DOI: 10.1029/2019GB006302
论文题名: The Distribution and Redox Speciation of Iodine in the Eastern Tropical North Pacific Ocean
作者: Moriyasu R. ; Evans Z.C. ; Bolster K.M. ; Hardisty D.S. ; Moffett J.W.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2020
卷: 34, 期: 2 语种: 英语
英文关键词: geochemical survey
; iodine
; redox conditions
; sediment chemistry
; speciation (biology)
; water mass
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (Tropical)
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160068
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Global Biogeochemical Cycles,2020-01-01,34(2)