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<b>Scientists Report Evidence For Sun-Climate Link</b><br /><br />LINK<br /><br />A team led by University of Maine scientists has reported finding a potential link between changes in solar activity and the Earth's climate. In a paper due to be published in an upcoming volume of the Annals of Glaciology, Paul Mayewski, director of UMaine's 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 sun's output.<br /><br />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. <br /><br />The researchers' goal is to understand what drives the Earth's 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.<br /><br />Mayewski founded the International Transantarctic Scientific Expedition (ITASE) and is the co-author of The Ice Chronicles: The Quest to Understand Global Climate Change, published in 2002 with Frank White. The United States' ITASE office is located at UMaine. Antarctic locations u