Concentration changes of PM10 under liquid precipitation conditions

• Autorzy: Olszowski T.

Identyfikatory

DOI

10.1515/eces-2015-0019

Warianty tytułu

PL

Zmiany stężenia PM10 w warunkach występowania opadów ciekłych

• Języki publikacji: EN

Abstrakty

EN

This study reports the results of field research into variability of the scavenging coefficient (Λ) of suspended dust comprising particles with aerodynamic diameters less than 10 mm. Registration of PM10 over 7 years in conditions of the occurrence of rainfall (convective light showers, large-scale precipitation and storms) was undertaken in an undeveloped rural area. The analysis involved 806 observations taken at constant time intervals of 0.5 hour. The measurements of the concentration of PM10 were performed by means of a reference method accompanied by concurrent registration of basic meteorological parameters. It was found that, for PM10, the scavenging efficiency is considerably influenced by rainfall intensity R and the type of precipitation. In the case of convective precipitation, data on Λ are only partially related to “classical approach” of rain scavenging. Within the range of comparable values of rainfall intensity, the type of wet deposition (except for storms) does not influence the effectiveness of scavenging PM10 from the ground-level zone. The large number of observations conducted in real-time conditions yielded a proposal of simple regression model, which can be deemed suitable for the description of variability Λ (DPM10), but only to a limited extent for large-scale precipitation. The collected results can be applied in air pollution dispersion models and deposition and were found to be generally representative for areas with similar climatic characteristics.

PL

W pracy przedstawiono wyniki polowych badań nad zmiennością współczynnika wymywania Λ pyłu zawieszonego o aerodynamicznej średnicy cząstek poniżej 10 μm. Siedmioletnie rejestracje zmian stężenia PM10 w warunkach występowania trzech typów opadów ciekłych (konwekcyjnych, wielkoskalowych i burz) przeprowadzono na obszarze niezurbanizowanym. Analizie poddano 806 przypadków obserwacji o stałej rozdzielczości czasowej 0,5 h. Pomiary stężenia PM10 prowadzono z użyciem metody referencyjnej przy jednoczesnej rejestracji podstawowych parametrów meteorologicznych. Wykazano, że dla PM10 efektywność wymywania jest silnie zależna od intensywności opadu R oraz od typu opadu. W przypadku opadów konwekcyjnych dane dotyczące wartości Λ są tylko częściowo związane z „klasycznym podejściem” wymywania cząstek przez deszcz. W zakresie porównywalnych wartości intensywności opadu typ mokrej depozycji (z wyjątkiem burz) nie wpływa na efektywność oczyszczania troposfery przyziemnej z PM10. Znaczna ilość prowadzonych w warunkach rzeczywistych obserwacji opadów wielkoskalowych pozwoliła na zaproponowanie prostego modelu regresji, który z wysokim prawdopodobieństwem, ale w ograniczonym zakresie, może zostać uznany za odpowiedni do opisu zmienności Λ (DPM10). Uzyskane wyniki badań mogą znaleźć zastosowanie w modelach dyspersji i depozycji zanieczyszczeń i są reprezentatywne dla obszarów o podobnej charakterystyce klimatu.

Słowa kluczowe

EN

aerosol; wet deposition; washout; non-urban area

PL

aerozol; mokra depozycja; wymywanie podchmurowe; obszar niezurbanizowany

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. S
• Rocznik: 2015
• Tom: Vol. 22, nr 3
• Strony: 363--378
• Opis fizyczny: Bibliogr. 47 poz., tab., wykr.

Twórcy

autor

Olszowski T.

• Department of Thermal Engineering and Industrial Facilities, Faculty of Mechanical Engineering, Opole University of Technology, ul. S. Mikołajczyka 5, 45-271 Opole, Poland, phone [phone], fax [phone]

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