DOI: 10.1002/2013JD019864
论文题名: The atmospheric HCHO budget at Dumont d'Urville (East Antarctica): Contribution of photochemical gas-phase production versus snow emissions
作者: Preunkert S. ; Legrand M. ; Pépy G. ; Gallée H. ; Jones A. ; Jourdain B.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 23 起始页码: 13319
结束页码: 13337
语种: 英语
英文关键词: atmospheric HCHO
; coastal Antarctica
; oxidative capacity
Scopus关键词: Atmospheric chemistry
; Chemical reactions
; Methane
; Snow
; Antarctic coasts
; Antarctica
; Contamination-free
; Dimethyl sulfide
; East antarctica
; Methane oxidation
; Oxidative capacity
; Zero-dimensional
; Gas emissions
; ambient air
; atmospheric chemistry
; boundary layer
; coastal zone
; formaldehyde
; gas phase reaction
; methane
; oxidation
; photochemistry
; seasonality
; snow
; snowpack
; Antarctica
; Dumont d'Urville
; East Antarctica
; Spheniscidae
英文摘要: HCHO was monitored throughout the year 2009 at the coastal East Antarctic site of Dumont d'Urville (DDU) using Aerolaser AL-4021 analyzers. The accurate determination of less than 100 pptv required optimization of the analyzers, in particular, to minimize effects of changing ambient temperatures. The impact of station activities and of the presence of large penguin colonies at the site in summer was scrutinized. The obtained contamination-free record indicates monthly means close to 50 pptv from May to September and a maximum of 200 pptv in January. Zero-dimensional and 2-D calculations suggest that in summer, the largest HCHO source is the gas-phase photochemistry (80%) mainly driven by methane oxidation, which is considerably greater than from snow emissions (20%). The influence of light alkenes, dimethyl sulfide, and halogens remains weak. In winter, snow emissions represent the main HCHO source (70%). These findings are compared to previous studies conducted at the West Antarctic coast. It is shown that in summer the HCHO production from methane chemistry is 3 times more efficient at DDU than at the west coast due to more frequent arrival of oxidant-rich air masses from inland Antarctica. Halogen chemistry is found to represent a weak HCHO sink at both West and East Antarctica. Compared to DDU, the shallower atmospheric boundary layer and the less efficient gas-phase production at the west coast make the snow pack the dominant HCHO source (85%) compared to gas-phase photochemistry (15%) there in summer. Key Points HCHO at coastal East Antarctica is mainly produced by CH4 oxidation in summer Snow HCHO emission contributes more at west than at east coastal Antarctica ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63114
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: CNRS/UJF-Grenoble 1, Laboratoire de Glaciologie et Géophysique de l'Environnement, UMR 5183, Grenoble, FR-38041, France; British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom
Recommended Citation:
Preunkert S.,Legrand M.,Pépy G.,et al. The atmospheric HCHO budget at Dumont d'Urville (East Antarctica): Contribution of photochemical gas-phase production versus snow emissions[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(23)