DOI: 10.1002/jgrd.50716
论文题名: Seasonal variations in 35S and Δ17O of sulfate aerosols on the Antarctic plateau
作者: Hill-Falkenthal J. ; Priyadarshi A. ; Savarino J. ; Thiemens M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 16 起始页码: 9444
结束页码: 9455
语种: 英语
Scopus关键词: Aerosols
; Oxidation
; Sulfur
; Sulfur dioxide
; Sun
; Antarctic plateau
; Long range transport
; Measurements of
; Oxidation mechanisms
; Ozone oxidation
; Photochemical activity
; Seasonal variation
; Sulfate aerosols
; Troposphere
; aerosol
; hydrogen peroxide
; long range transport
; oxidation
; oxygen isotope
; ozone
; photochemistry
; seasonal variation
; solar radiation
; stratosphere
; sulfate
; sulfur isotope
; troposphere
; vertical mixing
; Antarctic Plateau
; Antarctica
; Dome Concordia
; East Antarctica
英文摘要: The first reported seasonal Δ17O anomaly in sulfate aerosols and measurements of radioactive 35SO4 2- activities collected from Dome C, Antarctica, are reported. Δ17O values exhibit minima during summer (as low as 0.91%) when tropospheric oxidation patterns are dominated by OH/H2O2 mechanisms. Significant enrichment during autumn and spring is observed (up to 2.40%) as ozone oxidation increases in the troposphere relative to summer and both stratospheric sources and long-range transport become more significant to the total sulfate budget. An unexpected decrease in Δ17O is seen as winter progresses. This decline is concluded to potentially arise due to a reduction in vertical mixing in the troposphere or linked to variations in the long-range transport of sulfur species to Antarctica. 35SO 4 2- activities exhibit maxima during summer (up to 1219 atoms 35S/m3) that correlate with the peak in stratospheric flux and minima during winter (as low as 146 atoms 35S/m3) when the lack of solar radiation substantially reduces photochemical activity. It is shown that 35S offers the potential to be used as an additional tracer to study stratospheric and tropospheric interactions and is used to estimate stratospheric input of sulfur (combination of SO2 and SO4 2-). Stratospheric sulfur input produces maxima during summer/autumn with an upper limit of 5.5 ng/m3 and minima during winter/spring with an upper limit of 1.1 ng/m3. From these results, it is concluded that the variation in Δ17O is more reliant upon shifts in tropospheric oxidation mechanisms and long-range transport than on changes in the stratospheric flux. © 2013. Her Majesty the Queen in Right of Canada. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63379
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: Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Dr., San Diego, CA 92093, United States; Laboratoire de Glaciologie et Géophysique de l'Environmnement, CNRS, Université Joseph Fourier-Grenoble, St.-Martin d'Heres, France
Recommended Citation:
Hill-Falkenthal J.,Priyadarshi A.,Savarino J.,et al. Seasonal variations in 35S and Δ17O of sulfate aerosols on the Antarctic plateau[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(16)