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Messages - Wipneus

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1
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 23, 2017, 01:49:37 PM »
Upticks both in extent and area. In those regions where ice dropped in the last few days, the extent "recovers": Greenland Sea, Kara and Laptev. The area increase in those regions is much smaller, so the 15% cutoff may play a role here.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-22 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4417.3   -2.0   -10.4    449.6  -12.8  -368.5    467.1  +26.9   -94.0
               Kara Sea             Barents Sea           Greenland Sea
   208.4  +63.8  -340.7     54.6   -3.2  -108.5    264.7  +39.7  -141.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   298.4  -16.2   -40.9      6.7   -0.0    +6.7    146.0  -29.3  -153.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   554.8  -22.3  -105.6    265.3   -1.8  -122.2    122.6   -2.5  -203.7
             Bering Sea          Sea of Okhotsk                   Lakes
    10.8   +6.6    +5.5     20.3   -0.0   +20.3    121.7  -51.3    -8.2
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7289.5  +46.8 -1654.3

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3534.7  +71.1  -168.3    217.2  -16.4  -310.0    246.4   +4.0  -102.5
               Kara Sea             Barents Sea           Greenland Sea
    89.7  +19.3  -242.0     17.4   +0.9   -52.6    115.0   -2.0   -79.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   127.5   -8.6   -20.5      1.4   -0.3    +1.4     56.7   -9.4   -73.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   358.8  -20.2   -80.0    156.2   +2.3   -93.3     45.6   -5.5  -147.8
             Bering Sea          Sea of Okhotsk                   Lakes
     2.2   +1.5    +0.8      4.6   +0.2    +4.6     74.5  -18.8   +17.6
          Other regions       Total (ex. lakes)
     2.2   +0.0    +2.2   4975.6  +36.9 -1360.4


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%.

2
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 23, 2017, 09:29:24 AM »

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-21 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin   
  4419.2   +6.6   -11.1
Area (value, one day change, anomaly):
   Central Arctic Basin   
  3463.6  -86.6  -249.5


The extent value given here closely  matches the extent data in your regional extent graph.
https://sites.google.com/site/arctischepinguin/home/amsr2/grf/amsr2-extent-regional.png
However the area is about 15% lower than in your area graph.
https://sites.google.com/site/arctischepinguin/home/amsr2/grf/amsr2-area-regional.png

I realise the measurements come from different sources but can you provide a quick explanation of why the figures are so different? TA

Let me try, I will have to be brief.

The Uni Hamburg data is based on a algorithm (specific calculation) called ASI (stands for ASI Sea Ice). Measurements are from the AMSR2 satellite instrument provided by Jaxa.

The NSIDC data is based on a different algorithm called Nasa Team and uses measurements from instruments SMMR, SSM/I and SSMS on several US satellites.

For completeness the Jaxa/ADS data use another algorithm (Bootstrap) and measurements are from the AMSR2 instrument.

There are more algorithms, each with its specific advantages and disadvantages. The ASI algorithm has the highest resolution, the NSIDC has the longest timespan (end 1978-present) and Jaxa/ADS may be the most accurate available.

Now the NSIDC algorithm is known to underestimate sea ice concentration, especially during the melting season. This explains your observation as concentration directly influences area . Extent is less affected because extent includes all grid cells with >15% concentration fully (100%), only for marginal ice it will make a difference.

There is a nice set of comparative sea ice concentration pages from UCAR/NCAR:

https://climatedataguide.ucar.edu/variables/cryosphere/sea-ice-concentration

 

3
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 23, 2017, 08:46:36 AM »
Hmm, rather slow day?

Update 20170722.

Extent: -25.0 (+34k vs 2016, -182k vs 2015, -408k vs 2014, -132k vs 2013, +65k vs 2012)
Area: -43.1 (+376k vs 2016, +156k vs 2015, -273k vs 2014, -135k vs 2013, +254k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    0.6                   -11.5                    -8.6
               Kara Sea             Barents Sea           Greenland Sea
                    6.8                    -1.2                   -13.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    0.3                     0.0                    -5.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    2.9                     7.3                    -1.6
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.2                    -0.5                   -25.0

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -4.2                     3.5                   -11.2
               Kara Sea             Barents Sea           Greenland Sea
                   -0.2                    -1.6                    -8.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -0.1                     0.0                    -5.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -5.9                     4.1                   -13.1
             Bering Sea          Sea of Okhotsk              Total Area
                    0.1                    -0.4                   -43.1


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%.

4
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 22, 2017, 07:16:00 PM »
The ice in Kara shows how fast it can disappear suddenly.

