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Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #300 on: August 07, 2013, 10:17:03 AM »
Update 20130806.

Extent: -83k7 (+825k vs 2012)
Area: -41k1 (+666k vs 2012)

ESS and Chukchi are taking bad hits, not entirely unexpected.
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                    2.3                   -37.5                    -1.5
               Kara Sea             Barents Sea           Greenland Sea
                    1.9                     0.9                   -12.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -4.7                     0.0                     1.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.5                     5.9                   -31.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -83.7

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                   18.2                     5.8                    -9.0
               Kara Sea             Barents Sea           Greenland Sea
                  -11.2                     0.5                     0.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -3.2                     0.0                    -1.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -4.0                   -21.1                   -16.4
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -41.1


Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #301 on: August 07, 2013, 10:23:37 AM »
ESS and Chukchi are of course region of today.

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Re: Home brew AMSR2 extent & area calculation
« Reply #302 on: August 07, 2013, 10:38:53 AM »
And the color coded concentration map of the region.

While the margins of the ice pack are loosing ice and concentration drops, in the interior purples have appeared where in the past few days the concentration was well below that. I expect this to return when water vapor and liquid water in clouds go down after the cyclone's passage.

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Re: Home brew AMSR2 extent & area calculation
« Reply #303 on: August 07, 2013, 12:33:48 PM »
Couple of tries to overlay AMSR2 images 04082013 and 06082013, no idea what the scale on these would be, but the intention was to identify locations of greatest changes. I don't know how well I succeeded.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #304 on: August 08, 2013, 08:40:12 AM »
Update 20130807.

Extent: -80k3 (+784k vs 2012)
Area: -1k4 (+710k vs 2012)

The extent in the ESS keeps declining big way, now in the company of Beaufort. In the CAB, sea ice area increased, for a real low September minimum it should decline big way by now.
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                    5.0                   -34.2                    -3.6
               Kara Sea             Barents Sea           Greenland Sea
                   -8.5                    -0.4                     1.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.1                     0.0                    -4.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -5.3                   -26.7                    -2.5
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -80.3

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                   42.3                   -36.9                    -6.9
               Kara Sea             Barents Sea           Greenland Sea
                   -5.6                    -0.3                    11.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.1                     0.0                    -3.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.6                     1.3                     7.7
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    -1.4


Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #305 on: August 08, 2013, 08:51:17 AM »
The action is nearly all in Beaufort, Chukchi and ESS, therefore about the same region of the day. What will the cyclone do with the low concentration ice in the CAB?

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Re: Home brew AMSR2 extent & area calculation
« Reply #306 on: August 08, 2013, 09:00:51 AM »
And the color coded concentration map of the same. Compare the interior of the ice, lots of yesterday's purples appear now (again) as low concentration ice.

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Re: Home brew AMSR2 extent & area calculation
« Reply #307 on: August 08, 2013, 09:11:46 AM »
Extra, the "stubborn" ice in the Kara Sea that is blocking the North (East) Passage. Slowly the melt is making progress, concentration is dropping and the polynyas are growing.

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Re: Home brew AMSR2 extent & area calculation
« Reply #308 on: August 09, 2013, 08:23:43 AM »
Update 20130808.

Extent: -136k4 (+596k vs 2012)
Area: -254k0 (+465k vs 2012)

After some rather dull days, the numbers today show that serious melt figures can still be produced. Huge extent declines in the CAA, ESS and Beaufort. Area declines are even bigger, with the CAB taking the largest bite. 
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -10.1                   -32.3                    -4.7
               Kara Sea             Barents Sea           Greenland Sea
                   -3.3                     0.5                    -6.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -2.8                     0.0                    -9.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -52.0                   -21.3                     5.2
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                  -136.4

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -72.8                   -48.1                     1.6
               Kara Sea             Barents Sea           Greenland Sea
                    1.0                     0.4                   -14.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -5.5                     0.0                    -5.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -70.6                   -39.3                    -0.3
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                  -254.0


Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #309 on: August 09, 2013, 08:44:53 AM »
Region of the day is the Canadian Archipelago. The NW passage looks now almost passable by the southern route, it is worked on har it seems. Further some fjords in the Ellesmere are showing sudden melting, this could well be (it is even likely) and artifact. Contamination from the nearby land on the microwave brightness makes the measurement uncertain.
The PII iceberg in the Nares Strait can be seen as a bright spot in the low concentration ice field.

