How can fossil pollen help us understand the carbon cycle during deglaciations ?
Written by Didier M. Roche no comments
A recent collaboration between climate scientists from LSCE and palynologists from Université de Bordeaux has led to a first estimation of forests' impact on the global carbon cycle during the last fifth deglaciation (Termination V, 433–404 kyr BP).Read more How can fossil pollen help us understand the carbon cycle during deglaciations ?
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On the role of melt lakes on the speed of ice-sheet deglaciation
Written by Aurélien Quiquet no comments
Under current and forecasted climate change, it is expected that the current large ice-sheets (Greenland and Antarctica) will partially melt. One question is whether current ice sheet models include the necessary processes to dynamically simulate ice-sheet retreat. To better understand the capability of current ice-sheet models to simulate the dynamical behavior of ice-sheet retreat in periods of large climate warming, one period of interest is the last deglaciation (21 ka B.P. - 7 ka B.P.). When ice-sheet are retreating, the melt water is forming large lakes that are formed in the area where the surface is depressed by the ice-sheets. We show that these lakes can lead to large-scale ice sheet collapse and rapid sea-level rise.
Read more On the role of melt lakes on the speed of ice-sheet deglaciation