Detecting landscape transience with in situ cosmogenic 14C and 10Be

Skov, Daniel; Egholm, David Lundbek; Jansen, John D.; Sandiford, Mike; Knudsen, Mads Faurschou

doi:10.1016/j.quageo.2019.101008

Cited by 10 publications

(15 citation statements)

References 51 publications

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“…(2012) and Skov et al. (2019) have explored erosional transience using 14 C and 10 Be at the catchment scale, our hypothetical rockwall example demonstrates that 14 C/ 10 Be ratios are also suitable for studying short‐term, spatially constrained erosional transience.…”

Section: Discussionmentioning

confidence: 59%

“…Conversely, if most samples returned ratios close to the expected uniform erosion rate value, it could be inferred that erosion occurs more or less uniformly. Whereas previous studies, notably Hippe et al (2012) and Skov et al (2019) have explored erosional transience using 14 C and 10 Be at the catchment scale, our hypothetical rockwall example demonstrates that 14 C/ 10 Be ratios are also suitable for studying short-term, spatially constrained erosional transience.…”

Section: Investigating Short-term Erosional Transience and Paleoclima...mentioning

confidence: 77%

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A Combined Cosmogenic Nuclides Approach for Determining the Temperature‐Dependence of Erosion

Dennis

Scherler

2022

JGR Earth Surface

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Physical weathering in cold, steep bedrock hillslopes occurs at rates that are thought to depend on temperature, but our ability to quantify the temperature‐dependence of erosion remains limited when integrating over geomorphic timescales. Here, we present results from a 1D numerical model of in‐situ cosmogenic 10Be, 14C, and 3He concentrations that evolve as a function of erosion rate, erosion style, and ground surface temperature. We used the model to explore the suitability of these nuclides for quantifying erosion rates in areas undergoing non‐steady state erosion, as well as the relationship between bedrock temperature, erosion rate, and erosional stochasticity. Our results suggest that even in stochastically eroding settings, 10Be‐derived erosion rates of amalgamated samples can be used to estimate long‐term erosion rates, but infrequent large events can lead to bias. The ratio of 14C to 10Be can be used to evaluate erosional stochasticity, and to determine the offset between an apparent 10Be‐derived erosion rate and the long‐term rate. Finally, the concentration of 3He relative to that of 10Be, and the paleothermometric interpretations derived from it, are unaffected by erosional stochasticity. These findings, discussed in the context of bedrock hillslopes in mountainous regions, indicate that the 10Be‐14C‐3He system in quartz offers a method to evaluate the temperature‐sensitivity of bedrock erosion rates in cold, high‐alpine environments.

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Section: Discussionmentioning

confidence: 59%

Section: Investigating Short-term Erosional Transience and Paleoclima...mentioning

confidence: 77%

A Combined Cosmogenic Nuclides Approach for Determining the Temperature‐Dependence of Erosion

Dennis

Scherler

2022

JGR Earth Surface

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“…However, combinations of several cosmogenic nuclides, with different decay constants, offer the possibility to identify transient dynamics resulting from changes in denudation rates through time (Mudd, 2016). For example, the promising 10 Be-14 C pair has been used to decipher the complex dynamics of surface processes over Holocene timescales (Hippe, 2017;Skov et al, 2019). The more common 26 Al-10 Be system, which is classically used for burial dating studies, is much less sensitive to fluctuations of denudation on this time frame (Mudd, 2016), but has been shown to offer important insights over longer timescales (Knudsen & Egholm, 2018;Struck et al, 2018), and its actual potential to decipher transient denudation evolution in slow denudation landscapes must be explored more systematically.…”

Section: Introductionmentioning

confidence: 99%

Transient hillslope erosion in slow evolution landscapes

Godard

Salgado

Siamé

et al. 2021

Earth Surf Processes Landf

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“…Due to its short half-life of 5700 ± 30 yr (Kutschera, 2019), 14 C in quartz is uniquely suited to characterize surface processes on millennial timescales (e.g., Spector et al, 2019;Pendleton et al, 2019). In situ cosmogenic 14 C measurements are also often paired with measurements of longer-lived nuclides such as 10 Be and 26 Al (e.g., Hippe, 2017;Skov et al, 2019) to study complex surface processes such as subglacial erosion and millennial-scale glacier 80 retreats/re-advances.…”

mentioning

confidence: 99%

Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic ¹⁴C production rates by muons

Dyonisius

Petrenko

Smith

et al. 2022

Preprint

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Abstract. Cosmic rays entering the Earth’s atmosphere produce showers of secondary particles such as neutrons and muons. The interaction of these neutrons and muons with oxygen-16 (16O) in minerals such as ice and quartz can produce carbon-14 (14C). Analyses of in situ produced cosmogenic 14C in quartz are commonly used to investigate the Earth’s landscape evolution. In glacial ice, 14C is also incorporated through trapping of 14C-containing atmospheric gases (14CO2, 14CO, and 14CH4). Understanding the production rates of in situ cosmogenic 14C is important to deconvolve the in situ cosmogenic and atmospheric 14C signals in ice, both of which contain valuable paleoenvironmental information. Unfortunately, the in situ 14C production rates by muons (which are the dominant production mechanism at depths of > 6 m solid ice equivalent) are uncertain. In this study, we use measurements of in situ 14C in ancient ice (> 50 kilo-annum before present, ka BP) from the Taylor Glacier ablation site, Antarctica in combination with a 2D ice flow model to better constrain the rates of 14C production by muons. We find that the commonly used values for muogenic 14C production rates (Heisinger et al., 2002a, 2002b) in ice are too high by factors of 5.7 (3.6–13.9, 95 % confidence interval) and 3.7 (2.0–11.9 95 % confidence interval) for negative muon capture and fast muon interactions, respectively. Our constraints on muogenic 14C production rates in ice allow for future measurements of 14C in ice cores to be used for other applications and imply that muogenic 14C production rates in quartz are overestimated as well.

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Detecting landscape transience with in situ cosmogenic 14C and 10Be

Cited by 10 publications

References 51 publications

A Combined Cosmogenic Nuclides Approach for Determining the Temperature‐Dependence of Erosion

A Combined Cosmogenic Nuclides Approach for Determining the Temperature‐Dependence of Erosion

Transient hillslope erosion in slow evolution landscapes

Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic ¹⁴C production rates by muons

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Detecting landscape transience with in situ cosmogenic 14C and 10Be

Cited by 10 publications

References 51 publications

A Combined Cosmogenic Nuclides Approach for Determining the Temperature‐Dependence of Erosion

A Combined Cosmogenic Nuclides Approach for Determining the Temperature‐Dependence of Erosion

Transient hillslope erosion in slow evolution landscapes

Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic 14C production rates by muons

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Using ice core measurements from Taylor Glacier, Antarctica to calibrate in situ cosmogenic ¹⁴C production rates by muons