atmospheric modeling Articles
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Aermod View - Working With Different Model Versions in Aermet View
With each successive update to the AERMOD modeling system published by the U.S. EPA to the Support Center for Regulatory Atmospheric Modeling (SCRAM) website, Lakes Software updates our AERMOD View and AERMET View applications to support the new models. In previous Modeling Tips, we’ve discussed how to choose earlier versions of the AERMOD executable in AERMOD View, but it is also possible ...
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An analysis of the meteorological and air quality conditions during an extreme ozone episode over the north-eastern USA
In this study, an extreme ozone episode that occurred during the period 12-15 July 1995 over the north-eastern United States is investigated through model simulations. This paper is focused on the meteorological conditions prevailing during this ozone episode. The analysis is based on nested grid simulations performed with the meteorological model CSU-RAMS (Colorado State University - Regional ...
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Cost 710: status report on working group 1, surface energy balance
This paper presents a brief summary of the work of working group 1 of COST Action 710, harmonisation in the pre-processing of meteorological data for dispersion modelling.Keywords: atmospheric dispersion models, modelling, meteorological data, surface energy balance, air pollution, environmental pollution, ...
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Urban boundary layer simulations of sea-breeze over Marseille during the ESCOMPTE experiment
Numerical simulations of the urban atmosphere of Marseille during the UBL/ESCOMPTE experiment that took place in June?July 2001 are presented. The atmospheric model is the SUBMESO version with grid-nesting, coupled to the urban soil model SM2U, with new parameterisations for sea surface and lateral boundary forcing. Urban characteristics are reproduced with a high degree of realism through a ...
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Simulation of the second ETEX release in the proximity of the source
The complexity of the weather situation during the second release of ETEX (European Tracer EXperiment) resulted in generally poor performances of the long-range dispersion models employed in the real time simulation of the release. On the other hand, much more detailed meteorological information than those available to the real time modellers were assembled in the course of the experiment and ...
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Dispersion modelling intercomparison exercise
In the framework of the "Fifth workshop Harmonisation within atmospheric dispersion modelling for regulatory purposes", a model intercomparison exercise was performed which aimed to assess (i) the environmental impact, and (ii) the compatibility of the performance of similar dispersion models under severe weather and topography conditions. The contributors were asked to use the same ...
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Practical use of the ISCST3 model to select monitoring site locations for air pollution control
We present an objective methodology for selection of the minimum number of sampling sites required to register the highest concentration values of air pollutants emitted from a continuous point source. The methodology is based on the analysis of 1-hour concentration values above a threshold value estimated by atmospheric dispersion models. The number and location of the air monitoring stations ...
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A 3-D wind and temperature pre-processor for ATD models
Many atmospheric transport and dispersion models, based on various approaches and applied to different spatial scales, need 3-D meteorological fields referred to regular grid systems. Data generally available, however, cannot be directly employed because of their irregularities, inconsistencies, insufficient spatial detail or inadequate terrain representation. To fill the gap between these input ...
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High-resolution analysis of the meteorological fields in the NW mountainous area of Greece
In this work, the nonhydrostatic mesoscale model MM5 was applied over the area of Epirus, Greece, using its nesting capabilities. Specifically, we used a multinest procedure in which the analysis of the inner grid was 1 x 1 km. The model was applied for a day characterised by inversion conditions and stagnation during which the air pollutants' concentrations were expected to increase. The ...
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Science and policy challenges of atmospheric modelling in consideration of health effects
Next generation atmospheric models are required to provide a realistic assessment of different types of chronic and acute environmental conditions and forecast the consequences on population health. These tasks were usually carried out with epidemiological studies, which are not adequate to indicate health effects. Therefore, models should be capable to carry out hazard identification, ...
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Evaluation of new generation atmospheric dispersion models
The paper considers the regulatory view of evaluating dispersion models. There is no proscription for regulatory studies in the UK, so differences between dispersion calculations from different models and versions of models are then as important as their absolute veracity. An example shows variations in calculated concentration due to variations between two different versions of a model and two ...
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Estimation of dry deposition of atmospheric nitrogen to coastal waters of de la Plata River in front of Buenos Aires city
The deposition of atmospheric nitrogen (N) to surface waters of de la Plata River downwind of Buenos Aires city has been estimated using atmospheric dispersion-deposition models. The CALPUFF model has been applied to point source emissions and the DAUMOD-RD model has been developed to evaluate the area source emission contributions. Annual N dry deposition is 31,763 kg-N yr−1 (≈ 18 kg-N km−2 ...
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On the urban aspect of the Copenhagen dataset
It was one of the findings from the model validation exercise during the third workshop 1994 in Mol that there was a common tendency for all models under consideration to underestimate the observed concentrations in the case of the Copenhagen dataset. It is argued here that this is due to the fact that this experiment was performed over a rough suburban surface. In such circumstances, a roughness ...
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Evaluation of CFD model predictions of local dispersion from an area source on a complex industrial site
The CFD model Fluidyn-Panache was configured to model atmospheric transport from an area source. Modelled flow and turbulence were evaluated by comparison with on-site meteorological measurements, whilst atmospheric dispersion was compared with wind tunnel measurements. The results showed that higher rates of vertical and lateral dispersion were modelled than were determined in the wind tunnel, ...
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Model evaluation of the Austrian Gaussian plume model ON M 9440: comparison with the Kincaid dataset
The Austrian Gaussian plume model ON M 9440 is evaluated with the Kincaid dataset using the workshop model validation kit. Results are shown for different meteorological options. Mean model concentrations compare well with or overestimate measured data, depending on the choice of these options.Keywords: Gaussian plume model, Kincaid data, model evaluation, plume rise, atmospheric dispersion ...
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A model evaluation exercise for non-buoyant releases from continuous point sources
A model of the dispersion of pollutants released from a continuous point source into the atmospheric boundary layer is suggested. For this model and for that of Gryning et al. (1987), the predicted normalised crosswind integrated concentrations are compared with observational data. The data obtained in diffusion experiments with a non-depositing tracer, in non-buoyant releases carried out at ...
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The 1998 IFDM evaluation with the model validation kit
A modification of the Immission Frequency Distribution Model (IDFM) can reproduce the Kincaid and Indianapolis arc-wise maximum ground-level concentrations (GLCs) and crosswind integrated concentrations (CWICs) fairly well. But we doubt whether these modifications are really an improvement of the description of the natural ambient atmospheric dispersion process, rather than merely fitting a ...
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Regulatory dispersion modelling in Finland
We present a review of regulatory atmospheric dispersion models and their application to environmental impact assessment (EIA) in Finland. The following regulatory models are available: the urban dispersion modeling system, models for dispersion of vehicular pollution, the air pollution information system, and the dispersion model for odorous compounds. All of these models are connected to a ...
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Sensitivity analysis of ozone long term simulations to grid resolution
In the frame of the CityDelta European modelling intercomparison, three different atmospheric chemistry transport models have been applied over the Milan area for a six-month summer simulation. To better evaluate the models' reliability and cleverness in simulating the long-term dynamics of pollutants in the atmosphere, a comprehensive sensitivity analysis with regard to all model configuration ...
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Calculation of the far range atmospheric transport of radionuclides after the Fukushima accident with the atmospheric dispersion model MATCH of the JRODOS system
The paper presents estimates of the far-range atmospheric dispersion of radionuclides after the accident at Fukushima Daiichi Nuclear Power Plant (NPP), obtained using the long-range atmospheric dispersion model MATCH. Software tools were developed to run MATCH in the EU nuclear emergency response system JRODOS using freely available numerical weather prediction (NWP) data of the Global ...
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