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Author Topic: Home brew AMSR2 extent & area calculation  (Read 1071460 times)

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3250 on: September 04, 2017, 05:34:33 PM »
The last frame correspondents to a century (+104k) CAB area increase in this Jaxa AMSR2 SIC animation.
« Last Edit: September 05, 2017, 07:54:16 AM by Wipneus »

binntho

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Re: Home brew AMSR2 extent & area calculation
« Reply #3251 on: September 05, 2017, 06:25:00 AM »
Now with temperatures that "hoover" ( I know I may not use the word correctly, hope you know what I mean) around the melt/freezing point it does not take big temperature rise to start melting again.
I guess you mean "hover" - a bird can hover, helicopters as well. A "hoover" is a vacuum cleaner, named after the company to first make them generally available, founded by William Henry Hoover (anglicized from German Huber).

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3252 on: September 05, 2017, 07:56:33 AM »
GIF not playing

Sorry about that, it should work now. Since this animation is from a day later, the century increase is not the last frame but one earlier.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3253 on: September 05, 2017, 07:59:27 AM »
I guess you mean "hover" - a bird can hover, helicopters as well. A "hoover" is a vacuum cleaner, named after the company to first make them generally available, founded by William Henry Hoover (anglicized from German Huber).

Thanks for the explanation, I will try to remember since the spell check won't  help me here.

oren

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Re: Home brew AMSR2 extent & area calculation
« Reply #3254 on: September 05, 2017, 08:10:32 AM »
The animation looks very much like an early refreeze of the inner "slushy" areas, much as expected but a week earlier than I thought.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3255 on: September 05, 2017, 08:12:27 AM »
The extent increases have stopped, today the extent dropped a little mostly in the  ESS and CAB. Area is still increasing, the CAB saw a big +60k, partly offset by the -23k drop in the ESS.

Update 20170904.

Extent: -25.9 (+643k vs 2016, +366k vs 2015, -472k vs 2014, -419k vs 2013, +1242k vs 2012)
Area: +17.9 (+817k vs 2016, +275k vs 2015, -336k vs 2014, -573k vs 2013, +1165k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -8.6                    -9.4                     0.5
               Kara Sea             Barents Sea           Greenland Sea
                   -0.1                    -1.4                    -5.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.2                     0.0                    -0.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -5.9                     2.1                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -25.9

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   60.4                   -23.5                    -0.4
               Kara Sea             Barents Sea           Greenland Sea
                   -0.6                    -0.6                    -7.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.6                     0.0                    -0.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.0                    -4.2                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    17.9


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3256 on: September 06, 2017, 07:20:35 PM »
Extent and area have resumed declining again. Extent is almost (+5k) below the 2017 minimum on 1st of September. The bump in area was much larger, today's are is still +140k above the same minimum.

Update 20170905.

Extent: -33.2 (+595k vs 2016, +385k vs 2015, -440k vs 2014, -436k vs 2013, +1210k vs 2012)
Area: -46.0 (+669k vs 2016, +249k vs 2015, -411k vs 2014, -593k vs 2013, +1077k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -27.9                    -1.0                    -1.2
               Kara Sea             Barents Sea           Greenland Sea
                   -0.5                     0.2                     5.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.1                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -8.7                     1.2                     0.2
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -33.2

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -54.4                     2.3                    -4.3
               Kara Sea             Barents Sea           Greenland Sea
                   -0.8                     0.2                     8.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.1                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -4.6                     6.9                     0.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -46.0


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3257 on: September 07, 2017, 07:21:31 PM »
Extent increased in the CAA but dropped in the Basin resulting in a small net increase. Area kept increasing.

Update 20170906.

