Microbial sulfate reduction and organic sulfur formation in sinking marine particles

doi:10.1126/science.abc6035

GSTDTAP > 气候变化

DOI	10.1126/science.abc6035
	Microbial sulfate reduction and organic sulfur formation in sinking marine particles
	M. R. Raven; R. G. Keil; S. M. Webb
	2021-01-08
发表期刊	Science
出版年	2021
英文摘要	Climate warming is causing the expansion of marine oxygen-deficient zones, which are regions in which dissolved oxygen concentrations are so low that many marine animals cannot survive. This phenomenon also might affect the global cycles of carbon, sulfur, nitrogen, and trace metals in the oceans. Raven et al. show how ocean anoxia affects microbial sulfur processing in sinking marine particles. They observed cryptic microbial sulfate reduction, which forms organic sulfur that is resistant to acid hydrolysis, a process that could enhance carbon preservation in sediments underlying oxygen-deficient water columns. This may help explain some of the more extreme episodes of organic carbon preservation associated with marine anoxia in Earth's history. Science , this issue p. [178][1] Climate change is driving an expansion of marine oxygen-deficient zones, which may alter the global cycles of carbon, sulfur, nitrogen, and trace metals. Currently, however, we lack a full mechanistic understanding of how oxygen deficiency affects organic carbon cycling and burial. Here, we show that cryptic microbial sulfate reduction occurs in sinking particles from the eastern tropical North Pacific oxygen-deficient zone and that some microbially produced sulfide reacts rapidly to form organic sulfur that is resistant to acid hydrolysis. Particle-hosted sulfurization could enhance carbon preservation in sediments underlying oxygen-deficient water columns and serve as a stabilizing feedback between expanding anoxic zones and atmospheric carbon dioxide. A similar mechanism may help explain more-extreme instances of organic carbon preservation associated with marine anoxia in Earth history. [1]: /lookup/doi/10.1126/science.abc6035
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/310449
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	M. R. Raven,R. G. Keil,S. M. Webb. Microbial sulfate reduction and organic sulfur formation in sinking marine particles[J]. Science,2021.
APA	M. R. Raven,R. G. Keil,&S. M. Webb.(2021).Microbial sulfate reduction and organic sulfur formation in sinking marine particles.Science.
MLA	M. R. Raven,et al."Microbial sulfate reduction and organic sulfur formation in sinking marine particles".Science (2021).