http://hdl.handle.net/10453/35348 2026-06-27T12:13:22Z http://hdl.handle.net/10453/195418 Title: Grand Canyon landslide-dam and paleolake triggered by the Meteor Crater impact at 56 ka Authors: Karlstrom, KE; Baisan, CH; Kring, DA; Hereford, R; Turney, C; Hogg, A; Norman, LM; O’Brien, P; Palmer, JG; Rittenour, TM; Ballensky, J; Crossey, LJ Abstract: This paper hypothesizes that the Meteor Crater impact in Arizona, USA, 56,000 years ago triggered landslides in Grand Canyon that dammed the Colorado River and formed Nan koweap paleolake. This is compatible with shock and earthquake physics for the impact that infer a M5.4 seismic event, attenuated to an effective magnitude of M3.5 at Grand Canyon. Results that support the hypothesis include radiocarbon dating of driftwood and lumines cence dating of associated slack-water lake sediments that are preserved in caves up to 60 m above the modern Colorado River. Radiocarbon ages from two locations, including Stanton’s Cave, date the driftwood as 55.25 ± 2.44 ka (n = 4). Sediments associated with the driftwood gave a luminescence age of 56.00 ± 6.39 ka (n = 2). These six Grand Canyon dates, and three published ages for the Meteor Crater impact, show statistically indistinguishable results that support the hypothesis for a geologically instantaneous series of events with a mean age of 55.60 ± 1.30 ka. This work highlights the value of radiocarbon dating near the limits of the technique, integration of multiple dating methods, and seismic and landslide hazards associ ated with meteorite impacts in regions of extreme topography like Grand Canyon. 2025-07-15T00:00:00Z http://hdl.handle.net/10453/195417 Title: Development of the Intcal Database Authors: Bronk Ramsey, C; Adolphi, F; Austin, W; Bard, E; Bayliss, A; Blaauw, M; Cheng, H; Edwards, RL; Friedrich, M; Heaton, T; Hogg, A; Hua, Q; Hughen, K; Kromer, B; Manning, S; Muscheler, R; Palmer, J; Pearson, C; Reimer, P; Reimer, R; Richards, D; Scott, M; Southon, J; Turney, C; Wacker, L Abstract: The IntCal family of radiocarbon (14C) calibration curves is based on research spanning more than three decades. The IntCal group have collated the 14C and calendar age data (mostly derived from primary publications with other types of data and meta-data) and, since 2010, made them available for other sorts of analysis through an open-access database. This has ensured transparency in terms of the data used in the construction of the ratified calibration curves. As the IntCal database expands, work is underway to facilitate best practice for new data submissions, make more of the associated metadata available in a structured form, and help those wishing to process the data with programming languages such as R, Python, and MATLAB. The data and metadata are complex because of the range of different types of archives. A restructured interface, based on the "IntChron"open-access data model, includes tools which allow the data to be plotted and compared without the need for export. The intention is to include complementary information which can be used alongside the main 14C series to provide new insights into the global carbon cycle, as well as facilitating access to the data for other research applications. Overall, this work aims to streamline the generation of new calibration curves. 2025-01-01T00:00:00Z http://hdl.handle.net/10453/195253 Title: Shortcuts for accelerating food system transitions Authors: Moallemi, EA; Hall, A; Leith, P; Miller, M; Sperling, F; Raven, R; Frantzeskaki, N; Palmer, J; Battaglia, M; Bruce, J; Hebinck, A; de Haan, F; Godde, C; Grigg, N; Boylan, S; Szetey, K; Chakori, S; Lema, Z; Onyango, E; Stafford-Smith, M; Whitten, S; McMillan, L Abstract: In light of ongoing global challenges of health, climate change, and food security, there is urgent need to transform our food systems. Here, we call for stakeholders to leverage collective wisdom garnered from more than two decades of sustainability transitions research into developing and implementing systemic approaches to shortcut theory to action and accelerate the transformation of global food systems. 2024-03-15T00:00:00Z http://hdl.handle.net/10453/195252 Title: Applying an ethical lens for more responsible modelling practice Authors: Szetey, K; Ward, D; Chakori, S; Douglas, D; Fulton, EA; Grigg, N; Ligtermoet, E; Munera-Roldan, C; Onyango, E; Stirling, E; Subramaniam, R Abstract: In recent years there has been an increasing emphasis on including humans when modelling socio-environmental systems. However, it is crucial that we remain mindful of the impacts that the decisions made during model development or analysis can have on people or nature as modelling is not an impartial process. Responsible modelling requires us to consider the broader societal implications of our work, therefore, modellers should consider a range of ethical concerns, often found beyond those prescribed through institutionally mandated ethical approval processes. Herein we examine the ethical dimensions of six socio-environmental case studies using the principles of credibility, legitimacy, and salience, encompassing the modelling process from conception to delivery and beyond. We also discuss the results from an interdisciplinary workshop held with experienced modellers to co-produce a list of ethical dimensions that modellers would ideally engage with when conducting a modelling project. Based on our findings, we have developed a set of recommendations to: i) support modellers in ensuring their modelling practice is underpinned by ethical reflection, ii) guide end-users of model outputs when selecting and repurposing those outputs, and iii) identify means by which institutions can support responsible modelling practices. Engaging with ethical dimensions in the process of modelling is critical for building trust with stakeholders, therefore enhancing the credibility, legitimacy, and salience of the models and research.