Evidence for centennial-scale Mid-Holocene episodes of hypolimnetic anoxia in a high-altitude lake system from central Tian Shan (Kyrgyzstan)

Sorrel, Philippe; Jacq, Kévin; Exem, Antonin Van; Escarguel, Gilles; Diètre, Benjamin; Debret, Maxime; McGowan, Suzanne; Ducept, Jules; Gauthier, Émilie; Oberhänsli, Hedi

doi:10.1016/j.quascirev.2020.106748

Cited by 13 publications

(18 citation statements)

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“…Bacteriopheophytin a (a derivative of bacteriochlorophyll a and a biomarker for anoxygenic phototrophic purple sulfur bacteria [ 67 ]) absorbs light at approximately 845 nm [ 6 , 13 , 68 ], and the RABD 845 index has successfully been calibrated to concentrations of bacteriopheophytin a in several studies of lake sediments [ 6 , 43 , 49 , 50 , 51 , 53 ]. Additionally, an absorption band at 615 nm has been identified as phycocyanin (pigment produced by cyanobacteria [ 44 , 69 ]), and an absorption band at 510 nm has been interpreted as a proxy for carotenoid pigments [ 9 , 23 ]. However, these latter indices have not yet been validated with conventional analytical measurements.…”

Section: Biogeochemical Interpretation Of Sediment Reflectance Spectramentioning

confidence: 99%

“…HSI has been applied to lake sediments from across the globe, with the majority of sites being in Europe. The most common application has been the reconstruction of past aquatic productivity based on the absorbance of chloropigments [ 12 , 13 , 14 , 43 , 44 , 45 , 47 , 49 , 50 , 51 , 53 , 66 , 73 , 74 , 75 ]. Other sedimentary variables interpreted from HSI include bacteriopheophytin a [ 6 , 12 , 13 , 43 , 44 , 45 , 47 , 49 , 50 , 51 , 53 , 75 ], phycocyanin [ 44 ], bulk organic matter [ 11 , 55 ], aromatic organic matter [ 44 ], charcoal [ 12 , 62 ], tephra [ 54 ], flood layers [ 17 , 18 ], particle size [ 15 , 16 ], calcite [ 12 , 47 ], and lithogenic minerals [ 12 , 45 , 46 ].…”

Section: Applicationsmentioning

confidence: 99%

“…In a more arid environment, Lake Son Kol in Kyrgyzstan provides an example from a large, shallow lake. This lake featured a period of extensive anoxia from about 8500–5200 cal yr BP, driven by warmer temperatures and increased deposition of organic matter, which increased oxygen consumption rates [ 44 ].…”

Section: Applicationsmentioning

confidence: 99%

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Scanning Hyperspectral Imaging for In Situ Biogeochemical Analysis of Lake Sediment Cores: Review of Recent Developments

2022

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Hyperspectral imaging (HSI) in situ core scanning has emerged as a valuable and novel tool for rapid and non-destructive biogeochemical analysis of lake sediment cores. Variations in sediment composition can be assessed directly from fresh sediment surfaces at ultra-high-resolution (40–300 μm measurement resolution) based on spectral profiles of light reflected from sediments in visible, near infrared, and short-wave infrared wavelengths (400–2500 nm). Here, we review recent methodological developments in this new and growing field of research, as well as applications of this technique for paleoclimate and paleoenvironmental studies. Hyperspectral imaging of sediment cores has been demonstrated to effectively track variations in sedimentary pigments, organic matter, grain size, minerogenic components, and other sedimentary features. These biogeochemical variables record information about past climatic conditions, paleoproductivity, past hypolimnetic anoxia, aeolian input, volcanic eruptions, earthquake and flood frequencies, and other variables of environmental relevance. HSI has been applied to study seasonal and inter-annual environmental variability as recorded in individual varves (annually laminated sediments) or to study sedimentary records covering long glacial–interglacial time-scales (>10,000 years).

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Section: Biogeochemical Interpretation Of Sediment Reflectance Spectramentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

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Scanning Hyperspectral Imaging for In Situ Biogeochemical Analysis of Lake Sediment Cores: Review of Recent Developments

2022

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“…Four main types of hyperspectral cameras from different manufacturers are available on the hyperspectral core-logging market. The visible and near-infrared (VNIR) camera covers the range of 400-1000 nm, allowing the detection of photosynthetic pigments (chlorophylls) and bacterial pigments (bacteriochlorophylls) [52][53][54][55][56], iron oxides, and altered organic matter [57]. The short wave-infrared (SWIR) sensor, which acquires a spectrum between 1000-1700 nm or 1000-2500 nm, allows the study of organic compounds (aromatic, aliphatic) [58][59][60] and types of deposits (clays, carbonates) [61,62].…”

Section: What Is Hyperspectral Imaging? 21 Hyperspectral Sensorsmentioning

confidence: 99%

“…Currently, two spectral areas are widely used with the VNIR camera data. The first is specific to chlorophyll a (Chl a), pheophytin a (Phe a) and their derivatives, which can be identified by integrating the absorption area of these compounds in the range from 584 nm to 730 nm (Area584-730) or measuring their absorption peak height [52][53][54][55][56]. Chl a allows the reconstruction of aquatic productivity within the lake.…”

Section: Trophic Statusmentioning

confidence: 99%

Theoretical Principles and Perspectives of Hyperspectral Imaging Applied to Sediment Core Analysis

et al. 2022

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Hyperspectral imaging is a recent technology that has been gaining popularity in the geosciences since the 1990s, both in remote sensing and in the field or laboratory. Indeed, it allows the rapid acquisition of a large amount of data that are spatialized on the studied object with a low-cost, compact, and automatable sensor. This practical article aims to present the current state of knowledge on the use of hyperspectral imaging for sediment core analysis (core logging). To use the full potential of this type of sensor, many points must be considered and will be discussed to obtain reliable and quality data to extract many environmental properties of sediment cores. Hyperspectral imaging is used in many fields (e.g., remote sensing, geosciences and artificial intelligence) and offers many possibilities. The applications of the literature will be reviewed under five themes: lake and water body trophic status, source-to-sink approaches, organic matter and mineralogy studies, and sedimentary deposit characterization. Afterward, discussions will be focused on a multisensor core logger, data management, integrated use of these data for the selection of sample areas, and other opportunities. Through this practical article, we emphasize that hyperspectral imaging applied to sediment cores is still an emerging tool and shows many possibilities for refining the understanding of environmental processes.

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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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Evidence for centennial-scale Mid-Holocene episodes of hypolimnetic anoxia in a high-altitude lake system from central Tian Shan (Kyrgyzstan)

Cited by 13 publications

References 93 publications

Scanning Hyperspectral Imaging for In Situ Biogeochemical Analysis of Lake Sediment Cores: Review of Recent Developments

Scanning Hyperspectral Imaging for In Situ Biogeochemical Analysis of Lake Sediment Cores: Review of Recent Developments

Theoretical Principles and Perspectives of Hyperspectral Imaging Applied to Sediment Core Analysis

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

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