OCTOPUS: An Open Cosmogenic Isotope and Luminescence Database

Abstract

sharing services. Thus, OCTOPUS will turn data that was previously invisible to those not within the CRN and luminescence research communities into a findable resource. This aspect is of importance to industry or local government who are yet to 15 discover the value of geochronological data in, amongst others, placing human impacts on the environment into context. The availability of the repository and its associated data curation framework will provide the opportunity for researchers to store, curate, recalculate and re-use previously published but otherwise unusable CRN and luminescence data. This delivers the potential to harness old but valuable data that would otherwise be 'lost' to the research community. The streamlined repository and transparent data re-analysis framework will also reduce research time and avoid duplication of effort, which will be highly 20 attractive to other researchers. OCTOPUS can be accessed at https://earth.uow.edu.au. The data collections can also be ac-1 Earth Syst. Sci. Data Discuss., https://doi

Short communication: Increasing vertical attenuation length of cosmogenic nuclide production on steep slopes negates topographic shielding corrections for catchment erosion rates

“…Measurement of in situ produced cosmogenic 10 Be concentrations in stream sediments has rapidly become the primary tool for quantifying catchment-scale erosion rates over timescales of 10 3 -10 5 years (Brown et al, 1995;Granger et al, 1996;von Blanckenburg, 2006;Portenga and Bierman, 2011;Codilean et al, 2018). Although requiring a number of simplifying assumptions about the steadiness of erosion and sediment transport (Bierman and Steig, 1996), erosion rates determined from 10 Be concentrations in stream sediments have yielded insights into a number of key questions in tectonic geomorphology regarding the sensitivity of erosion rates to spatiotemporal patterns of climate, tectonics, and rock strength (e.g., Safran et al, 2005; R. A. DiBiase: Increasing vertical attenuation length of cosmogenic nuclide production 2007; Ouimet et al, 2009;DiBiase et al, 2010;Bookhagen and Strecker, 2012;Miller et al, 2013;Scherler et al, 2017).…”

Denudation systematics inferred from in situ cosmogenic 10Be concentrations in fine (50–100 μm) and medium (100–250 μm) sediments of the Var River basin, southern French Alps

“…We calculated subbasin effective denudation rates by excluding nested upstream subbasins for three subbasins (VAR-16-2, TIN-16-1 and VES-16-2) following the method of Portenga et al (2015) (Table 2) to account for the local parameters of each subbasin. Furthermore, Figure 4 compares our data from the Var basin with previously published 10 Be-derived denudation rates across the Alps, as available in the OCTOPUS Database (Codilean et al, 2018). We selected 20…”

“…For the VAR-16-2, TIN-16-1 and VES-16-2 subbasins, we used subbasin 10 Be denudation rates (Table 2) to exclude their nested upstream subbasins (COU-16-1, TIN-16-2 and VES-16-1, respectively). We used the OCTOPUS database (Codilean et al, 2018) to acquire data from the Alps (Buechi et al, 2014;Chittenden et al, 2014;Delunel et al, 2010;Dixon et al, 2016;Glotzbach et al, 2013;Grischott et al, 2016;Molliex et al, 2016;Norton et al, 2008Norton et al, , 2010Norton et al, , 2011Savi et al, 2014;Wittmann et al, 2007Wittmann et al, , 2016. The nonlinear denudation model is from Montgomery and Brandon 2002 (Table 2) are used for VES-16-2 and VAR-16-2 to exclude their nested upstream subbasins (VES-16-1 and COU-16-1, respectively Integration time µm °N °E km 2 g at g -1 at g -1 at g -1 yr -1 at g -1 yr -1 at g -1 materials).…”

Short Communication: Increasing vertical attenuation length of cosmogenic nuclide production on steep slopes negates topographic shielding corrections for catchment erosion rates

“…Measurement of in situ produced cosmogenic 10 Be concentrations in stream sediments has rapidly become the primary tool for quantifying catchment-scale erosion rates over timescales of 10 3 -10 5 y (Brown et al, 1995;Granger et al, 1996;von Blanckenburg, 2006;Portenga and Bierman, 2011;Codilean et al, 2018). Although requiring a number of simplifying assumptions about the steadiness of erosion and sediment transport (Bierman and Steig, 1996), erosion rates determined from 10 Be concentrations in stream sediments have in general shown to be robust and have yielded insight to a number of key questions in tectonic geomorphology regarding the sensitivity of erosion rates to spatiotemporal patterns of climate, tectonics, and rock strength (e.g., Safran et al, 2005;Binnie et al, 2007;Ouimet et al, 2009;DiBiase et al, 2010;Bookhagen and Strecker, 2012;Miller et al, 2013;Scherler et al, 2017).…”

“…The pixel-by-pixel skyline shielding algorithm of Codilean (2006) results in the largest topographic shielding corrections, and has gained popularity due to its ease of implementation in the software packages TopoToolbox (Schwanghart and Scherler, 2014) and CAIRN (Mudd et al, 2016), the latter of which was used to recalculate published 10 Be-derived catchment erosion rates globally as part of the OCTOPUS compilation project (Codilean et al, 2018). A key simplification of the Codilean (2006) approach is that it accounts only for the skyline shielding of surface production, and not for the change in shielding with depth, which determines the sensitivity of the effective mass attenuation length for nuclide production as a function of surface slope and skyline shielding (Dunne et al, 1999;Gosse and Phillips, 2001).…”