DOI: 10.1002/2014GB004967
Scopus记录号: 2-s2.0-85027941705
论文题名: Controls on the silicon isotope distribution in the ocean: New diagnostics from a data-constrained model
作者: Holzer M ; , Brzezinski M ; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 3 起始页码: 267
结束页码: 287
语种: 英语
英文关键词: global ocean silicon cycle
; preformed and regenerated nutrients
; silicic acid
; silicon isotopes
Scopus关键词: data assimilation
; euphotic zone
; global ocean
; isotopic fractionation
; isotopic ratio
; silicic acid
; silicon
; spatial distribution
; Atlantic Ocean
; Atlantic Ocean (North)
; Indian Ocean
; Pacific Ocean
; Southern Ocean
英文摘要: The global distributions of the silicon isotopes within silicic acid are estimated by adding isotope fractionation to an optimized, data-constrained model of the oceanic silicon cycle that is embedded in a data-assimilated steady circulation. Including fractionation during opal dissolution improves the model's ability to capture the approximately linear relation between isotope ratio, δ30Si, and inverse silicic acid concentration observed in the deep Atlantic. To quantify the importance of hydrographic control on the isotope distribution, δ30Si is partitioned into contributions from preformed and regenerated silicic acid, further partitioned according to euphotic zone origin. We find that the large-scale features of the isotope distribution in the Atlantic basin are dominated by preformed silicic acid, with regenerated silicic acid being important for setting vertical gradients. In the Pacific and Indian Oceans, preformed and regenerated silicic acid make roughly equally important contributions to the pattern of the isotope ratio, with gradients of the preformed and regenerated contributions tending to cancel each other in the deep Pacific. The Southern Ocean euphotic zone is the primary origin of both the preformed and regenerated contributions to δ30Si. Nearly the entire preformed part of δ30Si is of Southern Ocean and North Atlantic origin. The regenerated part of δ30Si in the Atlantic basin also has a contribution of Central Atlantic (∼40 °S-40°N) origin that is comparable in magnitude to the North Atlantic contribution. In other basins, the Central Pacific and Indian Ocean are the second largest contributors to the regenerated part of δ30Si. ©2015. 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/77996
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Applied Mathematics, School of Mathematics and Statistics, University of New South Wales, Sydney, NSW, Australia; Also at Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States; Department of Ecology, Evolution and Marine Biology, Marine Science Institute, University of California, Santa Barbara, CA, United States
Recommended Citation:
Holzer M,, Brzezinski M,A. Controls on the silicon isotope distribution in the ocean: New diagnostics from a data-constrained model[J]. Global Biogeochemical Cycles,2015-01-01,29(3)