atmospheric boundary layer Articles

  • Marine atmospheric boundary-layer height estimated from NWP model output

    The application of the bulk Richardson number approach to determine the height of the marine atmospheric boundary layer from standard output of Numerical Weather Prediction models is discussed. It is argued that over smooth surfaces like the sea, the critical Richardson number can be expected to be smaller than over land. Based on 4 days of intensive measurements of the height of the marine ...


    By Inderscience Publishers

  • Verification of the meteorological pre-processor MEPDIM

    The Norwegian Institute for Air Research (NILU) has carried out a year of direct measurements of standard deviations of wind fluctuations (σv and σw) on an island off the west coast of Norway. These measurements have been used for the evaluation of estimated values based on the meteorological pre-processor MEPDIM. The physical basis for this metprocessor is provided by parameterisation ...


    By Inderscience Publishers

  • On the estimation of overwater buoyancy length from routine measurements

    The stability parameter (z/L, where z is the height and L the buoyancy length) is an essential parameter in atmospheric boundary layer studies. From routine measurements, the bulk Richardson number (Rb) is usually computed. On the basis of appropriate field measurements at sea, it is shown that z/L = A Rb where A = 10.2 (with R 2 = 0.97) for unstable and 6.3 (with R 2 = 0.97) for stable ...


    By Springer-Verlag GmbH

  • Tritium dispersion simulation in the atmosphere by the integral transform technique using micrometeorological parameters generated by large eddy simulation

    In this work, we report a numerical and statistical comparison between Advection-Diffusion Multilayer Method (ADMM) and Generalised Integral Laplace Transform Technique (GILTT) approaches to simulate a radioactive pollutant dispersion in the Atmospheric Boundary Layer (ABL) using micrometeorological parameters generated by Large Eddy Simulation (LES). To better describe the wind profile of the ...


    By Inderscience Publishers

  • On wind velocity profiles over urban area

    The horizontally homogeneous atmospheric boundary layer over rough surface with a large roughness length z0 is introduced to model the simplest cases of the Urban Planetary Boundary Layer (UABL) over the flat plain. The system of the equations of motion was non-dimensionalised and it has been demonstrated that the Rossby number similarity exists for the core of the UABL. That means that the ...


    By Inderscience Publishers

  • Simple model of the Urban Atmospheric Boundary Layer (UABL)

    The horizontally homogeneous atmospheric boundary layer over a rough surface with a large roughness length z0 has been investigated to model the simplest cases of the Urban Atmospheric Boundary Layer (UABL) over a flat plain. It has been demonstrated that the nondimensional profiles of the horizontal Reynolds stresses of eddy viscosity and of velocity defect components are universal and ...


    By Inderscience Publishers

  • Evaluation of the influence of micrometeorological data on concentration estimates

    A dispersion model for continuous releases of pollutants in the atmospheric boundary layer is applied to study the influence on modelled concentrations of different estimates of the key micrometeorological variables that represent the dispersion processes. The modelling approach is based on the advection-diffusion equation and includes profiles of wind and eddy diffusivity for the entire ...


    By Inderscience Publishers

  • Local scale PC-oriented Eulerian pollutant transport model PolTran-1-2

    A one-dimensional non-stationary numerical Atmospheric Boundary Layer (ABL) model is combined with an Eulerian advective scheme, called TRAP. The input information includes meteorological measurements at the surface and high level information from weather forecast centres. The Boundary Layer model includes a comprehensive set of equations governing the meteorological processes (momentum, ...


    By Inderscience Publishers

  • Verification of SBL models by mobile SODAR measurements

    Models of atmospheric pollutant transport need information about the structure of the atmospheric boundary layer (ABL). The most important characteristics for such applications are the parameterisation of the stable boundary layer (SBL) and the mixing layer height (MLH). Recently, many different schemes have been employed to calculate the SBL height, but there are many problems with applying ...


    By Inderscience Publishers

  • Modelling and measurements of the atmospheric boundary layer in Sofia, Bulgaria

    The evaluation of mesoscale model simulations against experimental data on the vertical profiles of mean meteorological parameters and surface turbulent momentum and heat fluxes for Sofia, Bulgaria, is presented. The simulation of the vertical profiles is currently a weak point in mesoscale modelling, and needs investigation in view of the numerous practical applications.Keywords: Bulgaria, ...


    By Inderscience Publishers

  • On the consideration of mesoscale transports in climate modelling

    The dynamical effect of land surface heterogeneity on heat fluxes in the atmospheric boundary layer (ABL) is investigated using numerical simulations with a nonhydrostatic model over a wide range of grid resolutions. It is commonly assumed that mesoscale or dynamical fluxes associated with mesoscale and convective circulations simulated by a high-resolution model (subgrid (SG) model) on the ...


    By Springer-Verlag GmbH

  • Influence of stable atmospheric thermal stratification on urban street-canyon re-aeration

    To assist validation of numerical models of urban pollution dispersion, the boundary layer (BL) developing above a model town and the dispersion of street-level pollution on the surrounding buildings in typical street-canyon geometries, have been investigated in a wind tunnel under both neutral and stable thermal stratification conditions. Different street aspect ratios and roof configurations ...


    By Inderscience Publishers

  • Air dispersion modelling for individual exposure studies

    The concentration fluctuations of a dispersing hazardous gaseous pollutant in the atmospheric boundary layer, and the hazard associated with short–term concentration levels, demonstrate the necessity of estimating the magnitude of these fluctuations using predicting models. To predict and estimate the maximum expected dosage and the exposure time within which the dosage exceeds certain health ...


    By Inderscience Publishers

  • An investigation of the urban heat island of Rome through a canyon–based subgrid scheme

    This paper describes some modifications to a mesoscale model surface scheme to better account for urban heat–storage. The approach involves integrating the Subgrid Town Energy Budget (STEB) with the Regional Atmospheric Modelling System (RAMS). The integrated system has been applied to the investigation of the Urban Heat Island (UHI) of Rome, Italy, and the surrounding area (Lazio Region), ...


    By Inderscience Publishers

  • Modelling the influence of dimethyl sulphide on aerosol production in the marine boundary layer

    It has been postulated that dimethyl sulphide (DMS) emissions from the oceans can produce new condensation nuclei and eventually cloud condensation nuclei. Thus, DMS may have a significant influence on the Earth's radiation budget. A study of this postulate has been conducted for marine boundary layer conditions using a newly developed chemistry–aerosol–cloud (CAC) modelling system. The CAC ...


    By Inderscience Publishers

  • 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 ...


    By Inderscience Publishers

  • Evaluation of the Gaussian puff model based on measurements

    Concentrations calculated with the Gaussian puff model have been compared with measurements obtained from the dispersion experiments conducted at Lillestrom, Copenhagen, and Kincaid. The following dispersion parameters were used in the Gaussian puff model: Pasquill-Gifford, Briggs, Brookhaven and OML. Comparisons of the calculated and measured values of the concentrations have been carried out ...


    By Inderscience Publishers

  • 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 ...


    By Inderscience Publishers

  • Meteorological simulations with use of satellite data for assessing urban heat island under summertime anticyclonic conditions

    The aim of this study was to investigate the formation, evolution and evaluation of topography effects on the urban heat island over the city of Zagreb. For this purpose, the non-hydrostatic mesoscale meteorological model MEMO was used and high-resolution simulations were carried out for two summertime anticyclonic periods. Satellite data were used to improve the model's performance. The ...


    By Inderscience Publishers

  • 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 ...


    By Inderscience Publishers

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