Extent: +1.2 (+624k vs 2016, +370k vs 2015, -377k vs 2014, -408k vs 2013, +1251k vs 2012)
Area: +65.1 (+822k vs 2016, +290k vs 2015, -266k vs 2014, -511k vs 2013, +1133k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -16.8                    -3.7                     2.7
               Kara Sea             Barents Sea           Greenland Sea
                   -0.5                    -1.6                     5.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.8                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   17.0                    -2.9                    -0.2
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                     1.2

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   47.6                    -1.8                     3.4
               Kara Sea             Barents Sea           Greenland Sea
                   -0.1                    -0.9                     7.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.2                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   13.1                    -4.8                    -0.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    65.1


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3258 on: September 08, 2017, 07:03:22 PM »
Net extent loss is minimal (some gained in the CAA, some lost in the CAB). Area increased, evenly by the active regions. 2017 minimum is still at 1st of September.

Update 20170907.

Extent: -2.8 (+665k vs 2016, +346k vs 2015, -404k vs 2014, -386k vs 2013, +1270k vs 2012)
Area: +17.0 (+868k vs 2016, +347k vs 2015, -367k vs 2014, -469k vs 2013, +1209k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -16.3                    -1.8                     2.4
               Kara Sea             Barents Sea           Greenland Sea
                    0.2                     0.3                    -4.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    6.2                     0.0                     0.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   11.4                    -1.1                     0.4
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.1                     0.0                    -2.8

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    0.8                     4.0                     2.0
               Kara Sea             Barents Sea           Greenland Sea
                    0.4                     0.2                    -2.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.7                     0.0                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    2.7                     5.0                     0.4
             Bering Sea          Sea of Okhotsk              Total Area
                    0.1                     0.0                    17.0


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

2phil4u

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Re: Home brew AMSR2 extent & area calculation
« Reply #3259 on: September 09, 2017, 02:16:36 PM »
What do you think for the next few days.
Area/Extent is good this year, producing of cold air is possible.
Do you think that more then -200k is possible.
Which parts of the arctic will melt the next time and which are refreezing.
I think this year is very surprising after the beginning of the melt seasonl.
Maybe there is a link between fragmented ice in autumn and better ice in the next year, because the high temps n80 show also that many heat went in the space.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3260 on: September 09, 2017, 06:43:49 PM »
The extent decline resumes, extent is now again at the lowest value this year. Not likely to happen for area that increased again, gap is about 250k, resulting in a very early date for the (preliminary) minimum, first of September.

Update 20170908.

Extent: -35.9 (+616k vs 2016, +350k vs 2015, -415k vs 2014, -408k vs 2013, +1217k vs 2012)
Area: +30.5 (+921k vs 2016, +421k vs 2015, -260k vs 2014, -427k vs 2013, +1230k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -9.3                    -8.6                     5.3
               Kara Sea             Barents Sea           Greenland Sea
                   -0.4                    -0.1                    -5.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    5.8                     0.0                     1.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -16.0                    -8.3                    -0.4
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -35.9

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   55.4                    -6.4                     4.2
               Kara Sea             Barents Sea           Greenland Sea
                   -0.5                    -0.1                    -6.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.4                     0.0                     1.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -8.0                   -11.9                    -0.4
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    30.5


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3261 on: September 10, 2017, 06:46:12 PM »
Little to comment about today's extent drop, it is small and regionally nothing stands out. The small area drop is mostly in the CAB and ESS.

Update 20170909.

Extent: -20.3 (+571k vs 2016, +290k vs 2015, -425k vs 2014, -370k vs 2013, +1171k vs 2012)
Area: -27.8 (+831k vs 2016, +313k vs 2015, -259k vs 2014, -371k vs 2013, +1090k vs 2012)
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -6.5                    -5.2                     2.7
               Kara Sea             Barents Sea           Greenland Sea
                   -1.4                    -0.2                    -5.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.2                     0.0                    -1.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -2.2                     0.0                     0.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -20.3

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -13.3                   -13.3                     2.8
               Kara Sea             Barents Sea           Greenland Sea
                   -0.8                    -0.1                    -9.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -0.1                     0.0                    -0.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    4.3                     2.8                     0.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -27.8


