globalchange  > 气候变化事实与影响
DOI: 10.1002/2016GB005518
Scopus记录号: 2-s2.0-85017350645
论文题名:
Constraining modern-day silicon cycling in Lake Baikal
作者: Panizzo V; N; , Swann G; E; A; , Mackay A; W; , Vologina E; , Alleman L; , André L; , Pashley V; H; , Horstwood M; S; A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期:3
起始页码: 556
结束页码: 574
语种: 英语
英文关键词: biogeochemical cycling ; diatoms ; Lake Baikal ; silicon export ; silicon isotopes ; δ30SiDSi
Scopus关键词: biogeochemical cycle ; biological uptake ; catchment ; chemical composition ; diatom ; drainage basin ; flux measurement ; inflow ; isotope ; nutrient dynamics ; silica ; silicon ; transport process ; Arctic Ocean ; Buryatia ; Lake Baikal ; Russian Federation ; Selenga Delta ; Siberia ; Bacillariophyta
英文摘要: Constraining the continental silicon cycle is a key requirement in attempts to understand both nutrient fluxes to the ocean and linkages between silicon and carbon cycling over different time scales. Silicon isotope data of dissolved silica (δ30SiDSi) are presented here from Lake Baikal and its catchment in central Siberia. As well as being the world's oldest and voluminous lake, Lake Baikal lies within the seventh largest drainage basin in the world and exports significant amounts of freshwater into the Arctic Ocean. Data from river waters accounting for ~92% of annual river inflow to the lake suggest no seasonal alteration or anthropogenic impact on river δ30SiDSi composition. The absence of a change in δ30SiDSi within the Selenga Delta, through which 62% of riverine flow passes, suggests a net balance between biogenic uptake and dissolution in this system. A key feature of this study is the use of δ30SiDSi to examine seasonal and spatial variations in DSi utilization and export across the lake. Using an open system model against deepwater δ30SiDSi values from the lake, we estimate that 20–24% of DSi entering Lake Baikal is exported into the sediment record. While highlighting the impact that lakes may have upon the sequestration of continental DSi, mixed layer δ30SiDSi values from 2003 and 2013 show significant spatial variability in the magnitude of spring bloom nutrient utilization with lower rates in the north relative to south basin. ©2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77758
Appears in Collections:气候变化事实与影响

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作者单位: School of Geography, University of Nottingham, University Park, Nottingham, United Kingdom; Centre for Environmental Geochemistry, University of Nottingham, University Park, Nottingham, United Kingdom; Environmental Change Research Centre, Department of Geography, University College London, London, United Kingdom; Institute of Earth's Crust, Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russian Federation; SAGE-Département Sciences de l'Atmosphère et Génie de l'Environnement, IMT Lille Douai, University of Lille, Lille, France; Earth Sciences Department, Royal Museum for Central Africa, Tervuren, Belgium; NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham, United Kingdom

Recommended Citation:
Panizzo V,N,, Swann G,et al. Constraining modern-day silicon cycling in Lake Baikal[J]. Global Biogeochemical Cycles,2017-01-01,31(3)
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