When Willi Dansgaard and Hans Oeschger discovered the 1,500 year cycle in the Greenland ice cores in 1984, they knew immediately that it was solar-powered. They’d seen exactly the same cycle in the carbon 14 molecules in trees, and in the beryllium 10 molecules in ice cores. Both sets of molecules are formed when cosmic rays strike our atmosphere. The cycle had produced a whole series of dramatic, abrupt Medieval-Warming-to-Little-Ice-Age climate changes.
Join us on our
Share this page with your friends
on your favorite social network: