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Kevin McKinney

Yeah, that's a pretty remarkable jump in the anomaly, all right. Wish I had something to say about that I haven't already said about some of the previous developments of this extraordinary melt season.

(Shakes head.)

Artful Dodger

The drop in sea ice area is impressive. More impressive is the date it occurred.

The Arctic Basin began its annual melt about 12 days earlier than 2009.
(look at the far left of the Arctic Basin graph).

Earlier onset of melt allows loss of more ice. Later freeze-up allows less to regrow.

When the length of the melt season passes a tipping point, Arctic Basin ice will be unable to recover and we will soon have a seasonally ice free Arctic (I estimate 2013).

If other feedbacks continue to extent the range of melt/freeze dates, we will have a perennially ice free Arctic Ocean (a recent paper said perhaps only decades from now).

Then, when summer SST's reach 28C, we will see Arctic hurricanes. How's that for alarmist?

Kevin McKinney

(Shakes head--again.)

Hottopicnz

Dodger, have you got a reference for that paper? I'd like to look it up...

Artful Dodger

Hot-NZ, i refer to you to this paper:

"Nonlinear threshold behavior during the loss of Arctic sea ice"
from the Proceedings of the National Academy of Sciences
December 24, 2008

You can read the complete paper online:
http://www.pnas.org/content/106/1/28.full

I also recommend this (PDF available at the bottom of the link above):
"Tipping Elements in Earth Systems Special Feature: The future of ice sheets and sea ice: Between reversible retreat and unstoppable loss"

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