Ice Rhythms—Core Reveals a Plethora of Climate Cycles

A record of climate extracted from Greenland's ice has laid out the whole spectrum of climate variations on scales of a few thousand years, from the well-known cycles of about 40,000 and 23,000 years, driven by the tilting and wobbling of Earth's axis, down the scale to cycles of 11,100, 6100, and 1450 years. Climate researchers have argued about the causes of these shorter cycles, but the crisp new record may be key to deciphering them.