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• W2247489727 abstract "Abstract Light absorption properties of carbonaceous aerosol strongly influence the Earth's radiative balance, yet the related knowledge is limited for the Tibetan Plateau (TP), the highest and largest plateau in the world. In this study, organic carbon (OC), elemental carbon (EC) and water soluble organic carbon (WSOC) of PM 2.5 and PM 10 of Lhasa collected from May 2013 to March 2014 were studied. It showed that daily-average concentrations of OC, EC and WSOC of PM 2.5 and PM 10 were lower than those of other megacities. Lhasa PM 2.5 was characterized by low OC/EC ratio (1.46 ± 0.55), which was similar to that of Lhasa roadside PM 2.5 (1.25 ± 0.45), reflecting mainly direct influence of primary emissions and less secondary formation. Hence, although Lhasa atmosphere is relatively clean, it is intensively influenced by local vehicle emissions. Mass absorption cross-section of EC (MAC EC ) for both PM 2.5 and PM 10 at 632 nm were 7.19 ± 1.19 m 2  g −1 and 7.98 ± 2.32 m 2  g −1 , respectively, both of which had similar variation patterns to OC/EC and secondary OC (SOC)/OC, indicating that the increase of MAC EC might be caused by coating with organic aerosol. Additionally, the loading of EC for both PM 2.5 and PM 10 showed logarithmic relationships with those of optical attenuation (ATN) of EC, implying that the shadowing effect enhanced logarithmic with increased EC concentration. MAC of WSOC at 365 nm for PM 2.5 (0.74 ± 0.22 m 2  g −1 ) and PM 10 (0.78 ± 0.21 m 2  g −1 ) were also close to reported values of other cities mainly influenced by fossil combustion. Additionally, attenuation at 365 nm of WSOC of both PM 2.5 and PM 10 showed the same relationship with their WSOC concentrations, implying no difference for light absorption properties of WSOC for these two grain sizes." @default.
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• W2247489727 date "2016-02-01" @default.
• W2247489727 modified "2023-10-03" @default.
• W2247489727 title "Concentrations and light absorption characteristics of carbonaceous aerosol in PM 2.5 and PM 10 of Lhasa city, the Tibetan Plateau" @default.
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• W2247489727 doi "https://doi.org/10.1016/j.atmosenv.2015.12.059" @default.
• W2247489727 hasPublicationYear "2016" @default.
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