5
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 22, 2017, 07:07:40 PM »
Big drops, finally Laptev is seriously getting rid of all that ice. Greenland Sea extent continues to go down.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-21 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4419.2   +6.6   -11.1    462.4  -25.9  -364.9    440.2  -75.3  -129.4
               Kara Sea             Barents Sea           Greenland Sea
   144.6  -25.7  -415.9     57.8   -5.1  -110.1    225.0  -53.1  -185.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   314.6  -10.6   -39.7      6.8   -1.6    +6.8    175.2   -1.2  -141.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   577.2  +14.2   -83.6    267.1  +28.4  -120.0    125.1   -2.6  -207.4
             Bering Sea          Sea of Okhotsk                   Lakes
     4.2   -1.3    -1.2     20.3   +1.0   +20.3    172.5   +5.5   +43.3
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7242.6 -152.1 -1780.1

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3463.6  -86.6  -249.5    233.5  -10.2  -303.0    242.5  -35.1  -114.6
               Kara Sea             Barents Sea           Greenland Sea
    70.4  -15.7  -271.1     16.5   -2.6   -57.4    117.0   -2.2   -80.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   136.1  -10.0   -20.9      1.7   -0.9    +1.7     66.1   +1.6   -72.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   379.0  -12.6   -63.4    153.9   +5.5   -94.6     51.1   +0.9  -147.5
             Bering Sea          Sea of Okhotsk                   Lakes
     0.7   -0.3    -0.7      4.4   +0.1    +4.4     93.3   -1.4   +36.4
          Other regions       Total (ex. lakes)
     2.2   -0.1    +2.2   4938.7 -168.2 -1466.9


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%.

6
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 22, 2017, 06:56:59 PM »
The race in extent continues. Area now in lowest 4th place.

Update 20170721.

Extent: -86.6 (-72k vs 2016, -304k vs 2015, -427k vs 2014, -207k vs 2013, -36k vs 2012)
Area: -56.7 (+306k vs 2016, +24k vs 2015, -356k vs 2014, -173k vs 2013, +307k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -9.5                   -22.8                   -18.1
               Kara Sea             Barents Sea           Greenland Sea
                  -12.6                    -3.4                   -10.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -10.9                     0.1                    -7.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    2.6                     8.7                    -3.3
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.2                     0.2                   -86.6

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -75.2                    14.7                     2.9
               Kara Sea             Barents Sea           Greenland Sea
                   -8.5                    -5.0                    15.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -10.7                     0.1                    -5.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    3.6                     0.5                    10.6
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.2                     0.1                   -56.7



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%.

7
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 21, 2017, 07:27:13 PM »
Most of the drop in Kara, followed by Kara CAA and the Greenland Sea. The drop in the CAA is of course not to be taken too seriously.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-20 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4412.7  -13.1   -19.0    488.3  -11.5  -347.3    515.4   +3.6   -66.7
               Kara Sea             Barents Sea           Greenland Sea
   170.3  -63.7  -403.3     62.9  +10.2  -112.3    278.1  -28.3  -139.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   325.2  -10.5   -42.2      8.3   +2.1    +8.3    176.4  +11.4  -159.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   563.0  -37.8  -104.4    238.8   +7.0  -150.6    127.7   +7.6  -209.6
             Bering Sea          Sea of Okhotsk                   Lakes
     5.4   +1.9    -0.1     19.3   -2.0   +19.3    167.0   -1.2   +38.7
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7394.8 -123.1 -1724.4

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3550.1  -71.6  -165.4    243.7   -8.8  -301.2    277.5   -5.3   -90.0
               Kara Sea             Barents Sea           Greenland Sea
    86.2  -22.5  -264.9     19.1   -0.6   -57.7    119.2  -24.1   -82.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   146.2   -2.3   -19.1      2.6   +1.0    +2.6     64.5   +2.7   -83.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   391.6  -14.8   -61.1    148.4   -7.0  -100.6     50.2   +1.8  -152.5
             Bering Sea          Sea of Okhotsk                   Lakes
     1.0   +0.0    -0.4      4.3   -1.6    +4.3     94.7   +6.8   +37.6
          Other regions       Total (ex. lakes)
     2.2   -0.0    +2.2   5106.9 -153.1 -1369.7


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%.

8
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 21, 2017, 06:09:52 PM »
Animation compares the ice concentration in the Greenland Sea with 2016. You can see the mobile ice melting away quick. Less fast ice on the East Greenland coast and more ice around Svalbard in 2017.

Click to start the animation.

9
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 21, 2017, 06:04:38 PM »
A century extent drop makes 2017 extent lowest for the day, just below 2016 and 2012. Kara and Greenland Sea contribute most.

