A

Arctic sea ice minimum 2007, AMO

Posted by Administrator (admin) on 9th February, 2010
A >>

The Atlantic ocean current ”Atlantic Multi decadal Oscillation” or ”AMO” sends warm water towards the north.

 

 

Obviously warmer water is bound to melt ice faster. Above AMO index and Antarctic ice area is shown. Notice the simultaneous trend shift around 2005-6.

 

 

Above: Dark blue is Arctic sea ice area. Light blue shows AMO index, that is, how much warm water reaches the North Atlantic.

Problems using summer ice as indicator of Ice area: Areas in the Arctic ocean with no ice cover receives more heating from the Sun. The summer ice melt thus shows positive feedbacks. But the Arctic Ocean areas with no ice cover in the autumn/winter leads to far bigger heat loss as the Sun is absent and no ice cover prevent radiation to space. Such Autumns we see very fast refreeze of Arctic ice cover.

Winter ice area on the other hand is a more stable indicator of Arctic Ice area..

 

Trend in ice area appears to match the AMO trend fairly. AMO peaked in 2005-6, and at this time this Arctic winter ice started growing. Therefore, the Arctic Ice area does not seem to be near a tipping point, but rather the Arctic ice area appears controlled at least partly by the AMO. (Other factors, see ”Arctic see ice minimum, the winds”).

 

 

AMO peaked last time around 1940. AMO in recent years:

 

Last changed: 9th February, 2010 at 08:42:02

Back

Comments

None Found

Add Comment