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lanevn

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Re: Arctic Image of the Day
« Reply #200 on: February 17, 2014, 08:47:40 PM »
Something in Summit Camp. Sun?

diablobanquisa

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Re: Arctic Image of the Day
« Reply #201 on: February 21, 2014, 01:17:05 AM »
Sun is back (Eureka, Ellesmere Island):


Neven

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Re: Arctic Image of the Day
« Reply #202 on: February 21, 2014, 01:19:13 AM »
Very nice, Diablo!
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Wipneus

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Re: Arctic Image of the Day
« Reply #203 on: February 21, 2014, 09:37:00 AM »
Exit from the Bering Strait (2014-2-6).

In this Landsat 8 image the center the Big and Little Diomede Islands between the mainlands of Siberia and Alaska can be seen. And between Chukchi in the north and Bering Sea in the south.
The international date line separates these islands, giving them the alternative names Tomorrow and Yesterday Islands.

The ice in the Bering sea does not get much better going to the south.

(Click the attached image for the hi-res picture)

Shared Humanity

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Re: Arctic Image of the Day
« Reply #204 on: February 21, 2014, 04:47:45 PM »
Exit from the Bering Strait (2014-2-6).

In this Landsat 8 image the center the Big and Little Diomede Islands between the mainlands of Siberia and Alaska can be seen. And between Chukchi in the north and Bering Sea in the south.
The international date line separates these islands, giving them the alternative names Tomorrow and Yesterday Islands.

The ice in the Bering sea does not get much better going to the south.

(Click the attached image for the hi-res picture)

I would think portions of the Chukchi look similar as there are areas of low concentration showing on CT.

Wipneus

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Re: Arctic Image of the Day
« Reply #205 on: February 24, 2014, 03:15:46 PM »
Wrangel Island on this February 21 Landsat 8 image. Sun elevation is 8.8 degrees, so the image is not that brilliant yet.
North-East is cliffy Herald Island under a few clouds.

East of Wrangel is the Chukchi Sea. I wonder about the brownish color of some of the ice, looks kind of dirty

(click the image for the hi res picture, rescaled to 60m to keep the forum software happy)

Espen

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Re: Arctic Image of the Day
« Reply #206 on: February 24, 2014, 06:29:33 PM »
Wipneus,

I think the color difference is due to difference in ice thickness?
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jdallen

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Re: Arctic Image of the Day
« Reply #207 on: February 24, 2014, 07:27:41 PM »
Wipneus,

I think the color difference is due to difference in ice thickness?

That would be my guess.  I think if we track the images back we would find the darker areas were recently opened leads which have since picked up a skin of new ice.  Considering warmth and the return of sunlight, it may not get much past the pancake stage.
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Yuha

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Re: Arctic Image of the Day
« Reply #208 on: February 27, 2014, 12:49:11 AM »
Spotted this on the Arctic Sea Ice Graphs page.
Obviously a glitch for now, but could it be reality one day?

jdallen

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Re: Arctic Image of the Day
« Reply #209 on: February 27, 2014, 03:36:19 AM »
Spotted this on the Arctic Sea Ice Graphs page.
Obviously a glitch for now, but could it be reality one day?
<laughs> Quite the glitch.

The globe isn't due to get that much warmer for several hundred million years, even with human meddling.  Past about 300MY and the re-merging of continents in "Pangea-ultima", we'll for certain be back to a hothouse - albeit the final one - before the predicted extinction of Prokaryotic life in about 600MY or so, due to increased solar output and CO2 removal from the atmosphere by geologic processes.

Our problems of course, are a lot more immediate, and not as severe, thankfully  ;)

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Pmt111500

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Re: Arctic Image of the Day
« Reply #210 on: February 27, 2014, 07:24:40 AM »
 Hah, instant mega-PETM ::) , the values for tropics are too high for much complex life to exist. Maybe some annual plants can live there, spending these too hot days as seeds. If that comes to pass, all of the tropics is turned to carbon sinks and the only way to travel between hemispheres would be aerial or heavily airconditioned. One could assume this wouldn't effect the currents of air and water, but one would be wrong. Can't say if that's possible.
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jdallen

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Re: Arctic Image of the Day
« Reply #211 on: February 27, 2014, 09:03:38 AM »
Hah, instant mega-PETM ::) , the values for tropics are too high for much complex life to exist. Maybe some annual plants can live there, spending these too hot days as seeds. If that comes to pass, all of the tropics is turned to carbon sinks and the only way to travel between hemispheres would be aerial or heavily airconditioned. One could assume this wouldn't effect the currents of air and water, but one would be wrong. Can't say if that's possible.

