Open AccessNumerical simulations of atmospheric dispersion of iodine-131 by different models
Author(s) -
Ádám Leelőssy,
Róbert Mészáros,
Attila Kovács,
István Lagzi,
Tibor Kovács
Publication year - 2017
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0172312
Subject(s) - hysplit , atmospheric dispersion modeling , meteorology , environmental science , dispersion (optics) , atmosphere (unit) , atmospheric sciences , weather research and forecasting model , troposphere , plume , wind speed , aerosol , air pollution , physics , chemistry , organic chemistry , optics
Nowadays, several dispersion models are available to simulate the transport processes of air pollutants and toxic substances including radionuclides in the atmosphere. Reliability of atmospheric transport models has been demonstrated in several recent cases from local to global scale; however, very few actual emission data are available to evaluate model results in real-life cases. In this study, the atmospheric dispersion of 131 I emitted to the atmosphere during an industrial process was simulated with different models, namely the WRF-Chem Eulerian online coupled model and the HYSPLIT and the RAPTOR Lagrangian models. Although only limited data of 131 I detections has been available, the accuracy of modeled plume direction could be evaluated in complex late autumn weather situations. For the studied cases, the general reliability of models has been demonstrated. However, serious uncertainties arise related to low level inversions, above all in case of an emission event on 4 November 2011, when an important wind shear caused a significant difference between simulated and real transport directions. Results underline the importance of prudent interpretation of dispersion model results and the identification of weather conditions with a potential to cause large model errors.