Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Time-resolved variations in the distributions of inorganic ions, carbonaceous components, dicarboxylic acids and related compounds in atmospheric aerosols from Sapporo, northern Japan during summertime
Abstract To better understand time-resolved variations of water-soluble organic aerosols in the atmosphere, we collected atmospheric particles (TSP) every 3 h during summertime (8–10 August, 2005) in Sapporo, northern Japan. We measured inorganic ions, carbonaceous components, dicarboxylic acids, ketoacids and α-dicarbonyls in TSP. SO4 2− was found as the most abundant ionic species (57 ± 9% of total ions determined) followed by NH4 + and NO3 −. However, none of the ionic species showed any diurnal trend throughout the campaign. Organic carbon (OC) ranged from 2.1 to 12.1 μg m−3 whereas elemental carbon (EC) was negligible in most of the samples (0.31 ± 0.56 μg m−3). Oxalic (C2) acid was the most abundant diacid species, followed by malonic (C3) and succinic (C4) acids. Water-soluble OC (WSOC), water-insoluble OC (WIOC) and OC as well as dominant diacids (C2–C4), total diacids, ketoacids and α-dicarbonyls did not show diurnal trend on 8 August, but they showed clear diurnal distributions during 9–10 August following the changes in ambient temperature (and radiation). Detailed analyses of time-resolved aerosols demonstrate that diurnal variations of organic aerosol compositions are caused by local in situ photochemical production, but are significantly superimposed by long-range atmospheric transport of aerosols, particularly when the air masses are enriched with emissions from higher plants and/or biomass burning, and their photochemical processing during the transport.
Highlights ► We studied time-resolved variations of chemical species of aerosols from Sapporo. ► Inorganic/organic aerosols showed different trends during the 3-day campaign. ► WSOC and diacid diurnal variations were caused by in situ photochemical production. ► Long-range transported aerosols of biogenic origin were superimposed on diurnal trend.
Time-resolved variations in the distributions of inorganic ions, carbonaceous components, dicarboxylic acids and related compounds in atmospheric aerosols from Sapporo, northern Japan during summertime
Abstract To better understand time-resolved variations of water-soluble organic aerosols in the atmosphere, we collected atmospheric particles (TSP) every 3 h during summertime (8–10 August, 2005) in Sapporo, northern Japan. We measured inorganic ions, carbonaceous components, dicarboxylic acids, ketoacids and α-dicarbonyls in TSP. SO4 2− was found as the most abundant ionic species (57 ± 9% of total ions determined) followed by NH4 + and NO3 −. However, none of the ionic species showed any diurnal trend throughout the campaign. Organic carbon (OC) ranged from 2.1 to 12.1 μg m−3 whereas elemental carbon (EC) was negligible in most of the samples (0.31 ± 0.56 μg m−3). Oxalic (C2) acid was the most abundant diacid species, followed by malonic (C3) and succinic (C4) acids. Water-soluble OC (WSOC), water-insoluble OC (WIOC) and OC as well as dominant diacids (C2–C4), total diacids, ketoacids and α-dicarbonyls did not show diurnal trend on 8 August, but they showed clear diurnal distributions during 9–10 August following the changes in ambient temperature (and radiation). Detailed analyses of time-resolved aerosols demonstrate that diurnal variations of organic aerosol compositions are caused by local in situ photochemical production, but are significantly superimposed by long-range atmospheric transport of aerosols, particularly when the air masses are enriched with emissions from higher plants and/or biomass burning, and their photochemical processing during the transport.
Highlights ► We studied time-resolved variations of chemical species of aerosols from Sapporo. ► Inorganic/organic aerosols showed different trends during the 3-day campaign. ► WSOC and diacid diurnal variations were caused by in situ photochemical production. ► Long-range transported aerosols of biogenic origin were superimposed on diurnal trend.
Time-resolved variations in the distributions of inorganic ions, carbonaceous components, dicarboxylic acids and related compounds in atmospheric aerosols from Sapporo, northern Japan during summertime
Pavuluri, Chandra Mouli (Autor:in) / Kawamura, Kimitaka (Autor:in) / Kikuta, Motomi (Autor:in) / Tachibana, Eri (Autor:in) / Aggarwal, Shankar G. (Autor:in)
Atmospheric Environment ; 62 ; 622-630
29.08.2012
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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