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jdallen

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Re: Arctic Image of the Day
« Reply #500 on: June 16, 2015, 03:11:25 AM »
Quote
Here's what's currently being counted as "extent" in the North Baffin:

Below are a couple of fog-lifts. Not rocket science to do before measurement.
Thank you for emphatically emphasizing my point, A-Team.

I expect Baffin will shortly be contributing to a rapid plunge in extent.
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solartim27

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Re: Arctic Image of the Day
« Reply #501 on: June 17, 2015, 01:20:29 AM »
H stands for ? ( besides smoke )
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Nick_Naylor

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Re: Arctic Image of the Day
« Reply #502 on: June 17, 2015, 02:15:49 AM »
Looking at this image from the day after tomorrow, it seems the permafrost is starting to tell us something  :o

epiphyte

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Re: Arctic Image of the Day
« Reply #503 on: June 17, 2015, 07:00:34 AM »
Looking at this image from the day after tomorrow, it seems the permafrost is starting to tell us something  :o

Wasn't "The Day After Tomorrow" the one which had global warming desalinating the North Atlantic, thereby disrupting the gulf-stream and suddenly triggering a new ice age, which showed it was serious by instantly popsicle-izing the Whitehouse, leading to the least credible aspect of the movie... the environmentalist epiphany of the decidedly Cheney-esque erstwhile vice-president?

In the real world - if that's what the permafrost is really saying, then Exxon, Shell & BP are probably fighting over who gets to frack the methane out of it as we speak ;)

Wipneus

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Re: Arctic Image of the Day
« Reply #504 on: June 19, 2015, 07:59:14 PM »
Detailed image of a frozen lead, and now melting in the East Siberian Sea, as discussed in the "home brew" thread.

Neven

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Re: Arctic Image of the Day
« Reply #505 on: June 19, 2015, 11:13:56 PM »
Detailed image of a frozen lead, and now melting in the East Siberian Sea, as discussed in the "home brew" thread.

Okay, wipneus, admit it: you took a picture of broken safety glass with a really good camera.  ;) ;D
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Juan C. García

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Re: Arctic Image of the Day
« Reply #506 on: June 20, 2015, 11:07:18 PM »
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.

solartim27

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Re: Arctic Image of the Day
« Reply #507 on: June 23, 2015, 02:04:16 AM »
Time to clean the satellite?
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plinius

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Re: Arctic Image of the Day
« Reply #508 on: June 24, 2015, 04:04:59 PM »
Barrow Sea-Ice break-up happening right now.
A bit surprising that it survived so long - there was some luck though with ice being pushed onto the coastal ice ridges for several days (and currently bearing 50F air temperature...). Despite that, quite early for a break-up in Barrow, normally this is in the first or second July week.
Video:


And Radar:

epiphyte

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Re: Arctic Image of the Day
« Reply #509 on: June 24, 2015, 05:15:13 PM »
Time to clean the satellite?

I've seen that on a number of images, all along roughly that line of latitude, on different days.... At a guess  they are blind spots caused by something blocking the outgoing signal to those locations?  E.g. perhaps the mount of an antenna which needs to be oriented in a conflicting direction, in order to maintain communication,  at the time that the SAR array needs to be projecting energy at those spots?

nukefix

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Re: Arctic Image of the Day
« Reply #510 on: June 25, 2015, 05:29:42 PM »
Time to clean the satellite?
I've seen that on a number of images, all along roughly that line of latitude, on different days.... At a guess  they are blind spots caused by something blocking the outgoing signal to those locations?  E.g. perhaps the mount of an antenna which needs to be oriented in a conflicting direction, in order to maintain communication,  at the time that the SAR array needs to be projecting energy at those spots?
Those holes must be indicative of something going awry in the post-processing of the images by Polarview as they do not look like any known types of SAR image artifacts.

solartim27

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Re: Arctic Image of the Day
« Reply #511 on: June 27, 2015, 02:14:59 AM »
Any thoughts on this dark region?  I don't think it is melt ponds covered by snow as discussed above on June 11.  It is a broad region that gets larger and darker over several days.  My hunch would be smoke deposition, but could it be fresh, or last years melting through? Lat / Long around 83 / 138
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Jim Hunt

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Re: Arctic Image of the Day
« Reply #512 on: June 27, 2015, 02:53:20 AM »
My hunch would be smoke deposition

