Cryosphere > Glaciers

Barnes Ice Cap / Penney Ice Cap

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Tealight:
On the 8th of August most of the snow on Barnes Ice Cap has melted apart from the very top. This reveals an interesting pattern of white parallel lines flowing down the ice cap. Most of these are dried out meltwater streams. Only a few are light blue and have meltwater flowing down.

The pattern reminds me of a skeleton from a prehistoric animal buried in sand or rock.



Click to see full resolution

budmantis:
Thanks for starting this thread Tealight. I'm particularly interested in the Barnes and the Penney Ice Cap because they are the last vestiges of the great Laurentide ice sheet from the last glacial maximum. What I'm wondering is how much more warming, if any it would take to render these ice caps extinct. Judging from the satellite images, the entire Barnes ice cap seems to have experienced some melt this summer with the possible exception of the area at the  highest elevation. Your images were very helpful as I'm not very good in that department.

By the way, isn't that the fossil of a trilobite?

Tealight:

--- Quote from: budmantis on August 27, 2016, 05:48:33 AM ---Thanks for starting this thread Tealight. I'm particularly interested in the Barnes and the Penney Ice Cap because they are the last vestiges of the great Laurentide ice sheet from the last glacial maximum. What I'm wondering is how much more warming, if any it would take to render these ice caps extinct. Judging from the satellite images, the entire Barnes ice cap seems to have experienced some melt this summer with the possible exception of the area at the  highest elevation. Your images were very helpful as I'm not very good in that department.

By the way, isn't that the fossil of a trilobite?

--- End quote ---

Yeah both ice caps are worth to keep an eye on. I added Penney Ice Cap to the subject line since they have many similarities.

I tried to estimate surface retreat of the Barnes Ice Cap, but failed to find any significant changes. Earlier images have only 15m or 30m resolution and don't line up exactly with the new Sentinel 2 images. A 10-15m retreat would only be one pixel difference which is far less than the accuracy of my image manipulation and overlaying skills.

I'm not an expert on fossils, but it looks like other trilobite from wikipedia. All I did was search fossil on Google image search and selected one that looks quite similar. Maybe there are other skeletons that meet the pattern.

Espen:
Barnes Ice Cap, Baffin Island: The retreat of the ice cap is clearly seen in this animation 1975 - 2016 (41 years):

Please click to animate and enlarge!

budmantis:
Espen: I can get the image to enlarge, but it wont animate.

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