干旱区生态环境知识资源中心(Arid): Resupply of mesopelagic dissolved iron controlled by particulate iron composition

Arid

DOI	10.1038/s41561-019-0476-6
	Resupply of mesopelagic dissolved iron controlled by particulate iron composition
	Bressac, M.1,2; Guieu, C.2,3; Ellwood, M. J.4; Tagliabue, A.5; Wagener, T.6; Laurenceau-Cornec, E. C.1; Whitby, H.7; Sarthou, G.7; Boyd, P. W.1,8
通讯作者	Bressac, M.
来源期刊	NATURE GEOSCIENCE
ISSN	1752-0894
EISSN	1752-0908
出版年	2019
卷号	12 期号:12 页码:995-+
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.
类型	Article
语种	英语
国家	Australia ; France ; U Arab Emirates ; England
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000499653700009
WOS关键词	POLAR FRONTAL ZONES ; DUST-DEPOSITION ; SOUTHERN-OCEAN ; MEDITERRANEAN SEA ; SEDIMENT TRAP ; CARBON SEQUESTRATION ; REMINERALIZATION ; BIOGEOCHEMISTRY ; FLUXES ; EXPORT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2019-12-01
来源机构	French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311169
作者单位	1.Univ Tasmania, Inst Marine & Antarct Studies, Hobart, Tas, Australia; 2.Sorbonne Univ, CNRS, LOV, Villefranche Sur Mer, France; 3.New York Univ Abu Dhabi, Ctr Prototype Climate Modeling, Abu Dhabi, U Arab Emirates; 4.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia; 5.Univ Liverpool, Sch Environm Sci, Dept Earth Ocean & Ecol Sci, Liverpool, Merseyside, England; 6.Univ Toulon & Var, Aix Marseille Univ, CNRS, IRD,MIO,UM 110, Marseille, France; 7.IFREMER, CNRS, UMR 6539, LEMAR,IUEM,UBO,IRD, Technopole Brest Iroise, Plouzane, France; 8.Univ Tasmania, Antarctic Climate & Ecosyst Collaborat Res Ctr, 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]. French National Research Institute for Sustainable Development,2019,12(12):995-+.
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),995-+.
MLA	Bressac, M.,et al."Resupply of mesopelagic dissolved iron controlled by particulate iron composition".NATURE GEOSCIENCE 12.12(2019):995-+.