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Increased variability of the Arctic summer ice extent in a warmer climate
 

Summary: Increased variability of the Arctic summer ice extent
in a warmer climate
H. Goosse,1
O. Arzel,2
C. M. Bitz,3
A. de Montety,1
and M. Vancoppenolle1
Received 19 August 2009; revised 13 October 2009; accepted 27 October 2009; published 1 December 2009.
[1] Simulations performed with general circulation models
and a model of intermediate complexity show that the
variability of the September sea ice extent in the Arctic of the
21st century increases first when the mean extent decreases
from present-day values. A maximum of the variance is
found when the mean September ice extent is around 3
million km2
. For lower extents, the variance declines with the
mean extent. The behavior is clearly different in Antarctica
where the variance always decreases as the mean ice extent
decreases, following roughly a square-root law compatible
with very simple geometric arguments. Several mechanisms

  

Source: Arzel, Olivier - Climate Change Research Centre, University of New South Wales

 

Collections: Geosciences