DOI: 10.1002/2013GB004574
Scopus记录号: 2-s2.0-84899037253
论文题名: The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica
作者: Winton V ; H ; L ; , Dunbar G ; B ; , Bertler N ; A ; N ; , Millet M ; -A ; , Delmonte B ; , Atkins C ; B ; , Chewings J ; M ; , Andersson P
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 4 起始页码: 423
结束页码: 436
语种: 英语
英文关键词: Antarctica
; dissolved iron
; dust
; iron solubility
; phytoplankton
; Ross Sea
Scopus关键词: Biomarkers
; Dust
; Phytoplankton
; Sea ice
; Solubility
; Antarctica
; Dissolved iron
; Iron fertilization
; Iron solubilities
; Mass accumulation rates
; Orders of magnitude
; Phytoplankton bloom
; Ross Sea
; Iron
; climate conditions
; concentration (composition)
; dissolution
; eolian deposit
; iron
; melting
; phytoplankton
; polynya
; primary production
; solubility
; Antarctica
; East Antarctica
; McMurdo Sound
; Ross Sea
; Southern Ocean
; algae
英文摘要: Iron is a limiting micronutrient for primary production in the Ross Sea, Antarctica. Recent observations reveal low dissolved Fe (dFe) concentrations in the Ross Sea polynya following high initial rates of primary production in summer, after the dFe winter reserve has been consumed. Significant new sources of dFe are therefore required to further sustain phytoplankton blooms. Iron from aeolian sand and dust (ASD) released from melting sea ice is one potential source. To constrain aeolian Fe inputs, we determined ASD mass accumulation rates and the total and soluble Fe content of ASD on sea ice in McMurdo Sound, southwestern (SW) Ross Sea. The mean mass accumulation rate was ~1.5 g m -2 yr-1, total Fe content of this ASD was 4 ± 1 wt %, and the percentage of soluble Fe was 11 ± 1%. Our mean estimate of the bulk aeolian dFe flux of 122.1 μmol m-2 yr-1 for the McMurdo Sound region suggests that aeolian Fe can support between 9.0 × 109 and 4.1 × 1011 mol C yr-1 (0.1-4.9 Tg C yr-1) of new primary production. This equates to only ~15% of new primary production in the SW Ross Sea, suggesting that aeolian dFe is a minor component of seasonal Fe supply. The very high ASD accumulation on sea ice in McMurdo Sound compared to other regions of Antarctica suggests that our results represent the upper limit of dFe supply to the ocean from this source in the Ross Sea. Key Points Fe sources are required to sustain phytoplankton blooms in the Ross Sea Local dust on sea ice contributes 2 orders of magnitude more than distal sources Fe solubility averages 11% resulting in a Fe flux of 6.8 mg m-2 yr-1 to SW Ross Sea ©2014. 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/77543
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; National Isotope Centre, GNS Science, Lower Hutt, New Zealand; Department of Imaging and Applied Physics, Curtin University, Perth WA, Australia; School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand; Durham University, Department of Earth Sciences, Durham, United Kingdom; Department of Earth and Environmental Sciences, University Milano-Bicocca, Milano, Italy; Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden
Recommended Citation:
Winton V,H,L,et al. The contribution of aeolian sand and dust to iron fertilization of phytoplankton blooms in southwestern Ross Sea, Antarctica[J]. Global Biogeochemical Cycles,2014-01-01,28(4)