期刊
SCIENCE
卷 371, 期 6525, 页码 178-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abc6035
关键词
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资金
- NSF [1542240]
- Agouron Institute Geobiology Postdoctoral Fellowship
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- DOE Office of Biological and Environmental Research
- National Institutes of Health, National Institute of General Medical Sciences [P30GM133894]
- Division Of Environmental Biology
- Direct For Biological Sciences [1542240] Funding Source: National Science Foundation
Climate change is expanding marine oxygen-deficient zones, impacting global cycles and organic carbon storage. Research shows that microbial sulfate reduction may enhance organic carbon preservation in sediments, serving as a stabilizing feedback under anoxic conditions.
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.
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