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3262 on: September 10, 2017, 06:57:40 PM »
Animation of the ESS and Laptev edge. The increasing concentration in the packs interior can be seen. The ice facing the Laptev looks a bit strange to me, it looks like two packs separated by a crack that opens and closes again. How can the cohesion be expalined?

seaice.de

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Re: Home brew AMSR2 extent & area calculation
« Reply #3263 on: September 10, 2017, 07:48:48 PM »
The ice facing the Laptev looks a bit strange to me, it looks like two packs separated by a crack that opens and closes again. How can the cohesion be expalined?
That's an interesting feature. It is clearly visible in the Sentinel 1 SAR image as well.

slow wing

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Re: Home brew AMSR2 extent & area calculation
« Reply #3264 on: September 10, 2017, 10:38:02 PM »
...The ice facing the Laptev looks a bit strange to me, it looks like two packs separated by a crack that opens and closes again. How can the cohesion be expalined?
Striking how closely the shape of the ice appears to match the bathymetry. The ice edge appears to correlate with the termination of the deep water.

Concerning the crack, the bathymetry map shows the deep water is split almost evenly into two basins - the Amundsen Basin on the Pacific side and the Nansen Basin on the Atlantic side - separated by the Nansen-Gakkol Ridge.

Could the edge of the ice be determined in large part by the edge of the deep water? Further, could the crack in the ice, along with its terminating lead (is that a manifestation of the frequently appearing "Laptev Bite"?), correlate with the Nansen-Gakkol Ridge?

Image source: https://nordpil.com/static/images/arctic_topographic_map_full.jpg
« Last Edit: September 10, 2017, 11:05:18 PM by slow wing »

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3265 on: September 11, 2017, 06:11:17 PM »
The total extent and area numbers are strongly influenced by the CAA figures. Without that extent would have dropped a little and area would have dropped much stronger.
Minimum area for 2017 was still at 1 September, -200k below today.

Extent: +10.7 (+521k vs 2016, +278k vs 2015, -400k vs 2014, -367k vs 2013, +1178k vs 2012)
Area: -28.1 (+646k vs 2016, +280k vs 2015, -301k vs 2014, -424k vs 2013, +1089k vs 2012)
 
You will find the updated graphs in the top post

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -7.8                   -10.4                     7.6
               Kara Sea             Barents Sea           Greenland Sea
                    1.1                    -0.2                    -8.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    2.0                     0.0                    -0.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   23.4                     3.6                     0.1
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.1                     0.0                    10.7

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -50.8                   -13.4                     6.9
               Kara Sea             Barents Sea           Greenland Sea
                    0.7                    -0.2                    -7.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.9                     0.0                    -0.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   31.1                     3.4                     0.1
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.1                     0.0                   -28.1


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3266 on: September 11, 2017, 06:17:52 PM »
In September Greenland ice normally increases (extent and area) due to increased Fram Strait export. Not this September until now, heading for a record low at a record late date.

Dharma Rupa

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Re: Home brew AMSR2 extent & area calculation
« Reply #3267 on: September 11, 2017, 09:22:46 PM »
In September Greenland ice normally increases (extent and area) due to increased Fram Strait export. Not this September until now, heading for a record low at a record late date.

Is there anything to export?

Pavel

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Re: Home brew AMSR2 extent & area calculation
« Reply #3268 on: September 11, 2017, 10:51:04 PM »
Lack of Fram Export, but export to the Beaufort sea, Garlic Press and Nares strait export. Some of exported MYI may survive next season though

Shared Humanity

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Re: Home brew AMSR2 extent & area calculation
« Reply #3269 on: September 12, 2017, 04:38:33 AM »
First time I've heard anyone call ice moving into the Beaufort as export.