Given time, plants might adapt. Extremeophiles definitely would, because there would be areas that would get WET.  Insects, possibly.  Vertebrates? Unlikely unless they were nocturnal.  Some critters would survive at higher altitudes.  Overall though, bad news.
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Wipneus

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Re: Arctic Image of the Day
« Reply #212 on: February 27, 2014, 09:24:43 AM »
Barrow, north Alaska, February 26. In this Landsat 8 image, the little town is clearly visible with its east-west air strip, under a low sun (elevation 10.6 degrees).

The Chukchi Sea is full of slabs of broken ice. Probably quite thin due to the relatively high temperatures this winter.

(do click the image for a hi-res experience)

Polynya88

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Re: Arctic Image of the Day
« Reply #213 on: February 27, 2014, 05:00:16 PM »
The temperatures in the Beaufort Sea have not been overly warm this year. Attached is a chunk of hi-res. radar from N of Point Barrow showing some of the extensive area of Second-year ice that was created along the Alaskan coast this fall - large areas of First-year ice did not melt out due to the cold summer. These now second-year floes (technically Old Ice) are small in diam, but at least 25% thicker than the FY ice.
The attached ice chart shows VAST area of predominantly second-year ice (orange in the map) that was present at the end of melt season - a low melt season, with resulting low water temps and rapid ice growth.

jdallen

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Re: Arctic Image of the Day
« Reply #214 on: February 27, 2014, 11:36:31 PM »
The temperatures in the Beaufort Sea have not been overly warm this year.

I respectfully beg to differ with you here... They've been 5-6C above normal, for the last 3 months...

http://www.esrl.noaa.gov/psd/map/images/rnl/sfctmpmer_90b.rnl.html

... and the lions share of that is inflow heat from the North Pacific rather than radiative loss from the ocean.  Given the end of melt season conditions last fall, with "average" refreeze season conditions, the ice would be in far better shape than it is currently.

Yes, there is a lot more 2nd year ice than this time in 2013.  It is not a solid pack, and is whip-stitched together with poorer-than-average (by 50-60CM thinner, I'd wager) FYI which will not stand up well to the return of insolation next month.

We shall see in another 6 weeks.
« Last Edit: February 27, 2014, 11:46:15 PM by jdallen »
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Apocalypse4Real

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Re: Arctic Image of the Day
« Reply #215 on: February 28, 2014, 03:07:14 AM »
The ice across much of the Alaskan and Siberian coastal areas looks like it has already hit an ice machine. This is not the past pack ice.

Neven

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Re: Arctic Image of the Day
« Reply #216 on: February 28, 2014, 05:42:58 AM »
Barrow, north Alaska, February 26. In this Landsat 8 image, the little town is clearly visible with its east-west air strip, under a low sun (elevation 10.6 degrees).

The Chukchi Sea is full of slabs of broken ice. Probably quite thin due to the relatively high temperatures this winter.

(do click the image for a hi-res experience)

Wow, that's pretty amazing. Too bad they're no longer doing the Barrow break-up...
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Vergent

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Re: Arctic Image of the Day
« Reply #217 on: February 28, 2014, 07:14:30 AM »
looks like they need a Zamboni.

Wipneus

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Re: Arctic Image of the Day
« Reply #218 on: March 04, 2014, 06:37:58 PM »
North Baffin Bay, near Ellesmere island, first Landsat 8 Image here of the summer season (sun elevation 6.8 degrees). Almost teardrop shaped stripes of ice sludge in the open water between the sea ice floats.

Upper left in the land-fast ice some bigger icebergs (the largest has a side of about 1.5 km) are stuck, probably remnants of the PII-2012 iceberg. Smaller icebergs (less than 100m) can be seen all over the place.

(do click the picture for the hi-res image)

   

Espen

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Re: Arctic Image of the Day
« Reply #219 on: March 04, 2014, 06:42:36 PM »
Wipneus,
It more art than ice :)
Have a ice day!

Espen

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Re: Arctic Image of the Day
« Reply #220 on: March 04, 2014, 09:51:05 PM »
Wipneus,

In what (high) resolution can you supply the image?
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Wipneus

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Re: Arctic Image of the Day
« Reply #221 on: March 05, 2014, 06:11:35 AM »
It is 15m as indicated in the caption (processed as described in the developer corner thread).
Full image (@18062x18122pixels) is 655 MBytes. Here is a reduced resolution version:

wili

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Re: Arctic Image of the Day
« Reply #222 on: March 05, 2014, 09:12:28 AM »
http://earth.nullschool.net/#current/wind/surface/level/orthographic=-33.96,42.35,290

Notice that winds are coming north from the tropics all the way up into the Arctic right now. What effect is this likely to have on sea ice in that region? Wasn't this a pattern that someone predicted a few days back as hitting about now? Was that Wipneus or Werther? Or someone else?
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werther

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Re: Arctic Image of the Day
« Reply #223 on: March 05, 2014, 11:34:32 AM »
Morning Wili,

It is what you could see coming even on the 26 Feb prognosis by ECMWF, this however, recalculated on 2 Mar:



As you saw on Nullschool, it is actually panning out now. Maybe a tad repositioned, but nevertheless.
Interesting to see SIE and MODIS in the next couple of days.

