Please support this Forum and Neven's Blog

Author Topic: Home brew AMSR2 extent & area calculation  (Read 1027965 times)

Wipneus

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3200 on: August 16, 2017, 09:16:42 PM »
It looks to me like the area fluctuations at least in the Laptev bite are due to cloud.

Here is a Jaxa AMSR2 animation that is much less sensitive to  clouds/vapor.

A-Team

  • ASIF Upper Class
  • Posts: 1721
    • View Profile
Re: Home brew AMSR2 extent & area calculation
« Reply #3201 on: August 16, 2017, 11:54:49 PM »
Jaxa AMSR2 animation that is much less sensitive to  clouds/vapor.
The daily difference version, forward and back, is curious.

Wipneus

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3202 on: August 17, 2017, 10:32:20 AM »
Crazy fluctuations in CAB area. Last three days: +95k, -117k and now +111k. I will say more about it in a second post. Extent is more reasonable, Greenland Sea drops most with smaller contributions on several fronts.

Update 20170816.

Extent: -82.2 (-45k vs 2016, -210k vs 2015, -697k vs 2014, -619k vs 2013, +721k vs 2012)
Area: +67.5 (+318k vs 2016, +130k vs 2015, -684k vs 2014, -416k vs 2013, +777k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -14.9                     4.3                    -4.8
               Kara Sea             Barents Sea           Greenland Sea
                  -17.9                    -0.9                   -37.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.1                     0.0                    -0.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -7.6                    -1.3                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -82.2

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  110.9                    -1.1                    -3.8
               Kara Sea             Barents Sea           Greenland Sea
                   -6.1                    -0.6                   -21.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -0.5                     0.0                    -0.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -4.7                    -4.8                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     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

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3203 on: August 17, 2017, 10:41:55 AM »
Attached the regional area graph of the CAB. Black=2017 UH AMSR2, purple is 2017 Jaxa.

Large swings are not unusual for UH AMSR2, but not in every year in the same amount.

Further the Jaxa data is much smoother and tends to follow the tops of the UH data. I am inclined to think that those (the tops) are a more realistic area value.

Wipneus

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3204 on: August 17, 2017, 10:44:54 AM »
And the disappearance of sea ice in the Greenland Sea. Most of the remaining ice is is fast or only recently mobile.

oren

  • ASIF Upper Class
  • Posts: 1480
    • View Profile
Re: Home brew AMSR2 extent & area calculation
« Reply #3205 on: August 17, 2017, 10:56:21 AM »
Attached the regional area graph of the CAB. Black=2017 UH AMSR2, purple is 2017 Jaxa.

Large swings are not unusual for UH AMSR2, but not in every year in the same amount.

Further the Jaxa data is much smoother and tends to follow the tops of the UH data. I am inclined to think that those (the tops) are a more realistic area value.
Wipneus, do you have a chart of just the CAB JAXA area since 2012?
Even better, where can I download the regional JAXA area data? I couldn't find it on the web.

Wipneus

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3206 on: August 17, 2017, 12:59:56 PM »
Attached the regional area graph of the CAB. Black=2017 UH AMSR2, purple is 2017 Jaxa.

Large swings are not unusual for UH AMSR2, but not in every year in the same amount.

Further the Jaxa data is much smoother and tends to follow the tops of the UH data. I am inclined to think that those (the tops) are a more realistic area value.
Wipneus, do you have a chart of just the CAB JAXA area since 2012?
Even better, where can I download the regional JAXA area data? I couldn't find it on the web.

Data for the graphic above is here:
https://sites.google.com/site/arctischepinguin/home/amsr2/data/Jaxa_AMSR2_L3_10km_Area_Extent-v0.0.txt

Notes:

- normally updates 24 hours after the others;
- total extent and area are calculated over the 14 well-known regions. E.g. Baltic, Maine and Alaska are ignored;
- no two day averages like ADS's product;
- apart from the above my day-to-day extent data is not exactly the same as ADS/Jaxa's numbers. Why that is I do not know yet.

oren

  • ASIF Upper Class
  • Posts: 1480
    • View Profile
Re: Home brew AMSR2 extent & area calculation
« Reply #3207 on: August 17, 2017, 02:23:21 PM »
Thank you Wipneus.

jdallen

  • ASIF Upper Class
  • Posts: 2421
    • View Profile
Re: Home brew AMSR2 extent & area calculation
« Reply #3208 on: August 18, 2017, 12:54:40 AM »
Crazy fluctuations in CAB area. Last three days: +95k, -117k and now +111k. I will say more about it in a second post. Extent is more reasonable, Greenland Sea drops most with smaller contributions on several fronts.

Update 20170816.

