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Author Topic: Antarctic Icebergs  (Read 11575 times)

blumenkraft

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Re: Antarctic Icebergs
« Reply #50 on: September 25, 2019, 10:08:07 PM »
New iceberg!

Big claving at Amery!

Further west we might lose A68-A to the ocean this year?

Click to play!
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blumenkraft

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Re: Antarctic Icebergs
« Reply #51 on: October 01, 2019, 09:26:16 AM »
As reported in the Thwaites glacier thread, B22-A has moved a little.

This GIF is showing 21st vs 28th of September.
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crandles

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Re: Antarctic Icebergs
« Reply #52 on: October 01, 2019, 11:13:58 AM »
https://www.bbc.co.uk/news/science-environment-49885450

Quote
The Amery Ice Shelf in Antarctica has just produced its biggest iceberg in more than 50 years.

The calved block covers 1,636 sq km in area - a little smaller than Scotland's Isle of Skye - and is called D28.



Oops better covered at https://forum.arctic-sea-ice.net/index.php/topic,2578.msg560 (The Amery Ice Shelf Thread)

blumenkraft

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Re: Antarctic Icebergs
« Reply #53 on: October 01, 2019, 11:19:08 AM »
Belongs here too, Crandles. :)
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Stephan

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Re: Antarctic Icebergs
« Reply #54 on: October 01, 2019, 11:28:13 AM »
As reported in the Thwaites glacier thread, B22-A has moved a little.

This GIF is showing 21st vs 28th of September.
Thanks blumenkraft for this animation.
Interestingly, most of the floating smaller icebergs move synchronously to B-22-A. But some icebergs, mainly at the western edge are immobile and seem to be grounded. Will they act as barrier to prevent B-22-A from further moving westward?
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charles_oil

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Re: Antarctic Icebergs
« Reply #55 on: October 02, 2019, 10:06:10 AM »

blumenkraft

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Re: Antarctic Icebergs
« Reply #56 on: October 06, 2019, 09:20:07 AM »
Will they act as barrier to prevent B-22-A from further moving westward?

Welcome Stephan :)

I think they are getting crushed if they are in its way. They are so tiny and B-22-A is so huge.
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blumenkraft

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Re: Antarctic Icebergs
« Reply #57 on: October 06, 2019, 09:21:37 AM »
A68-A made quite some way...
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Tor Bejnar

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Re: Antarctic Icebergs
« Reply #58 on: October 23, 2019, 09:06:57 PM »
Again, we have parts of A-68A imaged on two dates both showing in Sentinel-hub Playground.
A-68A moved about 8.2 km in 7 days.  The two triangular icebergs in the 'fast ice' appear to have moved about 8.4 km.  Has the ice island rotated anticlockwise a bit, too?
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blumenkraft

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Re: Antarctic Icebergs
« Reply #59 on: October 23, 2019, 09:31:21 PM »
Yep!
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Stephan

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Re: Antarctic Icebergs
« Reply #60 on: October 27, 2019, 10:58:14 AM »
As reported in the Thwaites glacier thread, B22-A has moved a little.

I analysed the Sentinel pictures from Oct 03 and Oct 26, 2019.
B22-A moved around 300 m in NNW direction. This is a movement of 13m/day.
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Tor Bejnar

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Re: Antarctic Icebergs
« Reply #61 on: October 29, 2019, 03:43:55 PM »
13 m/day for B-22A and 650 m/day for A-68A (e.g., 28 km during recent 43 day period). Sentinel-hup Playground imagery [click to run 2-frame GIF]
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Stephan

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Re: Antarctic Icebergs
« Reply #62 on: October 29, 2019, 07:22:44 PM »
OK Tor, "your" berg is faster than "mine"  ;)
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Tor Bejnar

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Re: Antarctic Icebergs
« Reply #63 on: October 29, 2019, 08:00:10 PM »
Is this where I say "Nana-nana-boo-boo"? ::)  I'll admit to having never heard 'the rest of the taunt' that the link provides.  :-[  We only ever said "Nana-nana-boo-boo" to each other in games of chase when an attempt to catch failed.

But the race is on!  Should we check in every few months?  Are there other contestants?
 :)
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blumenkraft

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Re: Antarctic Icebergs
« Reply #64 on: October 29, 2019, 08:17:42 PM »
Guys, my berg is D-26. At the end, i might win! :P
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grixm

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Re: Antarctic Icebergs
« Reply #65 on: October 30, 2019, 10:48:36 AM »
A68a is on the move. In the last week it has drifted around 10 km NNE.

blumenkraft

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Re: Antarctic Icebergs
« Reply #66 on: November 10, 2019, 05:00:53 PM »
Is it expected for such a huge iceberg to move just as fast as the sea ice surrounding it?

