气候变化领域集成服务门户(CCPortal): Resupply of mesopelagic dissolved iron controlled by particulate iron composition

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DOI	10.1038/s41561-019-0476-6
	Resupply of mesopelagic dissolved iron controlled by particulate iron composition
	Bressac M.; Guieu C.; Ellwood M.J.; Tagliabue A.; Wagener T.; Laurenceau-Cornec E.C.; Whitby H.; Sarthou G.; Boyd P.W.
发表日期	2019
ISSN	17520894
卷号	12 期号:12
英文摘要	The dissolved iron supply controls half of the oceans’ primary productivity. Resupply by the remineralization of sinking particles, and subsequent vertical mixing, largely sustains this productivity. However, our understanding of the drivers of dissolved iron resupply, and their influence on its vertical distribution across the oceans, is still limited due to sparse observations. There is a lack of empirical evidence as to what controls the subsurface iron remineralization due to difficulties in studying mesopelagic biogeochemistry. Here we present estimates of particulate transformations to dissolved iron, concurrent oxygen consumption and iron-binding ligand replenishment based on in situ mesopelagic experiments. Dissolved iron regeneration efficiencies (that is, replenishment over oxygen consumption) were 10- to 100-fold higher in low-dust subantarctic waters relative to higher-dust Mediterranean sites. Regeneration efficiencies are heavily influenced by particle composition. Their make-up dictates ligand release, controls scavenging, modulates ballasting and may lead to the differential remineralization of biogenic versus lithogenic iron. At high-dust sites, these processes together increase the iron remineralization length scale. Modelling reveals that in oceanic regions near deserts, enhanced lithogenic fluxes deepen the ferricline, which alter the vertical patterns of dissolved iron replenishment, and set its redistribution at the global scale. Such wide-ranging regeneration efficiencies drive different vertical patterns in dissolved iron replenishment across oceanic provinces. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	biogenic material; chemical composition; desert; dissolved load; dust; iron; ligand; oxygen consumption; primary production; remineralization; subantarctic region; vertical distribution; Mediterranean Region; oceanic regions
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124560
作者单位	Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, Villefranche-sur-Mer, France; The Center for Prototype Climate Modeling, New York University in Abu Dhabi, Abu Dhabi, United Arab Emirates; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; Department of Earth Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom; Aix Marseille Université, CNRS, IRD, Université de Toulon, MIO UM 110, Marseille, France; UMR 6539/LEMAR/IUEM, CNRS, UBO, IRD, Ifremer, Technopôle Brest Iroise, Plouzané, France; Antarctic Climate and Ecosystems Collaborative Research Center, University of Tasmania, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Bressac M.,Guieu C.,Ellwood M.J.,et al. Resupply of mesopelagic dissolved iron controlled by particulate iron composition[J],2019,12(12).
APA	Bressac M..,Guieu C..,Ellwood M.J..,Tagliabue A..,Wagener T..,...&Boyd P.W..(2019).Resupply of mesopelagic dissolved iron controlled by particulate iron composition.Nature Geoscience,12(12).
MLA	Bressac M.,et al."Resupply of mesopelagic dissolved iron controlled by particulate iron composition".Nature Geoscience 12.12(2019).