Later on next week AO is turning positive, low level Low near the Pole, N winds around Svalbard again. Getting colder over the Pole also, pulling it all back out of Eurasia. So expect SIE to hover against a max in the next 10 days.

Wipneus

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Re: Arctic Image of the Day
« Reply #224 on: March 07, 2014, 02:54:49 PM »
Idunno asked about this on the ASI blog.
First Landsat 8 image from row 4, latitude high enough for the Zachariae ice stream. But this is Laptev, open water that has refrozen. See also this post

The island on the left is Bolshevic Island, most southern of the Severnaya Zemlya islands. The strait between Bolshevic and the main land is part of the North East Passage.

(click attached image for best resolution)

Jim Hunt

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Re: Arctic Image of the Day
« Reply #225 on: March 07, 2014, 04:22:38 PM »
This morning's view from the Svalbard surfcam:



Reality is merely an illusion, albeit a very persistent one - Albert Einstein

Neven

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Re: Arctic Image of the Day
« Reply #226 on: March 07, 2014, 10:02:40 PM »
Is that a polar bear in the lower right corner?
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Jim Hunt

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Re: Arctic Image of the Day
« Reply #227 on: March 07, 2014, 10:14:24 PM »
Is that a polar bear in the lower right corner?

After close inspection of the original I don't think so Neven. I suspect the polar bears had all disappeared over the horizon on their jetskis, looking for some seals.
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Shared Humanity

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Re: Arctic Image of the Day
« Reply #228 on: March 08, 2014, 10:25:53 PM »
Is that a polar bear in the lower right corner?

After close inspection of the original I don't think so Neven. I suspect the polar bears had all disappeared over the horizon on their jetskis, looking for some seals.

Funny  ;D and sad.  :'(

Wipneus

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Re: Arctic Image of the Day
« Reply #229 on: March 17, 2014, 12:00:45 PM »
Landsat 8 image of south-west part of Svalbard. "1" marks the landing strip of Svalbard Airport of Longyearbyen, administrative center of the islands. "2" marks Barentsburg, mostly inhabited by Russians and Ukrainians.

(click that picture for best resolution)
« Last Edit: March 17, 2014, 02:35:05 PM by Wipneus »

werther

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Re: Arctic Image of the Day
« Reply #230 on: March 17, 2014, 01:22:30 PM »
Well, Wipneus, you don't mean to suggest any relations between people of Russian or Ukranian descent and 'bugged' places?

Wipneus

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Re: Arctic Image of the Day
« Reply #231 on: March 17, 2014, 02:39:54 PM »
Barentsbug -> Barentsburg

What a mistake to make, certainly not intentional.

ChasingIce

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Re: Arctic Image of the Day
« Reply #232 on: March 18, 2014, 12:17:11 AM »
Spotted this on the Arctic Sea Ice Graphs page.
Obviously a glitch for now, but could it be reality one day?

No. 

If it ever was, there wouldn't be anyone to post about it.

adancau

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Re: Arctic Image of the Day
« Reply #233 on: March 18, 2014, 09:09:32 PM »
Barentsburg from across the fjord, Mar 05. No ice at all, had to go all around the fjord. Not normal, according to the guide.

Wipneus

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Re: Arctic Image of the Day
« Reply #234 on: March 24, 2014, 03:51:15 PM »
Fram transport (image source Nasa Worldview-Aqua Modis).

Far on the left the ice is still fasted to Greenland, the ice on the highway moves south at about 23 km/day. I cannot be sure but the ice strings on the right seem to move north.


jdallen

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Re: Arctic Image of the Day
« Reply #235 on: March 24, 2014, 06:27:07 PM »
Fram transport (image source Nasa Worldview-Aqua Modis).

Far on the left the ice is still fasted to Greenland, the ice on the highway moves south at about 23 km/day. I cannot be sure but the ice strings on the right seem to move north.

23KM/day sounds about right. Multiply by width of flow, and we have (holds up thumb and squints) somewhere between 5000-10000 Km2/day of older ice exiting the central arctic.  Doesn't sound like much, but when you consider the end of season area and age, it looks more significant.
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TerryM

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Re: Arctic Image of the Day
« Reply #236 on: March 24, 2014, 08:08:09 PM »
Wipneus


In the past I've attributed the patterns shown particularly on the image from the 23d as evidence of the katabatic winds called piteraq in Greenland. They tend to follow deep canyons and can dislodge fast ice from the coast.


