气候变化领域集成服务门户(CCPortal): An intermediate-depth source of hydrothermal 3He and dissolved iron in the North Pacific

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DOI	10.1016/j.epsl.2020.116223
	An intermediate-depth source of hydrothermal 3He and dissolved iron in the North Pacific
	Jenkins W.J.; Hatta M.; Fitzsimmons J.N.; Schlitzer R.; Lanning N.T.; Shiller A.; Buckley N.R.; German C.R.; Lott D.E.; III; Weiss G.; Whitmore L.; Casciotti K.; Lam P.J.; Cutter G.A.; Cahill K.L.
发表日期	2020
ISSN	0012821X
卷号	539
英文摘要	We observed large water column anomalies in helium isotopes and trace metal concentrations above the Loihi Seamount. The 3He/4He of the added helium was 27.3 times the atmospheric ratio, clearly marking its origin to a primitive mantle plume. The dissolved iron to 3He ratio (dFe:3He) exported to surrounding waters was 9.3±0.3×106. We observed the Loihi 3He and dFe “signal” at a depth of 1100 m at several stations within ∼100 – 1000 km of Loihi, which exhibited a distal dFe:3He ratio of ∼4×106, about half the proximal ratio. These ratios were remarkably similar to those observed over and near the Southern East Pacific Rise (SEPR) despite greatly contrasting geochemical and volcanic-tectonic origins. In contrast, the proximal and distal dMn:3He ratios were both ∼1×106, less than half of that observed at the SEPR. Dissolved methane was minimally enriched in waters above Loihi Seamount and was distally absent. Using an idealized regional-scale model we replicated the historically observed regional 3He distribution, requiring a hydrothermal 3He source from Loihi of 10.4 ± 4.2 mol a−1, ∼2% of the global abyssal hydrothermal 3He flux. From this we compute a corresponding dFe flux of ∼40 Mmol a−1. Global circulation model simulations suggest that the Loihi-influenced waters eventually upwell along the west coast of North America, also extending into the shallow northwest Pacific, making it a possibly important determinant of marine primary production in the subpolar North Pacific. © 2020 Elsevier B.V.
关键词	helium isotopes marine primary productivity North Pacific circulation seawater dissolved iron and manganese submarine hydrothermal vents
英文关键词	Helium; Hot springs; Iron; Isotopes; Submarine geology; Trace analysis; Trace elements; Dissolved iron; Helium isotopes; Hydrothermal vent; North Pacific; Primary productivity; Dissolution; concentration (composition); dissolved matter; helium isotope; hydrothermal vent; iron; manganese; seawater; trace metal; Pacific Ocean; Pacific Ocean (North)
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202675
作者单位	Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Oceanography, University of Hawaii at ManoaHI 96822, United States; Department of Oceanography, Texas A & M University, College Station, TX 77843, United States; Alfred Wegener Institute, Bremerhaven, 27568, Germany; Center for Trace Analysis, Stennis Space Center, University of Southern MississippiMS 39529, United States; Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, Norfolk, VA 23529-0276, United States; Department of Earth System Science, Stanford University, Stanford, CA 94305, United States; Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, United States
推荐引用方式 GB/T 7714	Jenkins W.J.,Hatta M.,Fitzsimmons J.N.,et al. An intermediate-depth source of hydrothermal 3He and dissolved iron in the North Pacific[J],2020,539.
APA	Jenkins W.J..,Hatta M..,Fitzsimmons J.N..,Schlitzer R..,Lanning N.T..,...&Cahill K.L..(2020).An intermediate-depth source of hydrothermal 3He and dissolved iron in the North Pacific.Earth and Planetary Science Letters,539.
MLA	Jenkins W.J.,et al."An intermediate-depth source of hydrothermal 3He and dissolved iron in the North Pacific".Earth and Planetary Science Letters 539(2020).