1. Applicability of benchtop multi-wavelength polar photometers to off-line measurements of the Multi-Angle Absorption Photometer (MAAP) samplesSara Valentini, Vera Bernardoni, Ezio Bolzacchini, Davide Ciniglia, Luca Ferrero, Alice Corina Forello, Dario Massabò, Marco Pandolfi, Paolo Prati, Jesús Yus-Díez, 2021, izvirni znanstveni članek Ključne besede: aerosol absorption coefficient, equivalent black carbon, MAAP, polar photometer, multi-wavelength Objavljeno v RUNG: 13.05.2024; Ogledov: 931; Prenosov: 2 Povezava na datoteko Gradivo ima več datotek! Več... |
2. Comparing black-carbon- and aerosol-absorption-measuring instruments : a new system using lab-generated soot coated with controlled amounts of secondary organic matterDaniel M. Kalbermatter, Griša Močnik, Luka Drinovec, Bradley Visser, Jannis Röhrbein, Matthias Oscity, Ernest Weingartner, Antti-Pekka Hyvärinen, Konstantina Vasilatou, 2022, zaključena znanstvena zbirka raziskovalnih podatkov Opis: A preprint of the publication can be found here: AMTD - Response of black carbon and aerosol absorption measuring instruments to laboratory-generated soot coated with controlled amounts of secondary organic matter (copernicus.org) (doi.org/10.5194/amt-2021-214). The files correspond to the raw data sets used for Figures 3 and 4 of the aforementioned publication. The date and start/stop time of the measurements are listed in the file "overview_measurements". Ključne besede: aerosol absorption coefficient, black carbon, absorption enhancement Objavljeno v RUNG: 19.03.2024; Ogledov: 1543; Prenosov: 5 Celotno besedilo (598,88 KB) Gradivo ima več datotek! Več... |
3. Phenomenology of organic aerosols light absorption in Europe based on in situ surface observationsJordi Rovira, Jesús Yus-Díez, Griša Močnik, 2024, objavljeni povzetek znanstvenega prispevka na konferenci Opis: Both chamber and field experiments have shown that a fraction of organic aerosols (OA), called brown carbon (BrC), can efficiently absorb UV-VIS radiation with important effects on radiation balance. However, the optical properties of BrC, and its climate effects, remain poorly understood because a variety of chemical compositions are involved and their fractions vary with source and formation process. We present a phenomenology of OA light absorption in Europe using Aethalometer (AE) data. AE data were used to calculate the black carbon (BC) and BrC contribution to the total measured absorption in the UV-VIS spectral range (babs,BC(l), babsBrC(l)). Fig. 1 shows the BrC absorption at 370 nm and shows that the BrC absorption was on average higher in urban than in rural sites.
Figure 1. Map of BrC absorption in rural and urban sites.
At 18 out of 41 sites, simultaneous ACSM (Aerosol Chemical Speciation Monitor) data were available allowing reporting the mass absorption cross-section (MAC), the imaginary refractive index (k), the k Angström Exponent (w) of OA particles and OA sources. We compared the experimental data the with Saleh’s classification, that groups BrC in four optical classes, namely very weakly (VW-BrC), weakly (W-BrC), moderately (M-BrC) and strongly (S-BrC) absorbing BrC. Preliminary results show that both MAC and k of POA sources were higher compared to SOA sources and that BBOA (biomass burning OA) followed by CCOA (coal combustion OA) and HOA (hydrocarbon-like OA) dominated the absorption by BrC. Data reported indicate a relationship between w and k with higher w associated to less absorbing OA particles.
With this work we provide a robust experimental framework that can be used to better constrain the climate effect of OA particles represented in climate models. In our results we found that most of the measured ambient OA particles present from W to M absorption properties. Variations in OA k and w depend on the relative contribution of POA compared to SOA as also reflected by the higher k observed in winter compared to summer. Our results also demonstrate a strong variation of OA optical properties in Europe thus further confirming the complexity of OA absorption properties.
This work was supported by the FOCI Project (G.A. 101056783) and ARRS P1-0385. Action Cost COLOSSAL. We thank the COLOSSAL Team for providing OA sources and AE33 data.
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Saleh et al (2020). Curr. Pollution Rep. 6, 90–104. Ključne besede: black carbon, brown carbon, aerosol absorption coefficient Objavljeno v RUNG: 18.03.2024; Ogledov: 1737; Prenosov: 7 Celotno besedilo (439,68 KB) Gradivo ima več datotek! Več... |
4. A dual-wavelength photothermal aerosol absorption monitor : design, calibration, performance and measurements of coated sootGriša Močnik, 2023, predavanje na tuji univerzi Ključne besede: aerosol absorption, photo-thermal interferometer, absorption coefficient, black carbon, soot, aerosol coating, absorption enhancement Objavljeno v RUNG: 05.10.2023; Ogledov: 1943; Prenosov: 1 Gradivo ima več datotek! Več... |
5. Experimental dataset - A dual-wavelength photothermal aerosol absorption monitor: design, calibration and performanceLuka Drinovec, Uroš Jagodič, Luka Pirker, Miha Škarabot, Mario Kurtjak, Kristijan Vidović, Luca Ferrero, Bradley Visser, Jannis Röhrbein, Ernest Weingartner, Daniel Kalbermatter, Konstantina Vasilatou, Tobias Bühlmann, Celine Pascale, Thomas Müller, Alfred Wiedensohler, Griša Močnik, zaključena znanstvena zbirka raziskovalnih podatkov Ključne besede: photothermal interferometer, aerosol light absorption coefficient Objavljeno v RUNG: 14.01.2022; Ogledov: 2734; Prenosov: 35 Celotno besedilo (531,36 MB) Gradivo ima več datotek! Več... |
6. Contribution of coal combustion to black carbon : coupling tracers with the aethalometer modelC. Blanco-Alegre, Paulo Fialho, A. I. Calvo, A. Castro, E. Coz, F. Oduber, A. S. H. Prevot, Griša Močnik, C. Alves, F. Giardi, G. Pazzi, R. Fraile, 2022, izvirni znanstveni članek Ključne besede: absorption coefficient, coal-mining, equivalent black carbon, meteorological variables, seasonal pattern Objavljeno v RUNG: 03.01.2022; Ogledov: 2514; Prenosov: 0 Gradivo ima več datotek! Več... |