scholarly journals Middle to Late Pleistocene lake‐level fluctuations of Lake El'gygytgyn, far‐east Russian Arctic

Boreas ◽  
2018 ◽  
Vol 48 (2) ◽  
pp. 516-533 ◽  
Author(s):  
Grigory Fedorov ◽  
Andrei A. Andreev ◽  
Elena Raschke ◽  
Volker Wennrich ◽  
Georg Schwamborn ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Lake Level ◽  
Far East ◽  
Russian Arctic ◽  
Lake Level Fluctuations ◽  
Lake El’Gygytgyn

scholarly journals A biomarker record of Lake El'gygytgyn, far east Russian Arctic: investigating sources of organic matter and carbon cycling during marine isotope stages 1–3

2012 ◽  
Vol 8 (5) ◽  
pp. 4625-4661
Author(s):  
A. R. Holland ◽  
S. T. Petsch ◽  
I. S. Castañeda ◽  
K. M. Wilkie ◽  
S. J. Burns ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Atmospheric Carbon Dioxide ◽  
Far East ◽  
Russian Arctic ◽  
Bulk Sediment ◽  
Alkanoic Acid ◽  
Δ13c Values ◽  
Isotopic Signatures ◽  
Lake El’Gygytgyn

Abstract. Paleoenvironmental archives in Arctic regions serve as sensitive recorders of past climate change where summer temperatures hover near freezing and small climate variations may exhibit strong threshold-crossing environment responses. Lake El'gygytgyn (Far East Russian Arctic) is a high-latitude crater impact lake that contains a continuous sediment record influenced by neither glaciation nor glacial erosion since the time of impact at 3.58 Ma. Prior research on sediments collected from Lake El'gygytygyn suggest times of permanent ice cover and anoxia corresponding to global glacial intervals, during which the sediments are laminated and are characterized by the co-occurrence of high total organic carbon, microscopic magnetite grains that show etching and dissolution, and negative excursions in bulk sediment organic matter carbon isotope (δ13C) values. Here, we investigate the abundance and carbon isotopic characteristics of lipid biomarkers recovered from Lake El'gygytygn sediments spanning marine isotope stages 1–3, to identify key sources of organic matter (OM) to lake sediments, to establish which compounds and thus OM sources drive the negative δ13C excursion exhibited by bulk sediment OM, and to explore if there are molecular and isotopic signatures of anoxia in the lake during glaciation. We find that during marine isotope stages 1–3, direct evidence for water column anoxia is lacking. A ∼4‰ negative excursion in bulk sediment δ13C values during the local Last Glacial Maximum (LLGM) is accompanied by more protracted, higher magnitude negative excursions in n-alkanoic acid and n-alkanol δ13C values that begin 20 kyr in advance of the LLGM. In contrast, n-alkanes and the C30 n-alkanoic acid do not exhibit a negative δ13C excursion at this time. Our results indicate that the C24, C26 and C28 n-alkanoic acids do not derive entirely from terrestrial OM sources, while the C30 n-alkanoic acid at Lake El'gygytgyn is a robust indicator of terrestrial OM contributions. Overall, our results strongly support the presence of a nutrient-poor water column, which is mostly isolated from atmospheric carbon dioxide during glaciation at Lake El'gygytgyn.

scholarly journals A 250 ka oxygen isotope record from diatoms at Lake El'gygytgyn, far east Russian Arctic

2012 ◽  
Vol 8 (5) ◽  
pp. 1621-1636 ◽  
Author(s):  
B. Chapligin ◽  
H. Meyer ◽  
G. E. A. Swann ◽  
C. Meyer-Jacob ◽  
H.-W. Hubberten
Keyword(s):  
Oxygen Isotope ◽  
Sediment Core ◽  
Isotope Composition ◽  
Ice Core ◽  
Far East ◽  
The Arctic ◽  
Russian Arctic ◽  
Holocene Thermal Maximum ◽  
Lake El’Gygytgyn ◽  
Mis 5.5

Abstract. In 2003 sediment core Lz1024 was drilled at Lake El'gygytgyn, far east Russian Arctic, in an area of the Northern Hemisphere which has not been glaciated for the last 3.6 Ma. Biogenic silica was used for analysing the oxygen isotope composition (δ18Odiatom) in the upper 13 m long section dating back about 250 ka with samples dominated by one taxa in the <10 μm fraction (Cyclotella ocellata). Downcore variations in δ18O values show that glacial-interglacial cycles are present throughout the core and δ18Odiatom-values are mainly controlled by δ18Oprecipitation. Changes reflect the Holocene Thermal Maximum, the Last Glacial Maximum (LGM) and the interglacial periods corresponding to MIS 5.5 and MIS 7 with a peak-to-peak amplitude between LGM and MIS 5.5 of Δ18O = 5.3‰. This corresponds to a mean annual air temperature difference of about 9 °C. Our record is the first continuous δ18Odiatom record from an Arctic lake sediment core directly responding to precipitation and dating back more than 250 ka and correlates well with the stacked marine δ18O LR04 (r = 0.58) and δD EPICA Dome-C record (r = 0.69). With δ18O results indicating strong links to both marine and ice-core records, records from Lake El'gygytgyn can be used to further investigate the sensitivity of the Arctic climate to both past and future global climatic changes.

