The last ice age is known for periods of high climate variability like the period between the Last Glacial Maximum and the Younger Dryas, towards its end. Also about halfway through the ice age temperatures spiked and dipped rapidly. And then about 41,000 years ago suddenly Earth’s magnetic field weakened by some 95%, allowing a bombardment of cosmic rays, and a couple of centuries during which your compass would direct you towards Antarctica. Following this Earth´s northern hemisphere experienced the biggest volcanic eruption of the last 100,000 years, which occured in Italy.
The albedo effect still acts as a positive feedback to warming and melting. In fact the general circulation model study shows Arctic sea ice melting will speed up over recent years. From 2020 to 2030 more than 2.5 million square … Continue reading
Short news, but relevant to a possible temperature record for 2010 and to spicing up the current UN climate negotiations in Cancún:
With October in sight, and NOAA predicting a positive phase for the Arctic Oscillation, winter returns to the North Pole. That means, after some prolonged melting in the second half of September, the yearly minimum in the Arctic sea ice … Continue reading