Click to play.
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blumenkraft

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Re: Antarctic Icebergs
« Reply #67 on: November 12, 2019, 07:04:08 PM »
Another fine SAR shot came in today.

This is 07.11. vs. 12.11.
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gerontocrat

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Re: Antarctic Icebergs
« Reply #68 on: November 12, 2019, 08:25:43 PM »
Is it expected for such a huge iceberg to move just as fast as the sea ice surrounding it?

Click to play.
I've forgotten what it's freeboard is. 20 metres? Wind speed at 25 metres always higher than at the surface. 180 metres below the water ? Effect of currents ?

Lots of inertia but once on its way vey slow to stop.
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baking

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Re: Antarctic Icebergs
« Reply #69 on: November 13, 2019, 12:41:14 AM »
It's moving about 88 meters per hour.  It is most likely pulling/pushing the sea ice with it.  If it became grounded, the sea ice might move faster.  But if there is no grounding, there is no reason for it to move slower or faster than the surrounding sea ice except for inertia (or waves in open water.)
« Last Edit: November 13, 2019, 12:50:54 AM by baking »

blumenkraft

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Re: Antarctic Icebergs
« Reply #70 on: November 19, 2019, 04:54:55 PM »
Still having the impression it moves at sea ice speed (ish?). I was Gerontocrat on this one. I expected different outcomes with different forces affecting it. But this assumption might be wrong. There must be one dominant driving force which is ... what?

Anyway, it now moves away from the shallow waters. This is 12. vs. 18. Nov.
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gerontocrat

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Re: Antarctic Icebergs
« Reply #71 on: November 19, 2019, 05:55:27 PM »
Still having the impression it moves at sea ice speed (ish?). I was Gerontocrat on this one. I expected different outcomes with different forces affecting it. But this assumption might be wrong. There must be one dominant driving force which is ... what?

Anyway, it now moves away from the shallow waters. This is 12. vs. 18. Nov.
Helluva big ice-breaker.
"Para a Causa do Povo a Luta Continua!"
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blumenkraft

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Re: Antarctic Icebergs
« Reply #72 on: November 19, 2019, 07:22:03 PM »
Helluva big ice-breaker.

Nah, i would see that in the satellite pictures. ;)
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gerontocrat

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Re: Antarctic Icebergs
« Reply #73 on: November 19, 2019, 07:31:43 PM »
Helluva big ice-breaker.

Nah, i would see that in the satellite pictures. ;)
Stealth technology (if the Klingons can do it, so can we).
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blumenkraft

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Re: Antarctic Icebergs
« Reply #74 on: November 19, 2019, 08:09:20 PM »
Wow, this is uncanny. I just talked about Klingons with a friend.  :o

PS: Not in Klingon though.  ;D
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blumenkraft

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Re: Antarctic Icebergs
« Reply #75 on: November 23, 2019, 05:52:54 PM »
4 beautiful cloud-free days in a row.
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FredBear

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Re: Antarctic Icebergs
« Reply #76 on: November 30, 2019, 12:39:50 AM »
Looking back to the initial post I thought it might be interesting to have a current "fix" on all numbered icebergs so that future movements can be defined more accurately. This might be particularly useful for A23A and B22A which have been grounded for years but move slightly?

 The positions are at 11/29/2019

grixm

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Re: Antarctic Icebergs
« Reply #77 on: December 05, 2019, 08:05:01 PM »
Moved about 20 km since Nov. 23, no signs of slowing down

Stephan

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Re: Antarctic Icebergs
« Reply #78 on: December 05, 2019, 10:41:49 PM »
Are there any bumps or shallow waters on its way NE that would prevent iceberg A-68-A to continue its journey?
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baking

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Re: Antarctic Icebergs
« Reply #79 on: December 06, 2019, 03:50:09 PM »
Are there any bumps or shallow waters on its way NE that would prevent iceberg A-68-A to continue its journey?

Tierra del Fuego?  The Falklands?  A cruise ship?

blumenkraft

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Re: Antarctic Icebergs
« Reply #80 on: December 06, 2019, 04:40:58 PM »
LOL  ;D

Yes, Stephan, there are shallow waters ahead. But i think the ice island is tall enough to not get grounded there but snaking along as it does at the moment. We'll see i guess.



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