Extent: -82.2 (-45k vs 2016, -210k vs 2015, -697k vs 2014, -619k vs 2013, +721k vs 2012)
Area: +67.5 (+318k vs 2016, +130k vs 2015, -684k vs 2014, -416k vs 2013, +777k vs 2012)

I'm wondering if the fluctuation is a side effect of how granular the pack has become? Is it perhaps tied to the resolution limits of the sensing and computational systems? (E.g 12.5 KM grid)
This space for Rent.

Wipneus

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3209 on: August 18, 2017, 10:07:18 AM »
Small extent uptick. The maps show that activity has not stopped. Drops on the Pacific front and increases to the ESS/Laptev side.

Update 20170817.

Extent: +12.3 (+74k vs 2016, -166k vs 2015, -612k vs 2014, -579k vs 2013, +772k vs 2012)
Area: -0.1 (+463k vs 2016, +121k vs 2015, -687k vs 2014, -415k vs 2013, +871k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    7.2                     6.0                   -16.1
               Kara Sea             Barents Sea           Greenland Sea
                   -2.6                     1.0                     7.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.2                     0.0                    -0.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    4.2                     4.6                     0.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    12.3

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    5.4                     0.2                   -13.0
               Kara Sea             Barents Sea           Greenland Sea
                   -3.4                     0.1                     4.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.4                     0.0                    -0.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    0.5                     5.6                     0.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    -0.1



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

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3210 on: August 19, 2017, 03:12:03 PM »
A small uptick in extent, area declined some.

Update 20170818.

Extent: +6.9 (+158k vs 2016, -131k vs 2015, -536k vs 2014, -608k vs 2013, +813k vs 2012)
Area: -28.1 (+569k vs 2016, +64k vs 2015, -709k vs 2014, -594k vs 2013, +850k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   16.2                    -4.3                    -6.9
               Kara Sea             Barents Sea           Greenland Sea
                   -4.3                     4.2                    12.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -2.4                     0.0                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.3                     1.1                    -0.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                     6.9

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   14.1                   -22.0                    -6.3
               Kara Sea             Barents Sea           Greenland Sea
                   -4.9                     3.5                     5.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.7                     0.0                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -3.4                   -12.5                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     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

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3211 on: August 19, 2017, 03:15:16 PM »
Update of the CAA animation. I still see a lot of break up activity in the garlic press, it was not all that mobile as I thought.

Sterks

  • ASIF Citizen
  • Posts: 109
  • Member # 1000
    • View Profile
Re: Home brew AMSR2 extent & area calculation
« Reply #3212 on: August 19, 2017, 03:32:01 PM »
Thank you for all this work, Wipneus.
I am very much surprised how resilient the Beaufort vestige of ice is turning out to be.
But based on Piomas thickness and SSTs over nearby waters, that should go before minimum.

Wipneus

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3213 on: August 20, 2017, 10:43:15 AM »
Continuing net increasing extent and area. Regionally the declines are near (east) Beaofort and Laptev and increases near Chukchi and ESS.

Update 20170819.

Extent: +15.0 (+275k vs 2016, -15k vs 2015, -507k vs 2014, -564k vs 2013, +876k vs 2012)
Area: +29.8 (+639k vs 2016, +165k vs 2015, -588k vs 2014, -588k vs 2013, +898k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   25.2                    -2.4                    -9.7
               Kara Sea             Barents Sea           Greenland Sea
                   -2.7                     1.6                    -6.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.1                     0.0                     0.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   10.4                    -1.9                    -0.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                    15.0

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   39.0                     6.6                   -11.0
               Kara Sea             Barents Sea           Greenland Sea
                   -1.3                     1.0                    -3.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.7                     0.0                     0.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    2.1                    -4.5                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                    29.8


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

  • ASIF Governor
  • Posts: 3452
    • View Profile
    • Arctische Pinguin
Re: Home brew AMSR2 extent & area calculation
« Reply #3214 on: August 21, 2017, 06:32:29 PM »
And another regional century for the CAB, this time a decline. The two outstanding things at the moment: the continuing development of the "Beaufort Bite" (see attached delta map)  and the record low Greenland Sea sea ice cover, both measured as extent and area.

Update 20170820.

Extent: -20.8 (+253k vs 2016, +55k vs 2015, -488k vs 2014, -524k vs 2013, +993k vs 2012)
Area: -125.0 (+495k vs 2016, +134k vs 2015, -643k vs 2014, -658k vs 2013, +858k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -10.7                    -1.5                   -12.8
               Kara Sea             Barents Sea           Greenland Sea
                   -0.5                     0.9                    -3.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.8                     0.0                    -0.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    8.5                    -1.4                     0.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                     0.0                   -20.8

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                 -104.0                    -0.5                   -11.1
               Kara Sea             Barents Sea           Greenland Sea
                   -1.2                    -0.6                    -1.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.2                     0.0                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    4.1                   -10.0                     0.0
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                  -125.0


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%.