 m wind speed and 2 m temperature observations from around 1,200 surface stations. A statistical evaluation on the modelled meteorological fields is performed using the DELTA software, developed in the framework of FAIRMODE, the forum for air quality modellers relevant to the ...
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How health related issues are likely to drive dispersion modelling over the next decade
In the future, the focus of dispersion modelling may centre on the aggregation of sources, atmospheric chemical reactions and longer range transport. This will put greater emphasis on the use of assimilated meteorological data as models are used to assess public policy options to minimise the impacts of air pollutants on human health and welfare. Because of the international nature of threats, ...
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A comparison between IECM and IEM Lagrangian models
A three-dimensional Lagrangian stochastic model to evaluate pollutant dispersion in terms of both mean and fluctuating concentration fields has been developed. The mean concentration field is predicted by using a macromixing model, while the micromixing scheme IECM (Interaction by Exchange with the Conditional Mean) is adopted to determine the moments of concentration. The results agree with ...
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