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Title:Determining the Aethalometer multiple scattering enhancement factor C from the filter loading parameter
Authors:ID Ferrero, Luca (Author)
ID Losi, Niccolò (Author)
ID Rigler, Martin (Author)
ID Gregorič, Asta (Author)
ID Colombi, C. (Author)
ID D'Angelo, L. (Author)
ID Cuccia, E. (Author)
ID Cefalì, A. M. (Author)
ID Gini, I. (Author)
ID Doldi, A. (Author)
Files:.pdf 1-s2.0-S0048969724003565-main.pdf (3,18 MB)
MD5: 7E10AC5FD9D56F333A786FEF6D8FB1F6
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Light-absorbing aerosols heat the atmosphere; an accurate quantification of their absorption coefficient is mandatory. However, standard reference instruments (CAPS, MAAP, PAX, PTAAM) are not always available at each measuring site around the world. By integrating all previous published studies concerning the Aethalometers, the AE33 filter loading parameter, provided by the dual-spot algorithm, were used to determine the multiple scattering enhancement factor from the Aethalometer itself (hereinafter CAE) on an yearly and a monthly basis. The method was developed in Milan, where Aethalometer measurements were compared with MAAP data; the comparison showed a good agreement in terms of equivalent black carbon (R2 = 0.93; slope = 1.02 and a negligible intercept = 0.12 μg m−3) leading to a yearly experimental multiple scattering enhancement factor of 2.51 ± 0.04 (hereinafter CMAAP). On a yearly time base the CAE values obtained using the new approach was 2.52 ± 0.01, corresponding to the experimental one (CMAAP). Considering the seasonal behavior, higher experimental CMAAP and computed CAE values were found in summer (2.83 ± 0.12) whereas, the lower ones in winter/early-spring (2.37 ± 0.03), in agreement with the single scattering albedo behavior in the Po Valley. Overall, the agreement between the experimental CMAAP and CAE showed a root mean squared error (RMSE) of just 0.038 on the CMAAP prediction, characterized by a slope close to 1 (1.001 ± 0.178), a negligible intercept (−0.002 ± 0.455) and a high degree of correlation (R2 = 0.955). From an environmental point of view, the application of a dynamic (space/time) determination of CAE increases the accuracy of the aerosol heating rate (compared to applying a fixed C value) up to 16 % solely in Milan, and to 114 % when applied in the Arctic at 80°N.
Keywords:aethalometer, C factor, loading parameter, MAAP, heating rate
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2024
Year of publishing:2024
Number of pages:str. 1-20
Numbering:Vol. 917, [article no.] ǂ170221
PID:20.500.12556/RUNG-8841-946305d0-0ee9-1e26-919d-65b200553522 New window
COBISS.SI-ID:183608579 New window
UDC:53
ISSN on article:0048-9697
DOI:10.1016/j.scitotenv.2024.170221 New window
NUK URN:URN:SI:UNG:REP:K4QKHFZO
Publication date in RUNG:02.02.2024
Views:987
Downloads:4
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Record is a part of a journal

Title:Science of the total environment
Shortened title:Sci. total environ.
Publisher:Elsevier
ISSN:0048-9697
COBISS.SI-ID:26369024 New window

Document is financed by a project

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:L1-4386
Name:CAEmissionMonitor – Določanje hitrosti primarnih emisij ogljičnih aerosolov in sekundarne produkcije organskih aerosolov

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:J2-2502
Name:Kvantitativne optične metode za napredno vrednotenje onesnaženosti zraka z delci v realnem času

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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