Repository of University of Nova Gorica

Show document
A+ | A- | Help | SLO | ENG

Title:Determination of Aethalometer multiple-scattering enhancement parameters and impact on source apportionment during the winter 2017/18 EMEP/ACTRIS/COLOSSAL campaign in Milan
Authors:ID Bernardoni, Vera (Author)
ID Ferrero, Luca (Author)
ID Bolzacchini, Ezio (Author)
ID Forello, Alice Corina (Author)
ID Gregorič, Asta (Author)
ID Massabo, Dario (Author)
ID Močnik, Griša (Author)
ID Prati, Paolo (Author)
ID Rigler, Martin (Author)
ID Santagostini, Luca (Author), et al.
Files: This document has no files that are freely available to the public. This document may have a physical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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 %).
Keywords:black carbon, filter photometer, Aethalometer, source apportionment
Year of publishing:2021
Number of pages:str. 2919-2940
Numbering:Vol. 14, iss. 4
PID:20.500.12556/RUNG-6486 New window
COBISS.SI-ID:60095235 New window
UDC:504
ISSN on article:1867-1381
DOI:10.5194/amt-14-2919-2021 New window
NUK URN:URN:SI:UNG:REP:H4O9CWKW
Publication date in RUNG:16.04.2021
Views:2215
Downloads:0
Metadata:XML RDF-CHPDL DC-XML DC-RDF
:
Copy citation
  
Average score:(0 votes)
Your score:Voting is allowed only for logged in users.
Share:Bookmark and Share


Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Record is a part of a journal

Title:Atmospheric measurement techniques
Shortened title:Atmos. meas. tech.
Publisher:Copernicus Publications
ISSN:1867-1381
COBISS.SI-ID:517910809 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P1-0385
Name:Daljinsko zaznavanje atmosferskih lastnosti

Back