Climate and environmental changes of the Lategacial transition and Holocene in northeastern Siberia: Evidence from diatom oxygen isotopes and assemblage composition at Lake Emanda

A new dataset from Lake Emanda provides insights into climate and environmental dynamics in an extreme continental setting in northeastern Siberia. The δ18Odiatom record is supported by diatom assemblage analysis, modern isotope hydrology and atmospheric circulation patterns. The data reveal a relat...

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Bibliographic Details
Main Authors: Biskaborn, B.K (Author), Fernandoy, F. (Author), Kostrova, S.S (Author), Lenz, M.M (Author), Meyer, H. (Author), Pestryakova, L.A (Author)
Format: Article
Language:English
Published: Elsevier Ltd 2021
Subjects:
Online Access:View Fulltext in Publisher
LEADER 03508nam a2200565Ia 4500
001 10.1016-j.quascirev.2021.106905
008 220427s2021 CNT 000 0 und d
020 |a 02773791 (ISSN) 
245 1 0 |a Climate and environmental changes of the Lategacial transition and Holocene in northeastern Siberia: Evidence from diatom oxygen isotopes and assemblage composition at Lake Emanda 
260 0 |b Elsevier Ltd  |c 2021 
856 |z View Fulltext in Publisher  |u https://doi.org/10.1016/j.quascirev.2021.106905 
520 3 |a A new dataset from Lake Emanda provides insights into climate and environmental dynamics in an extreme continental setting in northeastern Siberia. The δ18Odiatom record is supported by diatom assemblage analysis, modern isotope hydrology and atmospheric circulation patterns. The data reveal a relatively cold oligotrophic freshwater lake system persisting for the last ∼13.2 cal ka BP. Most recent δ18Odiatom (+21.5‰) combined with present-day average δ18Olake (−16.5‰) allows calculating Tlake (∼21 °C), reflecting summer conditions. Nonetheless, the δ18Odiatom variability is associated with changes in δ18Olake rather than with Tlake. An obvious shift of ∼2‰ in the δ18Odiatom record at 11.7–11.5 cal ka BP accompanied by significant changes in diatom assemblages reflects the onset of the Holocene. Relatively high δ18Odiatom during the Early Holocene suggests relatively warm and/or dry climate with associated evaporation effects. The absolute maximum in δ18Odiatom 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 δ18Odiatom 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). An overall cooling trend (∼0.3‰ 1000 yr−1) throughout the Holocene follows decreasing solar insolation. The pattern of the Lake Emanda δ18Odiatom record is similar to that obtained from Lake El'gygytgyn suggesting a common “eastern” regional signal in both records, despite their hydrological differences. Presently, atmospheric moisture reaches the study region from the west and east with ∼40% each, as well as ∼20% from the north. © 2021 The Author(s) 
650 0 4 |a Assemblage composition 
650 0 4 |a atmospheric circulation 
650 0 4 |a atmospheric moisture 
650 0 4 |a Bacillariophyta 
650 0 4 |a climate change 
650 0 4 |a Climate change 
650 0 4 |a Climate changes 
650 0 4 |a Climate dynamics 
650 0 4 |a diatom 
650 0 4 |a Diatom assemblage 
650 0 4 |a Diatoms 
650 0 4 |a environmental change 
650 0 4 |a Environmental change 
650 0 4 |a Environmental dynamics 
650 0 4 |a freshwater ecosystem 
650 0 4 |a Glacial geology 
650 0 4 |a Holocenes 
650 0 4 |a Hydrology 
650 0 4 |a Hypsithermal 
650 0 4 |a Isotopes 
650 0 4 |a Lake sediments 
650 0 4 |a Lake sediments 
650 0 4 |a Lakes 
650 0 4 |a Little Ice Age 
650 0 4 |a Oxygen 
650 0 4 |a Oxygen isotope composition 
650 0 4 |a Sediments 
650 0 4 |a Siberia 
650 0 4 |a SIBERIA 
650 0 4 |a Stable isotopes 
650 0 4 |a Stable isotopes 
700 1 |a Biskaborn, B.K.  |e author 
700 1 |a Fernandoy, F.  |e author 
700 1 |a Kostrova, S.S.  |e author 
700 1 |a Lenz, M.M.  |e author 
700 1 |a Meyer, H.  |e author 
700 1 |a Pestryakova, L.A.  |e author 
773 |t Quaternary Science Reviews