A power-based abrasion law for use in landscape evolution models

Hansen, Dougal; Brooks, J.P.; Zoet, Lucas K.; Stevens, N. T.; Smith, L. C.; Bate, Charlotte E.; Jahnke, Ben

doi:10.1130/g50673.1

Cited by 6 publications

(8 citation statements)

References 25 publications

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“…This could include both a basal layer of frozen sediment ("frozen fringe"), isolated abrading clasts, or sparse, silt-sized debris. Experimental and modeling efforts suggest that these could set bed strength [234], influence slip stability [235][236][237], increase basal drag [238,239], control erosion rates [240,241], explain seismic tremors proportional to ice velocity [200], alter the form of the slip law [242], and significantly change ice viscosity [243]. However, little is currently known about the relevance of these processes at the ice-sheet scale in Greenland.…”

Section: Plos Climatementioning

confidence: 99%

Advances in monitoring glaciological processes in Kalallit Nunaat (Greenland) over the past decades

Fahrner,

Catania,

Shahin

et al. 2024

PLOS Clim

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Greenland’s glaciers have been retreating, thinning and accelerating since the mid-1990s, with the mass loss from the Greenland Ice Sheet (GrIS) now being the largest contributor to global sea level rise. Monitoring changes in glacier dynamics using in-situ or remote sensing methods has been and remains therefore crucial to improve our understanding of glaciological processes and the response of glaciers to changes in climate. Over the past two decades, significant advances in technology have provided improvements in the way we observe glacier behavior and have helped to reduce uncertainties in future projections. This review focuses on advances in in-situ monitoring of glaciological processes, but also discusses novel methods in satellite remote sensing. We further highlight gaps in observing, measuring and monitoring glaciers in Greenland, which should be addressed in order to improve our understanding of glacier dynamics and to reduce in uncertainties in future sea level rise projections. In addition, we review coordination and inclusivity of science conducted in Greenland and provide suggestion that could foster increased collaboration and co-production.

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Section: Plos Climatementioning

confidence: 99%

Advances in monitoring glaciological processes in Kalallit Nunaat (Greenland) over the past decades

Fahrner,

Catania,

Shahin

et al. 2024

PLOS Clim

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“…To test this approach, we simulated abrasion by sliding debris-laden ice over rock beds under subglacial conditions in a cryo-ring shear and a direct shear device. Hansen et al (2023).…”

Section: Subglacial Abrasion Drives Erosion For Many Glaciers Inundat...mentioning

confidence: 99%

Writing Modern Geoscience

Williams

2024

tekt

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Scientific writing is a cornerstone component of modern geoscience practice. Despite this, the subject rarely benefits from any explicit instruction during graduate training. This editorial attempts to address that gap by providing a simplified approach to writing modern geoscience papers. Implementation of this approach requires aspiring scientific writers to first consider why we as scientists write papers and what our goals should be for our audience. From there, specific and detailed advice is provided on how to best structure the idea flow and presentation within each of the primary components of a peer-reviewed manuscript (e.g. introduction, methods, results, discussion, conclusions, and abstracts). Examples of annotated, illustrative text are provided throughout. Considerable attention is paid to the notion of a scientific paper as an argument (as presented primarily in it's discussion section) in favor of some proposition, and the key aspects of what makes an argument compelling. The goal is to provide new or struggling scientific writers with an explicit mechanism to construct impactful peer-reviewed manuscripts more easily.

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“…Glacier beds span a continuum from rigid bedrock, cleared of loose debris (“hard beds”; Woodard et al., 2021), to deformable sediment (“soft beds”; Hansen & Zoet, 2022). When the fringe slides over a hard bed, entrained debris enhances drag at the ice‐bed interface through rock‐on‐rock friction (Hansen & Zoet, 2019; Thompson et al., 2020), eroding the bed through abrasion (Hansen et al., 2023) and influencing slip‐stability by facilitating rate‐weakening friction (Stevens et al., 2024). Sediment inclusions also modify the viscosity of basal ice, affecting slip resistance as the ice deforms around stationary bed obstacles (Moore, 2014, their Section 2).…”

Section: Introductionmentioning

confidence: 99%

Presence of Frozen Fringe Impacts Soft‐Bedded Slip Relationship

Hansen,

Warburton,

Zoet

et al. 2024

Geophysical Research Letters

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Glaciers and ice streams flowing over sediment beds commonly have a layer of ice‐rich debris adhered to their base, known as a “frozen fringe,” but its impact on basal friction is unknown. We simulated basal slip over granular beds with a cryogenic ring shear device while ice infiltrated the bed to grow a fringe, and measured the frictional response under different effective stresses and slip speeds. Frictional resistance increased with increasing slip speed until it plateaued at the frictional strength of the till, closely resembling the regularized Coulomb slip law associated with clean ice over deformable beds. We hypothesize that this arises from deformation in a previously unidentified zone of weakly frozen sediments at the fringe's base, which is highly sensitive to temperature and stress gradients. We show how a rheologic model for ice‐rich debris coupled with the thermomechanics of fringe growth can account for the regularized Coulomb behavior.

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A power-based abrasion law for use in landscape evolution models

Cited by 6 publications

References 25 publications

Advances in monitoring glaciological processes in Kalallit Nunaat (Greenland) over the past decades

Advances in monitoring glaciological processes in Kalallit Nunaat (Greenland) over the past decades

Writing Modern Geoscience

Presence of Frozen Fringe Impacts Soft‐Bedded Slip Relationship

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