The historical legacy of spatial scales in freeze–thaw weathering: Misrepresentation and resulting misdirection

Hall, Kevin; Thorn, Colin E.

doi:10.1016/j.geomorph.2010.10.003

Cited by 53 publications

(30 citation statements)

References 58 publications

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“…Unpacked in this fashion it is easy to see that the chain of events could also cause weathering by: wetting and drying; thermal stress (given adequate rates); chemical processes (dependent upon impurities, temperature, and rock type); and salt specifically. However, conventionally the freezing and thawing of rock is interpreted exclusively in terms of the freeze-thaw process (Hall and Thorn, 2011). Two important questions emerge, 1) How should the total weathering achieved be apportioned among the suite of processes actually involved?…”

Section: The Role Of Weather In Weatheringmentioning

confidence: 99%

“…Frost action must be dependent upon moisture availability, rock permeability and freezing temperatures each of which is independently limiting. Given a disparate set of 'filters' the entire process is highly constrained in operation (Hall et al, 2002;Hall and Thorn, 2011). In warm to hot climate simulations schists have been shown to be impacted mechanically by salts (e.g., Wells et al, 2006) or by rapid chemical weathering and solution (Sharmeen and Willgoose, 2006) due to high rock temperatures (70°C) combined with a high annual rainfall (1480 mm).…”

Section: The Role Of Parent Materialsmentioning

confidence: 99%

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On the persistence of ‘weathering’

2012

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Section: The Role Of Weather In Weatheringmentioning

confidence: 99%

Section: The Role Of Parent Materialsmentioning

confidence: 99%

On the persistence of ‘weathering’

2012

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“…Moisture is often present in mountain environments, but in certain cases precipitation may be more important than temperature in limiting frost action (Sass, 2005;Hall and Thorn, 2011). Hyper-arid regions, for instance, are too dry to promote frost cracking (Hall et al, 2002) and polar deserts sustain the slowest denudation rates on Earth (Portenga and Bierman, 2011).…”

Section: Water Availabilitymentioning

confidence: 99%

The periglacial engine of mountain erosion – Part 2: Modelling large-scale landscape evolution

et al. 2015

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Abstract. There is growing recognition of strong periglacial control on bedrock erosion in mountain landscapes, including the shaping of low-relief surfaces at high elevations (summit flats). But, as yet, the hypothesis that frost action was crucial to the assumed Late Cenozoic rise in erosion rates remains compelling and untested. Here we present a landscape evolution model incorporating two key periglacial processes -regolith production via frost cracking and sediment transport via frost creep -which together are harnessed to variations in temperature and the evolving thickness of sediment cover. Our computational experiments time-integrate the contribution of frost action to shaping mountain topography over million-year timescales, with the primary and highly reproducible outcome being the development of flattish or gently convex summit flats. A simple scaling of temperature to marine δ 18 O records spanning the past 14 Myr indicates that the highest summit flats in mid-to high-latitude mountains may have formed via frost action prior to the Quaternary. We suggest that deep cooling in the Quaternary accelerated mechanical weathering globally by significantly expanding the area subject to frost. Further, the inclusion of subglacial erosion alongside periglacial processes in our computational experiments points to alpine glaciers increasing the long-term efficiency of frost-driven erosion by steepening hillslopes.

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“…Links between these microscale manifestations of weathering and the rather larger scale questions of rock slope instability are uncertain and debated (Viles, 2001;Hall and Thorn, 2011), although discontinuities (from micro-cracks to joints) may provide one key link between scales. Links between these microscale manifestations of weathering and the rather larger scale questions of rock slope instability are uncertain and debated (Viles, 2001;Hall and Thorn, 2011), although discontinuities (from micro-cracks to joints) may provide one key link between scales.…”

Section: Complexities Of Weathering On Rock Slopesmentioning

confidence: 99%

Linking weathering and rock slope instability: non‐linear perspectives

Viles

2012

Earth Surf Processes Landf

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Weathering is linked complexly to the erosion and evolution of rock slopes. Weathering influences both the strength of rock slopes and the stresses that act upon them. While weathering has often been portrayed in an over‐simplified way by those studying rock slope instability, in reality it consists of multiple processes, acting over different spatial and temporal scales, with many complex inter‐linkages. Through a demonstration of the sources of non‐linearities in rock slope weathering systems and their implications for rock slope instability, this paper proposes five key linkages worthy of further study. Copyright © 2012 John Wiley & Sons, Ltd.

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The historical legacy of spatial scales in freeze–thaw weathering: Misrepresentation and resulting misdirection

Cited by 53 publications

References 58 publications

On the persistence of ‘weathering’

On the persistence of ‘weathering’

The periglacial engine of mountain erosion – Part 2: Modelling large-scale landscape evolution

Linking weathering and rock slope instability: non‐linear perspectives

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