Atmospheric Modeling Articles
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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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Local PM10 source apportionment for non-attainment areas in Slovakia
The method used for the PM10 source apportionment in 18 air quality management areas (AQMAs) in Slovakia is presented, as well as the results of the study. Local PM10 emissions include traffic emissions, local seasonal heating sources from residential housing, industrial and point sources, and fugitive sources. Mathematical modelling has been performed using CALPUFF model, driven by ...
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Towards a new scheme for parametrisation of deep convection in NAME III
This paper describes an updated scheme for parametrisation of atmospheric convection to be used in the Met Office Atmospheric Dispersion Model (NAME III). In this scheme, the vertical transport of particles due to convection is represented in a 1-dimensional model based on a ‘mass-flux’ approach. Empirical formulas are used to obtain the mass fluxes and the convective precipitation is used for ...
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CFD modelling for atmospheric pollutants/aerosols studies within the complex terrains of urban areas and industrial sites
Computational fluid dynamic (CFD) modelling of pollution dispersion and chemical conversion to aerosol particles in the atmospheric boundary layer (ABL) has been studied. The investigation focused on the numerical modelling above complex orographic terrains of urban areas and industrial sites including the dispersion of toxic substances in the air as a result of accidents. A finite-rate model of ...
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Understanding and Managing the Effects of Climate Change on Aquatic Ecosystems
There is mounting evidence that climate-changeinduced extreme events are expected to adversely affect the aquatic ecosystems and ecosystem services that they provide. To address this need to understand how climate, aquatic ecological, and social systems interact and how to manage these coupled systems, LimnoTech is participating with a large team of researchers (from Stanford University, the ...
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Implementation of a two-way coupled atmospheric-hydrological system for environmental modeling at regional scale
This work describes the two-way coupling performed between the regional atmospheric model Brazilian Regional Atmospheric Modeling System (BRAMS) and the hydrological model MGB-IPH. As a first step of the atmosphere-hydrology coupling, only the water balance variables were coupled. Differences in temporal and spatial scales between MGH-IPH and BRAMS were analyzed. By default, MGB-IPH has a daily ...
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White Paper: Managing Odour Complaints Best Practices
There are many ways to deal with Odour complaints, either proactively or reactively. Odours are not predictable, but you can manage them, if you receive a complaint. Here are some suggestions: Encourage odour complainants to notify the plant as soon as possible after an odour episode and fill out a standard questionnaire with details about the odour episode such as date, time, ...
By ORTECH
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Numerical simulation of the impact of street geometry on vehicle emissions in urban area
Keeping the street geometry acceptable in an urban area has become an important task to improve the air quality. Gaseous emissions from vehicles increase the incidence of a variety of human health problems. This study presents a numerical simulation of the effect of street geometry on the dispersion of vehicular pollutants in an urban area using various types of k-ε turbulence models, i.e., a ...
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Recent advancements in numerical modelling of flow and dispersion in urban areas: a short review
This paper reviews recent findings in the field of flow and pollutant dispersion modelling around buildings and within complex urban geometries. Complexity is not only associated to the packing density of buildings, but originates also from building-height variability, buoyancy effects close to the building walls, traffic-produced turbulence and from the presence of vegetation. Recent results ...
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European Union CO2 emissions: different accounting perspectives
The aim of this technical report is to explain to a wider audience the concepts and methodologies behind different air emission accounting perspectives and the resulting emissions data at the EU level. In brief, there are three of these different accounting perspectives: territorial, production and consumption. Three perspectives on air emissions The territorial perspective considers emissions ...
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Downscaling technique to estimate hydrologic vulnerability to climate change: an application to the Conchos River Basin, Mexico
The Intergovernmental Panel on Climate Change (IPCC) suggests that vulnerability to climate change depends on three main factors: exposure, sensitivity and adaptive capacity. Each factor was evaluated in a hydrologic context, for instance exposure was interpreted as a change in surface runoff. Factors were combined using a Geographic Information System (GIS) and an overall methodology to map ...
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Parsing pyrogenic PAHs: Forensic chemistry, receptor models, and source control policy
A realistic understanding of contaminant sources is required to set appropriate control policy. Forensic chemical methods can be powerful tools in source characterization and identification, but they require a multiple‐lines‐of‐evidence approach. Atmospheric receptor models, such as EPA's Chemical Mass Balance (CMB), are increasingly being used to evaluate sources of pyrogenic polycyclic ...
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ADMS 5 Buildings Validation Warehouse Fires Wind Tunnel Experiments
1 Introduction In 1996. results from the CERC Atmospheric Dispersion Model. ADMS 2 were validated against experimental wind tunnel data of dispersion from chemical warehouse fires [1]. The original experimental data used to validate the model were presented in a Building Research Establishment Client Report [2]. Here, results from ADMS 5.0 (version 5.0.0.0) are validated against these ...
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ADMS 5 Flat Terrain Validation Kincaid, Indianapolis and Prairie Grass
1 Introduction This document presents a summary of ADMS model results compared against three well known field data sets: Prairie Grass. Kincaid and Indianapolis. Results are also presented for two U.S. models: ISCST and AERMOD. ISC ST is the United States Environmental Protection Agency model. It is a so-called 'old generation' model, similar to the UK R-91 model, based on the 1970's ...
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A Canadian viewpoint on data, information and uncertainty in the context of prediction in ungauged basins
The quality (i.e. the degree of uncertainty that results from the interpretation and analysis) of information dictates its value for decision making. There has been much progress towards improving information on the water budgets of ungauged basins by improving knowledge, tools and techniques during the Prediction in Ungauged Basins (PUB) initiative. These improvements, at least in Canada, have ...
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The impact of international shipping on European air quality and climate forcing
Due to its dependence on fossil fuel combustion and the fact that it is one of the least regulated anthropogenic emission sources, emissions from the marine transport sector contribute significantly to air pollution and climate change. The main objective of this report is to provide a comprehensive review of recent literature and reports, taking into account expert knowledge, on the maritime ...
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A simple methodology for surface layer characterization during diabatic extremes
Abstract Increased global environmental awareness has fostered widespread use of remote automated weather station (RAWS) networks to monitor meteorological conditions, and reliance on atmospheric dispersion modeling for decisions concerning pollutant dispersion. Dispersion models require as input a characterization of surface layer (SL) heat and momentum fluxes and turbulence. Characterization ...
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ADMS–Urban: developments in modelling dispersion from the city scale to the local scale
Many countries perform national air quality assessments using grid–based numerical air dispersion models, generally referred to as 'regional' models. Advantages of these models include the ability to use temporally and spatially varying meteorology and model chemical reactions over large temporal and spatial scales. These models usually perform reasonably well against rural and urban background ...
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Calculations of external irradiation from radioactive plume in the early stage of a nuclear accident
A mathematical method for real–time calculations of cloudshine doses/dose rates used for purposes of online assimilation of model predictions with observations incoming from terrain is proposed. Model predictions of cloudshine doses have to be calculated simultaneously in an array of positions located on terrain around a nuclear facility. A modification of the classical straight–line Gaussian ...
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Estimates of lateral dispersion parameters in low wind speed conditions
Wind speed time series recorded during stable low wind speed conditions are typically non–stationary, with large horizontal oscillations, commonly known as meandering. In this paper, two wavelet–based methods are proposed to obtain lateral dispersion coefficients from such time series. These methods, associated with a specific wind model, have been tested by using wind velocities recorded, with ...
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