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Re: Home brew AMSR2 extent & area calculation
« Reply #310 on: August 09, 2013, 08:49:46 AM »
Color coded concentration map of the same region.

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Re: Home brew AMSR2 extent & area calculation
« Reply #311 on: August 09, 2013, 08:58:44 AM »
As extra, the ESS corner that we showed the last two days again. The polynya's in the CAB are growing. At the lower right the pole hole, with a small polynya stiil on the edge.

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Re: Home brew AMSR2 extent & area calculation
« Reply #312 on: August 09, 2013, 11:09:55 AM »
Further some fjords in the Ellesmere are showing sudden melting, this could well be (it is even likely) and artifact. Contamination from the nearby land on the microwave brightness makes the measurement uncertain.
Hi Wipneus,

As always, thanks for the outstanding work with the AMSR2 data. Gracias!

I think the ice-out in the Ellesmere fjords is real, based on the MODIS visible imagery for Aug 8, 2013. The green tint in the open water confirms the presence of an algal bloom, which is a sure sign of above freezing water temps.  8)

The following image is attached from this lance MODIS source.
Cheers!
Lodger

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #313 on: August 09, 2013, 12:12:11 PM »
Further some fjords in the Ellesmere are showing sudden melting, this could well be (it is even likely) and artifact. Contamination from the nearby land on the microwave brightness makes the measurement uncertain.
Hi Wipneus,

As always, thanks for the outstanding work with the AMSR2 data. Gracias!

I think the ice-out in the Ellesmere fjords is real, based on the MODIS visible imagery for Aug 8, 2013. The green tint in the open water confirms the presence of an algal bloom, which is a sure sign of above freezing water temps.  8)

The following image is attached from this lance MODIS source.

Yes, I saw that too. I probably should rephrase it to, "somehow today we do not see the false ice caused by spillover from the nearby land".

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Re: Home brew AMSR2 extent & area calculation
« Reply #314 on: August 09, 2013, 07:42:22 PM »
As extra, the ESS corner that we showed the last two days again. The polynya's in the CAB are growing. At the lower right the pole hole, with a small polynya stiil on the edge.

(log in to see all this)

What might be really helpful is to show earlier/latest images side by side.  It might be necessary to crop off some of the less interesting parts to fit them on the page.

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Re: Home brew AMSR2 extent & area calculation
« Reply #315 on: August 10, 2013, 08:20:18 AM »
Update 20130809.

Extent: -61k9 (+742k vs 2012)
Area: -75k7 (+615k vs 2012)

Beaufort had a strong decline, followed by ESS, Chukchi and Kara. The CAB's extent did not change much, but its area fell considerably.
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                    2.2                   -15.1                    -4.6
               Kara Sea             Barents Sea           Greenland Sea
                  -10.3                    -1.1                     6.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    4.1                     0.0                    -1.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -6.6                   -25.5                   -10.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -61.9

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -73.7                     9.0                     3.3
               Kara Sea             Barents Sea           Greenland Sea
                   -5.7                    -0.8                     2.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    4.6                     0.0                    -2.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    6.4                   -13.4                    -6.2
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -75.7

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #316 on: August 10, 2013, 08:50:27 AM »
Region of the day is the Atlantic sector of the CAB. This is if I'm not mistaken where the cyclone lies now. Little polynya's near the pole hole keep appearing in spite of the moisture and clouds that hinder the  89GHz microwave channels that the hi res concentration maps are based on.

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Re: Home brew AMSR2 extent & area calculation
« Reply #317 on: August 10, 2013, 08:56:15 AM »
Color coded concentration map of the same region.

(log in to see)

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Re: Home brew AMSR2 extent & area calculation
« Reply #318 on: August 11, 2013, 08:29:07 AM »
Update 20130810.

