Ice Complex formation on Bol'shoy Lyakhovsky Island (New Siberian Archipelago, East Siberian Arctic) since about 200 ka

2019 ◽  
Vol 92 (2) ◽  
pp. 530-548 ◽  
Author(s):  
Sebastian Wetterich ◽  
Natalia Rudaya ◽  
Vladislav Kuznetsov ◽  
Fedor Maksimov ◽  
Thomas Opel ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Late Quaternary ◽  
Late Glacial ◽  
Interglacial Period ◽  
Last Interglacial ◽  
Oxygen Isotope Stage ◽  
Mis 3 ◽  
Transport Patterns ◽  
Mis 5 ◽  
Ice Complex

AbstractLate Quaternary landscapes of unglaciated Beringia were largely shaped by ice-wedge polygon tundra. Ice Complex (IC) strata preserve such ancient polygon formations. Here we report on the Yukagir IC from Bol'shoy Lyakhovsky Island in northeastern Siberia and suggest that new radioisotope disequilibria (230Th/U) dates of the Yukagir IC peat confirm its formation during the Marine Oxygen Isotope Stage (MIS) 7a–c interglacial period. The preservation of the ice-rich Yukagir IC proves its resilience to last interglacial and late glacial–Holocene warming. This study compares the Yukagir IC to IC strata of MIS 5, MIS 3, and MIS 2 ages exposed on Bol'shoy Lyakhovsky Island. Besides high intrasedimental ice content and syngenetic ice wedges intersecting silts, sandy silts, the Yukagir IC is characterized by high organic matter (OM) accumulation and low OM decomposition of a distinctive Drepanocladus moss-peat. The Yukagir IC pollen data reveal grass-shrub-moss tundra indicating rather wet summer conditions similar to modern ones. The stable isotope composition of Yukagir IC wedge ice is similar to those of the MIS 5 and MIS 3 ICs pointing to similar atmospheric moisture generation and transport patterns in winter. IC data from glacial and interglacial periods provide insights into permafrost and climate dynamics since about 200 ka.

A geochronologic framework for the Ziegler Reservoir fossil site, Snowmass Village, Colorado

2014 ◽  
Vol 82 (3) ◽  
pp. 490-503 ◽  
Author(s):  
Shannon A. Mahan ◽  
Harrison J. Gray ◽  
Jeffrey S. Pigati ◽  
Jim Wilson ◽  
Nathaniel A. Lifton ◽  
...  
Keyword(s):  
Bone Collagen ◽  
Interglacial Period ◽  
Last Interglacial ◽  
Oxygen Isotope Stage ◽  
Fine Grained ◽  
Last Interglacial Period ◽  
Fossil Site ◽  
Shell Carbonate ◽  
Mis 5

AbstractThe Ziegler Reservoir fossil site near Snowmass Village, Colorado (USA), provides a unique opportunity to reconstruct high-altitude paleoenvironmental conditions in the Rocky Mountains during the Last Interglacial Period. We used four different techniques to establish a chronological framework for the site. Radiocarbon dating of lake organics, bone collagen, and shell carbonate, and in situ cosmogenic 10Be and 26Al ages on a boulder on the crest of a moraine that impounded the lake suggest that the ages of the sediments that hosted the fossils are between ~140 ka and >45 ka. Uranium-series ages of vertebrate remains generally fall within these bounds, but extremely low uranium concentrations and evidence of open-system behavior limit their utility. Optically stimulated luminescence (OSL) ages (n = 18) obtained from fine-grained quartz maintain stratigraphic order, were replicable, and provide reliable ages for the lake sediments. Analysis of the equivalent dose (DE) dispersion of the OSL samples showed that the sediments were fully bleached prior to deposition and low scatter suggests that eolian processes were likely the dominant transport mechanism for fine-grained sediments into the lake. The resulting ages show that the fossil-bearing sediments span the latest part of Marine Oxygen Isotope Stage (MIS) 6, all of MIS 5 and MIS 4, and the earliest part of MIS 3.

Timing of glacier fluctuations and trigger mechanisms in eastern Qinghai–Tibetan Plateau during the late Quaternary

2014 ◽  
Vol 81 (3) ◽  
pp. 464-475 ◽  
Author(s):  
XianJiao Ou ◽  
ZhongPing Lai ◽  
ShangZhe Zhou ◽  
LanHua Zeng
Keyword(s):  
Tibetan Plateau ◽  
Summer Monsoon ◽  
Late Quaternary ◽  
Late Glacial ◽  
Ice Age ◽  
Hengduan Mountains ◽  
Glacial Sediments ◽  
Oxygen Isotope Stage ◽  
Glacier Fluctuations ◽  
Mis 3

