DOI: 10.1038/s41561-018-0081-0
论文题名: Global niche of marine anaerobic metabolisms expanded by particle microenvironments
作者: Bianchi D. ; Weber T.S. ; Kiko R. ; Deutsch C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 4 起始页码: 263
结束页码: 268
语种: 英语
英文摘要: In ocean waters, anaerobic microbial respiration should be confined to the anoxic waters found in coastal regions and tropical oxygen minimum zones, where it is energetically favourable. However, recent molecular and geochemical evidence has pointed to a much broader distribution of denitrifying and sulfate-reducing microbes. Anaerobic metabolisms are thought to thrive in microenvironments that develop inside sinking organic aggregates, but the global distribution and geochemical significance of these microenvironments is poorly understood. Here, we develop a new size-resolved particle model to predict anaerobic respiration from aggregate properties and seawater chemistry. Constrained by observations of the size spectrum of sinking particles, the model predicts that denitrification and sulfate reduction can be sustained throughout vast, hypoxic expanses of the ocean, and could explain the trace metal enrichment observed in particles due to sulfide precipitation. Globally, the expansion of the anaerobic niche due to particle microenvironments doubles the rate of water column denitrification compared with estimates based on anoxic zones alone, and changes the sensitivity of the marine nitrogen cycle to deoxygenation in a warming climate. © 2018 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105585
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Atmospheric and Oceanic Sciences, University of California Los Angeles, Los Angeles, CA, United States; Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY, United States; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; School of Oceanography, University of Washington, Seattle, WA, United States
Recommended Citation:
Bianchi D.,Weber T.S.,Kiko R.,et al. Global niche of marine anaerobic metabolisms expanded by particle microenvironments[J]. Nature Geoscience,2018-01-01,11(4)