Indicators of Oxic and Anoxic Conditions in the System of the Current Sedimentation of Saline Lake Shira (Khakassia), According to High-Resolution SR XRF Data on Bottom Sediments Frozen In Situ

Калугин, И. А.; Дарин, А. В.; Бабич, В. В.; Маркович, Т. И.; Rakshun, Ya. V.; Darin, F. A.; Сороколетов, Д. С.; Rogozin, D. Yu.

doi:10.3103/s1062873819020163

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…A 10 ml sample of free water was also dried, and the solid residue was weighed. The elemental composition was measured in solid blocks of sediment material and residue of water using micro-XRF analysis by Synchrotron radiation (scan XRF SR) in the Institute of Nuclear Physics (Novosibirsk, Russia) (Kalugin et al, 2019). The elemental composition of the sedimentary material was corrected taking into account the elemental composition of the dry residue of the lake water.…”

Section: Elemental Compositionmentioning

confidence: 99%

Seasonal and inter-annual sedimentation in meromictic Lake Shira (Siberia, Russia) during disturbance of meromixis

Rogozin

Dar’in²,

Zykov³

et al. 2023

J Paleolimnol

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Detailed studies of processes of sediment record formation are necessary for accurate sediment-derived paleo-environmental reconstructions. In order to understand the formation of sediments in meromictic Lake Shira (southern Siberia, Russia), we conducted the multi-year seasonal sediment trap study of sediment uxes of chemical elements, organic and inorganic carbon, total nitrogen, and photosynthetic pigments for a period from 2012 to . In parallel, in 2013, we estimated the contents of photosynthetic pigments in uppermost sediment layers frozen in situ with a freeze-corer. In 2015 and 2016, a rare event of transition from meromixis (i.e. long-term hypolimnetic anoxia) to holomixis was observed, which was accompanied by the temporary disappearance of hydrogen sul de from the water column in spring and a decrease in hydrogen sul de in other seasons compared to the meromictic state. Using the freeze-corer, we observed that sediment structure changed from laminated to homogeneous after holomixis. The content of algal photosynthetic pigments slightly increased in uppermost sediments in 2017 and 2018, which was probably caused by an increase in lake primary production resulting from the release of nutrients during the mixing events in 2015 and 2016. The content of okenone, a speci c carotenoid of purple sulfur bacteria, decreased during the holomictic state both in traps and in uppermost sediments and did not considerably increase two years after the meromixis restoration. The sedimentation ux of molybdenum re ected the seasonality of hydrogen sul de content in the water column, and it was maximal in winter, in contrast to all other sediment components. Other components re ected the seasonality of organic production and terrigenous inputs, with the maximum in late summer and autumn. An increase in the sedimentation rate of terrigenous elements in the autumn of 2012 was supposedly caused by the anomalous amount of atmospheric precipitation in August 2012. Since detailed inter-annual observations of sedimentation processes are not often found in limnology, we hope that our results will be useful for reconstructing regional climate and, further, for understanding the dynamics of strati ed temperate water bodies.

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Section: Elemental Compositionmentioning

confidence: 99%

Seasonal and inter-annual sedimentation in meromictic Lake Shira (Siberia, Russia) during disturbance of meromixis

Rogozin

Dar’in²,

Zykov³

et al. 2023

J Paleolimnol

Self Cite

View full text Add to dashboard Cite

show abstract

Seasonal and inter-annual sedimentation in meromictic Lake Shira (Siberia, Russia) during disturbance of meromixis

Rogozin

Дарин

Zykov

et al. 2022

Preprint

View full text Add to dashboard Cite

Detailed studies of processes of sediment record formation are necessary for accurate sediment-derived paleo-environmental reconstructions. In order to understand the formation of sediments in meromictic Lake Shira (southern Siberia, Russia), we conducted the multi-year seasonal sediment trap study of sediment fluxes of chemical elements, organic and inorganic carbon, total nitrogen, and photosynthetic pigments for a period from 2012 to 2017. In parallel, in 2013, 2016, 2017, and 2018, we estimated the contents of photosynthetic pigments in uppermost sediment layers frozen in situ with a freeze-corer. In 2015 and 2016, a rare event of transition from meromixis (i.e. long-term hypolimnetic anoxia) to holomixis was observed, which was accompanied by the temporary disappearance of hydrogen sulfide from the water column in spring and a decrease in hydrogen sulfide in other seasons compared to the meromictic state. Using the freeze-corer, we observed that sediment structure changed from laminated to homogeneous after holomixis. The content of algal photosynthetic pigments slightly increased in uppermost sediments in 2017 and 2018, which was probably caused by an increase in lake primary production resulting from the release of nutrients during the mixing events in 2015 and 2016. The content of okenone, a specific carotenoid of purple sulfur bacteria, decreased during the holomictic state both in traps and in uppermost sediments and did not considerably increase two years after the meromixis restoration. The sedimentation flux of molybdenum reflected the seasonality of hydrogen sulfide content in the water column, and it was maximal in winter, in contrast to all other sediment components. Other components reflected the seasonality of organic production and terrigenous inputs, with the maximum in late summer and autumn. An increase in the sedimentation rate of terrigenous elements in the autumn of 2012 was supposedly caused by the anomalous amount of atmospheric precipitation in August 2012. Since detailed inter-annual observations of sedimentation processes are not often found in limnology, we hope that our results will be useful for reconstructing regional climate and, further, for understanding the dynamics of stratified temperate water bodies.

show abstract

Indicators of Oxic and Anoxic Conditions in the System of the Current Sedimentation of Saline Lake Shira (Khakassia), According to High-Resolution SR XRF Data on Bottom Sediments Frozen In Situ

Cited by 2 publications

References 11 publications

Seasonal and inter-annual sedimentation in meromictic Lake Shira (Siberia, Russia) during disturbance of meromixis

Seasonal and inter-annual sedimentation in meromictic Lake Shira (Siberia, Russia) during disturbance of meromixis

Seasonal and inter-annual sedimentation in meromictic Lake Shira (Siberia, Russia) during disturbance of meromixis

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