Extent: -55k2 (+729k vs 2012)
Area: -75k6 (+697k vs 2012)

Beaufort had the biggest loss, followed at distance by ESS, Laptev and Kara. In extent the CAB has only a marginal decline and does not look like it is going to make the huge drop that happened in 2012. In area however, it is making that drop. CAB extent is now 4.15 Mm2, area is 3.70 Mm2, a compacting potential of 450k.
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                   -4.2                   -10.1                    -9.2
               Kara Sea             Barents Sea           Greenland Sea
                   -9.1                     0.2                     0.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.0                     0.0                    -5.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    8.5                   -23.7                    -2.9
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -55.2

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -28.2                    -0.7                   -18.4
               Kara Sea             Barents Sea           Greenland Sea
                  -11.5                     0.1                    -4.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.0                     0.0                    -3.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -7.1                    -3.2                     1.7
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -75.6


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Re: Home brew AMSR2 extent & area calculation
« Reply #319 on: August 11, 2013, 08:43:01 AM »
No compaction on the Atlantic section of the CAB. More polynya's are appearing than before in this season. The polynya near the edge of the pole hole is getting company.

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Re: Home brew AMSR2 extent & area calculation
« Reply #320 on: August 11, 2013, 08:49:41 AM »
And the color coded concentration map of the same region.

(also attached, log in to see)

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Re: Home brew AMSR2 extent & area calculation
« Reply #321 on: August 11, 2013, 03:46:41 PM »
The HYCOM map of Ice Speed and Drift (if it is in fact a nowcast) shows movement that would cause some dispersion in this region, and greater compaction on the opposite side of the low.
    If the Laptev Bite opens up in the next few weeks, the swathe of relatively thick ice N and E of Severnaya Zemlya will detach.  Another candidate for detachment is the thick patch NW of Wrangel Island, though this doesn't seem imminent based on forecast wind direction.

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Re: Home brew AMSR2 extent & area calculation
« Reply #322 on: August 12, 2013, 08:17:36 AM »
Update 20130811.

Extent: -65.3 (+792k vs 2012)
Area: -35.2 (+785k vs 2012)

For extent I can sum this up simply as CAA, ESS and Laptev. For area, the CAB (again) looses area while staying about level in extent.
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                    2.1                   -15.7                   -18.6
               Kara Sea             Barents Sea           Greenland Sea
                   -7.1                     0.0                    -4.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -5.7                     0.0                    -0.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -22.0                     5.1                     1.6
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -65.3

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -15.0                    -7.6                    -6.6
               Kara Sea             Barents Sea           Greenland Sea
                   -8.6                     0.0                    -2.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -4.3                     0.0                    -0.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -1.5                     4.1                     6.8
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -35.2


Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #323 on: August 12, 2013, 08:31:31 AM »
Region of the day is the Siberian section of the CAB with peripherals. There is broad melting from west to east and enough movement (polynya's popping and plopping) in the low concentration interior of the CAB. The North (East) passage is still in the works.

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Re: Home brew AMSR2 extent & area calculation
« Reply #324 on: August 12, 2013, 08:41:10 AM »
And the color coded concentration map of the region.

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Re: Home brew AMSR2 extent & area calculation
« Reply #325 on: August 13, 2013, 08:18:47 AM »
Update 20130812.

Extent: +18k0 (+1046k vs 2012)
Area: -10k5 (+860k vs 2012)

An uptick in extent makes the gap with 2012 over 1Meg.  The increase today is caused in the Beaufort, there is a slight northern wind but if that is enough explanation? The ESS is the only region with a large extent loss. CAB continues to loose area without much change in extent.

 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                   -3.6                   -18.3                    -1.5
               Kara Sea             Barents Sea           Greenland Sea
                   -2.8                    -0.1                     9.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -4.0                     0.0                    -3.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    8.1                    37.9                    -3.8
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    18.0

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -22.8                   -10.8                    -3.6
               Kara Sea             Barents Sea           Greenland Sea
                   -2.2                     0.0                     6.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -2.8                     0.0                    -1.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   28.1                     0.3                    -2.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -10.5


Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #326 on: August 13, 2013, 08:33:01 AM »
Beaufort is the region of the day, showing a rather large extent increase with a level area. As the image shows, the increase happens in a low concentration area. Perhaps the northern winds have caused some melt pool freeze: melt pools affect the ASI algorithm just as all algorithms.

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Re: Home brew AMSR2 extent & area calculation
« Reply #327 on: August 13, 2013, 08:38:52 AM »
And the color coded concentration map for the Beaufort.

(log in to see)

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Re: Home brew AMSR2 extent & area calculation
« Reply #328 on: August 13, 2013, 08:46:33 AM »
The ESS is not only loosing ice from the ice edge inward, polynyas in the interior are growing and expanding.

