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  1. Book ; Online: The Lagrangian Atmospheric Radionuclide Transport Model (ARTM) – Sensitivity studies and evaluation using airborne measurements of power plant emissions

    Hanfland, Robert / Brunner, Dominik / Voigt, Christiane / Fiehn, Alina / Roiger, Anke / Pattantyús-Ábrahám, Margit

    eISSN:

    2023  

    Abstract: The Atmospheric Radionuclide Transport Model (ARTM) operates at the meso-γ-scale and simulates the dispersion of radionuclides originating from nuclear facilities under routine operation within the planetary boundary layer. This study presents the ... ...

    Abstract The Atmospheric Radionuclide Transport Model (ARTM) operates at the meso-γ-scale and simulates the dispersion of radionuclides originating from nuclear facilities under routine operation within the planetary boundary layer. This study presents the extension and validation of this Lagrangian particle dispersion model and consists of three parts: i) a sensitivity study that aims to assess the impact of key input parameters on the simulation results; ii) the evaluation of the mixing prop- erties of five different turbulence models using the well-mixed criterion; and iii) a comparison of model results to airborne observations of carbon dioxide (CO 2 ) emissions from a power plant and the evaluation of related uncertainties. In the sensitiv- ity study, we analyse the effects of stability class, roughness length, zero-plane displacement factor and source height on the three-dimensional plume extent as well as the distance between source and maximum concentration at the ground. The results show that the stability class is the most sensitive input parameter as expected. The five turbulence models are the default turbu- lence models of ARTM 2.8.0 and ARTM 3.0.0, one alternative built-in turbulence model of ARTM and two further turbulence models implemented for this study. The well-mixed condition tests showed that all five turbulence models are able to preserve an initially well-mixed atmospheric boundary layer reasonably well. The models deviate only 6 % from the expected uniform concentration below 80 % of the mixing layer height except for the default turbulence model of ARTM 3.0.0 with deviations by up to 18 %, respectively. CO 2 observations along a flight path in the vicinity of the lignite power plant Bełchatów, Poland measured by the DLR Cessna aircraft during the CoMet campaign in 2018 allow to evaluate the model performance for the different turbulence models under unstable boundary layer conditions. All simulated mixing ratios are in the same order of magnitude as the airborne in situ data. An extensive ...
    Subject code 551
    Language English
    Publishing date 2023-03-16
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book ; Online: Evaluation of simulated CO2 power plant plumes from six high-resolution atmospheric transport models

    Brunner, Dominik / Kuhlmann, Gerrit / Henne, Stephan / Koene, Erik / Kern, Bastian / Wolff, Sebastian / Voigt, Christiane / Jöckel, Patrick / Kiemle, Christoph / Roiger, Anke / Fiehn, Alina / Krautwurst, Sven / Gerilowski, Konstantin / Bovensmann, Heinrich / Borchardt, Jakob / Galkowski, Michal / Gerbig, Christoph / Marshall, Julia / Klonecki, Andrzej /
    Prunet, Pascal / Hanfland, Robert / Pattantyús-Ábrahám, Margit / Wyszogrodzki, Andrzej / Fix, Andreas

    eISSN: 1680-7324

    2023  

    Abstract: Power plants and large industrial facilities contribute more than half of global anthropogenic CO 2 emissions. Quantifying the emissions of these point sources is therefore one of the main goals of the planned constellation of anthropogenic CO 2 ... ...

    Abstract Power plants and large industrial facilities contribute more than half of global anthropogenic CO 2 emissions. Quantifying the emissions of these point sources is therefore one of the main goals of the planned constellation of anthropogenic CO 2 monitoring satellites (CO2M) of the European Copernicus program. Atmospheric transport models may be used to study the capabilities of such satellites through observing system simulation experiments and to quantify emissions in an inverse modeling framework. How realistically the CO 2 plumes of power plants can be simulated and how strongly the results may depend on model type and resolution, however, is not well known due to a lack of observations available for benchmarking. Here, we use the unique data set of aircraft in situ and remote sensing observations collected during the CoMet (Carbon Dioxide and Methane Mission) measurement campaign downwind of the coal-fired power plants at Bełchatów in Poland and Jänschwalde in Germany in 2018 to evaluate the simulations of six different atmospheric transport models. The models include three large-eddy simulation (LES) models, two mesoscale numerical weather prediction (NWP) models extended for atmospheric tracer transport, and one Lagrangian particle dispersion model (LPDM) and cover a wide range of model resolutions from 200 m to 2 km horizontal grid spacing. At the time of the aircraft measurements between late morning and early afternoon, the simulated plumes were slightly (at Jänschwalde) to highly (at Bełchatów) turbulent, consistent with the observations, and extended over the whole depth of the atmospheric boundary layer (ABL; up to 1800 m a.s.l. (above sea level) in the case of Bełchatów). The stochastic nature of turbulent plumes puts fundamental limitations on a point-by-point comparison between simulations and observations. Therefore, the evaluation focused on statistical properties such as plume amplitude and width as a function of distance from the source. LES and NWP models showed similar performance and ...
    Subject code 551
    Language English
    Publishing date 2023-02-27
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Urban working groups in the IAEA's model testing programmes: overview from the MODARIA I and MODARIA II programmes.

