气候变化领域集成服务门户(CCPortal): Trivalent chromium isotopes in the eastern tropical North Pacific oxygen-deficient zone

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DOI	10.1073/pnas.1918605118
	Trivalent chromium isotopes in the eastern tropical North Pacific oxygen-deficient zone
	Huang T.; Moos S.B.; Boyle E.A.
发表日期	2021
ISSN	00278424
卷号	118 期号:8
英文摘要	Changes in chromium (Cr) isotope ratios due to fractionation between trivalent [Cr(III)] and hexavalent [Cr(VI)] are being utilized by geologists to infer oxygen conditions in past environments. However, there is little information available on Cr in the modern ocean to ground-truth these inferences. Transformations between the two chromium species are important processes in oceanic Cr cycling. Here we present profiles of hexavalent and trivalent Cr concentrations and stable isotope ratios from the eastern tropical North Pacific (ETNP) oxygen-deficient zone (ODZ) which support theoretical and experimental studies that predict that lighter Cr is preferentially reduced in low-oxygen environments and that residual dissolved Cr becomes heavier due to removal of particle-reactive Cr(III) on sinking particles. The Cr(III) maximum dominantly occurs in the upper portion of the ODZ, implying that microbial activity (dependent on the sinking flux of organic matter) may be the dominant mechanism for this transformation, rather than a simple inorganic chemical conversion between the species depending on the redox potential. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Chromium isotopes; Hexavalent chromium; Oxygen-deficient zones; Trace elements; Trivalent chromium
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180592
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Massachusetts Institute of Technology/Woods Hole Oceanographic Institution, Joint Program in Oceanography, Cambridge, MA 02139, United States
推荐引用方式 GB/T 7714	Huang T.,Moos S.B.,Boyle E.A.. Trivalent chromium isotopes in the eastern tropical North Pacific oxygen-deficient zone[J],2021,118(8).
APA	Huang T.,Moos S.B.,&Boyle E.A..(2021).Trivalent chromium isotopes in the eastern tropical North Pacific oxygen-deficient zone.Proceedings of the National Academy of Sciences of the United States of America,118(8).
MLA	Huang T.,et al."Trivalent chromium isotopes in the eastern tropical North Pacific oxygen-deficient zone".Proceedings of the National Academy of Sciences of the United States of America 118.8(2021).