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1.
A GPS and Galileo carrier tracking architecture robust to ionospheric scintillation
Marko Vučković, Rodrigo Romero, Melania Susi, Fabio Dovis, Marcus Andreotti, Marcio Aquino, 2014, published scientific conference contribution

Found in: ključnih besedah
Summary of found: ...ionosferske scintilacije, prilagodljiv Kalmanov filter, GPS signali, Galileo signali, ...
Keywords: ionosferske scintilacije, prilagodljiv Kalmanov filter, GPS signali, Galileo signali
Published: 22.01.2015; Views: 3257; Downloads: 19
URL Fulltext (0,00 KB)

2.
Stability and toxicity of selected chlorinated benzophenone-type UV filters in waters
Polonca Trebše, Darko Dolenc, Romina Žabar, Tatjana Tišler, Gorica Grbović, Jun Yao, Rensheng Zhuang, 2013, original scientific article

Abstract: Stability and toxicity of selected chlorinated benzophenone-type UV filters in waters
Found in: ključnih besedah
Summary of found: ...UV filter, photostability, chlorination, toxicity, Vibrio fischeri, ...
Keywords: UV filter, photostability, chlorination, toxicity, Vibrio fischeri
Published: 05.01.2016; Views: 3184; Downloads: 1

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4.
Determination of Aethalometer multiple-scattering enhancement parameters and impact on source apportionment during the winter 2017/18 EMEP/ACTRIS/COLOSSAL campaign in Milan
Asta Gregorič, Dario Massabo, Griša Močnik, Paolo Prati, Martin Rigler, Luca Santagostini, Ezio Bolzacchini, Alice Corina Forello, Vera Bernardoni, Luca Ferrero, 2021, original scientific article

Abstract: 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 %).
Found in: ključnih besedah
Summary of found: ...we exploited PP_UniMI data to evaluate the filter multiple-scattering enhancement parameter at different wavelengths for...
Keywords: black carbon, filter photometer, Aethalometer, source apportionment
Published: 16.04.2021; Views: 302; Downloads: 0
.pdf Fulltext (1,95 MB)

5.
Intercomparison and characterization of 23 Aethalometers under laboratory and ambient air conditions:
Björn Briel, Vadimas Dudoitis, Javier Fernández-García, Paul Buckley, Sascha Pfeifer, Maria Cruz Minguillon, Thomas Müller, Luka Drinovec, Andrea Cuesta-Mosquera, Griša Močnik, 2021, original scientific article

Abstract: Aerosolized black carbon is monitored worldwide to quantify its impact on air quality and climate. Given its importance, measurements of black carbon mass concentrations must be conducted with instruments operating in quality-checked and ensured conditions to generate data which are reliable and comparable temporally and geographically. In this study, we report the results from the largest characterization and intercomparison of filter-based absorption photometers, the Aethalometer model AE33, belonging to several European monitoring networks. Under controlled laboratory conditions, a total of 23 instruments measured mass concentrations of black carbon from three well-characterized aerosol sources: synthetic soot, nigrosin particles, and ambient air from the urban background of Leipzig, Germany. The objective was to investigate the individual performance of the instruments and their comparability; we analyzed the response of the instruments to the different aerosol sources and the impact caused by the use of obsolete filter materials and the application of maintenance activities. Differences in the instrument-to-instrument variabilities from equivalent black carbon (eBC) concentrations reported at 880 nm were determined before maintenance activities (for soot measurements, average deviation from total least square regression was −2.0 % and the range −16 % to 7 %; for nigrosin measurements, average deviation was 0.4 % and the range −15 % to 17 %), and after they were carried out (for soot measurements, average deviation was −1.0 % and the range −14 % to 8 %; for nigrosin measurements, the average deviation was 0.5 % and the range −12 % to 15 %). The deviations are in most of the cases explained by the type of filter material employed by the instruments, the total particle load on the filter, and the flow calibration. The results of this intercomparison activity show that relatively small unit-to-unit variability of AE33-based particle light absorbing measurements is possible with well-maintained instruments. It is crucial to follow the guidelines for maintenance activities and the use of the proper filter tape in the AE33 to ensure high quality and comparable black carbon (BC) measurements among international observational networks.
Found in: ključnih besedah
Summary of found: ...from the largest characterization and intercomparison of filter-based absorption photometers, the Aethalometer model AE33, belonging...
Keywords: black carbon, aerosol, absorption, filter absorption photometer, aethaloemter
Published: 03.05.2021; Views: 215; Downloads: 0
.pdf Fulltext (5,57 MB)

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