| Title: | Development and evaluation of an improved offline aerosol mass spectrometry technique |
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| Authors: | ID Vasilakopoulou, Christina (Author)
ID Florou, Kalliopi (Author)
ID Kaltsonoudis, Christos (Author)
ID Stavroulas, Iasonas (Author)
ID Mihalopoulos, Nikolaos (Author)
ID Pandis, Spyros N. (Author) |
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| Files: |  https://amt.copernicus.org/articles/16/2837/2023/
https://amt.copernicus.org/articles/16/2837/2023/amt-16-2837-2023.pdf
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Abstract. The offline aerosol mass spectrometry technique is
a useful tool for the source apportionment of organic aerosol (OA) in areas
and periods during which an aerosol mass spectrometer (AMS) is not available. However, the technique is
based on the extraction of aerosol samples in water, while several
atmospheric OA components are partially or fully insoluble in water. In this work an improved offline technique was developed and evaluated in an effort to capture most of the partially soluble and insoluble organic aerosol material, reducing significantly the uncertainty of the corresponding source
apportionment. A major advantage of the proposed approach is that no
corrections are needed for the offline analysis to account for the limited
water solubility of some OA components. The improved offline AMS analysis
was tested in three campaigns: two during winter and one during summer.
Collocated online AMS measurements were performed for the evaluation of the offline method. Source apportionment analysis was performed separately for the online and the offline measurements using positive matrix
factorization (PMF). The PMF results showed that the fractional contribution of each factor to the total OA differed between the online and the offline PMF results by less than 15 %. The differences in the AMS spectra of the
factors of the two approaches could be significant, suggesting that the use
of factor profiles from the literature in the offline analysis may lead to
complications. Part of the good agreement between the online and the
offline PMF results is due to the ability of the improved offline AMS
technique to capture a bigger part of the OA, including insoluble organic
material. This was evident by the significant fraction of submicrometer
suspended insoluble particles present in the water extract and by the
reduced insoluble material on the filters after the extraction process. More than half of the elemental carbon (EC) was on average missing from the
filters after the water extraction. Significant EC concentrations were
measured in the produced aerosol that was used as input to the AMS during
the offline analysis. |
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| Keywords: | organic aerosol, receptor modeling, offline PMF, Greece |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.01.2023 |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 2837-2850 |
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| Numbering: | Vol. 16, issue 11 |
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| PID: | 20.500.12556/RUNG-9030  |
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| COBISS.SI-ID: | 195033859 |
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| UDC: | 53 |
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| ISSN on article: | 1867-8548 |
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| eISSN: | 1867-8548 |
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| DOI: | 10.5194/amt-16-2837-2023 |
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| NUK URN: | URN:SI:UNG:REP:19VC2MH4 |
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| Publication date in RUNG: | 10.05.2024 |
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| Views: | 131 |
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| Downloads: | 2 |
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