Pavel

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Re: Home brew AMSR2 extent & area calculation
« Reply #3270 on: September 12, 2017, 08:28:06 AM »
There's no probability for 3 and thicker metres ice to be melted in CAB, but this may happen in the Beaufort or CAA. CAB lose its best MYI reserves that's why I call it export despite the overall SIE could be higher for a while

Shared Humanity

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Re: Home brew AMSR2 extent & area calculation
« Reply #3271 on: September 12, 2017, 03:50:22 PM »
Export doesn't mean what you think it means. Yes the ice moves around and the Beaufort was a killing ground for MYI last year. This year there was very little MYI in the Beaufort to melt. Last year, the Atlantic side, ice north of Svalbard and Franz Josef, was decimated but this year the ice here proved relatively resilient. It would be no more accurate to call ice moving into this area export IMHO.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3272 on: September 12, 2017, 06:30:08 PM »
Extent and area losses in the CAB, the edge on the Atlantic side is pulling back. Extent is at its lowest value, while area is still +133k more than on the 1st of September.

Update 20170911.

Extent: -13.2 (+446k vs 2016, +246k vs 2015, -362k vs 2014, -387k vs 2013, +1205k vs 2012)
Area: -68.2 (+476k vs 2016, +168k vs 2015, -348k vs 2014, -529k vs 2013, +1053k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -30.3                     4.5                     1.9
               Kara Sea             Barents Sea           Greenland Sea
                    0.4                     0.0                     4.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.1                     0.0                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    3.3                    -0.5                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.1                     0.0                   -13.2

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -79.2                     4.2                    -1.7
               Kara Sea             Barents Sea           Greenland Sea
                    0.0                     0.0                     9.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    2.7                     0.0                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -3.0                    -1.2                    -0.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.1                     0.0                   -68.2


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3273 on: September 12, 2017, 06:40:13 PM »
Ice edge facing Barents Sea pulls back.

Shared Humanity

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Re: Home brew AMSR2 extent & area calculation
« Reply #3274 on: September 12, 2017, 11:57:48 PM »
Both migration and a lot of melt in that animation.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3275 on: September 13, 2017, 07:14:41 PM »
Upticks, especially in area. CAB extent dropping -11k is about the only melting sign.

Update 20170912.

Extent: +26.1 (+375k vs 2016, +273k vs 2015, -318k vs 2014, -357k vs 2013, +1266k vs 2012)
Area: +67.5 (+361k vs 2016, +203k vs 2015, -290k vs 2014, -500k vs 2013, +1105k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -10.9                     9.5                     2.7
               Kara Sea             Barents Sea           Greenland Sea
                   -1.0                     0.1                     9.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    4.8                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    9.0                     2.6                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.1                     0.0                    26.1

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   36.0                     7.3                     5.6
               Kara Sea             Barents Sea           Greenland Sea
                   -0.7                     0.1                     5.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    4.5                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    7.0                     2.0                     0.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.1                     0.0                    67.5


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3276 on: September 14, 2017, 06:40:18 PM »
Increases in extent and area. It is near certain that minimum area was reached at 1st of September, we are now +267k above that day. Extent is only +46k above the preliminary minimum from the 11th, still possible to go below that.

Update 20170913.

Extent: +19.1 (+309k vs 2016, +299k vs 2015, -262k vs 2014, -365k vs 2013, +1274k vs 2012)
Area: +67.5 (+312k vs 2016, +246k vs 2015, -244k vs 2014, -458k vs 2013, +1177k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -10.5                     2.7                     3.1
               Kara Sea             Barents Sea           Greenland Sea
                   -0.1                     0.0                     5.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -0.8                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   19.1                     0.6                     0.2
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    19.1

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   35.0                    -0.5                     6.4
               Kara Sea             Barents Sea           Greenland Sea
                   -0.3                     0.0                     6.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.2                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   17.5                     4.5                     0.1
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.1                     0.0                    67.5


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Richard Rathbone

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Re: Home brew AMSR2 extent & area calculation
« Reply #3277 on: September 14, 2017, 11:23:46 PM »
There was one of those dodgy area downspikes that JAXA didn't follow at the beginning of the month. Its not surprising if that turns out to be the minimum.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3278 on: September 15, 2017, 02:37:42 PM »
There was one of those dodgy area downspikes that JAXA didn't follow at the beginning of the month. Its not surprising if that turns out to be the minimum.

