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Title:Contribution of black carbon and desert dust to aerosol absorption in the atmosphere of the Eastern Arabian Peninsula
Authors:ID Mahfouz, Mohamed M. K. (Author)
ID Skok, Gregor (Author)
ID Sciare, Jean (Author)
ID Pikridas, Michael (Author)
ID Alfarra, M. R. (Author)
ID Moosakutty, Shamjad (Author)
ID Alföldy, Bálint (Author)
ID Ivančič, Matic (Author)
ID Rigler, Martin (Author)
ID Gregorič, Asta (Author)
ID Podlipec, Rok (Author)
ID Močnik, Griša (Author)
Files:.pdf Mahfouz_-_AE_2024_-_proof_-_Contribution_of_BC_and_desert_dust_to_aerosol_absorption_in_Arabian_Peninsula.pdf (3,52 MB)
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Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Discriminating the absorption coefficients of aerosol mineral dust and black carbon (BC) in different aerosol size fractions is a challenge because of BC's large mass absorption cross-section compared to dust. Ambient aerosol wavelength dependent absorption coefficients in supermicron and submicron size fractions were determined with a high time resolution. The measurements were performed simultaneously using identical systems at an urban and a regional background site in Qatar. At each site, measurements were taken by co-located Aethalometers, one with a virtual impactor (VI) and the other with a PM1 cyclone to respectively collect super-micron-enhanced and submicron fractions. The combined measurement of aerosol absorption and scattering coefficients enabled the particles to be classified based on their optical properties' wavelength dependence. The classification reveals the presence of BC internally/externally mixed with different aerosols. Helium ion microscopy images provided information concerning the extent of mineral dust in the submicron fraction. The determination of absorption coefficients during dust storms and non-dust periods was used to establish the absorption Ångström exponent for dust and BC. Non-parametric wind regression, potential source contribution function and back-trajectory analysis reveal major regional sources of desert dust associated with north-westerly winds and a minor local dust contribution. In contrast, major BC sources found locally were associated with south-westerly winds with a smaller contribution made by offshore emissions transported by north-easterly and easterly winds. The use of a pair of Aethalometers with VI and PM1 inlets separates contributions of BC and dust to the aerosol absorption coefficient.
Keywords:aerosol absorption, black carbon, mineral dust, desert dust, Arabian Peninsula
Publication status:Published
Publication version:Version of Record
Publication date:01.05.2024
Year of publishing:2024
Number of pages:18 str.
Numbering:Vol. 324, article no. ǂ120427
PID:20.500.12556/RUNG-8908-ad95d3af-3cef-9a3e-2cfb-4888c2bfbc65 New window
COBISS.SI-ID:187285507 New window
ISSN on article:1352-2310
DOI:10.1016/j.atmosenv.2024.120427 New window
Publication date in RUNG:29.02.2024
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Record is a part of a journal

Title:Atmospheric environment
Shortened title:Atmos. environ.
COBISS.SI-ID:16086277 New window


Licensing start date:01.02.2024

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:27.02.2024