Extended scaling factors for in situ cosmogenic nuclides: New measurements at low latitude

Desilets, Darin; Zréda, Marek; Prabu, T.

doi:10.1016/j.epsl.2006.03.051

Cited by 247 publications

(190 citation statements)

References 23 publications

Supporting

Mentioning

183

Contrasting

Unclassified

Order By: Relevance

“…For the timedependent adaptation of the Lal (1991) -Stone (2000 scaling model (cf. Balco et al, 2008) the difference is ~15%, whereas the scaling schemes of Dunai (2001), Desilets and Zreda (2003), Desilets et al (2006), and Lifton et al (2005) lead to denudation rates that are about 30 to 40% higher than those reported herein. The exact differences depend on, among other factors, the integration time and the sample elevation, because the altitude-dependence of nuclide production slightly differs in the various scaling models.…”

Section: Uncertainties Of the 10 Be Denudation Ratescontrasting

confidence: 45%

Landscape evolution of a bedrock peneplain on the southern Tibetan Plateau revealed by in situ-produced cosmogenic 10Be and 21Ne

et al. 2012

View full text Add to dashboard Cite

: Landscape evolution of a bedrock peneplain on the southern Tibetan Plateau revealed by in situ-produced cosmogenic 10Be and 21Ne.-Geomorphology, [153][154][192][193][194][195][196][197][198][199][200][201][202][203][204] AbstractLow-relief bedrock surfaces that occur at high altitude are a common feature of Cenozoic mountain belts and have often been used to infer a significant amount of rock uplift after their generation at low elevation. The timescale over which such surfaces can be preserved at high elevation and the rate at which they are modified by weathering and erosion are poorly known. Here we use cosmogenic 10 Be and 21 Ne to quantify the landscape evolution of a bedrock peneplain in southern Tibet that occurs at an altitude of ~5300 m. The peneplain is developed in Cretaceous granitoids and Jurassic metasediments of the northern Lhasa block (90°E, 31°N) and originally had a minimum extent of ~150 km east-west and ~75 km northsouth. It has been dissected by small rivers that generated a few hundred meters of relief and formed additional bedrock surfaces of limited extent at lower elevation. Local denudation rates for the peneplain and the lower bedrock surfaces -based on 10 Be concentrations in grus samples and amalgamated quartz clasts -cluster between 5 and 11 m Ma -1 (mean = 8.1 m Ma -1 ) and are thought to be representative for the long-term rate of downwearing of these surfaces. Samples from bedrock outcrops and bedrock blocks yield more variable rates (3-20 m Ma -1 ), which partly overestimate the long-term lowering rate, presumably due to block tilting and bedrock inhomogeneity. Spatially averaged 10 Be denudation rates for small river catchments range from 9 to 16 m Ma -1 (mean = 11.8 m Ma -1 ) and are only slightly higher than the local denudation rates. Hence, the incision and widening of valleys proceeds at low rates, which demonstrates that the landscape of the peneplain region is remarkably stable. The combined 21 Ne and 10 Be data in a subset of the samples suggest that the bedrock surfaces have experienced a simple exposure history without periods of burial. Thus, our data do not provide any evidence for extended periods of shielding by ice during past glaciations, which is consistent with the absence of erratic boulders and moraines in the peneplain region.

show abstract

Section: Uncertainties Of the 10 Be Denudation Ratescontrasting

confidence: 45%

Landscape evolution of a bedrock peneplain on the southern Tibetan Plateau revealed by in situ-produced cosmogenic 10Be and 21Ne

et al. 2012

View full text Add to dashboard Cite

show abstract

“…where is the volumetric or gravimetric water content, N is the neutron counting rate normalized to a reference atmospheric pressure [Desilets et al, 2006] and solar activity level [Kuwabara et al, 2006], N 0 is the counting rate over dry soil under the same reference conditions, and a i are fitting parameters. The soil moisture dependence of near-surface neutron intensity on a per mass basis in the fast to epithermal energy range is given by a 0 = 0.0808, a 1 = 0.372 and a 2 = 0.115 for > 0.02 kg kg −1 .…”

Section: Discussionmentioning

confidence: 99%

“…samples from 16 to 24 locations within the footprint at three or four depths from 5 cm to 25 cm, and analyzed these samples for gravimetric water content using the oven-drying method. This calibration, normalized for the difference in altitudes using scaling factors [Desilets et al, 2006], was then applied to the Mt. Lemmon site.…”

Section: Discussionmentioning

confidence: 99%

Nature's neutron probe: Land surface hydrology at an elusive scale with cosmic rays

Desilets

Zréda

Ferré

2010

Water Resources Research

308

462

View full text Add to dashboard Cite

[1] Fast neutrons are generated naturally at the land surface by energetic cosmic rays. These "background" neutrons respond strongly to the presence of water at or near the land surface and represent a hitherto elusive intermediate spatial scale of observation that is ideal for land surface studies and modeling. Soil moisture, snow, and biomass each have a distinct influence on the spectrum, height profile, and directional intensity of neutron fluxes above the ground, suggesting that different sources of water at the land surface can be distinguished with neutron data alone. Measurements can be taken at fixed sites for long-term monitoring or in a moving vehicle for mapping over large areas. We anticipate applications in many previously problematic contexts, including saline environments, wetlands and peat bogs, rocky soils, the active layer of permafrost, and water and snow intercepted by vegetation, as well as calibration and validation of data from spaceborne sensors.Citation: Desilets, D., M. Zreda, and T. P. A. Ferré (2010), Nature's neutron probe: Land surface hydrology at an elusive scale with cosmic rays, Water Resour. Res., 46, W11505,

show abstract

“…(F and G) The effect of altering the scaling scheme used. The scaling schemes are: the time-independent Lal (1991) and Stone (2000;St); Desilets et al (2006;; Dunai (2001;Du); Lifton et al (2005;Li); and time-dependent Lal (1991) and Stone (2000;Lm). In (D, E, F and G), all author-identified outliers have been removed, the New Zealand production rate is used and, where relevant, no erosion rate is applied.…”

Section: New Zealandmentioning

confidence: 99%

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

Darvill

Bentley

Stokes

et al. 2016

Quaternary Science Reviews

View full text Add to dashboard Cite

Extended scaling factors for in situ cosmogenic nuclides: New measurements at low latitude

Cited by 247 publications

References 23 publications

Landscape evolution of a bedrock peneplain on the southern Tibetan Plateau revealed by in situ-produced cosmogenic 10Be and 21Ne

Landscape evolution of a bedrock peneplain on the southern Tibetan Plateau revealed by in situ-produced cosmogenic 10Be and 21Ne

Nature's neutron probe: Land surface hydrology at an elusive scale with cosmic rays

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

Contact Info

Product

Resources

About