气候变化领域集成服务门户(CCPortal): Spatial Heterogeneity in Particle-Associated, Light-Independent Superoxide Production Within Productive Coastal Waters

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DOI	10.1029/2020JC016747
	Spatial Heterogeneity in Particle-Associated, Light-Independent Superoxide Production Within Productive Coastal Waters
	Sutherland K.M.; Grabb K.C.; Karolewski J.S.; Plummer S.; Farfan G.A.; Wankel S.D.; Diaz J.M.; Lamborg C.H.; Hansel C.M.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	In the marine environment, the reactive oxygen species (ROS) superoxide is produced through a diverse array of light-dependent and light-independent reactions, the latter of which is thought to be primarily controlled by microorganisms. Marine superoxide production influences organic matter remineralization, metal redox cycling, and dissolved oxygen concentrations, yet the relative contributions of different sources to total superoxide production remain poorly constrained. Here we investigate the production, steady-state concentration, and particle-associated nature of light-independent superoxide in productive waters off the northeast coast of North America. We find exceptionally high levels of light-independent superoxide in the marine water column, with concentrations ranging from 10 pM to in excess of 2,000 pM. The highest superoxide concentrations were particle associated in surface seawater and in aphotic seawater collected meters off the seafloor. Filtration of seawater overlying the continental shelf lowered the light-independent, steady-state superoxide concentration by an average of 84%. We identify eukaryotic phytoplankton as the dominant particle-associated source of superoxide to these coastal waters. We contrast these measurements with those collected at an off-shelf station, where superoxide concentrations did not exceed 100 pM, and particles account for an average of 40% of the steady-state superoxide concentration. This study demonstrates the primary role of particles in the production of superoxide in seawater overlying the continental shelf and highlights the importance of light-independent, dissolved-phase reactions in marine ROS production. ©2020. The Authors.
英文关键词	extracellular superoxide; light-independent ROS; reactive oxygen species
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186614
作者单位	Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, Cambridge, MA, United States; Now at Department of Earth and Planetary Science, Harvard University, Cambridge, MA, United States; Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA, United States; Now at Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Department of Mineral Sciences, Smithsonian Institution, Washington, DC, United States; Ocean Sciences Department, University of California, Santa Cruz, CA, United States
推荐引用方式 GB/T 7714	Sutherland K.M.,Grabb K.C.,Karolewski J.S.,et al. Spatial Heterogeneity in Particle-Associated, Light-Independent Superoxide Production Within Productive Coastal Waters[J],2020,125(10).
APA	Sutherland K.M..,Grabb K.C..,Karolewski J.S..,Plummer S..,Farfan G.A..,...&Hansel C.M..(2020).Spatial Heterogeneity in Particle-Associated, Light-Independent Superoxide Production Within Productive Coastal Waters.Journal of Geophysical Research: Oceans,125(10).
MLA	Sutherland K.M.,et al."Spatial Heterogeneity in Particle-Associated, Light-Independent Superoxide Production Within Productive Coastal Waters".Journal of Geophysical Research: Oceans 125.10(2020).