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Global metrics quantify shifts in chronic heatNARA Subscribed
To date, research on heat extremes has primarily focused on acute events such as heatwaves. However, many regions of the globe currently face a heat hazard that can persist for months at a time. We call this hazard ‘chronic heat’ and define it here as potentially dangerous heat that lasts for 90 days or more per year. Analyzing 30 years (1993–2023) of global weather station data using three complementary metrics, this study re...
Prolonging survival in good health is a fundamental societal goal. However, the leading determinants of disability-free survival in healthy older people have not been well established. Data from ASPREE, a bi-national placebo-controlled trial of aspirin with 4.7 years median follow-up, was analysed. At enrolment, participants were healthy and without prior cardiovascular events, dementia or persistent physical disability. Disab...
Land cover change and carbon emissions over 100 years in an A frican biodiversity hotspotNARA Subscribed
Agricultural expansion has resulted in both land use and land cover change ( LULCC ) across the tropics. However, the spatial and temporal patterns of such change and their resulting impacts are poorly understood, particularly for the presatellite era. Here, we quantify the LULCC history across the 33.9 million ha watershed of Tanzania's Eastern Arc Mountains, using geo‐referenced and digitized historical land cover maps (date...
SHRIMP dating of magmatism in the Hitachi metamorphic terrane, Abukuma Belt, Japan: Evidence for a Cambrian volcanic arcNARA Subscribed
Ion microprobe dating of zircon from meta‐igneous samples of the Hitachi metamorphic terrane of eastern Japan yields Cambrian magmatic ages. Tuffaceous schist from the Nishidohira Formation contains ca 510 Ma zircon, overlapping in age with hornblende gneiss from the Tamadare Formation ( ca 507 Ma), and meta‐andesite ( ca 507 Ma) and metaporphyry ( ca 505 Ma) from the Akazawa Formation. The latter is unconformably overlain by...
Prior laboratory studies of Trichodesmium have shown a high iron requirement that is consistent with the biochemical demand for iron in the enzyme nitrogenase. Summer delivery of iron, in the form of Saharan dust, may provide an explanation for Trichodesmium blooms observed in offshore waters of the West Florida shelf over the last 50 yr. During ecology and oceanography of harmful algal blooms (ECOHAB) field studies, backgroun...
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