I wouldn't be sure of that in the CAB, but there's plenty over North America just at the moment:
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jdallen

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Re: Arctic Image of the Day
« Reply #513 on: June 27, 2015, 09:01:02 AM »
More smoke over the Beaufort.
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Laurent

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Re: Arctic Image of the Day
« Reply #514 on: June 27, 2015, 11:28:37 AM »
Solartime27
I think it is Algual bloom, it was initiated in Jun 11 when the ice did broke momentarily.
http://1.usa.gov/1Hm6Iab

Nick_Naylor

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Re: Arctic Image of the Day
« Reply #515 on: June 27, 2015, 05:38:20 PM »
I have noticed that the Arctic seems noticeably darker over the entire expanse than the last couple of years, so I thought I'd try to make that more obvious by doing the following:
- Take the seven day period of June 20-26 in each of the 2013, 2014 and 2015 seasons.
- Average the seven images from each year together to smooth out effect of weather.
- "Dark-blend" the seven images from each year to eliminate clouds as far as possible
- Boost the contrast identically for each year's image to make the differences easier to see.

Here's what the result looks like. 2015 is clearly less reflective than either of the last two years. This is confirmed by histogram analysis, which shows a significantly lower mode than 2013 or 2014.
I didn't do the same for 2012 because the original images for that year don't look like they were processed consistently.

Edit: I should explain what the darken blending mode in Photoshop does for those who might be unfamiliar with it. Suppose I have two similar images stacked on top of each other. Normally, the top layer would completely obscure the bottom layer. However, if I set the mode to "Darken", then each pixel in the visible image would reflect only the darker pixel from image A and image B, regardless of which is on top. So if image A and B were identical except for a cloud that has moved within the frame, the cloud would magically disappear. By the same token, if image A is white ice with the exception of a crack that has moved to a new location in image B, the crack would appear in both locations in the final image. So the "darken" mode exaggerates the degree of fragmentation of mobile ice under clear skies.
« Last Edit: June 27, 2015, 09:14:28 PM by Nick_Naylor »

Neven

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Re: Arctic Image of the Day
« Reply #516 on: June 27, 2015, 11:21:58 PM »
Very nice image, Nick! Definitely an Arctic image of the day. But maybe you can copy your comment and post it in the 2015 Melting Season thread?

And I might ask you to do another one of those in July, as I'm going to focus mainly on whether 2015 is going to beat 2013 and 2014. Very smart and elegant method.
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Nick_Naylor

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Re: Arctic Image of the Day
« Reply #517 on: June 28, 2015, 01:07:32 AM »
Very nice image, Nick! Definitely an Arctic image of the day. But maybe you can copy your comment and post it in the 2015 Melting Season thread?

And I might ask you to do another one of those in July, as I'm going to focus mainly on whether 2015 is going to beat 2013 and 2014. Very smart and elegant method.

Thanks Neven. I copied this message to the 2015 Melting Season thread & I will do a similar analysis from July 20-26 when available.

Vergent

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Re: Arctic Image of the Day
« Reply #518 on: June 28, 2015, 05:35:36 PM »


North pole cam, 87N. Melt ponds have formed and albedo has dropped. For comparison, here is July 1, 2012:



Verg

edit: sp
« Last Edit: June 28, 2015, 06:50:54 PM by Vergent »

Peter Ellis

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Re: Arctic Image of the Day
« Reply #519 on: June 28, 2015, 10:54:13 PM »
Interesting to see that the Pole is slightly ahead of 2012 in forming melt ponds.

However, it's important to note that this year started with only 2cm of snow (recorded at time of buoy placement), whereas 2012 started with 30cm, and was down to about 10cm by the start of July - i.e. a loss of 20cm of snow. So another interpretation of that data would say that up to the end of june / start of July, 2012 had seen 10x as much melting as 2015.

In other words, while 2015 started the year with a heck of a head start, most of that has now been lost, and we will need a drastic change in weather conditions to see anything remotely approaching 2012.

jdallen

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Re: Arctic Image of the Day
« Reply #520 on: June 28, 2015, 11:01:55 PM »
Interesting to see that the Pole is slightly ahead of 2012 in forming melt ponds.

However, it's important to note that this year started with only 2cm of snow (recorded at time of buoy placement), whereas 2012 started with 30cm, and was down to about 10cm by the start of July - i.e. a loss of 20cm of snow. So another interpretation of that data would say that up to the end of june / start of July, 2012 had seen 10x as much melting as 2015.

