DOI: 10.1002/2015GB005265
Scopus记录号: 2-s2.0-84959489479
论文题名: Multiple sources of soluble atmospheric iron to Antarctic waters
作者: Winton V ; H ; L ; , Edwards R ; , Delmonte B ; , Ellis A ; , Andersson P ; S ; , Bowie A ; , Bertler N ; A ; N ; , Neff P ; , Tuohy A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 3 起始页码: 421
结束页码: 437
语种: 英语
英文关键词: Antarctica
; black carbon
; dust
; iron
; Roosevelt Island
; Ross Sea
Scopus关键词: aerosol
; aluminum
; atmospheric deposition
; biological uptake
; black carbon
; dust
; growth
; iron
; isotopic ratio
; particle size
; phytoplankton
; pollutant source
; seasonal variation
; seasonality
; size distribution
; Antarctica
; Roosevelt Island [West Antarctica]
; Ross Sea
; Southern Ocean
; Southern Ocean
; West Antarctica
英文摘要: The Ross Sea, Antarctica, is a highly productive region of the Southern Ocean. Significant new sources of iron (Fe) are required to sustain phytoplankton blooms in the austral summer. Atmospheric deposition is one potential source. The fractional solubility of Fe is an important variable determining Fe availability for biological uptake. To constrain aerosol Fe inputs to the Ross Sea region, fractional solubility of Fe was analyzed in a snow pit from Roosevelt Island, eastern Ross Sea. In addition, aluminum, dust, and refractory black carbon (rBC) concentrations were analyzed, to determine the contribution of mineral dust and combustion sources to the supply of aerosol Fe. We estimate exceptionally high dissolved Fe (dFe) flux of 1.2 × 10-6 g m-2 y-1 and total dissolvable Fe flux of 140 × 10-6 g m-2 y-1 for 2011/2012. Deposition of dust, Fe, Al, and rBC occurs primarily during spring-summer. The observed background fractional Fe solubility of ~0.7% is consistent with a mineral dust source. Radiogenic isotopic ratios and particle size distribution of dust indicates that the site is influenced by local and remote sources. In 2011/2012 summer, relatively high dFe concentrations paralleled both mineral dust and rBC deposition. Around half of the annual aerosol Fe deposition occurred in the austral summer phytoplankton growth season; however, the fractional Fe solubility was low. Our results suggest that the seasonality of dFe deposition can vary and should be considered on longer glacial-interglacial timescales. © 2016. 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/77868
Appears in Collections: 气候变化事实与影响
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作者单位: Physics and Astronomy, Curtin University, Perth, WA, Australia; DISAT, Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy; Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden; Antarctic Climate and Ecosystems CRC, Hobart, TAS, Australia; Institute for Antarctic and Southern Ocean Studies, University of Tasmania, Hobart, TAS, Australia; Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; National Isotope Centre, GNS Science, Lower Hutt, New Zealand; Now at Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, United States
Recommended Citation:
Winton V,H,L,et al. Multiple sources of soluble atmospheric iron to Antarctic waters[J]. Global Biogeochemical Cycles,2016-01-01,30(3)