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Author Topic: Antarctic Icebergs  (Read 23965 times)

baking

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Re: Antarctic Icebergs
« Reply #250 on: March 06, 2020, 04:52:26 PM »
https://earthsky.org/earth/iceberg-b15z-antarctica-ross-ice-shelf

B-15 through B-18 broke off from the Ross Ice Shelf in 2000.  B-15 went more than half-way around Antarctica (all the way around East Antarctica) before exiting the Wendell Sea near the Antarctic Peninsula.

blumenkraft

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Re: Antarctic Icebergs
« Reply #251 on: March 06, 2020, 05:40:28 PM »
A68A update.
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Stephan

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Re: Antarctic Icebergs
« Reply #252 on: March 06, 2020, 10:49:53 PM »
B-15 through B-18 broke off from the Ross Ice Shelf in 2000.  B-15 went more than half-way around Antarctica (all the way around East Antarctica) before exiting the Wendell Sea near the Antarctic Peninsula.

Thank you baking.
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blumenkraft

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Re: Antarctic Icebergs
« Reply #253 on: March 09, 2020, 09:40:02 PM »
A68A update.

If it was bumping against this underwater mountain, we should see some debris surrounding the iceburg. There is no debris. I would assume a current has it in its fangs.
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baking

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Re: Antarctic Icebergs
« Reply #254 on: March 10, 2020, 05:54:47 AM »
There is no debris.
There has been a lot of debris lately.  The whole sea around it, especially down current, has been littered with small icebergs, too numerous to count.  There were a couple of slightly large ones obviously recently calved a few days ago.  I think the most likely explanation is that it is getting caught in stronger currents and is very slowly disintegrating and there is no sign that it is concentrated in any one location.

blumenkraft

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Re: Antarctic Icebergs
« Reply #255 on: March 13, 2020, 04:22:06 PM »
Agreed, Baking! Once in a while you can see some calvings, but they are mini and there is no apparent pattern.

Here is the new update movie.
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Stephan

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Re: Antarctic Icebergs
« Reply #256 on: March 17, 2020, 10:29:37 PM »
As a follow-up to my reply #140 I used the opportunity to analyse the movement of my "pet iceberg" B-22 northwest of Thwaites Ice Tongue.

I chose five different corners (see picture) and looked at the changes of their positions between Jan 22 and March 15, 2020:

A = 3.5 km, N direction of movement
B = 3.5 km, NE direction of movement
C = 1.1 km, ESE direction of movement
D = 1.7 km, WNW direction of movement
E = 2.0 km, NNW direction of movement

This implies a general N movement with a clockwise turn around a centre close to point C. The highest rates are equivalent to an averaged daily movement of 60-65 m.
In the detailed analysis I found some very minor calvings off of the edge from the western side of B-22.

See attached picture.
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blumenkraft

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Re: Antarctic Icebergs
« Reply #257 on: March 20, 2020, 06:34:20 PM »
A68A drift update.
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blumenkraft

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Re: Antarctic Icebergs
« Reply #258 on: March 25, 2020, 02:53:14 PM »
A68A drift update.
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blumenkraft

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Re: Antarctic Icebergs
« Reply #259 on: March 25, 2020, 02:59:24 PM »
There was a calving in the north-west facing side. Not a big one, but way bigger than recent ones.
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oren

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Re: Antarctic Icebergs
« Reply #260 on: March 26, 2020, 04:35:51 AM »
Thanks for these updates blumenkraft.

FredBear

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Re: Antarctic Icebergs
« Reply #261 on: March 26, 2020, 06:11:53 AM »
A68A still drifting northwards, notice the sea ice (the "goodbye waves") drifting up to the south-east edge now.
« Last Edit: March 26, 2020, 06:23:25 AM by FredBear »

blumenkraft

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Re: Antarctic Icebergs
« Reply #262 on: March 26, 2020, 07:52:42 AM »
Very welcome, Oren. :)

'Goodbye wave' is nicely said, Fred. I like that.
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blumenkraft

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Re: Antarctic Icebergs
« Reply #263 on: April 02, 2020, 05:48:25 PM »
Annamaria Luongo
@annamaria_84 on Twitter

Quote
The drift of A68 #iceberg, #Antarctica  🇦🇶 continues.
Images acquired by #Sentinel3  🇪🇺🛰️between December 2019 - March2020

Link >> https://twitter.com/annamaria_84/status/1244749026416885760

GIF at link.

I uploaded a mirror here >> https://imgur.com/z8UozKs
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Tor Bejnar

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Re: Antarctic Icebergs
« Reply #264 on: April 02, 2020, 09:54:48 PM »
That GIF is so cool!  Who says an ice island cannot turn on a dime (that's the US's smallest coin, worth ten cents [a 1¢ coin, usually called a 'penny', and a 5¢ 'nickel' are physically larger]).
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FredBear

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Re: Antarctic Icebergs
« Reply #265 on: April 05, 2020, 02:42:42 PM »

The positions given for a couple of moving icebergs of current interest:-
Locations @ 02/28/2020:-        ->        @04/03/2020
A68A        62°37'S    53°14'W.  ->         61°17'S    50°34'W
D28          67°18'S    72°12'E.   ->        67°01'S    74°04'E. (This is marked as grounded!)

From:-
https://www.natice.noaa.gov/pub/icebergs/Iceberg_Tabular.pdf

Tealight

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Re: Antarctic Icebergs
« Reply #266 on: April 06, 2020, 02:50:08 AM »
Ever since A68A left the Antarctic Peninsula behind it moved along the 0C line and with a common North-West wind it gets 3-5C warm. This air is also very humid, more typical to temperate regions than polar air.

The iceberg might never experience a freezing winter again. 50km further North the water is +1C and 250km North it is +4C. At a speed of 30-40km/week it doesn't take to long to get there. All depends on the direction it takes.

The gif is 3 days out for the currently most northern point of the iceberg at 60.5S ,50W.

blumenkraft

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Re: Antarctic Icebergs
« Reply #267 on: April 06, 2020, 07:38:48 AM »
Hey, Tealight! Nice to see you around! :)
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blumenkraft

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Re: Antarctic Icebergs
« Reply #268 on: April 07, 2020, 04:50:19 PM »
Who says an ice island cannot turn on a dime.

It did it again! A68A update.

(GIF showing movement from 25.03 to today)
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