Quantifying the impact of freshwater diatom productivity on silicon isotopes and silicon fluxes: Lake Myvatn, Iceland

Opfergelt, Sophie; Eiríksdóttir, Eydís Salome; Burton, Kevin W.; Einarsson, Árni; Siebert, Christopher; Gíslason, Sigurður R.; Halliday, Alex N.

doi:10.1016/j.epsl.2011.02.043

Cited by 51 publications

(70 citation statements)

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“…However, in instances where dissolution is significant, for example in response to elevated pH or salinity, the impacts are clearly observed with elevated DSi concentrations and lower δ 30 Si (Opfergelt et al, 2011). Importantly, the contemporary studies carried out to date all highlight the potential for δ 30 Si to be used to study temporal changes in Si cycling, for example through the use of sediment cores.…”

Section: Lakesmentioning

confidence: 99%

“…Whilst riverine inputs cause initial lake profiles to be primarily a function of upstream catchment processes (weathering of rock and productivity inputs), subsequent inlake DSi biomineralization can significantly modify DSi/δ 30 Si DSi before waters continue through the outflow and eventually into the marine system Opfergelt et al, 2011). As with the oceans, siliceous productivity in lakes is primarily a function of light and nutrient availability.…”

Section: Lakesmentioning

confidence: 99%

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A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

et al. 2018

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Section: Lakesmentioning

confidence: 99%

Section: Lakesmentioning

confidence: 99%

A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

et al. 2018

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“…A value of 30 e at -1.1 % was determined in vitro (De La Rocha et al 1997) and in situ (Fripiat et al 2011) for marine diatoms, and validated in lakes Opfergelt et al 2011).…”

Section: Stable Isotope Samplesmentioning

confidence: 99%

“…Stable Si isotopes analyses were made at Université catholique de Louvain in Belgium according to the method from Opfergelt et al (2011). Briefly, soil and litter samples were ashed to remove organic matter.…”

Section: Stable Isotope Samplesmentioning

confidence: 99%

High concentrations of amorphous, biogenic Si (BSi) in the sediment of a small high-latitude lake: implications for biogeochemical Si cycling and for the use of BSi as a paleoproxy

et al. 2014

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The concentration of biogenic silica (BSi) in soils and sediments may be studied for several purposes, most notably either as a paleo-environmental proxy or to clarify the transport of weathering-derived Si within the biogeosphere. With this in mind, we explored the reasons behind the very high BSi concentration (average 250 mg Si g -1 dry mass) in the sediment of a small, highlatitude lake in Finnish Lapland, Lake Kuutsjärvi, using bulk BSi and stable Si isotope analysis of major Si pools in the lake and its drainage area. The high BSi content of the sediment was relatively stable over the past few hundred years and recent changes in the food web of the lake were not clearly reflected in the data. The origin of the sedimentary BSi was not solely autochthonous diatom production: extraneous sources accounted for possibly as much as 54-88 % (isotope analysis). A main reason for the high BSi content appeared to be the transport of older deposits of diatom material from the drainage area into the current lake basin, although other factors such as good preservation conditions may have contributed. Although our results indicate that small high-latitude lakes may be hot-spots in the burial of BSi, more information is needed on the processes that affect the translocation of BSi from the drainage area to the aquatic system. Caution is advisable when past lake conditions are inferred from sedimentary BSi only.

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“…δ 30 Si BSi is the values shown in Fig. 4 and the δ 30 Si river input value is taken to be +1.1 ‰ which is derived from measurements of an unregulated boreal river, the Kalix River (Opfergelt et al, 2011). This represents unperturbed river inflow.…”

Section: Quantitatively Reconstructing Diatom Productionmentioning

confidence: 99%

Climate dependent diatom production is preserved in biogenic Si isotope signatures

et al. 2011

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Abstract. The aim of this study was to reconstruct diatom production in the subarctic northern tip of the Baltic Sea, Bothnian Bay, based on down-core analysis of Si isotopes in biogenic silica (BSi). Dating of the sediment showed that the samples covered the period 1820 to 2000. The sediment core record can be divided into two periods, an unperturbed period from 1820 to 1950 and a second period affected by human activities (from 1950 to 2000). This has been observed elsewhere in the Baltic Sea. The shift in the sediment core record after 1950 is likely caused by large scale damming of rivers. Diatom production was inferred from the Si isotope composition which ranged between δ 30 Si −0.18 ‰ and +0.58 ‰ in BSi, and assuming fractionation patterns due to the Raleigh distillation, the production was shown to be correlated with air and water temperature, which in turn were correlated with the mixed layer(ML) depth. The sedimentary record showed that the deeper ML depth observed in colder years resulted in less production of diatoms. Pelagic investigations in the 1990's have clearly shown that diatom production in the Baltic Sea is controlled by the ML depth. Especially after cold winters and deep water mixing, diatom production was limited and dissolved silicate (DSi) concentrations were not depleted in the water column after the spring bloom. Our method corroborates these findings and offers a new method to estimate diatom production over much longer periods of time in diatom dominated aquatic systems, i.e. a large part of the world's ocean and coastal seas.

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Quantifying the impact of freshwater diatom productivity on silicon isotopes and silicon fluxes: Lake Myvatn, Iceland

Cited by 51 publications

References 50 publications

A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

A Review of the Stable Isotope Bio-geochemistry of the Global Silicon Cycle and Its Associated Trace Elements

High concentrations of amorphous, biogenic Si (BSi) in the sediment of a small high-latitude lake: implications for biogeochemical Si cycling and for the use of BSi as a paleoproxy

Climate dependent diatom production is preserved in biogenic Si isotope signatures

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