1. The determination of source-separated black carbon emission rates using radon as a tracer of atmospheric dynamicsAsta Gregorič, Luka Drinovec, Janja Vaupotič, Irena Ježek, Matic Ivančič, Janja Turšič, Griša Močnik, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: black carbon, emission rate, aethalometer, radon Objavljeno v RUNG: 17.11.2021; Ogledov: 1317; Prenosov: 41
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3. Variability of black carbon aerosol concentrations and sources at a Mediterranean coastal regionAndrea Milinković, Asta Gregorič, Vedrana Džaja Grgičin, Sonja Vidić, Abra Penezić, Ana Cvitešić Kušan, Saranda Bakija Alempijević, Anne Kasper Giebl, Sanja Frka, 2021, izvirni znanstveni članek Ključne besede: Aethalometer, Adriatic sea, Black carbon, Source apportionment, Levoglucosan, LOTOS-EURO Objavljeno v RUNG: 17.11.2021; Ogledov: 1232; Prenosov: 6
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4. The determination of highly time-resolved and source-separated black carbon emission rates using radon as a tracer of atmospheric dynamicsAsta Gregorič, Luka Drinovec, Irena Ježek, Janja Vaupotič, Matevž Lenarčič, Domen Grauf, Longlong Wang, Maruška Mole, Samo Stanič, Griša Močnik, 2020, izvirni znanstveni članek Ključne besede: black carbon, radon, air pollution, biomass burning, Aethalometer Objavljeno v RUNG: 10.05.2021; Ogledov: 1843; Prenosov: 0 Gradivo ima več datotek! Več... |
5. Determination of Aethalometer multiple-scattering enhancement parameters and impact on source apportionment during the winter 2017/18 EMEP/ACTRIS/COLOSSAL campaign in MilanVera Bernardoni, Luca Ferrero, Ezio Bolzacchini, Alice Corina Forello, Asta Gregorič, Dario Massabo, Griša Močnik, Paolo Prati, Martin Rigler, Luca Santagostini, 2021, izvirni znanstveni članek Opis: In the frame of the EMEP/ACTRIS/COLOSSAL campaign in Milan during winter 2018, equivalent black carbon measurements using the Aethalometer 31 (AE31), the Aethalometer 33 (AE33), and a Multi-Angle Absorption Photometer (MAAP) were carried out together with levoglucosan analyses on 12 h resolved PM2.5 samples collected in parallel.
From AE31 and AE33 data, the loading-corrected aerosol attenuation coefficients (bATN) were calculated at seven wavelengths (λ, where λ values are 370, 470, 520, 590, 660, 880, and 950 nm). The aerosol absorption coefficient at 637 nm (babs_MAAP) was determined by MAAP measurements. Furthermore, babs was also measured at four wavelengths (405, 532, 635, 780 nm) on the 12 h resolved PM2.5 samples by a polar photometer (PP_UniMI).
After comparing PP_UniMI and MAAP results, we exploited PP_UniMI data to evaluate the filter multiple-scattering enhancement parameter at different wavelengths for AE31 and AE33. We obtained instrument- and wavelength-dependent multiple-scattering enhancement parameters by linear regression of the Aethalometer bATN against the babs measured by PP_UniMI. We found significant dependence of the multiple-scattering enhancement parameter on filter material, hence on the instrument, with a difference of up to 30 % between the AE31 and the AE33 tapes. The wavelength dependence and day–night variations were small – the difference between the smallest and largest value was up to 6 %.
Data from the different instruments were used as input to the so-called “Aethalometer model” for optical source apportionment, and instrument dependence of the results was investigated. Inconsistencies among the source apportionment were found fixing the AE31 and AE33 multiple-scattering enhancement parameters to their usual values. In contrast, optimised multiple-scattering enhancement parameters led to a 5 % agreement among the approaches.
Also, the component apportionment “MWAA model” (Multi-Wavelength Absorption Analyzer model) was applied to the dataset. It was less sensitive to the instrument and the number of wavelengths, whereas significant differences in the determination of the absorption Ångström exponent for brown carbon were found (up to 22 %). Ključne besede: black carbon, filter photometer, Aethalometer, source apportionment Objavljeno v RUNG: 16.04.2021; Ogledov: 1804; Prenosov: 0 Gradivo ima več datotek! Več... |
6. The filter loading effect by ambient aerosols in filter absorption photometers depends on the mixing state of the sampled particlesLuka Drinovec, Asta Gregorič, Peter Zotter, Robert Wolf, Emily Anne Bruns, Andre S.H. Prevot, Jean-Eudes Petit, Olivier Favez, JEAN SCIARE, Ian J. Arnold, Rajan K. Chakrabarty, Hans Moosmüller, Agnes Fülöp-Miller, Griša Močnik, 2016, izvirni znanstveni članek Ključne besede: black carbon, mixing state, Aethalometer, filter-loading effect Objavljeno v RUNG: 02.11.2016; Ogledov: 5024; Prenosov: 278
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