Constraining modern‐day silicon cycling in Lake Baikal. Issue 3 (20th March 2017)

• Record Type: Journal Article
• Authors: Panizzo, V. N.; Swann, G. E. A.; Mackay, A. W.; Vologina, E.; Alleman, L.; André, L.; Pashley, V. H.; Horstwood, M. S. A.
• Is Part Of: Global biogeochemical cycles. Volume 31:Issue 3(2017:Mar.)
• Page Start: 556
• Page End: 574
• Publication Date: 2017-03-20
• Subjects: silicon isotopes -- δ30SiDSi -- Lake Baikal -- silicon export -- biogeochemical cycling -- diatoms; Biogeochemical cycles -- Periodicals; Electronic journals; 577.1405
• DOI: 10.1002/2016GB005518
• Languages: English
• ISSNs: 0886-6236

Abstract

Abstract: 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 (δ 30 SiDSi ) 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 δ 30 SiDSi composition. The absence of a change in δ 30 SiDSi 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 δ 30 SiDSi to examine seasonal and spatial variations in DSi utilization and export across the lake. Using an open system model against deepwater δ 30 SiDSi 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 δ 30 SiDSi 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. Key Points: There is no seasonal alteration or anthropogenic impact on Lake Baikal river catchment δ 30 SiDSi compositions We estimate that up to 20‐24% of DSi entering Lake Baikal is exported into the sediment record (via diatom biogeochemical cycling) South and central basin DSi utilization and export are greater than estimations for the north basin