Oxygen isotope composition of diatoms from Lake Emanda (northeastern Siberia, Russia)
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| Sprache: | en |
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PANGAEA
2021
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| author | Kostrova, Svetlana S Biskaborn, Boris K Pestryakova, Luidmila A Fernandoy, Francisco Lenz, Marlene M Meyer, Hanno |
| author_facet | Kostrova, Svetlana S Biskaborn, Boris K Pestryakova, Luidmila A Fernandoy, Francisco Lenz, Marlene M Meyer, Hanno |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The sedimentary sequence of core Co1412 from Lake Emanda (65°17′N; 135°45′E; 671 m a.s.l) has been retrieved in August 2017 using gravity and percussion piston corers (UWITEC Ltd., Austria) and investigated within the German-Russian 'Paleolimnological Transect' (PLOT) project. Well preserved diatoms occur only in the upper 125-cm interval of a 6.1-m sediment core covering the last 13.2 cal. ka BP. Diatoms were purified to >98% SiO₂ and <0.8% Al₂O₃ suitable for oxygen isotope analysis. The δ¹⁸O diatom values were corrected for contamination and range between +22.5‰ and +27.8‰. A new dataset on diatom oxygen isotope composition provides insights into the climate and environmental dynamics in an extreme continental setting in northeastern Siberia. The δ¹⁸O diatom record reveals an obvious shift of 2‰ in the δ¹⁸O diatom record at 11.7−11.5 cal. ka BP reflecting the onset of the Holocene. Relatively high δ¹⁸O diatom during the Early Holocene suggests relatively warm and/or dry climate with associated evaporation effects. The absolute maximum in δ¹⁸O diatom of +27.7‰ consistent with high values of diatom indices at 7.9−7.0 cal. ka BP suggests a Mid Holocene Thermal Maximum. A continuous depletion in δ¹⁸O diatom since ~5.0 cal. ka BP is interpreted as Middle to Late Holocene cooling reaching the absolute minimum at 0.4 cal. ka BP (i.e. the Little Ice Age). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_933228 |
| institution | PANGAEA |
| language | en |
| publishDate | 2021 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Oxygen isotope composition of diatoms from Lake Emanda (northeastern Siberia, Russia) Kostrova, Svetlana S Biskaborn, Boris K Pestryakova, Luidmila A Fernandoy, Francisco Lenz, Marlene M Meyer, Hanno AGE; Aluminium oxide in diatoms; AWI_Envi; Climate change; Co1412; Contamination; Core; DEPTH, sediment/rock; diatoms; Diatoms, δ18O; Diatoms, δ18O, corrected; eastern Siberia; Elemental analyzer (PDZ Europa); Lake Emanda; lake sediments; northeastern Siberia; Paleolimnological Transect; PLOT; Polar Terrestrial Environmental Systems @ AWI; SEDCO; Sediment corer; Silicon dioxide in diatoms; stabe isotopes The sedimentary sequence of core Co1412 from Lake Emanda (65°17′N; 135°45′E; 671 m a.s.l) has been retrieved in August 2017 using gravity and percussion piston corers (UWITEC Ltd., Austria) and investigated within the German-Russian 'Paleolimnological Transect' (PLOT) project. Well preserved diatoms occur only in the upper 125-cm interval of a 6.1-m sediment core covering the last 13.2 cal. ka BP. Diatoms were purified to >98% SiO₂ and <0.8% Al₂O₃ suitable for oxygen isotope analysis. The δ¹⁸O diatom values were corrected for contamination and range between +22.5‰ and +27.8‰. A new dataset on diatom oxygen isotope composition provides insights into the climate and environmental dynamics in an extreme continental setting in northeastern Siberia. The δ¹⁸O diatom record reveals an obvious shift of 2‰ in the δ¹⁸O diatom record at 11.7−11.5 cal. ka BP reflecting the onset of the Holocene. Relatively high δ¹⁸O diatom during the Early Holocene suggests relatively warm and/or dry climate with associated evaporation effects. The absolute maximum in δ¹⁸O diatom of +27.7‰ consistent with high values of diatom indices at 7.9−7.0 cal. ka BP suggests a Mid Holocene Thermal Maximum. A continuous depletion in δ¹⁸O diatom since ~5.0 cal. ka BP is interpreted as Middle to Late Holocene cooling reaching the absolute minimum at 0.4 cal. ka BP (i.e. the Little Ice Age). |
| title | Oxygen isotope composition of diatoms from Lake Emanda (northeastern Siberia, Russia) |
| topic | AGE; Aluminium oxide in diatoms; AWI_Envi; Climate change; Co1412; Contamination; Core; DEPTH, sediment/rock; diatoms; Diatoms, δ18O; Diatoms, δ18O, corrected; eastern Siberia; Elemental analyzer (PDZ Europa); Lake Emanda; lake sediments; northeastern Siberia; Paleolimnological Transect; PLOT; Polar Terrestrial Environmental Systems @ AWI; SEDCO; Sediment corer; Silicon dioxide in diatoms; stabe isotopes |
| url | https://doi.org/10.1594/PANGAEA.933228 |