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.
Judging by new ocean sediment measurements and climate model runs the Atlantic Meridional Overturning Circulation (AMOC) was ‘at least as strong’ during the last ice age’s Last Glacial Maximum as it is today.
Sediment deposits along shores of Antarctica, New Zealand and Chile suggest over 2 million years ago something big must have plunged somewhere in the middle of that triangle, creating a mega tsunami with hundreds of meters high waves engulfing coastal … Continue reading →
If you are interested in sea level rise news, you have a busy week. First we learn from a Nature Climate Change publication that the Greenland ice sheet is already gone. Then earlier today two studies published in Environmental Research … Continue reading →
The wooly mammoths may have succumbed to a combination of rapid climate change and human depredation, possibly by overhunting. Credit: Creative Commons/Wikimedia
The past few tens of millennia were hard times for the megafauna of the world. Hundreds of big-bodied species—from the mammoths of North America to the 3-meter-tall kangaroos of Australia to the 200-kilogram-plus flightless birds of New Zealand—just disappeared from the fossil record. A new, broad analysis continues the century-long debate over the loss of the big animals, coming down on the middle ground between blaming migrating humans for wiping them all out and climate change alone for doing them in.
We knew there must have been a connection between climate warming and damaging droughts in the world’s largest rainforest, as the two globally hottest years on record (2005 and 2010) coincide with the two record droughts in the Amazon – … Continue reading →
The most-quoted climate sensitivity range (IPCC 4AR) suggests a median temperature response to a doubling of the atmospheric CO2 concentration of 3 degrees Celsius – and a 66 percent probability range warming under CO2-doubling will be somewhere between 1.5 and … Continue reading →