20.500.12556/RUL-154816 Contribution of black carbon and desert dust to aerosol absorption in the atmosphere of the Eastern Arabian Peninsula 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 ($b_{abs}$) 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. aerosol absorption black carbon mineral dust desert dust Arabian Peninsula true false true Angleški jezik Angleški jezik Članek v reviji 2024-03-04 10:38:42 2024-03-04 10:38:43 2024-03-05 03:48:12 0000-00-00 00:00:00 2024 0 0 18 str. art. no. ǂ120427 Vol. 324 May 2024 0000-00-00 Zaloznikova NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2024-03-02 502.3/.7 1352-2310 10.1016/j.atmosenv.2024.120427 187285507 1-s2.0-S135223102400102X-main.pdf 1-s2.0-S135223102400102X-main.pdf 1 618E35977826B66179A9B3E69A6C1814 1abd0346ce870f7029b8d7c18e66acaafaa460f9746762777a1e2463a512e804 940eeaab-da0b-11ee-b2ad-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=181413 https://www.sciencedirect.com/science/article/pii/S135223102400102X 0 c2367fad-da0b-11ee-b2ad-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=181414 Fakulteta za matematiko in fiziko 0 0 0