Chemically speciated mass size distribution, particle density, shape and origin of 2 non-refractory PM1 measured at a rural background site in Central Europe.

0556453 - ÚCHP 2023 RIV DE eng J - Journal Article
Pokorná, Petra - Zíková, Naděžda - Vodička, Petr - Lhotka, Radek - Mbengue, Saliou - Holubová Šmejkalová, A. - Riffault, V. - Ondráček, Jakub - Schwarz, Jaroslav - Ždímal, Vladimír
Chemically speciated mass size distribution, particle density, shape and origin of 2 non-refractory PM1 measured at a rural background site in Central Europe.
Atmospheric Chemistry and Physics. Roč. 22, č. 9 (2022), s. 5829-5858. ISSN 1680-7316. E-ISSN 1680-7324
R&D Projects: GA MŠMT(CZ) LM2018122; GA MŠMT(CZ) EF16_013/0001315; GA ČR(CZ) GJ19-06110Y
EU Projects: European Commission(XE) CA16109 - Cost Action COLOSSAL
Research Infrastructure: CzeCOS III - 90123
Institutional support: RVO:67985858 ; RVO:86652079
Keywords : PM1 * seasonal variability * concentration
OECD category: Meteorology and atmospheric sciences; Meteorology and atmospheric sciences (UEK-B)
Impact factor: 6.3, year: 2022
Method of publishing: Open access
https://acp.copernicus.org/articles/22/5829/2022/acp-22-5829-2022.pdf

Seasonal variability of non-refractory PM1 (NR-PM1) was studied at a rural background site (National Atmospheric Observatory Košetice – NAOK) in the Czech Republic to investigate the effect of regional and long-range atmospheric transport in central Europe. NR-PM1 measurements were performed by compact time-of-flight aerosol mass spectrometry (C-ToF-AMS), and the chemically speciated mass size distributions, density, shape, and origin were discussed. Average PM1 concentrations, calculated as the sum of the NR-PM1 and the equivalent black carbon (eBC) concentrations measured by an aethalometer (AE), were 8.58 ± 3.70 µg m−3 in summer and 10.08 ± 8.04 µg m−3 in winter. Organics were dominant during both campaigns (summer/winter: 4.97 ± 2.924.55 ± 4.40 µg m−3), followed by SOin summer (1.68 ± 0.81/1.36 ± 1.38 µg m−3) and NO in winter (0.67 ± 0.38/2.03 ± 1.71 µg m−3). The accumulation mode dominated the average mass size distribution during both seasons, with larger particles of all species measured in winter (mode diameters: Org: 334413 nm, NO: 377/501 nm, SO: 400547 nm, and NH: 489515 nm) indicating regional and long-range transport. However, since the winter aerosols were less oxidized than the summer aerosols (comparing fragments f44 and f43), the importance of local sources in the cold part of the year was still enough to be considered. Although aged continental air masses from the south-east (SE) were rare in summer (7 %), they were related to the highest concentrations of PM1, eBC, and all NR-PM1 species, especially SO and NH. In winter, slow continental air masses from the south-west (SW) (44 %) were linked to inversion conditions over central Europe and were associated with the highest concentrations among all NR-PM1 species as well as PM1 and eBC. Average PM1 material density (ρm) corresponded to higher inorganic contents in both seasons (summer: ∼ 1.30 g cm−3 and winter: ∼ 1.40 g cm−3). During episodes of higher mass concentrations ρm ranged from 1.30–1.40 g cm−3 in summer and from 1.30–1.50 g cm−3 in winter. The dynamic shape factors (χ) decreased slightly with particle mobility diameter (Dm) in both seasons. This study provides insights into the seasonal effects and air mass variability on aerosol particles, focusing on episodes of high mass and number concentrations measured at a central European rural background site.
Permanent Link: http://hdl.handle.net/11104/0331178