Ice cores from low latitudes can provide a wealth of unique information about past climate in the tropics, but they are difficult to recover and few exist. Here, we report annually resolved ice core records from the Quelccaya ice cap (5670 meters above sea level) in Peru that extend back ~1800 years and provide a high-resolution record of climate variability there. Oxygen isotopic ratios (δ(18)O) are linked to sea surface temperatures in the tropical eastern Pacific, whereas concentrations of ammonium and nitrate document the dominant role played by the migration of the Intertropical Convergence Zone in the region of the tropical Andes. Quelccaya continues to retreat and thin. Radiocarbon dates on wetland plants exposed along its retreating margins indicate that it has not been smaller for at least six millennia.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.1234210 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Delirium and Cognitive Screening in National Hip Fracture Registries: Scoping Review Protocol.
HRB Open Res
January 2025
School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin, Ireland.
Background: Delirium and cognitive impairment are common in hip fracture populations and are associated with significant adverse patient outcomes. National hip fracture registries facilitate improvements in patient outcomes and care quality, such as reduced mortality and the development of specialist multidisciplinary services. However, there is substantial variation in the data collected and reported in relation to delirium and cognition, which impedes international comparison and may reduce quality of care.
View Article and Find Full Text PDFForecasting the number of rural migrant workers in Chongqing using the optimized grey N_Verhulst model.
Sci Rep
January 2025
School of International Business, Chongqing Finance and Economics College, Chongqing, China.
Scientific prediction of migrant worker numbers provides decision-making references for resolving rural talent supply issues. Based on the evolutionary patterns and data features of Chongqing's migrant workers, a new grey prediction model is constructed. The new model is constructed by introducing fractional-order operators in the real domain.
View Article and Find Full Text PDFGlucose Lowering through Weight management (GLoW): a randomised controlled trial of the clinical and cost effectiveness of a diabetes education and behavioural weight management programme vs a diabetes education programme in adults with a recent diagnosis of type 2 diabetes.
Diabetologia
January 2025
MRC Epidemiology Unit, School of Clinical Medicine, University of Cambridge, Cambridge, UK.
Aims/hypothesis: UK standard care for type 2 diabetes is structured diabetes education, with no effects on HbA, small, short-term effects on weight and low uptake. We evaluated whether remotely delivered tailored diabetes education combined with commercial behavioural weight management is cost-effective compared with current standard care in helping people with type 2 diabetes to lower their blood glucose, lose weight, achieve remission and improve cardiovascular risk factors.
Methods: We conducted a pragmatic, randomised, parallel two-group trial.
Time trends of catheter-directed treatment in acute pulmonary embolism in Germany.
Res Pract Thromb Haemost
January 2025
Department of Cardiology, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany.
Background: Catheter-directed treatment (CDT) is an innovative treatment for patients with elevated risk pulmonary embolism (PE) to resolve embolus and restore pulmonary perfusion.
Objectives: We aimed to analyse the use and the benefit of CDT in PE patients in Germany.
Methods: The German nationwide inpatient sample was used to include all hospitalizations of patients with PE from 2005 to 2020 in Germany.
Carotid artery atherosclerotic stenosis is an important annual cause of stroke in the United States. Moreover, the incidence of carotid artery stenosis is significantly increasing due to the widespread popularity of high fat and high salt diets, sedentary lifestyles, and the increasing age of the population. Of major importance to cardiovascular specialists is the fact that individuals with atherosclerotic carotid artery stenosis can have a prevalence of atherosclerotic coronary artery disease as high as 50 to 75%.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!