The Canary in the Coal Mine

[Vergent]

With its 30% definition of "extent" DMI extent is the canary in the coal mine with respect to the popping of the extent balloon. Assuming this is not another glitch, vast areas are dropping below 30% and we will soon be below 2009 & 10 on DMI. The NSIDC, MASIE, and JAXA will follow. 30% ice does not survive the fall storms.

Vergent

[Jim Hunt]

With its 30% definition of "extent" DMI extent is the canary in the coal mine

Isn't that the "new" DMI extent chart, which now uses an "industry standard" 15% threshold?

The 30% version looks a bit different:

http://ocean.dmi.dk/arctic/old_icecover.uk.php

[Vergent]

My bad.

Neven's link on ASIG doesn't go to the page with the explanation. The loss rate is just as alarming for 15%. Do they have a numerical archive? It looks like DMI lost 1,000k in a week. If true, and not a glitch of some sort, it ratifies my contention that there is no speed limit for extent loss when there is a low CAPIE and parallel melting. Where there was one when the melting was limited to the edges.

Vergent

[Neven]

Neven's link on ASIG doesn't go to the page with the explanation.

Sorry about that, Vergent. Give me the link and I'll attach it to the graph on the ASIG.

Do they have a numerical archive?

Not online, I believe, though Larry Hamilton had a contact there and would let us know the numbers occasionally last year.

[Vergent]

Neven,

http://ocean.dmi.dk/arctic/icecover.uk.php

Vergent

[Neven]

Thanks, Vergent. Fixed now.

[Vergent]

Jim Hunt, Neven,

Thanks for pointing out my error. And thanks for fixing the link. In looking at the DMI description I followed their data source link. That led to the osisaf data portal.

http://www.osi-saf.org/index.php

They have a number of interesting products, some that I have not seen before.




Not the least of which is their "Ice types" product.



Its higher resolution and of a significantly different opinion from the Russian product(the only MYI/FYI product on ASIG). It is near real time rather than weekly so I suggest that this would be a useful addition to ASIG this winter, right now, all arctic ice is ambiguous, so it is simply ice extent, but come Jan 1, it should be of interest.

http://osisaf.met.no/p/ice/nh/type/type.shtml

Here is the link to the quick look archive.

Vergent

[Phil.]

Vergent, that is the russian product, see the © statement in the legend.

[Vergent]

Vergent, that is the russian product, see the © statement in the legend.

Yes and the top one is OSISAF, the data source DMI credits. They both are clearly labeled, I was comparing them.

Vergent

[Bob Wallace]

Nevin, the label at above the DMI graph still says 30%.