气候变化领域集成服务门户(CCPortal): The Distribution and Redox Speciation of Iodine in the Eastern Tropical North Pacific Ocean

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DOI	10.1029/2019GB006302
	The Distribution and Redox Speciation of Iodine in the Eastern Tropical North Pacific Ocean
	Moriyasu R.; Evans Z.C.; Bolster K.M.; Hardisty D.S.; Moffett J.W.
发表日期	2020
ISSN	0886-6236
EISSN	1944-9224
卷号	34 期号:2
英文摘要	The distributions of iodate (IO3 −), iodide (I−), nitrite (NO2 −), and oxygen (O2) were determined on two zonal transects and one meridional transect in the Eastern Tropical North Pacific (ETNP) in 2018. Iodine is a useful tracer of in situ redox transformations and inputs within the water column from continental margins. In oxygenated waters, iodine is predominantly present as oxidized iodate. In the oxygen deficient zone (ODZ) in the ETNP, a substantial fraction is reduced to iodide, with the highest iodide concentrations coincident with the secondary nitrite maxima. These features resemble ODZs in the Arabian Sea and Eastern Tropical South Pacific (ETSP). Maxima in iodide and nitrite were associated with a specific water mass, referred to as the 13 °C Water, the same water mass that contains the highest concentrations of iodide within the ETSP. Physical processes leading to patchiness in the 13 °C Water relative to other water masses could account for the patchiness frequently observed in iodide and nitrite, probably reflecting subsurface mesoscale features such as eddies. Throughout much of the ETNP ODZ, iodine concentrations were higher than the mean oceanic value. This “excess iodine” is attributed to lateral inputs from sedimentary margins. Excess iodine maxima are centered within a potential density of 26.2–26.6 kg/m3, a density range that intersects with reducing shelf sediments and is almost identical to the ETSP. Evidently, margin input processes are significant throughout the basin and can influence the nitrogen and iron cycles as well, as in the ETSP. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
scopus关键词	geochemical survey; iodine; redox conditions; sediment chemistry; speciation (biology); water mass; Pacific Ocean; Pacific Ocean (East); Pacific Ocean (Tropical)
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/129673
作者单位	Department of Biological Sciences, University of Southern California, Los Angeles, CA, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, United States
推荐引用方式 GB/T 7714	Moriyasu R.,Evans Z.C.,Bolster K.M.,et al. The Distribution and Redox Speciation of Iodine in the Eastern Tropical North Pacific Ocean[J],2020,34(2).
APA	Moriyasu R.,Evans Z.C.,Bolster K.M.,Hardisty D.S.,&Moffett J.W..(2020).The Distribution and Redox Speciation of Iodine in the Eastern Tropical North Pacific Ocean.Global Biogeochemical Cycles,34(2).
MLA	Moriyasu R.,et al."The Distribution and Redox Speciation of Iodine in the Eastern Tropical North Pacific Ocean".Global Biogeochemical Cycles 34.2(2020).