DOI: 10.1002/2013JD020367
论文题名: Spatial and particle size distributions of atmospheric dissolvable iron in aerosols and its input to the Southern Ocean and coastal East Antarctica
作者: Gao Y. ; Xu G. ; Zhan J. ; Zhang J. ; Li W. ; Lin Q. ; Chen L. ; Lin H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 22 起始页码: 12634
结束页码: 12648
语种: 英语
英文关键词: aerosols
; atmospheric deposition
; atmospheric iron
; coastal East Antarctica
; Southern Ocean
Scopus关键词: Aerosols
; Deposition
; Dissolution
; Inductively coupled plasma
; Iron
; Mass spectrometry
; Meteorological problems
; Size distribution
; Solubility
; Atmospheric depositions
; Average concentration
; Bimodal size distribution
; East antarctica
; Fine-mode particles
; Southern ocean
; Total dissolvable fe
; UV/visible spectroscopy
; Atmospheric aerosols
; air-sea interaction
; atmospheric deposition
; coastal zone
; concentration (composition)
; dust
; inductively coupled plasma method
; iron
; marine atmosphere
; particle size
; seasonal variation
; size distribution
; solubility
; spatial distribution
; Antarctica
; East Antarctica
; Southern Ocean
英文摘要: To characterize atmospheric dissolvable iron over the Southern Ocean (SO) and coastal East Antarctica (CEA), bulk and size-segregated (0.056-18 μm in diameter) aerosols were collected from 34°S, 109°E to 69°S, 76°E and between 69°S, 76°E and 66°S, 110°E during a cruise during November 2010 to March 2011. Aerosols were analyzed for total dissolvable Fe and Fe(II) by UV/Visible spectroscopy and total Fe by inductively coupled plasma-mass spectrometry. The average concentrations of total Fe were 19 ng m-3 (range: 10-38 ng m-3) over the SO and 26 ng m -3 (range: 14-56 ng m-3) in CEA. The average Fe(II) concentrations were 0.22 ng m-3 (range: 0.13-0.33 ng m-3) over the SO and 0.53 ng m-3 (range: 0.18-1.3 ng m-3) over CEA; the total dissolvable Fe followed the same trend. Over the SO, a single-peak size distribution of Fe(II) existed. Over CEA, a bimodal size distribution of Fe(II) appeared, with the first peak at 0.32-0.56 μm and the second peak at 5.6-10 μm. Higher Fe concentrations over CEA than over the SO and the existence of coarse mode Fe(II) over CEA suggest potential dust sources in Antarctica. The fractional Fe(II) solubility ranged from 0.58% to 6.5% and decreased with total Fe concentration increase. The estimated atmospheric fluxes of Fe(II) were 0.007-0.092 mg m-2 yr-1 over the SO and 0.022-0.21 mg m-2 yr-1 in CEA. Total dissolvable Fe fluxes were 0.007-0.52 mg m-2 yr-1 over the SO. The atmospheric dissolvable Fe input contributes to the dissolved Fe pool in the SO surface waters. Key Points Dissolved Fe in aerosols is accumulated in fine-mode particles Fe solubility and Fe concentration are higher in coastal Antarctica Air-to-sea fluxes of dissolved Fe is dominated by Fe(II) deposition ©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/63162
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 Earth and Environmental Sciences, Rutgers University, 101 Warren Street, Newark, NJ 07102, United States; Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, State Oceanic Administration, Xiamen, China
Recommended Citation:
Gao Y.,Xu G.,Zhan J.,et al. Spatial and particle size distributions of atmospheric dissolvable iron in aerosols and its input to the Southern Ocean and coastal East Antarctica[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(22)