Update 20170720.

Extent: -114.6 (-56k vs 2016, -327k vs 2015, -418k vs 2014, -238k vs 2013, -35k vs 2012)
Area: -56.1 (+373k vs 2016, -77k vs 2015, -380k vs 2014, -199k vs 2013, +135k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -5.9                   -11.6                    -5.5
               Kara Sea             Barents Sea           Greenland Sea
                  -38.6                    -0.3                   -41.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -8.8                    -0.1                    -1.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -7.2                     2.4                     3.7
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.0                    -0.1                  -114.6

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   16.6                   -18.2                    10.9
               Kara Sea             Barents Sea           Greenland Sea
                  -17.0                    -3.8                   -26.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -22.2                    -0.1                     0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    7.9                    -1.3                    -2.5
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.0                   -56.1


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%.

10
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 20, 2017, 06:22:56 PM »
A regional area century loss for the CAB today. Also notice the Greenland Sea extent. GS can be noisy, but UH AMSR2 sees the same drop there.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-19 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4425.8   -4.6    -7.0    499.8  -12.7  -341.2    511.8  -22.3   -77.6
               Kara Sea             Barents Sea           Greenland Sea
   234.1   -9.6  -350.9     52.7   +0.6  -129.5    306.3  -53.8  -117.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   335.8  +27.8   -47.4      6.2   -2.6    +6.2    165.0   -5.4  -189.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   600.8  -13.8   -71.3    231.7  -16.5  -160.7    120.1   +2.6  -223.0
             Bering Sea          Sea of Okhotsk                   Lakes
     3.6  -14.3    -1.9     21.9   +2.8   +21.9    168.1   +1.6   +39.6
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7518.4 -121.6 -1686.1

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3621.7 -110.6   -99.6    252.5  -14.4  -300.8    282.8  -13.4   -92.9
               Kara Sea             Barents Sea           Greenland Sea
   108.7   -5.6  -249.5     19.7   -0.9   -61.6    143.3   -9.6   -61.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   148.5   -5.4   -26.3      1.7   -0.4    +1.7     61.8   -2.0   -95.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   406.4   -3.2   -52.2    155.4   -7.7   -94.8     48.4   -5.1  -158.0
             Bering Sea          Sea of Okhotsk                   Lakes
     1.0   -2.9    -0.4      6.1   +0.6    +6.1     87.8   -2.0   +30.5
          Other regions       Total (ex. lakes)
     2.3   +0.1    +2.3   5260.2 -180.5 -1283.0


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%.

11
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 20, 2017, 03:16:35 PM »
Animation of Beaufort ice concentration, compared with 2016. This was the time when "Big Block" broke last year. No need for that now, the blocks are much smaller.

The animation will not start unless you click.

12
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 20, 2017, 03:11:56 PM »
Drops in extent and area are big enough to stay close with 2012 and 2016. The ice in the Greenland Sea is dropping because the lack of Fram transport.

Update 20170719.

Extent: -89.3 (-40k vs 2016, -314k vs 2015, -381k vs 2014, -163k vs 2013, +38k vs 2012)
Area: -95.1 (+347k vs 2016, -102k vs 2015, -416k vs 2014, -195k vs 2013, -46k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -2.0                    -6.5                   -14.5
               Kara Sea             Barents Sea           Greenland Sea
                  -12.9                    -5.5                   -23.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -7.3                     0.0                    -0.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.0                    -7.4                    -0.6
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.1                    -0.1                   -89.3

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   29.9                   -17.7                   -13.8
               Kara Sea             Barents Sea           Greenland Sea
                  -22.6                     0.6                   -27.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -27.8                     0.0                    -2.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -2.0                     0.0                   -11.8
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.1                     0.0                   -95.1



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%.

13
Arctic sea ice / Re: Latest PIOMAS update (mid July update)
« on: July 19, 2017, 07:15:19 PM »
Fram daily export was more negative than positive in the first 15 days in July. IOW it was more like import, all according to the PIOMAS model.

