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Constraining modern day silicon cycling in Lake Baikal

Panizzo, Virginia; Swann, George E.A.; Mackay, Anson W.; Vologina, Elena; Alleman, L.; Andre, L.; Pashley, Vanessa; Horstwood, Matthew S.A.

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Anson W. Mackay

Elena Vologina

L. Alleman

L. Andre

Vanessa Pashley

Matthew S.A. Horstwood


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 timescales. Silicon isotope data of dissolved silica (?30SiDSi) 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 c. 92% of annual river inflow to the lake suggest no seasonal alteration or anthropogenic impact on river ?30SiDSi composition. The absence of a change in ?30SiDSi within the Selenga Delta, through which 62% of riverine flow passes, suggest a net balance between biogenic uptake and dissolution in this system. A key feature of this study is the use of ?30SiDSi to examine seasonal and spatial variations in DSi utilisation and export across the lake. Using an open system model against deep water ?30SiDSi values from the lake, we estimate that 20-24% of DSi entering Lake Baikal is exported into the sediment record. Whilst highlighting the impact that lakes may have upon the sequestration of continental DSi, mixed layer ?30SiDSi values from 2003 and 2013 show significant spatial variability in the magnitude of spring bloom nutrient utilisation with lower rates in the north relative to south basin.

Journal Article Type Article
Acceptance Date Feb 23, 2017
Online Publication Date Mar 20, 2017
Deposit Date Mar 6, 2017
Publicly Available Date Mar 20, 2017
Journal Global Biogeochemical Cycles
Print ISSN 0886-6236
Electronic ISSN 1944-9224
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 31
Issue 3
Keywords Silicon isotopes; ?30SiDSi; Lake Baikal; Silicon export; Biogeochemical cycling; Diatoms
Public URL
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