Yes, two notes:

- the "spike" lasted 11-12 days, see attached.
- Jaxa area reached minimum on the 11th, just -50k below the value on the first.

Richard Rathbone

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Re: Home brew AMSR2 extent & area calculation
« Reply #3279 on: September 15, 2017, 03:44:53 PM »
It looked rather sharper on the CAB alone, which is the graph of yours I tend to watch around the minimum.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3280 on: September 15, 2017, 04:02:32 PM »
CAB only area differences attached.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3281 on: September 15, 2017, 06:03:44 PM »
Refreezing continues, in the pack concentration rises and polynya's close.

Update 20170914.

Extent: +24.7 (+317k vs 2016, +350k vs 2015, -193k vs 2014, -342k vs 2013, +1285k vs 2012)
Area: +71.6 (+342k vs 2016, +301k vs 2015, -106k vs 2014, -381k vs 2013, +1213k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   15.5                     3.2                     1.0
               Kara Sea             Barents Sea           Greenland Sea
                    0.6                     0.1                    -1.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.7                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    4.7                    -2.0                    -0.3
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.1                     0.0                    24.7

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   60.7                     8.2                     2.6
               Kara Sea             Barents Sea           Greenland Sea
                    0.6                     0.0                    -1.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.9                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    1.6                    -4.5                    -0.3
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.1                     0.0                    71.6


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3282 on: September 16, 2017, 06:43:13 PM »
Slow increases.

Update 20170915.

Extent: +21.8 (+369k vs 2016, +347k vs 2015, -195k vs 2014, -306k vs 2013, +1307k vs 2012)
Area: +22.4 (+387k vs 2016, +284k vs 2015, -107k vs 2014, -364k vs 2013, +1262k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   32.5                    -0.8                     0.4
               Kara Sea             Barents Sea           Greenland Sea
                    1.5                     0.3                    -9.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -2.9                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    2.5                    -2.5                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    21.8

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   45.3                    -6.1                     1.2
               Kara Sea             Barents Sea           Greenland Sea
                    1.2                     0.2                   -10.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -3.6                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -3.0                    -2.3                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    22.4

Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3283 on: September 16, 2017, 06:48:37 PM »
Animation of the CAA. The "garlic press" in operation. The last frame shows an interesting web of cracks in the MY ice north of the islands.

A-Team

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Re: Home brew AMSR2 extent & area calculation
« Reply #3284 on: September 16, 2017, 08:27:56 PM »
last frame shows an interesting web of cracks in the MY ice north of the islands

There was a nice Sentinel-1 radar swath of that area the other day, a 1km resolution convenient mosaic at R Saldo's http://www.seaice.dk

That Beaufort tongue is quite persistent; the ESRL melt picture for Sept 15 shows ongoing melt there, mostly from the bottom. The wind (vector overlay, 4th image) starts to pick up on the 18th as expected from the predicted low pressure cyclonic event.
« Last Edit: September 16, 2017, 09:19:55 PM by A-Team »

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3285 on: September 17, 2017, 07:48:04 PM »
Changes are still mostly in the CAB and CAA.

Update 20170916.

