51. The impact of temperature inversions on black carbon and particle mass concentrations in a mountainous areaKristina Glojek, Griša Močnik, Honey Dawn C. Alas, Andrea Cuesta-Mosquera, Luka Drinovec, Asta Gregorič, Matej Ogrin, Kay Weinhold, Irena Ježek, Martin Rigler, Maja Remškar, Miha Markelj, 2022, izvirni znanstveni članek Opis: Residential wood combustion is a widespread practice in Europe with a serious impact on air quality, especially in mountainous areas. While there is a significant number of studies conducted in deep urbanized valleys and basins, little is known about the air pollution processes in rural shallow hollows, where around 30 % of the people in mountainous areas across Europe live. We aim to determine the influence of ground temperature inversions on wood combustion aerosol pollution in hilly, rural areas. The study uses Retje karst hollow (Loški Potok, Slovenia) as a representative site for mountainous and hilly rural areas in central and south-eastern Europe with residential wood combustion. Sampling with a mobile monitoring platform along the hollow was performed in December 2017 and January 2018. The backpack mobile monitoring platform was used for the determination of equivalent black carbon (eBC) and particulate matter (PM) mass concentrations along the hollow. To ensure high quality of mobile measurement data, intercomparisons of mobile instruments with reference instruments were performed at two air quality stations during every run. Our study showed that aerosol pollution events in the relief depression were associated with high local emission intensities originating almost entirely from residential wood burning and shallow temperature inversions (58 m on average). The eBC and PM mass concentrations showed stronger associations with the potential temperature gradient (R2=0.8) than with any other meteorological parameters taken into account (ambient temperature, relative humidity, wind speed, wind direction, and precipitation). The strong association between the potential temperature gradient and pollutant concentrations suggests that even a small number of emission sources (total 243 households in the studied hollow) in similar hilly and mountainous rural areas with frequent temperature inversions can significantly increase the levels of eBC and PM and deteriorate local air quality. During temperature inversions the measured mean eBC and PM2.5 mass concentrations in the whole hollow were as high as 4.5±2.6 and 48.0 ± 27.7 µg m−3, respectively, which is comparable to larger European urban centres.
Ključne besede: air pollution, black carbon, sources, temperature inversion, mountainous area
Objavljeno v RUNG: 03.05.2022; Ogledov: 1382; Prenosov: 0
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52. 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, izvirni znanstveni članek Opis: We report on an inter-comparison of black-carbon- and aerosol-absorption-measuring instruments with laboratory-generated soot particles coated with controlled amounts of secondary organic matter (SOM). The aerosol generation setup consisted of a miniCAST 5201 Type BC burner for the generation of soot particles and a new automated oxidation flow reactor based on the micro smog chamber (MSC) for the generation of SOM from the ozonolysis of α-pinene. A series of test aerosols was generated with elemental to total carbon (EC TC) mass fraction ranging from about 90 % down to 10 % and single-scattering albedo (SSA at 637 nm) from almost 0 to about 0.7. A dual-spot Aethalometer AE33, a photoacoustic extinctiometer (PAX, 870 nm), a multi-angle absorption photometer (MAAP), a prototype photoacoustic instrument, and two prototype photo-thermal interferometers (PTAAM-2λ and MSPTI) were exposed to the test aerosols in parallel. Significant deviations in the response of the instruments were observed depending on the amount of secondary organic coating. We believe that the setup and methodology described in this study can easily be standardised and provide a straightforward and reproducible procedure for the inter-comparison and characterisation of both filter-based and in situ black-carbon-measuring (BC-measuring) instruments based on realistic test aerosols.
