A team led by University of Maine scientists has reported finding a potential link between changes in solar activity and the Earths climate. In a paper due to be published in an upcoming volume of the Annals of Glaciology, Paul Mayewski, director of UMaines Climate Change Institute, and 11 colleagues from China, Australia and UMaine describe evidence from ice cores pointing to an association between the waxing and waning of zonal wind strength around Antarctica and a chemical signal of changes in the suns output.
At the heart of the paper, Solar Forcing of the Polar Atmosphere, are calcium, nitrate and sodium data from ice cores collected in four Antarctic locations and comparisons of those data to South Pole ice core isotope data for beryllium-10, an indicator of solar activity. The authors also point to data from Greenland and the Canadian Yukon that suggest similar relationships between solar activity and the atmosphere in the northern hemisphere. They focus on years since 1400 when the Earth entered a roughly 500-year period known as the Little Ice Age.
The researchers goal is to understand what drives the Earths climate system without taking increases in greenhouse gases into account, says Mayewski. "There are good reasons to be concerned about greenhouse gases, but we should be looking at the climate system with our eyes open," he adds. Understanding how the system operates in the absence of human impacts is important for responding to climate changes that might occur in the future.
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MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
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