Altai megafloods—The temporal context

Herget, Jürgen; Агатова, А. Р.; Carling, Paul A.; Непоп, Р. К.

doi:10.1016/j.earscirev.2019.102995

Cited by 26 publications

(17 citation statements)

References 59 publications

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“…14) clearly favor this scenario. Perhaps this reservoir was associated with surface water flows, which, according to some authors, could have arisen during catastrophic flood events caused by outbursts of the glacier-dammed lakes in the Altai Mountains (Agatova et al, 2020; Herget et al, 2020). However, more research is needed to confirm or refute this hypothesis.…”

Section: Discussionmentioning

confidence: 99%

The Volchia Griva mineral oasis as unique locus for research of the mammoth fauna and the late Pleistocene environment in Northern Eurasia

Leshchinskiy

Burkanova

2022

Quat. res.

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This paper describes the results of research at Volchia Griva, the largest site in Asia containing mammoth fauna in situ. It is situated in the south of the West Siberian Plain in the Baraba forest-steppe zone, and occupies an area of several hectares. Analysis of sediments and taphonomy of the site allows us to suggest that thousands of megafaunal remains were buried here in mud pits and erosional depressions. The favorable geochemical landscape of Volchia Griva attracted animals during periods of mineral starvation. This is reflected in the high mortality in two intervals, ca. 20–18 14C ka BP and ca. 17–11 14C ka BP. The results of palynological analysis of samples from the upper part of the Volchia Griva section made it possible to reconstruct the history of landscape changes of the Baraba Lowland during the MIS 2. Forb-mesophytic meadows were common at the beginning of this period, with taiga type forests. At ca. 20 14C ka BP, an abrupt and significant aridization of the climate occurred, which led to the degradation of forests. The mammoth steppe was widely developed, dominated by forb-grass association and with areas of alkali meadows and soils. Such conditions existed probably until the mid-Holocene.

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Section: Discussionmentioning

confidence: 99%

The Volchia Griva mineral oasis as unique locus for research of the mammoth fauna and the late Pleistocene environment in Northern Eurasia

Leshchinskiy

Burkanova

2022

Quat. res.

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“…In recent Quaternary studies, ice-marginal lakes that formed immediately following the Last Glacial Maximum (LGM) have been investigated in great detail; across the Northern Hemisphere in Europe and Asia (e.g., Batchelor et al, 2019;Emery et al, 2019;Utting and Atkinson, 2019;Dalton et al, 2020;Herget et al, 2020;Winsemann and Lang, 2020;Turzewski et al, 2020), in Greenland (Carrivick et al, 2018;Adamson et al, 2019), in South America (e.g., Hall et al, 2019;Martin et al, 2019;Thorndycraft et al, 2019;Davies et al, 2020;Mendelová et al, 2020), and the Southern Alps of New Zealand (Sutherland et al, 2019a, b). Some of these lakes have been implicated in destabilizing ice sheets (Colman, 2002) and are thought to have been a control on ice stream onset and dynamics (Stokes and Clark, 2004;Perkins and Brennand, 2015).…”

Section: Introductionmentioning

confidence: 99%

Toward Numerical Modeling of Interactions Between Ice-Marginal Proglacial Lakes and Glaciers

et al. 2020

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Global climate change is evidently manifest in disappearing mountain glaciers and receding and thinning ice sheet margins. Concern about contemporaneous proglacial lake development has spurred an emerging area of research seeking to quantitatively understand lake -glacier interactions. This perspectives article identifies spatiotemporal disparity between the coverage of field data, remote sensing observations and numerical modeling efforts. Throughout, an overview of the physical effects of lakes on glaciers and on ice sheet margins is provided, drawing evidence together from very recent and high-impact studies of both modern glaciology and of the Quaternary record. We identify and discuss six challenges for numerical modeling of lake -glacier interactions, namely that there are meltwater exchanges between glaciers and ice-marginal lakes, lake bathymetry and glacier bed topography are often unknown, lake -glacier interactions affect the longitudinal stress regime of glaciers, lake water temperature affects glacier melting but is very poorly constrained, the interactions persist with considerable spatio-temporal variability and with boundary migration, and data for model parameterization and validation is extremely scarce. Overall, we contend that numerical modeling is a key frontier in the cryospheric sciences to deliver process understanding of lake -glacier interactions.

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“…Stratigraphic context needs to be clearly established for tephrochronology and organic material for radiocarbon dating (Dugmore et al, 2013; Kirkbride et al, 2006). Even direct dating of flood deposits with optically stimulated luminescence (OSL) requires a careful linkage of sediment sequence to overall flood event stratigraphy (Herget, 2005; Herget et al, 2020; O’Connor et al, 2020). In some cases, geochronological results do not yield a high enough resolution to distinguish between separate flood events, which may occur on an annual or decadal time scale (Kershaw et al, 2005; Maizels, 1997).…”

Section: Jökulhlaup Geomorphology: An Enhanced Interpretive Frameworkmentioning

confidence: 99%

Reconstructing glacial outburst floods (jökulhlaups) from geomorphology: Challenges, solutions, and an enhanced interpretive framework

Wells

Dugmore

Beach

et al. 2022

Progress in Physical Geography: Earth and Environment

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Glacial outburst floods (jökulhlaups) have been significant drivers of landscape change across Earth throughout the Quaternary and are a contemporary hazard in Arctic and alpine regions worldwide. Geomorphologic evidence is a foundation for reconstructing past and contemporary flood events and using additional analytical methods such as geochronology and paleohydraulics. Yet, accurate interpretation of jökulhlaup landforms and depositional sequences poses a persistent challenge due to complex controls on flood hydraulics and landscape evolution. Researchers have developed numerous strategies to reduce or resolve these challenges, but a comprehensive, globally applicable model to interpret flood evidence outside of sedimentary environments is lacking. This article synthesizes existing case studies to describe jökulhlaup geomorphologic interpretive challenges, discuss strategies to resolve them, and present a conceptual model of flood landform assemblages to illustrate hydraulic and environmental controls on resultant geomorphologic impacts. This enhanced interpretive framework aids researchers in identifying, interpreting, and testing geomorphologic evidence to reconstruct past jökulhlaups and predict future flood impacts as robustly as possible at a global, landscape-wide scale. Understanding jökulhlaup geomorphology yields insight into glacial lake

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Altai megafloods—The temporal context

Cited by 26 publications

References 59 publications

The Volchia Griva mineral oasis as unique locus for research of the mammoth fauna and the late Pleistocene environment in Northern Eurasia

The Volchia Griva mineral oasis as unique locus for research of the mammoth fauna and the late Pleistocene environment in Northern Eurasia

Toward Numerical Modeling of Interactions Between Ice-Marginal Proglacial Lakes and Glaciers

Reconstructing glacial outburst floods (jökulhlaups) from geomorphology: Challenges, solutions, and an enhanced interpretive framework

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