气候变化领域集成服务门户(CCPortal): Insights Into the Biogeochemical Cycling of Iron, Nitrate, and Phosphate Across a 5,300 km South Pacific Zonal Section (153°E

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DOI	10.1002/2017GB005736
	Insights Into the Biogeochemical Cycling of Iron, Nitrate, and Phosphate Across a 5,300 km South Pacific Zonal Section (153°E–150°W)
	Ellwood M.J.; Bowie A.R.; Baker A.; Gault-Ringold M.; Hassler C.; Law C.S.; Maher W.A.; Marriner A.; Nodder S.; Sander S.; Stevens C.; Townsend A.; van der Merwe P.; Woodward E.M.S.; Wuttig K.; Boyd P.W.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	187
结束页码	207
卷号	32 期号:2
英文摘要	Iron, phosphate, and nitrate are essential nutrients for phytoplankton growth, and hence, their supply into the surface ocean controls oceanic primary production. Here we present a GEOTRACES zonal section (GP13; 30–33°S, 153°E–150°W) extending eastward from Australia to the oligotrophic South Pacific Ocean gyre outlining the concentrations of these key nutrients. Surface dissolved iron concentrations are elevated at >0.4 nmol L−1 near continental Australia (west of 165°E) and decreased eastward to ≤0.2 nmol L−1 (170°W–150°W). The supply of dissolved iron into the upper ocean (<100 m) from the atmosphere and vertical diffusivity averaged 11 ± 10 nmol m−2 d−1. In the remote South Pacific Ocean (170°W–150°W), atmospherically sourced iron is a significant contributor to the surface dissolved iron pool with average supply contribution of 23 ± 17% (range 3% to 55%). Surface water nitrate concentrations averaged 5 ± 4 nmol L−1 between 170°W and 150°W, while surface water phosphate concentrations averaged 58 ± 30 nmol L−1. The supply of nitrogen into the upper ocean is primarily from deeper waters (24–1647 μmol m−2 d−1) with atmospheric deposition and nitrogen fixation contributing <1% to the overall flux along the eastern part of the transect. The deep water N:P ratio averaged 14.5 ± 0.5 but declined to <1 above the deep chlorophyll maximum (DCM) indicating a high N:P assimilation ratio by phytoplankton leading to almost quantitative removal of nitrate. The supply stoichiometry for iron and nitrogen relative to phosphate at and above the DCM declines eastward leading to two biogeographical provinces: one with diazotroph production and the other without diazotroph production. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	iron; nitrate; phosphate; phytoplankton; SW Pacific Ocean
语种	英语
scopus关键词	atmospheric deposition; biogeochemical cycle; biogeographical region; chlorophyll; deep water; diffusivity; gyre; nitrate; nitrogen fixation; phosphate; phytoplankton; surface water; upper ocean; Australia; Pacific Ocean; Pacific Ocean (Southwest)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129863
作者单位	Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, TAS, Australia; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Department of Chemistry, University of Otago, Dunedin, New Zealand; Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Geneva, Switzerland; National Institute of Water and Atmospheric Research, Wellington, New Zealand; Institute for Applied Ecology, University of Canberra, Canberra, ACT, Australia; Department of Physics, University of Auckland, Auckland, New Zealand; Central Science Laboratory, University of Tasmania, Hobart, TAS, Australia; Plymouth Marine Laboratory, Plymouth, United Kingdom; Now at Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS...
推荐引用方式 GB/T 7714	Ellwood M.J.,Bowie A.R.,Baker A.,等. Insights Into the Biogeochemical Cycling of Iron, Nitrate, and Phosphate Across a 5,300 km South Pacific Zonal Section (153°E–150°W)[J],2018,32(2).
APA	Ellwood M.J..,Bowie A.R..,Baker A..,Gault-Ringold M..,Hassler C..,...&Boyd P.W..(2018).Insights Into the Biogeochemical Cycling of Iron, Nitrate, and Phosphate Across a 5,300 km South Pacific Zonal Section (153°E–150°W).Global Biogeochemical Cycles,32(2).
MLA	Ellwood M.J.,et al."Insights Into the Biogeochemical Cycling of Iron, Nitrate, and Phosphate Across a 5,300 km South Pacific Zonal Section (153°E–150°W)".Global Biogeochemical Cycles 32.2(2018).