scholarly journals A biomarker record of Lake El'gygytgyn, Far East Russian Arctic: investigating sources of organic matter and carbon cycling during marine isotope stages 1–3

2013 ◽  
Vol 9 (1) ◽  
pp. 243-260 ◽  
Author(s):  
A. R. Holland ◽  
S. T. Petsch ◽  
I. S. Castañeda ◽  
K. M. Wilkie ◽  
S. J. Burns ◽  
...  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Atmospheric Carbon Dioxide ◽  
Far East ◽  
Carbon Isotopic Composition ◽  
Russian Arctic ◽  
Bulk Sediment ◽  
Alkanoic Acid ◽  
Δ13c Values ◽  
Lake El’Gygytgyn

Abstract. Arctic paleoenvironmental archives serve as sensitive recorders of past climate change. Lake El'gygytgyn (Far East Russian Arctic) is a high-latitude crater impact lake that contains a continuous sediment record influenced by neither glaciation nor glacial erosion since the time of impact 3.58 Ma ago. Prior research on sediments collected from Lake El'gygytgyn suggest times of permanent ice cover and anoxia corresponding to global glacial intervals, during which the sediments are laminated and are characterized by the co-occurrence of high total organic carbon, microscopic magnetite grains that show etching and dissolution, and negative excursions in bulk sediment organic matter carbon isotope (δ13C) values. Here we investigate the abundance and carbon isotopic composition of lipid biomarkers recovered from Lake El'gygytgyn sediments spanning marine isotope stages 1–3 to identify key sources of organic matter (OM) to lake sediments, to establish which OM sources drive the negative δ13C excursion exhibited by bulk sediment OM, and to explore if there are molecular and isotopic signatures of anoxia in the lake during glaciation. We find that during marine isotope stages 1–3, direct evidence for water column anoxia is lacking. A ~4‰ negative excursion in bulk sediment δ13C values during the Local Last Glacial Maximum (LLGM) is accompanied by more protracted, higher magnitude negative excursions in n-alkanoic acid and n-alkanol δ13C values that begin 20 kyr in advance of the LLGM. In contrast, n-alkanes and the C30 n-alkanoic acid do not exhibit a negative δ13C excursion at this time. Our results indicate that the C24, C26 and C28 n-alkanoic acids do not derive entirely from terrestrial OM sources, while the C30 n-alkanoic acid at Lake El'gygytgyn is a robust indicator of terrestrial OM contributions. Overall, our results strongly support the presence of a nutrient-poor water column, which is mostly isolated from atmospheric carbon dioxide during glaciation at Lake El'gygytgyn.

Late Pleistocene and Early Holocene lake-level fluctuations in the Lahontan Basin, Nevada: Implications for the distribution of archaeological sites

2008 ◽  
Vol 23 (5) ◽  
pp. 608-643 ◽  
Author(s):  
Kenneth D. Adams ◽  
Ted Goebel ◽  
Kelly Graf ◽  
Geoffrey M. Smith ◽  
Anna J. Camp ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Lake Level ◽  
Early Holocene ◽  
Archaeological Sites ◽  
Lake Level Fluctuations

scholarly journals Dynamic diatom response to changing climate 0–1.2 Ma at Lake El'gygytgyn, far east Russian Arctic

2012 ◽  
Vol 8 (5) ◽  
pp. 4601-4624 ◽  
Author(s):  
J. A. Snyder ◽  
M. V. Cherepanova ◽  
A. Bryan
Keyword(s):  
Regional Climate ◽  
Far East ◽  
Russian Arctic ◽  
Sediment Record ◽  
Cold Event ◽  
Short Intervals ◽  
Lake El’Gygytgyn ◽  
Lake Circulation ◽  
Plankton Production ◽  
Cold Events

Abstract. The Lake El'gygytgyn sediment record contains an abundant diatom flora through most intervals of the lake's history providing a means to create and test hypotheses concerning the lake's response to changing climates. The 0–1.2 Ma core interval is characterized by shifts in the dominant planktonic genera and events of exceptional concentration and diversity. Warm interglacial intervals have enhanced concentration and diversity of the plankton. This response is most extreme during exceptional events corresponding to MIS 11 and 31. Diatom concentration and diversity also increases during some cold intervals (e.g. MIS 2), suggesting conditions of lake circulation and nutrient cycling promoting diatom production during these events. Short intervals of low plankton concentration accompanied by shifts in the dominant genus of the lake suggest conditions during certain cold events generate a severe impact on plankton production. The absence of these events during extended intervals of low summer insolation variability suggests a muted cold-event response of the lake system linked to regional climate.