Ključne besede: black carbon, aerosol absorption, secondary organic aerosol, coating
Objavljeno v RUNG: 01.02.2022; Ogledov: 1689; Prenosov: 48
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53. Carbon and Nitrogen K-Edge NEXAFS Spectra of Indole, 2,3-Dihydro-7-azaindole, and 3-FormylindoleAurora Ponzi, Elisa Bernes, Daniele Toffoli, Giovanna Fronzoni, Carlo Callegari, Alessandra Ciavardini, Michele Di Fraia, Robert Richter, Kevin Charles Prince, Hanan Sa'adeh, Michele Devetta, Davide Faccialà, Caterina Vozzi, Lorenzo Avaldi, Paola Bolognesi, Mattea Castrovilli, Daniele Catone, Marcello Coreno, Oksana Plekan, 2021, izvirni znanstveni članek Ključne besede: Carbon and nitrogen, General description, Hybrid functional, Near-edge X-ray absorption fine structure spectrum, Relevant features, Rydberg character, Theoretical spectra, Time dependent density functional theory
Objavljeno v RUNG: 19.01.2022; Ogledov: 1808; Prenosov: 0
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54. 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: 1585; Prenosov: 0
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55. 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: 1843; Prenosov: 42
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56. Camp Fire 2018: Highly time-resolved study of eOC, eBC and BrC aerosols by the TC-BC (total carbon–black carbon) methodMatic Ivančič, Gašper Lavrič, Asta Gregorič, Balint Alfoldy, Irena Ježek, Jack Connor, Charity Garland, Jonathan P. Bower, Martin Rigler, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: total carbon, black carbon, brown carbon
Objavljeno v RUNG: 17.11.2021; Ogledov: 1841; Prenosov: 51
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58. 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: 1774; Prenosov: 8
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59. Whole-life carbon emissions benchmarks for buildings in SloveniaMarjana Šijanec-Zavrl, Henrik Gjerkeš, 2021, kratki znanstveni prispevek Opis: According to the European Green Deal decarbonisation of EU building stock is needed on the way to turning EU into the first climate neutral continent by 2050. Directive (2010/31/EU) EPBD led to significant reduction of operational energy in new buildings and renovation. By energy efficiency first principle and by increasing renewable energy sources it contributed to reduction of primary energy and operational CO2 emissions. But the orientation towards lifecycle thinking and circularity in the building sector revealed the need to tackle the whole-life carbon emissions, where the operational and embodied carbon contribute significantly. In the absence of benchmarks for embodied carbon emissions in this contribution the operational and embodied carbon indicators from recent studies are compared with the available corresponding data in Slovenian energy performance certificates.
Ključne besede: carbon emissions, life cycle assessment, buildings
Objavljeno v RUNG: 29.10.2021; Ogledov: 1767; Prenosov: 0
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60. Characterization of non-refractory (NR) PM[sub]1 and source apportionment of organic aerosol in Kraków, PolandAnna Tobler, Alicja Skiba, Francesco Canonaco, Griša Močnik, Pragati Rai, Gang Chen, Jakub Bartyzel, Miroslaw Zimnoch, Katarzyna Styszko, Jaroslaw Nęcki, 2021, izvirni znanstveni članek Opis: Kraków is routinely affected by very high air pollution levels, especially during the winter months. Although a lot of effort has been made to characterize ambient aerosol, there is a lack of online and long-term measurements of non-refractory aerosol. Our measurements at the AGH University of Science and Technology provide the online long-term chemical composition of ambient submicron particulate matter (PM1) between January 2018 and April 2019. Here we report the chemical characterization of non-refractory submicron aerosol and source apportionment of the organic fraction by positive matrix factorization (PMF). In contrast to other long-term source apportionment studies, we let a small PMF window roll over the dataset instead of performing PMF over the full dataset or on separate seasons. In this way, the seasonal variation in the source profiles can be captured. The uncertainties in the PMF solutions are addressed by the bootstrap resampling strategy and the random a-value approach for constrained factors.
We observe clear seasonal patterns in the concentration and composition of PM1, with high concentrations during the winter months and lower concentrations during the summer months. Organics are the dominant species throughout the campaign. Five organic aerosol (OA) factors are resolved, of which three are of a primary nature (hydrocarbon-like OA (HOA), biomass burning OA (BBOA) and coal combustion OA (CCOA)) and two are of a secondary nature (more oxidized oxygenated OA (MO-OOA) and less oxidized oxygenated OA (LO-OOA)). While HOA contributes on average 8.6 % ± 2.3 % throughout the campaign, the solid-fuel-combustion-related BBOA and CCOA show a clear seasonal trend with average contributions of 10.4 % ± 2.7 % and 14.1 %, ±2.1 %, respectively. Not only BBOA but also CCOA is associated with residential heating because of the pronounced yearly cycle where the highest contributions are observed during wintertime. Throughout the campaign, the OOA can be separated into MO-OOA and LO-OOA with average contributions of 38.4 % ± 8.4 % and 28.5 % ± 11.2 %, respectively.
Ključne besede: air pollution, PM1, organic aerosol, black carbon, source apportionment, PMF
Objavljeno v RUNG: 08.10.2021; Ogledov: 1884; Prenosov: 0
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