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Re: Home brew AMSR2 extent & area calculation
« Reply #329 on: August 13, 2013, 09:45:00 AM »
Beaufort is the region of the day, showing a rather large extent increase with a level area. As the image shows, the increase happens in a low concentration area. Perhaps the northern winds have caused some melt pool freeze: melt pools affect the ASI algorithm just as all algorithms.
Hi Wipneus,

I think there is a possibility that the change in sea ice concentration in the Beaufort sea on Aug 12/2013 is an artifact of clouds obscuring the sensor.

Do you have the ability to overlay your SIC charts with MODIS bands 3-6-7 imagery? It'd be informative to see if the area of newly reported sea ice extent >15% aligns with the band of cloud from the tile r05c02 image.  8)

At any rate, we'll know in a few more hours, as that tile fills in for Aug 13/2013. Hopefully the cloud moves on.  ;)
Cheers!
Lodger

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Re: Home brew AMSR2 extent & area calculation
« Reply #330 on: August 13, 2013, 11:41:20 AM »
Beaufort is the region of the day, showing a rather large extent increase with a level area. As the image shows, the increase happens in a low concentration area. Perhaps the northern winds have caused some melt pool freeze: melt pools affect the ASI algorithm just as all algorithms.
Hi Wipneus,

I think there is a possibility that the change in sea ice concentration in the Beaufort sea on Aug 12/2013 is an artifact of clouds obscuring the sensor.


I think so too (that it is possible), although the effect may be caused by water vapor that comes with the clouds.

IJIS and NSIDC, not using the 89GHz channels, have less problems with clouds and vapor. IJIS reports a "normal" extent decline today. For NSIDC we can have a look at the regional split when it publishes its concentration data.

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Re: Home brew AMSR2 extent & area calculation
« Reply #331 on: August 14, 2013, 08:23:07 AM »
Update 20130813.

Extent: -111k7 (+1075k vs 2012)
Area: -30k7 (+887k vs 2012)

Whatever caused the Beaufort bump yesterday, it is over with a huge drop in extent for that region. The CAB reverses the trend of the last few days, now we see a (moderate) extent drop and a bigger area rise, nothing to indicate in these numbers that the Big Drop is near. ESS declines further, today even the Greenland sea must be mentioned for a big decline. I haven't noticed any increased transport through the Fram Strait in contrast with expectations from some cyclone watchers.

 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -13.8                   -18.3                     3.7
               Kara Sea             Barents Sea           Greenland Sea
                   -4.9                     0.2                   -21.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.4                     0.0                    -0.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.6                   -43.6                    -3.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                  -111.7

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                   26.7                    -2.2                    -5.0
               Kara Sea             Barents Sea           Greenland Sea
                    0.9                     0.1                   -19.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.5                     0.0                     1.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -29.8                    -1.3                    -4.3
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -30.7


Artful Dodger

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Re: Home brew AMSR2 extent & area calculation
« Reply #332 on: August 14, 2013, 08:27:56 AM »
It's cloud illusions I recall...  ;)

Cheers!
Lodger

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Re: Home brew AMSR2 extent & area calculation
« Reply #333 on: August 14, 2013, 08:45:14 AM »
Region of the day is the Canadian Archipelago. The NW passage, southern route, can now open any day. Only a small 30% concentration ice field in the Parry channel is blocking it up.
In the Nares Strait most ice is melting in situ. The PII-2012 iceberg is now separated and seems to have moved, if that is that possible ?????

(image attached, log in to see)

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #334 on: August 14, 2013, 08:53:02 AM »
Color coded concentration map of the same region.

(need to be logged in to see)

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Re: Home brew AMSR2 extent & area calculation
« Reply #335 on: August 14, 2013, 09:34:46 AM »
Wipneus
I can't see anything through the clouds but winds are low at Han Island and only 14m/s at Littleton Island. Tide is at it's weak point so I can't imagine that PII2012-A-1 is on the move.
Terry



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Re: Home brew AMSR2 extent & area calculation
« Reply #336 on: August 14, 2013, 09:42:37 AM »
I think I can see it on NASA world view,  the true color view. See if I can make a reasonable image.

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Re: Home brew AMSR2 extent & area calculation
« Reply #337 on: August 14, 2013, 09:54:44 AM »
Attached are the screen shots. Do you agree?

