Abstrakt
Measurements were conducted from 26th Jan to 21st Feb 2012 in Ostrava city in the north-east part of the Czech Republic. PM0.09-0.26 was sampled by the 8 stage Davis Rotating-drum Uniform-size-cut Monitoring (8DRUM) with 2-h time resolution (last stage of 8DRUM).
The 120 minute integrates of aerosol mass within the desired size range was calculated from five minute data by Scanning mobility Particle Sizer, (SMPSL-3936, L-25, TSI) Also PM2.5 by 7 laser photometers DustTrak, DT (8520, TSI) were measured to evaluate PM2.5 middle-scale variability. Complete meteorology wind speed (WS) wind direction (WD), temperature (T), relative humidity (RH), global radiation (GR), precipitation (P) were also concurrently recorded.
A bilinear receptor model, EPA PMF 4.2.0.0, was used to resolve the possible sources for 120 minutes integrations of mass concentrations with size interval 91.4 – 259.5 nm and elemental composition for 28 elements analyzed by S-XRF at the Advanced Light Source, Lawrence Berkeley National Laboratory, CA. According to the different meteorological condition and PM0.09-0.26 concentration is it possible to separate the measuring campaign to two periods.
The smog period characterised by low T (median=-14.8 °C), WS (median=0.7 m.s-1), WD prevailing from NE and high PM0.09-0.26 (median=23.4 g.m-3) lasted from 26th Jan to 14th Feb. The after smog period (15th – 21st Feb) was characterised by grow of T (median=-1.7 °C), WS (median=1.1 m.s-1), WD prevailing from NW to SW and precipitation, which resulted in PM0.09-0.26 decrease (median=7.4 g.m-3).
The PM2.5 inter-DT differences in the course of measurement were not statistically significant. As result the monitoring station position was eligible and air monitoring data representative for the urban environment.
Both PMF and PCA models resolved three dominant aerosol sources at the locality: Combustion, Steel production and Incinerator.