DOI: 10.1016/j.atmosres.2017.11.003
Scopus记录号: 2-s2.0-85034592639
论文题名: Dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls in fine aerosols over central Alaska: Implications for sources and atmospheric processes
作者: Deshmukh D.K. ; Mozammel Haque M. ; Kawamura K. ; Kim Y.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 202 起始页码: 128
结束页码: 139
语种: 英语
英文关键词: Biogenic sources
; Biomass burning
; PM2.5 aerosols
; Primary sources
; Secondary sources
; Water-soluble organic compounds
Scopus关键词: Aerosols
; Atmospheric aerosols
; Atmospheric chemistry
; Atmospheric radiation
; Biomass
; Fossil fuels
; Fuels
; Organic acids
; Organic carbon
; Organic chemicals
; Photooxidation
; Produced Water
; Biomass burning emissions
; Biomass-burning
; Cloud formation process
; Photochemical processing
; Primary sources
; Regional radiative forcing
; Secondary sources
; Water soluble organic compounds
; Oxalic acid
; aerosol composition
; biogenic emission
; biomass burning
; organic compound
; particle size
; point source
; radiative forcing
; Alaska
; United States
英文摘要: The presence of water-soluble dicarboxylic acids in atmospheric aerosols has a significant influence on the regional radiative forcing through direct aerosol effect and cloud formation process. Fine aerosol (PM2.5) samples collected in central Alaska (Fairbanks: 64.51°N and 147.51°W) during summer of 2009 were measured for water-soluble diacids (C2–C12), oxoacids (C2–C9) and α-dicarbonyls (C2–C3) as well as elemental carbon (EC), organic carbon (OC) and water-soluble OC (WSOC) to assess their sources and formation processes. We found the predominance of oxalic acid (C2) followed by malonic (C3) and succinic acid (C4) in Alaskan aerosols. Higher C3/C4 diacid ratios (ave. 1.2) in Alaskan aerosols than those reported for fresh aerosols emitted from fossil fuel combustion (ave. 0.35) and biomass burning (0.51–0.66) suggest that organic aerosols in central Alaska were photochemically processed. The relatively high correlations of major diacids and related compounds with levoglucosan (r = 0.80–0.99) than those with 2-methylglyceric acid (r = 0.59–0.98) suggest that they were significantly produced from biomass burning emission. Strong correlations of C2 with normal-chain saturated diacids (C3-C9: r = 0.80–0.98), glyoxylic acid (ωC2: r = 0.95) and methylglyoxal (MeGly: r = 0.88), together with strong correlations of solar radiation with ratio of C2 to C2–C12 diacids (r = 0.83), ωC2 (r = 0.80) and MeGly (r = 0.82) suggest that oxalic acid in PM2.5 aerosol was produced by the photooxidation of higher homologous diacids, glyoxylic acid and methylglyoxal in the atmosphere of central Alaska. These results reveal that photochemical processing of organic precursors mainly produced from biomass burning control the water-soluble organic chemical composition of fine aerosols in central Alaska. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108979
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Chubu Institute for Advanced Studies, Chubu University, Kasugai, 487-8501, Japan; Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, United States
Recommended Citation:
Deshmukh D.K.,Mozammel Haque M.,Kawamura K.,et al. Dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls in fine aerosols over central Alaska: Implications for sources and atmospheric processes[J]. Atmospheric Research,2018-01-01,202