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Re: Home brew AMSR2 extent & area calculation
« Reply #338 on: August 14, 2013, 12:34:36 PM »
I have double checked Wipneus, and I agree with you. It hasn't merely rotated a little, it's moved quite a distance. I now await today's Worldview image with much interest!
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Re: Home brew AMSR2 extent & area calculation
« Reply #339 on: August 14, 2013, 12:42:58 PM »
A small piece is still stuck at the same place but the rest of it is now loose:
https://forum.arctic-sea-ice.net/index.php/topic,176.msg12426.html#msg12426

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Re: Home brew AMSR2 extent & area calculation
« Reply #340 on: August 14, 2013, 03:38:51 PM »
Wipneus


Our boy is on the move - wonderful catch!


I'll be following along on the Nares thread.
Terry

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Re: Home brew AMSR2 extent & area calculation
« Reply #341 on: August 15, 2013, 08:22:39 AM »
Update 20130814.

Extent: -2k2 (+1142k vs 2012)
Area: +9k3 (+1030k vs 2012)

It is soo quit up there. Kara is continuing its decline, CAA has a large uptick in area.
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                   -4.0                    -0.8                    -2.5
               Kara Sea             Barents Sea           Greenland Sea
                  -10.8                     0.1                     9.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -0.1                     0.0                    -3.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    6.9                     2.6                    -0.4
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    -2.2

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                   -4.1                     2.0                    -1.4
               Kara Sea             Barents Sea           Greenland Sea
                  -12.0                     0.0                    14.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -0.3                     0.0                    -3.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   26.9                    -9.6                    -2.7
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                     9.3


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Re: Home brew AMSR2 extent & area calculation
« Reply #342 on: August 15, 2013, 08:39:58 AM »
Most of the melting is in the ice margin  of the CAB behind Severnaya Zemlya and Fransz Josef land, and the Kara sea of course. In the low concentration ice in the interior ever larger polynyas extent, but also close.

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Re: Home brew AMSR2 extent & area calculation
« Reply #343 on: August 15, 2013, 08:44:48 AM »
And the color code concentration map of that region.

(log in to see)

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Re: Home brew AMSR2 extent & area calculation
« Reply #344 on: August 15, 2013, 10:53:38 AM »
Extra close-up of Severnaya Zemlya. Nobody said "torch" here, but looking at the ice, warm winds are coming from Russia. It also looks like the North (East) passage might open first around the islands, and not along the continent. If that is possible.

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Re: Home brew AMSR2 extent & area calculation
« Reply #345 on: August 16, 2013, 08:25:27 AM »
Update 20130815.

Extent: -36k1 (+1199k vs 2012)
Area: -82k6 (+1017k vs 2012)

CAA has a very big drop today, in extent but especially in area. CAA has had some large swings lately, so it may not mean as big at it appears. Also the CAB has a large extent loss, compared with the last few days. Beaufort has a big uptick, as the remainder of the ice is all of low concentration that is to be expected: near the cut off of 15% a small concentration change has a large influence on the calculated extent.
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -20.1                    -6.8                    -8.8
               Kara Sea             Barents Sea           Greenland Sea
                    2.7                    -0.2                     4.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.3                     0.0                    -0.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -33.1                    26.5                    -1.8
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -36.1

Area:
           Arctic Basin       East Siberian Sea              Laptev Sea
                  -18.6                   -14.2                    -8.8
               Kara Sea             Barents Sea           Greenland Sea
                    4.7                    -0.1                     0.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.8                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -60.0                    19.5                    -6.6
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -82.6


Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #346 on: August 16, 2013, 08:40:02 AM »
The Canadian Archipelago is today's region and I think we can declare the NW passage (southern route) open, at least for ice watchers.

(see this after logging in)

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Re: Home brew AMSR2 extent & area calculation
« Reply #347 on: August 16, 2013, 08:51:04 AM »
And the color coded concentration map of the region. I took the "raw" version this time where the coastal phantom ice has not been removed. This makes sure the passage is not opened by my ice-clean-up algorithm.

(attached, log in to see)

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Re: Home brew AMSR2 extent & area calculation
« Reply #348 on: August 17, 2013, 08:29:21 AM »
Waiting for the sea ice concentration data from Uni Hamburg....

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Re: Home brew AMSR2 extent & area calculation
« Reply #349 on: August 17, 2013, 09:31:45 AM »
with the big HP setting up I think there is a good chance we see you're his-red home brew have some big polyannas.

Hopefully Jaxa is ready to supplement AMSR2 data for 85N.
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