scholarly journals Late Pleistocene and Holocene geomorphologic evolution of Laguna Las Vueltas area, Tierra del Fuego (Argentina)

2020 ◽  
Vol 47 (1) ◽  
pp. 61 ◽  
Author(s):  
Alejandro Montes ◽  
Fernando Santiago ◽  
Mónica Salemme ◽  
Ramiro López
Keyword(s):  
Late Pleistocene ◽  
Tidal Flat ◽  
Lake Level ◽  
Tierra Del Fuego ◽  
Beach Ridge ◽  
Marine Transgression ◽  
Lake Level Fluctuations ◽  
The Past ◽  
Subaerial Exposure ◽  
Geomorphologic Evolution

Laguna Las Vueltas (LLV) area retains the morphology of a late Pleistocene watershed that was flooded during a mid-Holocene marine transgression. Sediments associated with a paleosol dated at 22,582 cal yr BP reflect subaerial exposure of the area prior to the submergence during the marine transgression. This transgression produced an extensive tidal flat near the mouth of the former LLV watershed by 7,477 cal yr BP. Subsequent decoupling of the Las Vueltas valley from the sea occurred through the growth of a baymouth barrier and a beach-ridge plain to the east. This decoupling turned the lagoon into a pan environment in which subsequent lake-level fluctuations were controlled by climate. A lunette dune developed at the pans in the former lagoon, providing a narrow corridor where humans trapped, killed and processed guanacos as early as 3,402 cal yr BP. Changes in aeolian sedimentation hint at increased aridity during the past 500 years.

Late Pleistocene highstand and recession of a small, high-altitude pluvial lake, Jakes Valley, central Great Basin, USA

2006 ◽  
Vol 65 (1) ◽  
pp. 179-186 ◽  
Author(s):  
Antonio Francisco García ◽  
Martin Stokes
Keyword(s):  
High Altitude ◽  
Great Basin ◽  
Late Pleistocene ◽  
Lake Level ◽  
Storm Track ◽  
Jet Stream ◽  
Lake Levels ◽  
Lake Level Fluctuations

AbstractModels of factors controlling late Pleistocene pluvial lake-level fluctuations in the Great Basin are evaluated by dating lake levels in Jakes Valley. “Jakes Lake” rose to a highstand at 13,870 ± 50 14C Yr B.P., receded to a stillstand at 12,440 ± 50 14C yr B.P., and receded steadily to desiccation thereafter. The Jakes Lake highstand is roughly coincident with highstands of lakes Bonneville, Lahontan and Russell. The rise to highstand and recession of Jakes Lake were most likely controlled by a storm track steered by the polar jet stream. The final stillstand of Jakes Lake helps constrain timing of northward retreat of the polar jet stream during the Pleistocene–Holocene transition.

scholarly journals Biogeochemical variability during the past 3.6 million years recorded by FTIR spectroscopy in the sediment record of Lake El'gygytgyn, Far East Russian Arctic

2014 ◽  
Vol 10 (1) ◽  
pp. 209-220 ◽  
Author(s):  
C. Meyer-Jacob ◽  
H. Vogel ◽  
A. C. Gebhardt ◽  
V. Wennrich ◽  
M. Melles ◽  
...  
Keyword(s):  
Far East ◽  
Climatic Conditions ◽  
Russian Arctic ◽  
Accumulation Rates ◽  
Sediment Record ◽  
High Accumulation ◽  
Late Pliocene ◽  
The Past ◽  
Lake El’Gygytgyn ◽  
Middle Pliocene

Abstract. A number of studies have shown that Fourier transform infrared spectroscopy (FTIRS) can be applied to quantitatively assess lacustrine sediment constituents. In this study, we developed calibration models based on FTIRS for the quantitative determination of biogenic silica (BSi; n = 420; gradient: 0.9–56.5%), total organic carbon (TOC; n = 309; gradient: 0–2.9%), and total inorganic carbon (TIC; n= 152; gradient: 0–0.4%) in a 318 m-long sediment record with a basal age of 3.6 million years from Lake El'gygytgyn, Far East Russian Arctic. The developed partial least squares (PLS) regression models yield high cross-validated (CV) R2CV = 0.86–0.91 and low root mean square error of cross-validation (RMSECV) (3.1–7.0% of the gradient for the different properties). By applying these models to 6771 samples from the entire sediment record, we obtained detailed insight into bioproductivity variations in Lake El'gygytgyn throughout the middle to late Pliocene and Quaternary. High accumulation rates of BSi indicate a productivity maximum during the middle Pliocene (3.6–3.3 Ma), followed by gradually decreasing rates during the late Pliocene and Quaternary. The average BSi accumulation during the middle Pliocene was ~3 times higher than maximum accumulation rates during the past 1.5 million years. The indicated progressive deterioration of environmental and climatic conditions in the Siberian Arctic starting at ca. 3.3 Ma is consistent with the first occurrence of glacial periods and the finally complete establishment of glacial–interglacial cycles during the Quaternary.

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