DOI: 10.1016/j.atmosenv.2017.09.001
Scopus记录号: 2-s2.0-85029096301
论文题名: Diurnal variability of gas phase and surface water ethanol in southeastern North Carolina, USA
作者: Kieber R ; J ; , Powell J ; P ; , Foley L ; , Mead R ; N ; , Willey J ; D ; , Avery G ; B
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 168 起始页码: 55
结束页码: 61
语种: 英语
英文关键词: Acetaldehyde
; Ethanol
; Photochemistry
; Temporal variability
Scopus关键词: Ethanol
; Gases
; Meteorological problems
; Photochemical reactions
; Surface waters
; Atmospheric depositions
; Biogeochemical cycling
; Ethanol concentrations
; Gas-phase concentration
; Photochemical process
; Photochemical production
; Simultaneous analysis
; Temporal variability
; Acetaldehyde
; acetaldehyde
; alcohol
; hydroxyl radical
; surface water
; acetaldehyde
; atmospheric chemistry
; biofuel
; biogeochemical cycle
; chemical process
; concentration (composition)
; diurnal variation
; ethanol
; freshwater
; gas
; microlayer
; photochemistry
; surface water
; temporal variation
; alcohol consumption
; Article
; atmospheric deposition
; biogeochemical cycling
; circadian rhythm
; exhaust gas
; gas
; limit of detection
; North Carolina
; photochemistry
; photolysis
; physical phase
; priority journal
; sunlight
; surface property
; troposphere
; Cape Fear River
; North Carolina
; North Carolina
; United States
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: Diurnal variations in gas phase and surface water concentrations of ethanol and acetaldehyde were investigated at five locations in southeastern North Carolina, USA. There were distinct diurnal oscillations observed in gas phase concentrations with maxima occurring in late afternoon suggesting that photochemical production is an important process in the cycling of these analytes in the troposphere. The rapid decrease in concentrations after the mid day maximum suggests that there is also an atmospheric photochemical sink for both analytes most likely involving photo produced hydroxyl radicals with a half-life on the order of hours rather than days at ground level. Ethanol concentrations in the surface microlayer taken at the same time as gas phase samples had a very similar diurnal profile suggesting photochemical processes, in addition to atmospheric deposition, play a role in the aqueous phase cycling of both analytes. The concentration of ethanol and acetaldehyde increased significantly in flasks containing freshwater collected from the Cape Fear River exposed to simulated sunlight for 6 h underscoring the importance of in situ photochemical production. Results of this study are significant because they represent the first simultaneous analyses of the temporal variability of ethanol and acetaldehyde concentrations in the gas and aqueous phases. These measurements are essential in order to better define the processes involved in the global biogeochemical cycling of ethanol both now and in the future as our use of the biofuel continues to grow. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82445
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, NC, United States
Recommended Citation:
Kieber R,J,, Powell J,et al. Diurnal variability of gas phase and surface water ethanol in southeastern North Carolina, USA[J]. Atmospheric Environment,2017-01-01,168