气候变化领域集成服务门户(CCPortal): The Global Marine Selenium Cycle: Insights From Measurements and Modeling

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DOI	10.1029/2018GB006029
	The Global Marine Selenium Cycle: Insights From Measurements and Modeling
	Mason R.P.; Soerensen A.L.; DiMento B.P.; Balcom P.H.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1720
结束页码	1737
卷号	32 期号:12
英文摘要	Anthropogenic activities have increased the selenium (Se) concentration in the biosphere, but the overall impact on the ocean has not been examined. While Se is an essential nutrient for microorganisms, there is little information on the impact of biological processes on the concentration and speciation of Se in the ocean. Additionally, other factors controlling the distribution and concentration of Se species are poorly understood. Here we present data gathered in the subtropical Pacific Ocean during a cruise in 2011, and we used these field data and the literature, as well as laboratory photochemical experiments examining the stability and degradation of inorganic Se (both Se (IV) and Se (VI)) and dimethyl selenide, to further constrain the cycling of Se in the upper ocean. We also developed a multibox model for the biosphere to examine the impact of anthropogenic emissions on the concentration and distribution of Se in the ocean. The model concurs with the field data indicating that the Se concentration has increased in the upper ocean waters over the past 30 years. Our observational studies and model results suggest that Se (VI) is taken up by phytoplankton in the surface ocean, in contrast to the results of laboratory culture experiments. In conclusion, while anthropogenic inputs have markedly increased Se in the atmosphere (42%) and net deposition to the ocean (38%) and terrestrial landscape (41%), the impact on Se in the ocean is small (3% increase in the upper ocean). This minimal response reflects its long marine residence time. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	anthropogenic; box model; dimethyl selenide; Pacific Ocean; photochemistry; selenium
语种	英语
scopus关键词	anthropogenic effect; biosphere; concentration (composition); cruise report; degradation; human activity; inorganic compound; measurement method; microorganism; modeling; photochemistry; phytoplankton; selenium; speciation (chemistry); upper ocean; Pacific Ocean; Pacific Ocean (Subtropical)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129771
作者单位	Department of Marine Sciences, University of Connecticut, Groton, CT, United States; Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States
推荐引用方式 GB/T 7714	Mason R.P.,Soerensen A.L.,DiMento B.P.,et al. The Global Marine Selenium Cycle: Insights From Measurements and Modeling[J],2018,32(12).
APA	Mason R.P.,Soerensen A.L.,DiMento B.P.,&Balcom P.H..(2018).The Global Marine Selenium Cycle: Insights From Measurements and Modeling.Global Biogeochemical Cycles,32(12).
MLA	Mason R.P.,et al."The Global Marine Selenium Cycle: Insights From Measurements and Modeling".Global Biogeochemical Cycles 32.12(2018).