AbstractIt is highly debated whether glacial advances on the Qinghai–Tibetan Plateau (QTP) occurred as a response to temperature cooling, or whether they were forced by an increase in moisture brought by the intensive Indian summer monsoon. We here report a case study investigating this issue. Multiple moraine series in the Yingpu Valley, Queer Shan ranges of the Hengduan Mountains, and eastern QTP, provide an excellent archive for examining the timing and trigger mechanism of glacier fluctuations. Twenty-seven optically stimulated luminescence (OSL) samples of glacial sediments were collected from this valley. The quartz OSL ages show that the moraine series of Y-1, I, M and O were formed during the Late Holocene, Late Glacial, the global Last Glacial Maximum (LGM) and Marine Oxygen Isotope Stage (MIS) 3 (likely mid-MIS-3). The youngest Y-2 moraines probably formed during the Little Ice Age (LIA). The oldest H moraines formed before MIS-3. We found that glacial advances during the late Quaternary at the Yingpu Valley responded to cold stages or cold events rather than episodes of enhanced summer monsoon and moisture. As a result, glaciers in the monsoonal Hengduan Mountains were mainly triggered by changes in temperature. Millennial time scale temperature oscillations might have caused the multiple glacial advances.

Introduction to the Snowmastodon Project Special Volume The Snowmastodon Project

2014 ◽  
Vol 82 (3) ◽  
pp. 473-476 ◽  
Author(s):  
Kirk R. Johnson ◽  
Ian M. Miller ◽  
Jeffrey S. Pigati ◽  
Keyword(s):  
High Elevation ◽  
Interglacial Period ◽  
Alpine Ecosystems ◽  
Special Volume ◽  
Last Interglacial ◽  
Oxygen Isotope Stage ◽  
Last Interglacial Period ◽  
Mis 5 ◽  
Insight Into

Studies of terrestrial biotic and environmental dynamics of Marine Oxygen Isotope Stage (MIS) 5, also called the Last Interglacial Period, provide insight into the effects of long-term climate change on Pleistocene ecosystems. In North America, however, there are relatively few fossil sites that definitively date to MIS 5. Even fewer contain multiple ecosystem components (vertebrates, invertebrates, plants) that have been studied in detail, and none are located at high elevation. Thus, our view of North American ecosystems during MIS 5 is, at best, an incomplete composite view, and alpine ecosystems are entirely undocumented.

A multiproxy record of sedimentation, pedogenesis, and environmental history in the north of West Siberia during the late Pleistocene based on the Belaya Gora section

2020 ◽  
pp. 1-19
Author(s):  
Vladimir Sheinkman ◽  
Sergey Sedov ◽  
Lyudmila S. Shumilovskikh ◽  
Elena Bezrukova ◽  
Dmitriy Dobrynin ◽  
...  
Keyword(s):  
Environmental History ◽  
Boreal Forests ◽  
West Siberia ◽  
Northern Eurasia ◽  
Partial Recovery ◽  
Radiocarbon Dates ◽  
Oxygen Isotope Stage ◽  
Mis 3 ◽  
The North ◽  
Mis 5

Abstract Recent revision of the Pleistocene glaciation boundaries in northern Eurasia has encouraged the search for nonglacial geological records of the environmental history of northern West Siberia. We studied an alluvial paleosol-sedimentary sequence of the high terrace of the Vakh River (middle Ob basin) to extract the indicators of environmental change since Marine Oxygen Isotope Stage (MIS) 6. Two levels of the buried paleosols are attributed to MIS 5 and MIS 3, as evidenced by U/Th and radiocarbon dates. Palynological and pedogenetic characteristics of the lower pedocomplex recorded the climate fluctuations during MIS 5, from the Picea-Larix taiga environment during MIS 5e to the establishment of the tundra-steppe environment due to the cooling of MIS 5d or MIS 5b and partial recovery of boreal forests with Picea and Pinus in MIS 5c or MIS 5a. The upper paleosol level shows signs of cryogenic hydromorphic pedogenesis corresponding to the tundra landscape, with permafrost during MIS 3. Boulders incorporated in a laminated alluvial deposit between the paleosols are dropstones brought from the Enisei valley by ice rafting during the cold MIS 4. An abundance of eolian morphostructures on quartz grains from the sediments that overly the upper paleosol suggests a cold, dry, and windy environment during the MIS 2 cryochron.

scholarly journals A late Pleistocene long pollen record from Lake Urmia, Nw Iran