Extent: +37.6 (+412k vs 2016, +318k vs 2015, -228k vs 2014, -259k vs 2013, +1355k vs 2012)
Area: +82.0 (+647k vs 2016, +313k vs 2015, -145k vs 2014, -258k vs 2013, +1332k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   45.9                     4.4                     2.1
               Kara Sea             Barents Sea           Greenland Sea
                    1.4                    -0.2                     1.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    4.9                     0.0                     0.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -23.7                     0.5                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    37.6

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   82.6                     7.2                     2.2
               Kara Sea             Barents Sea           Greenland Sea
                    0.6                    -0.2                     1.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    6.7                     0.0                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -25.1                     7.0                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    82.0


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3286 on: September 18, 2017, 07:10:11 PM »
Same comments as yesterday.

Update 20170917.

Extent: +32.9 (+428k vs 2016, +315k vs 2015, -177k vs 2014, -236k vs 2013, +1402k vs 2012)
Area: +10.2 (+576k vs 2016, +284k vs 2015, -77k vs 2014, -260k vs 2013, +1364k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   18.0                     1.4                     1.5
               Kara Sea             Barents Sea           Greenland Sea
                   -0.2                     0.4                     5.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.1                     0.0                    -0.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   10.2                    -2.1                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    32.9

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -7.6                     1.4                     2.2
               Kara Sea             Barents Sea           Greenland Sea
                    0.4                     0.3                     3.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -4.4                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   21.5                    -6.4                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    10.2


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3287 on: September 19, 2017, 06:27:54 PM »
Continuing the slow increase in extent, while area increases are a bit faster.

Update 20170918.

Extent: +12.8 (+366k vs 2016, +258k vs 2015, -184k vs 2014, -262k vs 2013, +1362k vs 2012)
Area: +63.1 (+486k vs 2016, +275k vs 2015, -21k vs 2014, -240k vs 2013, +1381k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    5.3                    -0.1                     3.1
               Kara Sea             Barents Sea           Greenland Sea
                    1.2                     0.6                    -1.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.4                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    7.3                    -3.7                     0.3
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.2                     0.0                    12.8

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   63.3                     1.1                     1.4
               Kara Sea             Barents Sea           Greenland Sea
                    0.1                     0.3                     1.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.5                     0.0                     0.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -0.3                    -5.5                     0.2
             Bering Sea          Sea of Okhotsk              Total Area
                    0.1                     0.0                    63.1


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3288 on: September 20, 2017, 06:45:05 PM »
And drops both in extent and area show that the real refeeze has yet to start.

Update 20170919.

Extent: -28.3 (+304k vs 2016, +153k vs 2015, -245k vs 2014, -330k vs 2013, +1234k vs 2012)
Area: -42.3 (+458k vs 2016, +182k vs 2015, -141k vs 2014, -294k vs 2013, +1288k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -10.7                    -0.8                     2.3
               Kara Sea             Barents Sea           Greenland Sea
                   -1.1                    -0.8                    -5.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    2.0                     0.0                     0.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -8.8                    -4.7                    -0.3
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.1                     0.0                   -28.3

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -33.0                     1.2                     0.8
               Kara Sea             Barents Sea           Greenland Sea
                    0.9                    -0.3                    -8.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.2                     0.0                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -0.4                    -1.9                    -0.2
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -42.3


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3289 on: Today at 07:16:25 PM »
No changes to speak of.

Update 20170920.

Extent: +16.5 (+294k vs 2016, +131k vs 2015, -287k vs 2014, -349k vs 2013, +1212k vs 2012)
Area: -9.1 (+472k vs 2016, +127k vs 2015, -182k vs 2014, -368k vs 2013, +1221k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -2.6                    -3.9                     4.4
               Kara Sea             Barents Sea           Greenland Sea
                    4.5                    -0.3                     5.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    2.5                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    7.9                    -0.6                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.2                     0.0                    16.5

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -18.2                    -2.2                    -0.7
               Kara Sea             Barents Sea           Greenland Sea
                    1.4                    -0.2                     5.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.5                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    3.9                    -0.1                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.1                     0.0                    -9.1


Delta map attached: red/blue means the concentration went below/over the 15% cut-off. Reddish/bluish means the concentration decreased/increased by more than 7%.