A movable trigger: Fossil fuel CO2 and the onset of the next glaciation

  title={A movable trigger: Fossil fuel CO2 and the onset of the next glaciation},
  author={David Archer and Andrey Ganopolski},
The initiation of northern hemisphere ice sheets in the last 800 kyr appears to be closely controlled by minima in summer insolation forcing at 65°N. Beginning from an initial typical interglacial pCO2 of 280 ppm, the CLIMBER‐2 model initiates an ice sheet in the Northern Hemisphere when insolation drops 0.7 σ (standard deviation) or 15 W/m2 below the mean. This same value is required to explain the history of climate using an orbitally driven conceptual model based on insolation and ice volume… 

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