| Naslov: | Increase in secondary organic aerosol in an urban environment : Increase in secondary organic aerosol in an urban environment |
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| Avtorji: | ID Via, Marta (Avtor)
ID Cruz Minguillon, Maria (Avtor)
ID Reche, Cristina (Avtor)
ID Querol, Xavier (Avtor)
ID Alastuey, Andrés (Avtor) |
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| Datoteke: |  Via_2021_increase_in_secondary_organic_aerosol_in_an_urban_environment_Suppl.pdf (4,93 MB)
MD5: 8FF81340263F74BB8C4D416EC842ECE9
Via_2021_increase_in_secondary_organic_aerosol_in_an_urban_environment.pdf (2,89 MB)
MD5: 071B6E4A363A5DD7E008921FF355987D
 https://acp.copernicus.org/articles/21/8323/2021/
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| Jezik: | Angleški jezik |
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| Vrsta gradiva: | Neznano |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: | UNG - Univerza v Novi Gorici
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| Opis: | The evolution of fine aerosol (PM1) species as well as the contribution of potential sources to the total organic aerosol (OA) at an urban background site in Barcelona, in the western Mediterranean basin (WMB) was investigated. For this purpose, a quadrupole aerosol chemical speciation monitor (Q-ACSM) was deployed to acquire real-time measurements for two 1-year periods: May 2014–May 2015 (period A) and September 2017–October 2018 (period B). Total PM1 concentrations showed a slight decrease (from 10.1 to 9.6 μgm�3 from A to B), although the relative contribution of inorganic and organic compounds varied significantly. Regarding inorganic compounds, SO42- , black carbon(BC) and NH4+ showed a significant decrease from period
A to B (21 %, 18% and 9 %, respectively), whilst NO3- concentrations were higher in B (8 %). Source apportionment
revealed OA contained 46% and 70% secondary OA (SOA) in periods A and B, respectively. Two secondary oxygenated OA sources (OOA) were differentiated by their oxidation status (i.e. ageing): less oxidized (LO-OOA) and more oxidized (MO-OOA). Disregarding winter periods, when LO-OOA production was not favoured, LO-OOA transformation into MO-OOA was found to be more effective in
period B. The lowest LO-OOA-to-MO-OOA ratio, excluding winter, was in September–October 2018 (0.65), implying an accumulation of aged OA after the high temperature and solar radiation conditions in the summer season. In addition to temperature, SOA (sum of OOA factors) was enhanced by exposure to NOx-polluted ambient and other pollutants, especially to O3 and during afternoon hours. The anthropogenic primary OA sources identified, cooking-related
OA (COA), hydrocarbon-like OA (HOA), and biomass burning OA (BBOA), decreased from period A to B in both absolute concentrations and relative contribution (as a whole, 44% and 30 %, respectively). However, their concentrations and proportion to OA grew rapidly during highly polluted episodes. The influence of certain atmospheric episodes on OA sources was also assessed. Both SOA factors were boosted with long- and medium-range circulations, especially those coming from inland Europe and the Mediterranean (triggering mainly MO-OOA) and summer breeze-driven regional circulation (mainly LO-OOA). In contrast, POA was
enhanced either during air-renewal episodes or stagnation anticyclonic events. |
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| Ključne besede: | aerosol, organic aerosol, source apportionment, PM1, particulate matter |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Datum objave: | 01.01.2021 |
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| Leto izida: | 2021 |
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| Št. strani: | str. 8323-8339 |
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| Številčenje: | Vol. 21, issue 10 |
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| PID: | 20.500.12556/RUNG-9021  |
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| COBISS.SI-ID: | 194999811 |
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| UDK: | 53 |
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| ISSN pri članku: | 1680-7316 |
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| DOI: | 10.5194/acp-21-8323-2021 |
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| NUK URN: | URN:SI:UNG:REP:MWROZ518 |
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| Datum objave v RUNG: | 10.05.2024 |
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| Število ogledov: | 1084 |
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| Število prenosov: | 6 |
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| Metapodatki: |    |
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