2008 ◽  
Vol 69 (03) ◽  
pp. 413-420 ◽  
Author(s):  
Morteza Djamali ◽  
Jacques-Louis de Beaulieu ◽  
Madjid Shah-hosseini ◽  
Valérie Andrieu-Ponel ◽  
Philippe Ponel ◽  
...  
Keyword(s):  
Late Glacial ◽  
Interglacial Period ◽  
Pollen Record ◽  
Glacial Period ◽  
Last Interglacial ◽  
Lake Urmia ◽  
Nw Iran ◽  
Shrub Steppe ◽  
Isotope Record ◽  
Palynological Study

A palynological study based on two 100-m long cores from Lake Urmia in northwestern Iran provides a vegetation record spanning 200 ka, the longest pollen record for the continental interior of the Near East. During both penultimate and last glaciations, a steppe ofArtemisiaand Poaceae dominated the upland vegetation with a high proportion of Chenopodiaceae in both upland and lowland saline ecosystems. WhileJuniperusand deciduousQuercustrees were extremely rare and restricted to some refugia,Hippophaë rhamnoidesconstituted an important phanerophyte, particularly during the late last glacial period. A pronounced expansion inEphedrashrub-steppe occurred at the end of the penultimate late-glacial period but was followed by extreme aridity that favoured anArtemisiasteppe. Very high lake levels, registered by both pollen and sedimentary markers, occurred during the middle of the last glaciation and late part of the penultimate glaciation. The late-glacial to early Holocene transition is represented by a succession ofHippophaë, Ephedra, Betula, Pistaciaand finallyJuniperusandQuercus. The last interglacial period (Eemian), slightly warmer and moister than the Holocene, was followed by two interstadial phases similar in pattern to those recorded in the marine isotope record and southern European pollen sequences.

scholarly journals Past climate and continentality inferred from ice wedges at Batagay megaslump in the Northern Hemisphere's most continental region, Yana Highlands, interior Yakutia

2019 ◽  
Vol 15 (4) ◽  
pp. 1443-1461 ◽  
Author(s):  
Thomas Opel ◽  
Julian B. Murton ◽  
Sebastian Wetterich ◽  
Hanno Meyer ◽  
Kseniia Ashastina ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Isotopic Fractionation ◽  
Middle Pleistocene ◽  
Winter Climate ◽  
Isotopic Signatures ◽  
Mis 3 ◽  
Winter Temperatures ◽  
Ice Wedge ◽  
Study Sites ◽  
Ice Complex

Abstract. Ice wedges in the Yana Highlands of interior Yakutia – the most continental region of the Northern Hemisphere – were investigated to elucidate changes in winter climate and continentality that have taken place since the Middle Pleistocene. The Batagay megaslump exposes ice wedges and composite wedges that were sampled from three cryostratigraphic units: the lower ice complex of likely pre-Marine Isotope Stage (MIS) 6 age, the upper ice complex (Yedoma) and the upper sand unit (both MIS 3 to 2). A terrace of the nearby Adycha River provides a Late Holocene (MIS 1) ice wedge that serves as a modern reference for interpretation. The stable-isotope composition of ice wedges in the MIS 3 upper ice complex at Batagay is more depleted (mean δ18O about −35 ‰) than those from 17 other ice-wedge study sites across coastal and central Yakutia. This observation points to lower winter temperatures and therefore higher continentality in the Yana Highlands during MIS 3. Likewise, more depleted isotope values are found in Holocene wedge ice (mean δ18O about −29 ‰) compared to other sites in Yakutia. Ice-wedge isotopic signatures of the lower ice complex (mean δ18O about −33 ‰) and of the MIS 3–2 upper sand unit (mean δ18O from about −33 ‰ to −30 ‰) are less distinctive regionally. The latter unit preserves traces of fast formation in rapidly accumulating sand sheets and of post-depositional isotopic fractionation.

Sea-level history of past interglacial periods from uranium-series dating of corals, Curaçao, Leeward Antilles islands

2012 ◽  
Vol 78 (2) ◽  
pp. 157-169 ◽  
Author(s):  
Daniel R. Muhs ◽  
John M. Pandolfi ◽  
Kathleen R. Simmons ◽  
R. Randall Schumann
Keyword(s):  
Sea Level ◽  
Late Quaternary ◽  
Tectonic Setting ◽  
Interglacial Period ◽  
Last Interglacial ◽  
Lower Terrace ◽  
Last Interglacial Period ◽  
Uranium Series Dating ◽  
Uplift Rates ◽  
History Of

