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Aristotle University of Thessaloniki (2021)

Study of dust episodes using innovative visualization tools

Γρηγοράκος Γιώργος

Titre : Study of dust episodes using innovative visualization tools

Μελέτη επεισοδίων σκόνης με την χρήση καινοτόμων εργαλείων οπτικοποίησης

Auteur : Γρηγοράκος Γιώργος

Etablissement de soutenance : Aristotle University of Thessaloniki

Grade : Graduate Theses 2021

Résumé
The aim of this dissertation is to develop a visualization tool for the study of a dust episode in the Mediterranean. The results of the WRF-NEMO-CAMx numerical model system were used for this purpose. The study period is 14-17 May 2020 and the data mainly covers the Mediterranean, North Africa, Europe, and the Middle East. To visualize the results, a python script was created based on the pyNGL library, which is used to generate high quality 2D representations of scientific data. This script was developed in order to be able to produce complete graphs, without the end user having special technical knowledge related to pyNGL. The code architecture starts with reading the results (using the pyNIO library) of the model system, which are given in NetCDF files. The data is then mapped to tables and variables, various parameters are defined. Operations are then performed between the tables to calculate the concentrations of coarse or fine dust particles. Important is the ability of the script to allow the separation and selection of specific layers. Thus, the transfer of dust in the surface layer, inside and outside the atmospheric boundary layer and, in total, in all layers is analyzed. Three more complementary functions have been developed, which, in essence combine the images generated by the script into a short animation. From the above data processing, images were produced that represent both the total movement of the dust as well as the movement inside and outside the atmospheric boundary layer. Furthermore, the concentrations of fine and coarse particles versus the total dust concentrations were calculated and plotted. The average concentrations in the surface layer were plotted, for each day, in order to compare the observed values with those defined by the legislation. From the above we concluded that the dust incident mainly affected Malta, Italy, the Balkans and Turkey. Specifically, the episode started in Tunisia, Western Libya and Eastern Algeria. The bulk of the dust moved over Malta, southern and central Italy as well as to the Balkans and Turkey. Overall, the dust followed a clockwise rotation centered initially around Crete, which shifted north during the last two days of the episode. The average daily concentrations far exceeded the limits set by the legislation.

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Page publiée le 23 novembre 2022