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Messages - bairgon

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Antarctica / Re: PIG has calved
« on: February 08, 2020, 12:07:27 PM »
Looks to me as if R3 has widened. This is the 4th vs. the 6th.

What's very evident in this gif is the difference in movement between the front of the proto iceberg vs the crack to the main glacier. It is swinging out quite a lot.

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Arctic sea ice / Re: The 2019 melting season
« on: July 05, 2019, 10:47:30 PM »
It's blowing from the Atlantic through Baffin and the CAA. It's going against the current through Nares and exiting into the Lincoln Sea at 20 knots +, bringing some warm air with it.

Certainly is. The Parry Channel has started to break up, but was torched today:

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Greenland and Arctic Circle / Re: The Nares Strait thread
« on: June 11, 2019, 11:23:17 PM »
Further to the Kane Basin fast ice disintegrating, there are several grounded icebergs

Thanks for the reminder, Tor - had almost forgotten about that bit of research I did! Have been following this thread with interest this year.

4
Greenland and Arctic Circle / Re: The Nares Strait thread
« on: April 27, 2019, 09:18:38 PM »
Looks like a big floe has blocked the channel. I wonder how long this will last.

Click to animate.

5
Antarctica / Re: PIG has calved
« on: February 07, 2019, 09:17:12 AM »
   .   .   and another spray of ice from the SE corner of the glacier front on 2019-02-06   .   . (top left of image)

That appears to be a new calving with some bergs, but a lot of brash ice. See https://apps.sentinel-hub.com/sentinel-playground/?source=S2&lat=-74.93585300426079&lng=-100.777587890625&zoom=10&preset=CUSTOM&layers=B01,B02,B03&maxcc=76&gain=1.0&gamma=1.0&time=2018-08-01%7C2019-02-06&atmFilter=&showDates=false&evalscript=cmV0dXJuIFtCOEEqMSxCMDMqMSxCMDIqMV0%3D

Edit: Checking that URL shows an image for 6th Feb and I can't seem to get to 7th of Feb now. But I definitely saw it earlier today - as per the screen shot below.

6
Antarctica / Re: PIG has calved
« on: February 04, 2019, 01:26:09 PM »
Pine Island Glacier: 18 months of flow and calving
https://adrianluckman.wordpress.com/2019/01/25/


My best estimate of flow rate from this video, picking a feature and seeing how far it moved on my screen vs the scale is that flow is 4.5 km per year, which exceeds recently reported flow rates of "up to 4000m per year" e.g. http://www.antarcticglaciers.org/glaciers-and-climate/shrinking-ice-shelves/pine-island-glacier/

Since the recent calving there is visible movement on Worldview in a month. Using Sentinel, comparing the images from 28/12/2018 and 31/01/2019 it appears the rate is around 4.6 km per year (430m in 34 days). So it is maintaining the faster rate.

Resolution on Worldview is too low to be accurate.

7
Arctic sea ice / Re: The 2018 melting season
« on: August 15, 2018, 12:12:40 PM »
I've tried a different exercise with the Lincoln sea ice.

I chose a floe visible in a Sentinel image, and followed it backwards (and forwards - this took a little time to prepare) in time. The animation below shows images rotated and matched.

The floe is currently about 20km north of the fast ice breaking out of the bay to the south of the Lincoln Sea.

The images were captured at the 300m scale and the floe is about 2km x 2km.

It seems that it suffered a lot of fracturing early on, but more recently has held its shape very consistently.

8
Arctic sea ice / Re: The 2018 melting season
« on: July 01, 2018, 10:10:44 AM »
As pointed out earlier in this thread, Nares is starting to show export from Lincoln again. See more in the Nares Strait thread:

The beginning of the end of the Kane Basin bridge.  DMI's Sentinel-1 today

Parry channel is also opening up. Yesterday's Worldview image shows a large crack near Resolute.

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Greenland and Arctic Circle / Re: The Nares Strait thread
« on: June 29, 2018, 11:55:21 PM »
The Lincoln sea ice is already funnelling into the gap left further up the channel. With the collapse of the arch this should continue.

Click to animate.

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