| Autor: |
Soupiadou, Anna, Lolis, Christos J., Hatzianastassiou, Nikolaos |
| Předmět: |
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| Zdroj: |
Environmental Sciences Proceedings; 2023, Vol. 26, p1-6, 6p |
| Abstrakt: |
The dependence of the atmospheric pollution levels on the synoptic conditions and the associated prevailing weather regimes over Ioannina was examined for the 3-year period of 15 February 2019-14 February 2022. The study period is constrained by the availability of quality local air (particulate and gaseous) pollution measurements. The data used consist of (1) daily grid point values of the main meteorological parameters over the geographical domains of southeastern Europe and the greater Epirus region, obtained from ERA5 Reanalysis database and (2) hourly values of the main meteorological parameters and the concentration of basic pollutants recorded at the automatic environmental station of the Epirus Region located at the center of Ioannina. At first, 12 Weather Types (WTs) were defined on daily basis by applying a multivariate statistical methodology including Factor Analysis and k-means Cluster Analysis of the meteorological data. Next, for each WT, the average values, the standard deviations and the mean diurnal variations in the pollutant concentrations were calculated. According to the results, it appears that almost all pollutant concentrations were considerably higher during two anticyclonic WTs prevailing in the cold period of the year, while the diurnal variations in the concentrations were affected by the diurnal variations in traffic, combustion processes and solar radiation. The exact influence of the above factors depends on the characteristics of the prevailing WT. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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