Late Quaternary climate history of Northern Siberia - evidence from ground ice (Die spätquartäre Klimageschichte Nordsibiriens - Ergebnisse aus Untersuchungen an Grundeis)
Why this work is in the frame
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Bibliographic record
Abstract
Large areas of Russia, especially in Northern Siberia, are characterised by a severe continental climate and continuous permafrost conditions.On Bykovsky Peninsula and Big Lyakhovsky Island, located in the Laptev Sea region, ice-rich permafrost deposits were studied in order to decipher the climatic variations of the Late Quaternary.Ground ice and in particular ice wedges were analysed by means of stable hydrogen and oxygen isotopes in the framework of the multidisciplinary research project "Paleoclimate signals in ice-rich permafrost".The main goals of the research program are the reconstruction of the paleoclimatic and paleoenvironmental conditions in ice-rich permafrost areas of Northern Siberia.The Ice Complex, a peculiar cryolithogenic formation, is typical for the nonglaciated lowland areas of Northern Siberia.It was formed between 60 ka and 12 ka BP, and is characterised by syngenetic ice wedge growth in ice-rich deposits.As shown in the stable isotopes, ice wedges are mainly fed by meltwater of the winter precipitation and, thus reflect winter temperatures.Water from the adjacent Sediment may alter the isotopic composition of an ice wedge at its margins.The presence of ice wedges as indicative feature for permafrost conditions since 60 ka BP, implies that a large glacier extending over the Laptev Sea shelf did not exist during the Late Glacial Maximum.Sediment and ice wedges with an age of 200 ka underlay the Ice Complex on Big Lyakhovsky Island.This is the oldest ground ice ever analysed by hydrogen and oxygen isotopes.The comparison between the stable isotope records of ice wedges from the individuat sites reveal a period of extremely cold winter temperatures between 60 and 50 ka BP.Between 50 and 20 ka BP, the winters were relatively cold and stable.A sharp rise in the stable isotope ratios of ice wedges is found for the Pleistocene-Holocene boundary, interpreted as a climatic warming trend.For the Early Holocene warm period (8-4.5 ka BP), thermokarst processes formed lacustrine environments, which restricted ice wedge growth.After 4.5 ka BP, Holocene ice wedges grew until present in thermo-erosional valleys and in thermo-karst depressions after the lakes feil dry.The isotopic composition of recent ice wedges was used for the reconstruction of absolute winter and January temperatures of the older units.The combination of H and 0 isotope analyses of precipitation and ground ice is useful to identify moisture sources for the Laptev Sea region.For the winter precipitation of the western Laptev Sea, a change in the moisture source to the present North Atlantic source was proved between 18.5 and 11.2 ka BP.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.000 | 0.004 |
| Open science | 0.003 | 0.000 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.005 | 0.005 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it