DOI: 10.1016/j.atmosenv.2017.08.008
Scopus记录号: 2-s2.0-85029177148
论文题名: Homologous series of low molecular weight (C1-C10) monocarboxylic acids, benzoic acid and hydroxyacids in fine-mode (PM2.5) aerosols over the Bay of Bengal: Influence of heterogeneity in air masses and formation pathways
作者: Boreddy S ; K ; R ; , Mochizuki T ; , Kawamura K ; , Bikkina S ; , Sarin M ; M
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 167 起始页码: 170
结束页码: 180
语种: 英语
英文关键词: Bay of Bengal
; IGP-outflow
; LMW monoacids
; Primary source
; SEA-outflow
; Secondary source
Scopus关键词: Acetic acid
; Aerosols
; Atmospheric movements
; Molecular weight
; Organic acids
; pH
; Volatile organic compounds
; Bay of Bengal
; IGP-outflow
; LMW monoacids
; Primary sources
; SEA-outflow
; Secondary sources
; Benzoic acid
; acetic acid
; benzoic acid
; carboxylic acid
; formic acid
; hydroxyacid
; isovaleric acid
; nonanoic acid
; volatile organic compound
; air mass
; atmospheric transport
; biomass burning
; carboxylic acid
; concentration (composition)
; correlation
; heterogeneity
; microbial activity
; MODIS
; oxidation
; pollutant source
; satellite data
; volatile organic compound
; aerosol
; air sampling
; air temperature
; Article
; atmospheric transport
; bay
; biomass
; chemical analysis
; combustion
; comparative study
; concentration (parameters)
; controlled study
; fire ecology
; humidity
; microbial activity
; molecular weight
; particulate matter
; photooxidation
; primary organic aerosol
; priority journal
; secondary organic aerosol
; Southeast Asia
; winter
; Bay of Bengal
; Gangetic Plain
; Indian Ocean
; Southeast Asia
; Bacteria (microorganisms)
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Low molecular weight monocarboxylic acids (LMW monoacids) are most abundant volatile organic compounds (VOCs) in the atmosphere and often act as important contributors to the acidity of precipitation in addition to inorganic acids. However, there is a large uncertainty in the sources and secondary formations of these acids in the atmosphere. This study reports homologous series of LMW monoacids, including normal (C1-C10), branched chain (iC4-iC6), aromatic (benzoic acid) and hydroxyacids (lactic and glycolic acids) in the fine-mode (PM2.5) aerosols collected over the Bay of Bengal (BoB) during a winter cruise (December 2008 to January 2009). The samples were associated with two distinct continental air masses arriving from the Indo-Gangetic Plain (IGP-outflow) and Southeast Asia (SEA-outflow). The molecular distributions of organic acids are characterized by the dominance of formic acid (C1) followed by acetic acid (C2) and nonanoic acid (C9) in the IGP-outflow, whereas dominance of C1 or C9 was observed in the SEA-outflow followed by C2. Formic-to-acetic acid (C1/C2) ratios were higher than unity (mean: 1.3 ± 0.3) in the IGP-outflow, whereas they were less than unity (0.9 ± 0.5) in the SEA-outflow. These results suggest that secondary formation of organic acids is largely important in the IGP-outflow whereas primary emission is a major source of organic acids in the SEA-outflow. Based on the correlation coefficient matrix analysis and C1/C2 and C4/C3 ratios, we consider that the sources of C1 are probably associated with the secondary formation via the oxidation of biogenic VOCs, while C2 has both primary and secondary formations associated with anthropogenic sources in the IGP-outflow. On the other hand, C1 and C2 have similar sources (both primary and secondary) originated from biomass burning and bacterial activities via long-range atmospheric transport in the SEA-outflow, as inferred from the MODIS fire spot data, significant concentrations of isovaleric acid (iC5), and a significant correlation (r = 0.67) between nss-K+ and total LMW monoacids. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82397
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Physical Research Laboratory, Ahmadabad, India
Recommended Citation:
Boreddy S,K,R,et al. Homologous series of low molecular weight (C1-C10) monocarboxylic acids, benzoic acid and hydroxyacids in fine-mode (PM2.5) aerosols over the Bay of Bengal: Influence of heterogeneity in air masses and formation pathways[J]. Atmospheric Environment,2017-01-01,167