14
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 19, 2017, 07:09:14 PM »
Back in the fat centuries. The remaining ice in the Baffin region is taking a hit. CAB lost 60k in area.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-18 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4430.4   -4.6    -2.5    512.5   -3.3  -335.7    534.0   -5.1   -63.5
               Kara Sea             Barents Sea           Greenland Sea
   243.6   +0.5  -356.5     52.0  -17.0  -137.1    360.1   -0.9   -71.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   308.0  -20.3   -89.4      8.8   +1.1    +8.8    170.3  -51.6  -202.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   614.6   -3.3   -59.9    248.2  -14.6  -147.9    117.4   -9.6  -232.9
             Bering Sea          Sea of Okhotsk                   Lakes
    17.9   +4.7   +12.5     19.1   -1.2   +19.1    166.5  -24.0   +41.3
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7640.0 -125.3 -1655.5

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3732.3  -58.5    +5.9    266.9  -20.5  -299.0    296.2   -6.0   -89.0
               Kara Sea             Barents Sea           Greenland Sea
   114.2   -5.5  -255.7     20.6   -6.3   -65.4    152.9   -3.3   -55.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   153.9  -26.9   -29.3      2.1   +0.5    +2.1     63.8  -30.2  -101.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   409.6   -8.5   -51.9    163.2   -5.8   -93.6     53.5  -13.5  -158.8
             Bering Sea          Sea of Okhotsk                   Lakes
     3.9   +1.1    +2.5      5.4   +0.7    +5.4     89.9   -6.9   +33.9
          Other regions       Total (ex. lakes)
     2.2   +0.0    +2.2   5440.7 -182.4 -1182.3


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%.

15
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 19, 2017, 09:04:33 AM »
Ice in about all possible NW passages turns mobile.

16
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 19, 2017, 09:00:50 AM »
Continuing declines, typical for the time of year. Sea ice concentration drops in Laptev, ESS and Chukchi.

Update 20170718.

Extent: -85.3 (-54k vs 2016, -367k vs 2015, -314k vs 2014, -101k vs 2013, +108k vs 2012)
Area: -101.2 (+266k vs 2016, -94k vs 2015, -378k vs 2014, -175k vs 2013, +109k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -7.8                    -1.8                    -2.9
               Kara Sea             Barents Sea           Greenland Sea
                   -5.2                    -6.4                    -2.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -9.0                     0.0                   -15.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.3                   -13.8                   -11.2
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.3                     0.6                   -85.3

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   12.0                   -30.6                   -19.3
               Kara Sea             Barents Sea           Greenland Sea
                   -6.1                    -5.0                    -6.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   20.8                     0.0                   -24.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -13.6                    -6.8                   -21.4
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.1                     0.5                  -101.2


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%.

17
Greenland and Arctic Circle / Re: Greenland 2017 melt season
« on: July 19, 2017, 08:06:41 AM »
Fast Ice in NORD un-fastens (after a click).

18
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 18, 2017, 07:21:01 PM »
Small extent drop, and an uptick in area. The extent is affected by a particular large increase over Hudson, not likely to be real.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-17 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4435.0   -3.9    +0.1    515.8   +1.6  -342.1    539.2  -11.7   -69.6
               Kara Sea             Barents Sea           Greenland Sea
   243.2  -46.7  -371.3     69.0   -4.5  -126.2    361.0  -13.8   -75.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   328.3   -4.3   -81.9      7.8   +2.6    +7.8    221.9  +44.7  -172.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   617.9  +24.5   -60.8    262.9   -9.5  -137.0    127.0  -21.7  -227.8
             Bering Sea          Sea of Okhotsk                   Lakes
    13.2   +8.4    +8.6     20.2   +6.0   +20.2    190.5   -0.7   +64.7
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7765.3  -28.5 -1624.9

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3790.8  +27.5   +47.7    287.4  -12.3  -291.4    302.1   -2.1   -88.5
               Kara Sea             Barents Sea           Greenland Sea
   119.7  -18.0  -259.7     26.9   -7.6   -62.7    156.2   -6.7   -57.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   180.8   +3.2   -11.7      1.5   +0.4    +1.5     94.0  +19.5   -82.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   418.0  +17.0   -54.9    169.0   +0.0   -91.3     66.9  -10.5  -152.1
             Bering Sea          Sea of Okhotsk                   Lakes
     2.8   +1.6    +1.6      4.7   +1.6    +4.7     96.8   -2.7   +40.7
          Other regions       Total (ex. lakes)
     2.2   -0.0    +2.2   5623.1  +13.7 -1094.6


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%.

19
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 18, 2017, 06:54:07 PM »
Extent drop same as yesterday (~75k), area just a small 15k.

Update 20170717.

Extent: -74.4 (-20k vs 2016, -415k vs 2015, -287k vs 2014, -113k vs 2013, +105k vs 2012)
Area: -15.7 (+268k vs 2016, -120k vs 2015, -393k vs 2014, -184k vs 2013, +207k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -2.8                   -16.0                    -7.1
               Kara Sea             Barents Sea           Greenland Sea
                  -11.9                     2.4                   -13.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    3.5                     0.1                    -0.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -7.6                    -5.0                   -16.1
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.2                    -0.3                   -74.4

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   12.7                   -10.8                    -4.2
               Kara Sea             Barents Sea           Greenland Sea
                   -4.5                     1.3                   -14.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -4.0                     0.1                     8.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.1                     6.0                     3.0
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.2                    -0.2                   -15.7


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%.