Terry

Neven

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Re: Arctic Image of the Day
« Reply #237 on: March 30, 2014, 10:03:54 AM »
Commenter icefest made this image showing NH snow cover:

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Wipneus

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Re: Arctic Image of the Day
« Reply #238 on: April 01, 2014, 10:20:53 AM »
Landsat 8 image of the sea north of Svalbard. The gap of open water has not been so narrow for a while, but the ice pack looks really dispersed. Some ice streamers in between, suggest a current east-west while the clouds are coming from the north.

(click that picture for the full size image)

jdallen

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Re: Arctic Image of the Day
« Reply #239 on: April 03, 2014, 09:30:02 AM »
« Last Edit: April 03, 2014, 09:43:43 AM by jdallen »
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Wipneus

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Re: Arctic Image of the Day
« Reply #240 on: April 17, 2014, 09:19:19 AM »
Off topic, as this image is Antarctica, but this is to pretty/important to ignore. First images of Sentinel-1A is released, among this one:

Quote
Acquired on 13 April 2014 at 23:57 GMT (14 April at 01:57 CEST) by Sentinel-1A, this image shows a transect over the northern part of the Antarctica Peninsula. It was acquired in the satellite’s ‘strip map’ mode with a swath width of 80 km and in dual polarisation. The colours indicate how the land, ice and water reflect the radar signal differently.



http://www.esa.int/spaceinimages/Images/2014/04/Antarctica_Peninsula_from_Sentinel-1A

icefest

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Re: Arctic Image of the Day
« Reply #241 on: April 17, 2014, 10:40:28 AM »
 Wipneus, can you help interpret the image?

I can see glaciers in the bottom of the image, flowing into what must be sea ice in the bottom right.
Does that mean that the matte dark area immediately above is an ice cap?
Open other end.

Wipneus

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Re: Arctic Image of the Day
« Reply #242 on: April 17, 2014, 11:36:24 AM »
I have not found it yet icefest! Somewhere else I did read that in Sentinel radar images, water is dark, but here the glaciers seem to show otherwise.

pikaia

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Re: Arctic Image of the Day
« Reply #243 on: April 17, 2014, 11:59:45 AM »
If I understand it correctly, the brightness of the image indicates how much of the radar is reflected back to the satellite, ie how smooth it is. Where the surface is smooth most of the signal will be reflected to the side, giving a dark image; where it is rough some of the signal will be scattered back to the satellite. Where the image is dark it could be due to calm water or it could be due to smooth ice.

icefest

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Re: Arctic Image of the Day
« Reply #244 on: April 17, 2014, 12:21:10 PM »
Here is my interpretation.

This is mostly based upon the direction of flow of the glaciers (purple with arrows pointing to calving front).

Open other end.

icefest

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Re: Arctic Image of the Day
« Reply #245 on: April 17, 2014, 12:28:38 PM »
Sorry for double-posting.

I found the section of antarctic peninsula where the image (?) was taken.

Open other end.

Pmt111500

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Re: Arctic Image of the Day
« Reply #246 on: April 17, 2014, 12:37:34 PM »
to get a more comfortable look on this, rotate 90 clockwise and squeeze height of the image...

I did some more adjusting (not optimized) (cut some blue, inverted part of the brightness range, adjusting contrast etc.)

Estimating from the map the resolution would seem to be ~150m/px, but of course there maybe even more detailed channels than this one, at least the height looks like being more accurate.

umm, looking at Lance/Modis images of the area, the area on right in the image might indeed be open sea, my adjustmets are probably off somewhat... happens though every now and then when not knowing what's been measured.

squeezing the image further gives more realistic height differences, but I've already lost too much detail for this to be good. great if this can see through clouds which are a major PITA in images from orbit.
« Last Edit: April 17, 2014, 04:09:57 PM by Pmt111500 »
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Espen

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Re: Arctic Image of the Day
« Reply #247 on: April 18, 2014, 05:20:24 PM »
Remarkable sea ice free conditions along the Okhostk Coast / Sea:
Have a ice day!

pikaia

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Re: Arctic Image of the Day
« Reply #248 on: April 20, 2014, 09:59:56 AM »


Another image of the Eyjafjallajökull volcano, from NASA's Astronomical Picture of the Day. 

http://apod.nasa.gov/apod/astropix.html





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Re: Arctic Image of the Day
« Reply #249 on: April 20, 2014, 01:58:59 PM »
Beautiful photo. I love having images of the awesome power of nature put me in my place.