In other words, while 2015 started the year with a heck of a head start, most of that has now been lost, and we will need a drastic change in weather conditions to see anything remotely approaching 2012.

Agree - 2015 had a head start - lowest Maxima on record.
Overstated - that 2012 had 10x as much melt as 2015
Not certain - 2015 will need a drastic weather change to reach 2012. 

In short, I think my point here, is I don't think 2015 is in better shape right now than 2012 was.  Given approximately equivalent weather, or even weather similar to what we have right now, I think 2015 is going to make a serious run at 2012.   I think it will require far *better* weather for ice preservation to prevent 2015 from displacing one of the lowest three years on record.  I still think we have an even chance to reach or pass 2012.
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Espen

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Re: Arctic Image of the Day
« Reply #521 on: July 01, 2015, 08:40:10 PM »
Out of context but with a Whole Lotta Love ;):

Have a ice day!

jdallen

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Re: Arctic Image of the Day
« Reply #522 on: July 03, 2015, 04:11:08 AM »
Everyone, I give you the Siberian coast.

Fast ice from the Chukchi to the Kara is shattering or covered with extensive, significant low-albedo melt ponds, from the coast to several hundred KM from the coast.

This ice is now in the full grip of serious melt, whether area and extent numbers demonstrate it, or not.
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seaicesailor

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Re: Arctic Image of the Day
« Reply #523 on: July 03, 2015, 06:59:49 AM »
Everyone, I give you the Siberian coast.

Fast ice from the Chukchi to the Kara is shattering or covered with extensive, significant low-albedo melt ponds, from the coast to several hundred KM from the coast.

This ice is now in the full grip of serious melt, whether area and extent numbers demonstrate it, or not.

The edge is passing Wrangler island very fast. Which reminds me of certain idiot foreseeing it wouldn't get even close.

helorime

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Re: Arctic Image of the Day
« Reply #524 on: July 03, 2015, 04:01:33 PM »
Look at what has happened suddenly at obuoy 9 as it has gotten to the northeast tip of Greenland!
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jdallen

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Re: Arctic Image of the Day
« Reply #525 on: July 04, 2015, 08:36:12 PM »
Nares Strait, July 3rd.  Clear skies, melt ponds and fracturing ice.
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Re: Arctic Image of the Day
« Reply #526 on: July 05, 2015, 04:55:44 AM »
Check out the feature between about 78 and 82 degrees N. and 150E and 165E,  in the daily AMSR2 concentration map.  It seems to be remarkably intact.  Maybe from a major fracturing event in the Beaufort?  There seems to perhaps be an interference pattern of Two different fracturing events to the SW of the main feature. 

A-Team

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Re: Arctic Image of the Day
« Reply #527 on: July 06, 2015, 01:27:07 AM »
The preview Landsat image provided by EarthExplorer -- which gets used every day somewhere on these forums -- is formed from bands 7,3,1 used for RGB. That works quite well to produce somewhat natural color on land but not so well on ice. I found bands 5,3,1 work much better because band 5 has much better inherent contrast than band 7.

To make the image below, the bands are loaded into ImageJ2, put in a stack, co-cropped to the region of interest, then enhanced for optimal local contrast (CLAHE menu item) still in 16-bit mode, and finally combined into RGB. The top layer is cut away diagonally twice with the 'free select tool' and 'invert selection' to get the effect. I have not found pan-sharpening with band 8 (eg replacing band 5, up-scaling bands 1 and 3) to be helpful on the color.

Click on the split animation to see the difference at full resolution (30 m) -- it's a remarkable improvement.
« Last Edit: July 06, 2015, 01:34:28 AM by A-Team »

Nightvid Cole

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Re: Arctic Image of the Day
« Reply #528 on: July 06, 2015, 05:32:52 PM »
High Concentration Ice "eagle" (my drawing on CT map):



Nick_Naylor

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Re: Arctic Image of the Day
« Reply #529 on: July 06, 2015, 06:15:26 PM »
Is the eagle welcoming the ice to the endangered species list?

