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Is there an approximation for the free board / heigth above the water? I mean, we have this "Manhattan size" comparison: how high would be the Empire State building or other famous skyscrapers compared to this "piece of ice"?

Seke Rob

If was almost shocked in awe to read that the 'fjord' (if you can call it that), is in places 1200 meter deep. If that were by glacial erosion, and the 90% rule is applied, the head of the glacier could be that much high. Not so, per this piece:

The slow velocity results in a greater duration of surface and basal melting, which effectively thins the glacier to a mere 60-70 meters at the calving front. Petermann Glacier loses 90% of its thickness before it reaches the calving front thinning from 600-700 m at the grounding line primarilly due to basal melting.

NASA's Earth Observatory has a surface air temperature map for July. The area of the Petermann Glacier appears to have been about 4 C. above average for the month:


See also this page for an animated long term temperature anomaly map:



Pii2012 is on the move since the 13th after grounding in Kane Basin. The tides are still getting higher and will peak on the 18th so other grounded ice may still move out this season. (think south of Flade Isblink)

Arctic.io's Split Zoom is up (Torsen's working on making it more robust) and is the easiest way to follow small changes in the ice.


Mike Constable

I was wondering how the rate of movement down Nares Strait of Pii2012 compares with that of the larger island that calved a couple of years back? (whether the thickness [freeboard/draft] of the berg makes a difference to the speed southwards, is it thicker because it was calved further up the fiord?).

Where has/will it get grounded to slow its progress, will fast-ice trap it for the winter? Will it affect the flow of ice through Nares by influencing the formation of ice-bridges in the area?

I was watching it on arctic.io but of course that goes blank at this season in that area. Has anyone managed to put a tracking beacon on it like they did to part of the Ayles shelf after that broke up?

Lots of thoughts - any answers (or interest?)



Pii2012 has broken into a couple of pieces with the largest having grounded on the Kane Basin sill.
There are beacons, but rather than regurgitating everything here let me direct you to Andreas Munchow's blog where all will be made clear.


BTW if you haven't read any of his articles yet, you're in for a treat.


Andreas Muenchow

Just added a new perspective as I just learnt how to access NASA's IceBridge data which includes laser altimeter and ice-penetrating radars that scan the underbelly of both Greenland's and Antarctica's ice-sheets, glaciers, ice-shelves, and much more. Happy times ...

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