DOI: 10.1016/j.quascirev.2014.01.019
Scopus记录号: 2-s2.0-84896849803
论文题名: Using silicon isotopes to understand the role of the Southern Ocean in modern and ancient biogeochemistry and climate
作者: Hendry K.R. ; Brzezinski M.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 89 起始页码: 13
结束页码: 26
语种: 英语
英文关键词: Diatom
; Opal
; Silicic acid
; Silicon isotope
Scopus关键词: Diatom
; Geographical variations
; Nutrient contents
; Opal
; Silica production
; Silicic acids
; Silicon isotopes
; Temporal variability
; Carbon
; Forestry
; Isotopes
; Nutrients
; Phytoplankton
; Silica
; Silicon
; Surface waters
; Oceanography
; biogeochemistry
; carbon cycle
; concentration (composition)
; deep sea
; diatom
; growth rate
; nutrient cycling
; phytoplankton
; proxy climate record
; silica
; silicic acid
; silicon
; spatiotemporal analysis
; Southern Ocean
英文摘要: The growth of siliceous phytoplankton, mainly diatoms, in the Southern Ocean influences the preformed nutrient inventory in the ocean on a global scale. Silicic acid use by diatoms and deep circulation combine to trap dissolved Si in the Southern Ocean resulting in high levels of silica production and expansive diatom oozes in Southern Ocean sediments. The analysis of the silicon isotope composition of biogenic silica, or opal, and dissolved silicic acid provide insight into the operation of the global marine silicon cycle and the role played by the Southern Ocean in nutrient supply and carbon drawdown, both in the modern and in the past. Silicon isotope studies of diatoms have provided insight into the history of silica production in surface waters, while the analysis of spicules from deep sea sponges has defined both the spatial and the temporal variability of silicic acid concentrations in the water column; together these - and other - proxies reveal variations in the northward flow of Southern Ocean intermediate and mode waters and how changes in Southern Ocean productivity altered their preformed nutrient content. We present a new hypothesis - the "Silicic Acid Ventilation Hypothesis" (SAVH) - to explain the geographical variation of opal-based proxy records, in particular the contrasting patterns of opal burial change found in the low and high latitudes. By understanding the silicon isotope systematics of opal and silicic acid in the modern, we will be able to use opal-based proxies to reconstruct past changes in the Southern Ocean and so investigate its role in global carbon cycling and climate. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60346
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth and Ocean Sciences, Cardiff University, Park Place, Cardiff CF10 3AT, United Kingdom; School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, United Kingdom; Department of Ecology Evolution and Marine, Marine Sciences Institute, University of California, Santa Barbara, CA 93106-6150, United States; Marine Science Institute, University of California, Santa Barbara, CA 93106-6150, United States
Recommended Citation:
Hendry K.R.,Brzezinski M.A.. Using silicon isotopes to understand the role of the Southern Ocean in modern and ancient biogeochemistry and climate[J]. Quaternary Science Reviews,2014-01-01,89