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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10445428" target="_blank" >RIV/00216208:11310/22:10445428 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QFduUGfw29" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QFduUGfw29</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/acp-22-5829-2022" target="_blank" >10.5194/acp-22-5829-2022</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

Seasonal variability of non-refractory PM1 (NR-PM1) was studied at a rural background site (National Atmospheric Observatory Kogetice - 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 +/- 2.92 / 4.55 +/- 4.40 µg m(-3)], followed by SO4(2-) in summer [1.68 +/- 0.81 / 1.36 +/- 1.38 µg m(-3)] and NOT 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: 334/413 nm, NO3(-) : 377/501 nm, SO4(2-) : 400/547 nm, and NH4(+) : 489/515 nm) indicating regional and long-range transport. However, since the winter aerosols were less oxidized than the summer aerosols [comparing fragments f(44) and f(43)], 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 SO4(2-) and NH4(+). 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 (ρ(m)) corresponded to higher inorganic contents in both seasons [summer approx. 1.30 g cm(-3) and winter: approx. 1.40 g cm(-3)]. During episodes of higher mass concentrations ρ(m) 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 (D(m)) 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

Seasonal variability of non-refractory PM1 (NR-PM1) was studied at a rural background site (National Atmospheric Observatory Kogetice - 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 +/- 2.92 / 4.55 +/- 4.40 µg m(-3)], followed by SO4(2-) in summer [1.68 +/- 0.81 / 1.36 +/- 1.38 µg m(-3)] and NOT 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: 334/413 nm, NO3(-) : 377/501 nm, SO4(2-) : 400/547 nm, and NH4(+) : 489/515 nm) indicating regional and long-range transport. However, since the winter aerosols were less oxidized than the summer aerosols [comparing fragments f(44) and f(43)], 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 SO4(2-) and NH4(+). 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 (ρ(m)) corresponded to higher inorganic contents in both seasons [summer approx. 1.30 g cm(-3) and winter: approx. 1.40 g cm(-3)]. During episodes of higher mass concentrations ρ(m) 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 (D(m)) 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Atmospheric Chemistry and Physics

ISSN

1680-7316

e-ISSN

1680-7324

Svazek periodika

22

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

30

Strana od-do

5829-5858

Kód UT WoS článku

000790345000001

EID výsledku v databázi Scopus

2-s2.0-85130136469