Tor Bejnar

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Re: Arctic Image of the Day
« Reply #530 on: July 06, 2015, 08:00:40 PM »
Is that a hole through its heart or lung?  Or does it 'just miss' this time?
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jdallen

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Re: Arctic Image of the Day
« Reply #531 on: July 07, 2015, 05:32:06 AM »
Eastern Kara sea land fast ice has shattered completely, and is now well on its way to destruction.
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jdallen

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Re: Arctic Image of the Day
« Reply #532 on: July 07, 2015, 05:48:13 AM »
And here we have, the best part of 900,000KM2 of ice which is about to disappear, directly.
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Yuha

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Re: Arctic Image of the Day
« Reply #533 on: July 07, 2015, 10:11:28 AM »
The difference between multi year ice and first year ice is now clearly visible in Beaufort.

slow wing

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Re: Arctic Image of the Day
« Reply #534 on: July 07, 2015, 10:16:53 AM »
Yes, nice image!

gideonlow

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Re: Arctic Image of the Day
« Reply #535 on: July 07, 2015, 10:16:35 PM »
Smoke from the Alaska fires is definitely drifting over a substantial part of the ice now: http://1.usa.gov/1Hci5No

I wonder if enough is making it down to ice-level to offset the reduced insolation with reduced albedo.

EDIT: Image Attached.

Nightvid Cole

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Re: Arctic Image of the Day
« Reply #536 on: July 07, 2015, 10:29:39 PM »
Is the eagle welcoming the ice to the endangered species list?

No, it's leaving the Arctic before the polar bears get too hungry!

Is that a hole through its heart or lung?  Or does it 'just miss' this time?

It's a mark from when it was attacked by an Arctic fox - fortunately it escaped.

 :)

jdallen

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Re: Arctic Image of the Day
« Reply #537 on: July 08, 2015, 07:28:36 AM »
What a difference two weeks makes.
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jdallen

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Re: Arctic Image of the Day
« Reply #538 on: July 09, 2015, 07:32:53 AM »
I apologize for not orienting these images so they are in closer alignment.

However, I offer July 8, 2012 and July 8, 2015 images of the Beaufort, Chukchi and ESS from Banks Island/Straight to the New Siberian Islands.

From the hip, I'd say the 2015 ice is in much worse shape.
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helorime

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Re: Arctic Image of the Day
« Reply #539 on: July 09, 2015, 05:10:59 PM »
Greenland from my favorite buoy this summer, obuoy 9 passing very close to the northeastern tip of the island.

edited for wrong image.
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Espen

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Re: Arctic Image of the Day
« Reply #540 on: July 09, 2015, 10:27:58 PM »
One of many incredible sceneries in Greenland, Skjoldungeelv in Amdrup Højland leading into Danmark Fjord (please click to enlarge):
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Phil.

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Re: Arctic Image of the Day
« Reply #541 on: July 10, 2015, 01:29:32 AM »
Some recent visitors to the buoys!


jdallen

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Re: Arctic Image of the Day
« Reply #542 on: July 11, 2015, 03:11:05 AM »
Surprisingly large areas of open water in the Foxe basin for this time of year.
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Tor Bejnar

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Re: Arctic Image of the Day
« Reply #543 on: July 14, 2015, 03:49:51 AM »
Here is a hunk of ice near Long. 150 W, Lat. 71 N from the Healy.  Most of what I've seen on the ship's cam is much thinner and much higher concentration.
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Re: Arctic Image of the Day
« Reply #544 on: July 14, 2015, 01:41:02 PM »


Pina colada, anyone?

jdallen

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Re: Arctic Image of the Day
« Reply #545 on: July 14, 2015, 05:55:27 PM »


Pina colada, anyone?
*THAT* may be how our extent is increasing/persisting - ice disintegrating into the near slush we're looking at in this image.
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Re: Arctic Image of the Day
« Reply #546 on: July 18, 2015, 08:03:54 PM »
The last remains of sea ice in Sea of Okhotsk:
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Re: Arctic Image of the Day
« Reply #547 on: July 18, 2015, 10:13:45 PM »
Quote
*THAT* may be how our extent is increasing/persisting - ice disintegrating into the near slush we're looking at in this image.

YES......
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jdallen

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Re: Arctic Image of the Day
« Reply #548 on: July 20, 2015, 10:04:09 PM »
Magnificent exposure of the Foxe basin today (2015-07-20)
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Nick_Naylor

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Re: Arctic Image of the Day
« Reply #549 on: July 21, 2015, 06:13:44 PM »
There is no longer any doubt that humans have left our fingerprint on the Arctic ice cap ;D


EOSDIS Worldview July 16
Latitude=85.1-86.44, Long=126-150