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Aerial Peri-Glacial Patterned Ground


Aerial Peri-Glacial Patterned Ground
Photo Information
Copyright: James Parker (Jamesp) Gold Star Critiquer/Gold Note Writer [C: 1369 W: 9 N: 6334] (18906)
Genre: Landscapes
Medium: Color
Date Taken: 1994-08
Categories: Mountain
Photo Version: Original Version
Theme(s): Earth from Above, Geological Wonders [view contributor(s)]
Date Submitted: 2007-03-20 10:32
Viewed: 9975
Points: 16
[Note Guidelines] Photographer's Note
I think this was taken from about 1,000ft. Although not a brilliant shot it is a scanned slide taken in 1994, using a Pentax Z1 28 80 lense and Agfa 100 asa film, but it does show a good view of peri-glacial patterned ground.

I was in a float plane returning from Herschel Island approx 69 degrees N. We were looking for Musk Ox and I think the pilot thought I had taken leave of my senses when I started taking shots of the ground.

This aerial view of patterned ground, by the MacKenzie Delta, North-West Territories, Canada shows the characteristic polygonal fractures that result from freezing and thawing processes. In this photo, most of the polygons are probably 5-14 meters in diameter.

Repeated cycles of freezing and thawing in the upper part of Gelisols (peri-glacial soils) along with the associated processes of frost-heaving and ice wedge formation, eventually create micro relief within individual polygons. The outer polygon becomes a frost-heaved ridge and the centre becomes a collapsed depression which summer becomes a small pool. The water cannot escape as the whole landscape is underlain by permafrost.

Anyway, good quality or not I hope it shows an aerial view of something people may not have seen.

Argus, cicindela, SelenE, ramthakur, fungiman, Adanac, lovenature, nat has marked this note useful
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To lovenature: RoadsJamesp 1 03-21 04:09
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Critiques [Translate]

  • Great 
  • Argus Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5038 W: 260 N: 15594] (50626)
  • [2007-03-20 10:53]

Hello James,
I certainly haven't seen a shot like this, though I am a little familiar with the phenomenon it depicts and this shot is certainly good enough to show very well periglacial terrain as seen from the air. As this is unusual, interesting and well described in your note, I would say this is an excellent contribution to TN and I thank you for that!
Regards, Ivan

Hello James!
I agree with Ivan, this is a very interesting presentation! I really have to say, that as for the first view I had no idea what is on the photo. At first I strated to think that maybe it is a picture taken with microscope and here we have some plant cells or something similar :)
But fortunatelly this is another picture thanks to which I could learn something new again :)
Many thanks and best greetings,
Radomir

  • Great 
  • SelenE Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2249 W: 65 N: 4205] (13972)
  • [2007-03-20 12:10]

Hi James,
The aerial view of this place looks very interesting. Thank you for the photo and the informative notes.
Selen

Hello James,
I agree; this is a wonderful aerial view of the processes taking place on a delta in Canada.
The patterns are interesting and look nice in this shot. Never mind the quality; after all, it is a scan.
Thanks for sharing this image of a phenomenon one cannot see as a matter of routine.
The note is very helpful here.
Ram

  • Great 
  • Adanac Gold Star Critiquer/Gold Note Writer [C: 1273 W: 1 N: 6188] (21378)
  • [2007-03-20 20:33]

Hello James,
Very interesting note and capture James, it looks like a patchwork quilt. Thanks for sharing.
Rick

Hi James
What a interesting phenomena warm and cold temperatures can have on our planet to create such a unique pattern. I've never seen this type of landscape before. Your notes are informative.
TFS Janice
PS I think this effect happens to our roads in Calgary...pot holes everywhere LOL!

  • Great 
  • arfer Gold Star Critiquer [C: 2731 W: 0 N: 0] (0)
  • [2007-03-20 23:56]

Hello James

Great documentation shot of this occurence.I hear reports that the permafrost is actually starting to come out of the ground ,causing real problems for settlements that don't have foundations.The challenges that this new wrinkle of global warming is going to be immense.TFS this is a unique and interesting post.

Rob

I love nature's patterns too, This is especially nice and the greens and pinks and blues are lovely. You are a window on the world.... the WHOLE world! Thanks for sharing it with us.

Evelynn : )

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