    Thiessen, Kathleen M / Boznar, Marija Zlata / Charnock, Thomas W / Chouhan, Sohan L / Federspiel, Lucia / Grašič, Boštjan / Grsic, Zoran / Helebrant, Jan / Hettrich, Sebastian / Hůlka, Jiří / Hwang, Won Tae / Kamboj, Sunita / Korolevych, Volodymyr / Kuča, Petr / Lee, Joeun / Mancini, Francesco / Mlakar, Primož / Patryl, Luc / Pattantyús-Ábrahám, Margit /
    Reisin, Tamir / Sdouz, Gert / Silva, Kampanart / Takahara, Shogo / Tay, Bee Kiat / Walter, Hartmut / Yankovich, Tamara / Yu, Charley

    Journal of radiological protection : official journal of the Society for Radiological Protection

    2022  Volume 42, Issue 2

    Abstract: The IAEA's model testing programmes have included a series of Working Groups concerned with modelling radioactive contamination in urban environments. These have included the Urban Working Group of Validation of Environmental Model Predictions (1988-1994) ...

    Abstract The IAEA's model testing programmes have included a series of Working Groups concerned with modelling radioactive contamination in urban environments. These have included the Urban Working Group of Validation of Environmental Model Predictions (1988-1994), the Urban Remediation Working Group of Environmental Modelling for Radiation Safety (EMRAS) (2003-2007), the Urban Areas Working Group of EMRAS II (2009-2011), the Urban Environments Working Group of (Modelling and Data for Radiological Impact Assessments) MODARIA I (2013-2015), and most recently, the Urban Exposures Working Group of MODARIA II (2016-2019). The overarching objective of these Working Groups has been to test and improve the capabilities of computer models used to assess radioactive contamination in urban environments, including dispersion and deposition processes, short-term and long-term redistribution of contaminants following deposition events, and the effectiveness of various countermeasures and other protective actions, including remedial actions, in reducing contamination levels, human exposures, and doses to humans. This paper describes the exercises conducted during the MODARIA I and MODARIA II programmes. These exercises have included short-range and mid-range atmospheric dispersion exercises based on data from field tests or tracer studies, hypothetical urban dispersion exercises, and an exercise based on data collected after the Fukushima Daiichi accident. Improvement of model capabilities will lead to improvements in assessing various contamination scenarios (real or hypothetical), and in turn, to improved decision-making and communication with the public following a nuclear or radiological emergency.
    MeSH term(s) Computer Simulation ; Humans ; Models, Theoretical ; Radiation Monitoring ; Radioactivity ; Safety Management
    Language English
    Publishing date 2022-02-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 639411-5
    ISSN 1361-6498 ; 0952-4746
    ISSN (online) 1361-6498
    ISSN 0952-4746
    DOI 10.1088/1361-6498/ac5173
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Nonuniversal atmospheric persistence: different scaling of daily minimum and maximum temperatures.

    Pattantyús-Abrahám, Margit / Király, Andrea / Jánosi, Imre M

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2004  Volume 69, Issue 2 Pt 1, Page(s) 21110

    Abstract: An extensive investigation of 61 daily temperature records by means of detrended fluctuation analysis has revealed that the value of correlation exponent is not universal, contrary to earlier claims. Furthermore, statistically significant differences are ...

    Abstract An extensive investigation of 61 daily temperature records by means of detrended fluctuation analysis has revealed that the value of correlation exponent is not universal, contrary to earlier claims. Furthermore, statistically significant differences are found for daily minimum and maximum temperatures measured at the same station, suggesting different degrees of long-range correlations for the two extremes. Numerical tests on synthetic time series demonstrate that a correlated signal interrupted by uncorrelated segments exhibits an apparently lower exponent value over the usual time window of empirical data analysis. In order to find statistical differences between the two daily extreme temperatures, high frequency (10 min) records were evaluated for two distant locations. The results show that daily maxima characterize better the dynamic equilibrium state of the atmosphere than daily minima, for both stations. This provides a conceptual explanation why scaling analysis can yield different exponent values for minima and maxima.
    Language English
    Publishing date 2004-02
    Publishing country United States
    Document type Journal Article
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.69.021110
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Dynamics of passive tracers in the atmosphere: laboratory experiments and numerical tests with reanalysis wind fields.

    Jánosi, Imre M / Kiss, Péter / Homonnai, Viktória / Pattantyús-Ábrahám, Margit / Gyüre, Balázs / Tél, Tamás

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2010  Volume 82, Issue 4 Pt 2, Page(s) 46308

    Abstract: Laboratory and numerical experiments are reported on dye advection processes in geostrophic turbulence. The experimental setup is the classical rotating annulus with differential heating which mimics the most essential features of midlatitude atmospheric ...

    Abstract Laboratory and numerical experiments are reported on dye advection processes in geostrophic turbulence. The experimental setup is the classical rotating annulus with differential heating which mimics the most essential features of midlatitude atmospheric flow. The main control parameter is the temperature contrast. Fluorescent dye is used as passive tracer, and dispersion is evaluated by digital image processing. The results are compared with tracer dispersion computations which are performed by means of global reanalysis wind fields at the pressure height of 500 hPa covering a time interval of one year. Apart from initial transient periods, the characteristic behavior for intermediate time scales is ballistic dispersion in both systems, where the zonal extent of the tracer cloud increases linearly in time (Batchelor scaling). The long-time evolution cannot be followed by the experimental technique, however, the numerical tests suggest a slower diffusive dispersion (Taylor regime) after 70-80 revolutions (days), in agreement with expectations. Richardson-Obukhov scaling (superdiffusion with an exponent value of 3/2) is neither observed in the laboratory nor in the numerical tests. Our findings confirm recent experimental results on the classic prediction by Batchelor that the initial pair separation is an essential parameter of the subsequent time evolution of tracers.
    Language English
    Publishing date 2010-10
    Publishing country United States
    Document type Journal Article
    ISSN 1550-2376
    ISSN (online) 1550-2376
    DOI 10.1103/PhysRevE.82.046308
    Database MEDical Literature Analysis and Retrieval System OnLINE

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