globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2101
论文题名:
Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing
作者: Tagliabue A.; Sallée J.-B.; Bowie A.R.; Lévy M.; Swart S.; Boyd P.W.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:4
起始页码: 314
结束页码: 320
语种: 英语
Scopus关键词: deep mixing method ; diffusion ; iron ; marine ecosystem ; primary production ; surface water ; Southern Ocean
英文摘要: Low levels of iron limit primary productivity across much of the Southern Ocean. At the basin scale, most dissolved iron is supplied to surface waters from subsurface reservoirs, because land inputs are spatially limited. Deep mixing in winter together with year-round diffusion across density surfaces, known as diapycnal diffusion, are the main physical processes that carry iron-laden subsurface waters to the surface. Here, we analyse data on dissolved iron concentrations in the top 1,000 m of the Southern Ocean, taken from all known and available cruises to date, together with hydrographic data to determine the relative importance of deep winter mixing and diapycnal diffusion to dissolved iron fluxes at the basin scale. Using information on the vertical distribution of iron we show that deep winter mixing supplies ten times more iron to the surface ocean each year, on average, than diapycnal diffusion. Biological observations from the sub-Antarctic sector suggest that following the depletion of this wintertime iron pulse, intense iron recycling sustains productivity over the subsequent spring and summer. We conclude that winter mixing and surface-water iron recycling are important drivers of temporal variations in Southern Ocean primary production. © 2014 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106626
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Earth, School of Environmental Sciences, University of Liverpool, Liverpool, L69 3GP, United Kingdom; Southern Ocean Carbon and Climate Observatory, CSIR, Stellenbosch 7599, South Africa; Sorbonne Universit 2010s, UPMC Univ, Paris 06, UMR 7159, LOCEAN-IPSL, F-75005, Paris, France; CNRS, UMR 7159, LOCEAN-IPSL, F-75005, Paris, France; British Antarctic Survey, High Cross, Cambridge, CB3 0ET, United Kingdom; Antarctic Climate and Ecosystems CRC, University of Tasmania, Private Bag 80, Hobart, TAS 7001, Australia; Department of Oceanography, Marine Research Institute, University of Cape Town, Rondebosch 7701, South Africa; NIWA Centre of Chemical and Physical Oceanography, Department of Chemistry, University of Otago, Dunedin 9016, New Zealand; Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia

Recommended Citation:
Tagliabue A.,Sallée J.-B.,Bowie A.R.,et al. Surface-water iron supplies in the Southern Ocean sustained by deep winter mixing[J]. Nature Geoscience,2014-01-01,7(4)
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