http://hdl.handle.net/10453/35355 2026-06-27T10:53:52Z 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/10453/195168 Title: Global, regional, and national burden of chronic kidney disease in adults, 1990-2023, and its attributable risk factors: a systematic analysis for the Global Burden of Disease Study 2023. Authors: GBD 2023 Chronic Kidney Disease Collaborators, Abstract: BACKGROUND: Chronic kidney disease (CKD) is common and ranks among the leading causes of mortality and morbidity. This analysis aimed to present global CKD estimates using the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2023 to inform evidence-based policies for CKD identification and treatment. METHODS: This analysis focused on adults aged 20 years and older over the period 1990 to 2023, from 204 countries and territories. Data sources used were published literature, vital registration systems, kidney failure treatment registries, and household surveys. Estimates of CKD burden, including deaths, incidence, prevalence, and disability-adjusted life-years (DALYs), were produced using a Cause of Death Ensemble model and a Bayesian meta-regression analytical tool. A comparative risk assessment approach estimated the proportion of cardiovascular deaths attributable to impaired kidney function and estimated risk factors for CKD. FINDINGS: Globally, in 2023, 788 million (95% uncertainty interval 743-843) people aged 20 years and older were estimated to have CKD, up from 378 million (354-407) in 1990. The global age-standardised prevalence of CKD in adults was 14·2% (13·4-15·2), a relative rise of 3·5% (2·7-4·1) from 1990. The region with the highest age-standardised prevalence was north Africa and the Middle East (18·0%; 16·9-19·4). Most people had stage 1-3 CKD, with a combined prevalence of 13·9% (13·1-15·0). In 2023, CKD was the ninth leading cause of death globally, accounting for 1·48 million (1·30-1·65) deaths, and the 12th leading cause of DALYs, with an age-standardised DALY rate of 769·2 (691·8-857·4) per 100 000. Impaired kidney function as a risk factor accounted for 11·5% (8·4-14·5) of cardiovascular deaths. High fasting plasma glucose, body-mass index, and systolic blood pressure were all leading risk factors for CKD DALYs. INTERPRETATION: CKD is a major global health issue, with rising prevalence and increasing importance as a cause of death and as a risk factor for cardiovascular death. A better understating of aetiology, appropriate screening, and implementation programmes are needed to translate advances in CKD treatment into improved patient outcomes. FUNDING: Gates Foundation, Wellcome, US National Kidney Foundation, and US National Institute of Diabetes and Digestive and Kidney Diseases. 2025-11-22T00:00:00Z http://hdl.handle.net/10453/194891 Title: Impact of unconditional cash transfers on household livelihood outcomes in Nigeria Authors: Eluwa, TF; Eluwa, GIE; Iorwa, A; Daini, BO; Abdullahi, K; Balogun, M; Yaya, S; Ahinkorah, BO; Lawal, A Abstract: In 2018, Nigeria began the implementation of a cash transfer programme (CCT) for poor and vulnerable people. We evaluated the impact of cash transfer on household livelihood outcomes in Nigeria. Using multistage cluster sampling methodology, beneficiaries and non-beneficiaries within the same locality were randomly selected to participate in a survey to assess the impact of cash transfer on food security and food diversity. When gender, marital status, educational status, and age were controlled, beneficiaries were about three times more likely than non-beneficiaries to report experiencing little or no hunger. Children 0-59 months of beneficiaries were twice likely to have at least three meals a day compared to children of non-beneficiaries. Difference in differences regression analysis showed that on the average, beneficiaries of the cash transfer significantly consumed more diverse food than non-beneficiaries. Beneficiaries of the CCT experienced fewer episodes of severe hunger, have more meal frequency, and higher household dietary diversity than non-beneficiaries. This shows that the CCT programme is effective and can directly mitigate adverse effects of malnutrition with its long-term negative impact on children and thus must be expanded to more vulnerable people across all states in Nigeria. 2025-04-01T00:00:00Z