Forward modelling of the completeness and preservation of palaeoclimate signals recorded by ice‐marginal moraines

Rowan, Ann V.; Egholm, David Lundbek; Clark, Chris D.

doi:10.1002/esp.5371

Cited by 10 publications

(14 citation statements)

References 75 publications

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“…The role of topography in moraine spacing has been widely discussed (e.g. Oerlemans, 2012;Pedersen & Egholm, 2013;Barr & Lovell, 2014;Boston & Lukas, 2019;Magrani et al, 2021;Rowan et al, 2022), and this study provides a detailed example of how undu- (2022) that the largest moraines form at pinning points and that moraine spacing is larger on flatter slopes (Oerlemans, 2012). Our work at Fingerbreen demonstrates the need to take even relatively small-scale bedrock undulations in the glacier foreland into consideration in any moraine-based palaeoclimate studies.…”

Section: Topographic Controls On Glacier Dynamics and Landform Develo...mentioning

confidence: 73%

The role of topography in landform development at an active temperate glacier in Arctic Norway

Boston

Chandler

Lovell

et al. 2023

Earth Surf Processes Landf

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Topography exerts a strong control on how glaciers respond to changes in climate. Increased understanding of this role is important for both refining model predictions of future rates of glacier recession and for reconstructing climatic change from the glacial geological record. In this paper, we examine the geomorphological and sedimentological evidence in the foreland of Fingerbreen, a temperate outlet of the plateau icefield Østre Svartisen. The aim is to investigate the relationship between processes of landform generation and the changing influence of topography as recession progressed. The Fingerbreen foreland is dominated by bouldery Little Ice Age moraines and extensive areas of striated bedrock. A heavily fluted zone occurs in the central part of the foreland that is cross‐cut by annual transverse and sawtooth moraines. Systematic investigations of the structural architecture of moraines at various locations in the foreland provide evidence for a range of moraine‐forming processes, which can be linked to the topographic setting (e.g. deposition on a reverse bedrock slope) and drainage conditions. This includes push and bulldozing of proglacial sediments and squeezing of sub‐glacial sediments and submarginal freeze‐on of sediment slabs. We also identify variations in moraine spacing as a result of topography. This research demonstrates the importance of topography when interpreting moraine records in the context of climate and glacier dynamics.

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Section: Topographic Controls On Glacier Dynamics and Landform Develo...mentioning

confidence: 73%

The role of topography in landform development at an active temperate glacier in Arctic Norway

Boston

Chandler

Lovell

et al. 2023

Earth Surf Processes Landf

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“…Like others before us (Barr & Clark, 2011; Stauch & Gualtieri, 2008; Stauch et al., 2007), we speculate that these contracting continental ice masses reflect the moisture‐starved conditions caused by the massive bulk of the Laurentide and Eurasian ice sheets, which effectively divert atmospheric circulation patterns during glacial maxima (Krinner et al., 2011; Löfverström et al., 2014; Yanase & Abe‐Ouchi, 2010). However, we cannot completely exclude the possibility that the climatic conditions at Lake Malyk stayed relatively constant during periods of glacier build‐up, and that the erosional feedback and geomorphological changes from previous advancements were responsible for the shortening of the glacier (Anderson et al., 2012; Rowan et al., 2022).…”

Section: Discussionmentioning

confidence: 99%

Absence of Large‐Scale Ice Masses in Central Northeast Siberia During the Late Pleistocene

Nørgaard

Margold

Jansen

et al. 2023

Geophysical Research Letters

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Waxing and waning ice sheets and mountain glaciers have been a defining feature of the climate oscillations during the Pleistocene ice ages. Ice masses have shaped extensive tracts of Earth's surface, modified oceanic and atmospheric circulation (Toucanne et al., 2015), and stored large volumes of water periodically, driving variations in eustatic sea level (Lambeck et al., 2014;Simms et al., 2019). Significant research efforts have been directed to constraining the Pleistocene extents and chronology of the major existing and ephemeral ice sheets (Batchelor et al., 2019) together with some of the smaller ice sheets and mountain ice masses (e.g., Ivy-Ochs et al. (2008); Licciardi and Pierce (2018)). However, substantial gaps in our knowledge persist regarding the cryosphere and its history. Most notably, we are still unable to match eustatic sea level with reconstructed ice volumes during the Last Glacial Maximum (LGM, Simms et al. ( 2019)), let alone for older glacial cycles. One region in need of attention is Northeast Siberia, east of the Lena River (Figure 1), where the prevailing view is that the western Eurasian Ice Sheet effectively blocked Atlantic moisture sources from reaching Siberia, promoting an extreme continental climate inimical to the growth of major ice sheets (Krinner et al., 2011;Siegert & Marsiat, 2001). And yet, the extensive mountain landscapes of this region display over one million km 2 of formerly glaciated terrain (Barr & Clark, 2012). Glaciation of this extent could account for several meters of global sea-level equivalent, but the timing of any such ice mass is completely unresolved. Here, we aim to provide a chronological record of past glaciation in a key area of this vast, understudied region.

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“…The composite Holocene moraine sequence in the upper Khumbu Valley appears to be coherent and complete ( sensu Kirkbride & Winkler, 2012). We sampled the lateral moraines of Khumbu and Changri Nup Glaciers and the terminal and lateral moraines of Lobuche Glacier because glaciers transporting large volumes of sediment can become impounded by their moraines such that the terminal moraines may not be a reliable record of glacier change (Anderson et al., 2021; Rowan et al., 2022). However, placing our moraine geochronology in the context of regional glacial stages indicates that the timing of formation of the Last Glacial and Holocene moraines was unaffected by the influence of supraglacial debris on mass balance and ice flow.…”

Section: Discussionmentioning

confidence: 99%

“…Glaciers in the Khumbu Valley are currently mantled by extensive debris layers that formed in response to recent mass loss (Herreid & Pellicciotti, 2020; Rowan et al., 2015). During periods of glacier expansion, the majority of supraglacial debris forms ice‐marginal moraines that indicate periods of ice‐margin stability exceeding the transient response of the glacier to a change in mass balance (Rowan et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

Be‐10 Dating of Ice‐Marginal Moraines in the Khumbu Valley, Nepal, Central Himalaya, Reveals the Response of Monsoon‐Influenced Glaciers to Holocene Climate Change

et al. 2022

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Recent satellite observations suggest rapid glacier mass loss, and that debris-covered and clean-ice glaciers lose mass at similar rates (Hugonnet et al., 2021). However, a limitation of such remote-sensing observations is that they represent a relatively short timescale (decades) compared to the response times of mountain glaciers to climatic forcing (centuries) (Hambrey et al., 2008). Understanding the processes that affect how glaciers have responded to climate change through the Holocene (∼11 ka to present) is required to identify the drivers of longer-term change and constrain projections of future glacier evolution (

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Forward modelling of the completeness and preservation of palaeoclimate signals recorded by ice‐marginal moraines

Cited by 10 publications

References 75 publications

The role of topography in landform development at an active temperate glacier in Arctic Norway

The role of topography in landform development at an active temperate glacier in Arctic Norway

Absence of Large‐Scale Ice Masses in Central Northeast Siberia During the Late Pleistocene

Be‐10 Dating of Ice‐Marginal Moraines in the Khumbu Valley, Nepal, Central Himalaya, Reveals the Response of Monsoon‐Influenced Glaciers to Holocene Climate Change

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