DOI: 10.1029/2018GB006029
论文题名: The Global Marine Selenium Cycle: Insights From Measurements and Modeling
作者: Mason R.P. ; Soerensen A.L. ; DiMento B.P. ; Balcom P.H.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 12 语种: 英语
英文关键词: 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)
学科: anthropogenic
; box model
; dimethyl selenide
; Pacific Ocean
; photochemistry
; selenium
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160175
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Mason R.P.,Soerensen A.L.,DiMento B.P.,et al. The Global Marine Selenium Cycle: Insights From Measurements and Modeling[J]. Global Biogeochemical Cycles,2018-01-01,32(12)