AbstractCuraçao has reef terraces with the potential to provide sea-level histories of interglacial periods. Ages of the Hato (upper) unit of the “Lower Terrace” indicate that this reef dates to the last interglacial period, Marine Isotope Stage (MIS) 5.5. On Curaçao, this high sea stand lasted at least 8000 yr (~ 126 to ~ 118 ka). Elevations and age of this reef show that late Quaternary uplift rates on Curaçao are low, 0.026–0.054 m/ka, consistent with its tectonic setting. Ages of ~ 200 ka for corals from the older Cortalein unit of the Lower Terrace correlate this reef to MIS 7, with paleo-sea level estimates ranging from − 3.3 m to + 2.3 m. The estimates are in agreement with those for MIS 7 made from other localities and indicate that the penultimate interglacial period was a time of significant warmth, on a par with the present interglacial period. The ~ 400 ka (MIS 11) Middle Terrace I on Curaçao, dated by others, may have formed from a paleo-sea level of + 8.3 to + 10.0 m, or (less likely) + 17 m to + 20 m. The lower estimates are conservative compared to previous studies, but still require major ice sheet loss from Greenland and Antarctica.

scholarly journals Preliminary paleoenvironmental analysis of permafrost deposits at Batagaika megaslump, Yana Uplands, northeast Siberia

2017 ◽  
Vol 87 (2) ◽  
pp. 314-330 ◽  
Author(s):  
Julian B. Murton ◽  
Mary E. Edwards ◽  
Anatoly V. Lozhkin ◽  
Patricia M. Anderson ◽  
Grigoriy N. Savvinov ◽  
...  
Keyword(s):  
Fine Sand ◽  
Climatic Conditions ◽  
Stratigraphic Sequence ◽  
Oxygen Isotope Stage ◽  
Mis 3 ◽  
Eolian Sand ◽  
Sand Sheet ◽  
Mis 5 ◽  
Paleoenvironmental Analysis ◽  
Key Questions

AbstractA megaslump at Batagaika, in northern Yakutia, exposes a remarkable stratigraphic sequence of permafrost deposits ~50–80 m thick. To determine their potential for answering key questions about Quaternary environmental and climatic change in northeast Siberia, we carried out a reconnaissance study of their cryostratigraphy and paleoecology, supported by four rangefinder 14C ages. The sequence includes two ice complexes separated by a unit of fine sand containing narrow syngenetic ice wedges and multiple paleosols. Overall, the sequence developed as permafrost grew syngenetically through an eolian sand sheet aggrading on a hillslope. Wood remains occur in two forest beds, each associated with a reddened weathering horizon. The lower bed contains high amounts of Larix pollen (>20%), plus small amounts of Picea and Pinus pumila, and is attributed to interglacial conditions. Pollen from the overlying sequence is dominated by herbaceous taxa (~70%–80%) attributed to an open tundra landscape during interstadial climatic conditions. Of three hypothetical age schemes considered, we tentatively attribute much of the Batagaika sequence to Marine Oxygen Isotope Stage (MIS) 3. The upper and lower forest beds may represent a mid–MIS 3 optimum and MIS 5, respectively, although we cannot discount alternative attributions to MIS 5 and 7.

scholarly journals Seasonal temperature and moisture changes in interior semi‐arid Spain from the last interglacial to the Late Holocene

2021 ◽  
pp. 1-13
Author(s):  
Dongyang Wei ◽  
Penélope González-Sampériz ◽  
Graciela Gil-Romera ◽  
Sandy P. Harrison ◽  
I. Colin Prentice
Keyword(s):  
Late Holocene ◽  
Potential Evapotranspiration ◽  
Weighted Averaging ◽  
Pollen Record ◽  
Seasonal Temperature ◽  
Last Interglacial ◽  
Mis 3 ◽  
Summer Warming ◽  
Temperature Seasonality ◽  
Mis 5

Abstract The El Cañizar de Villarquemado pollen record covers the last part of MIS 6 to the Late Holocene. We use Tolerance-Weighted Averaging Partial Least Squares (TWA-PLS) to reconstruct mean temperature of the coldest month (MTCO) and growing degree days above 0°C (GDD0) and the ratio of annual precipitation to annual potential evapotranspiration (MI), accounting for the ecophysiological effect of changing CO2 on water-use efficiency. Rapid summer warming occurred during the Zeifen-Kattegat Oscillation at the transition to MIS 5. Summers were cold during MIS 4 and MIS 2, but some intervals of MIS 3 had summers as warm as the warmest phases of MIS 5 or the Holocene. Winter temperatures declined from MIS 4 to MIS 2. Changes in temperature seasonality within MIS 5 and MIS 1 are consistent with insolation seasonality changes. Conditions became progressively more humid during MIS 5, and MIS 4 was also humid, although MIS 3 was more arid. Changes in MI and GDD0 are anti-correlated, with increased MI during summer warming intervals. Comparison with other records shows glacial-interglacial changes were not unform across the circum-Mediterranean region, but available quantitative reconstructions are insufficient to determine if east-west differences reflect the circulation-driven precipitation dipole seen in recent decades.

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