‘What have you learned from Tibetan ice cores?
"They have given us a glimpse of Tibet’s climate history going back to more than half a million years. We learned that the extent of glaciation is related to how far monsoonal rains penetrate the Tibetan Plateau. This is in step with the slow wobbling of Earth’s rotational axis, which drives tropical rainfall in 21,000-year cycles.
We also identified periods when average temperatures in Tibet went up and down by several degrees Celsius in roughly 200-year cycles. It’s still a mystery why that was the case, but we suspect this may be related to the 205-year cycle of solar activity."
By Jane Qiu
June 2, 2016
Scientific American