The detail is the "Barents Bite". Good eyes may spot that some polynya are getting resolved (by the excellent UH sea ice concentration product) for the first time. Single (red) pixels for now, nothing like 2013 yest.

20
Arctic sea ice / Re: Latest PIOMAS update (mid July update)
« on: July 18, 2017, 12:06:16 PM »
My estimated total volume on July 1-15:

[EDIT: last day was missing (spotted by oren)]
array([ 11.953,  11.734,  11.52 ,  11.309,  11.102,  10.916,  10.686,
        10.437,  10.239,  10.068,   9.894,   9.709,   9.527,   9.28 ,
         9.049])

Updated egional daily data file is here:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional.txt.gz

21
Arctic sea ice / Re: Latest PIOMAS update (mid July update)
« on: July 18, 2017, 11:57:56 AM »
Updated daily volume and daily volume anomaly graphs.

22
Arctic sea ice / Re: Latest PIOMAS update (mid July update)
« on: July 18, 2017, 08:45:28 AM »
Mid month update of gridded daily data has arrived.

The volume gap with 2012 is still there, it is still small (0.15 [1000 km3]).

Here is the animation, more info later today.

23
Antarctica / Re: Sea Ice Extent around Antarctica
« on: July 17, 2017, 04:29:41 PM »
Also area has taken the lowest position. Looking at the graphs, extent will likely stay lowest a bit longer, area probably not.

extent SH
1985-07-16 15.775432
1995-07-16 15.732109
1980-07-16 15.615618
1989-07-16 15.592934
1990-07-16 15.502736
1986-07-16 15.480906
2002-07-16 15.480702
1983-07-16 15.480661
1991-07-16 15.451098
2017-07-16 15.024859

area SH
1982-07-16 12.455222
1995-07-16 12.433007
1986-07-16 12.352278
2001-07-16 12.349878
1987-07-16 12.341766
2011-07-16 12.240798
1990-07-16 12.224225
1991-07-16 12.200350
1980-07-16 12.178648
2017-07-16 12.141301

24
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 17, 2017, 04:14:45 PM »
Moderate extent drop and almost no net change in area.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-16 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4438.9   -2.0    +2.8    514.2  -10.7  -347.5    550.9   -1.7   -65.1
               Kara Sea             Barents Sea           Greenland Sea
   289.9  -12.7  -330.1     73.5   -9.9  -129.3    374.9  -24.9   -70.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   332.6   -7.4   -90.0      5.2   -2.1    +5.2    177.3   -5.1  -237.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   593.4  +12.7   -87.7    272.4   +8.8  -131.2    148.7   -3.9  -210.9
             Bering Sea          Sea of Okhotsk                   Lakes
     4.8   -3.6    -0.3     14.2   -1.1   +14.2    191.1  +35.1   +63.0
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7793.8  -63.6 -1674.7

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3763.3   +3.3   +10.0    299.7   +3.4  -290.1    304.2  -16.4   -95.2
               Kara Sea             Barents Sea           Greenland Sea
   137.7  -10.4  -249.1     34.5   +2.0   -59.7    162.9   -9.4   -54.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   177.6   +0.0   -23.2      1.1   -0.5    +1.1     74.5   -1.7  -113.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   401.0   +8.2   -82.3    169.0  +15.7   -98.9     77.4   +2.2  -149.9
             Bering Sea          Sea of Okhotsk                   Lakes
     1.2   -0.3    -0.1      3.0   -0.4    +3.0     99.5   +9.2   +41.5
          Other regions       Total (ex. lakes)
     2.2   +0.0    +2.2   5609.4   -4.2 -1200.2


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%.

25
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 17, 2017, 09:01:12 AM »

rebounds in ESS and Chukchi.


Yes - but that just seems to be the wrong word, somehow. It implies a strengthening or improvement in the state of the ice. Considering the direction it's headed and what's going to happen to it when it gets there, perhaps "diffusion" would be a better term?

My intended meaning was that extent rebounds, more specifically the extent as measured.

Like all measurements, those of extent and area do not perfectly match what we like them to be and must be interpreted. I think the chance that ice rebounded somehow is zero.

26
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 17, 2017, 08:52:07 AM »
No Fram export to speak of. Some of the fast ice has chipped off.

27
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 17, 2017, 08:49:21 AM »
Moderate declines but extent closes the distance with 2012 and 2016.

Update 20170716.

Extent: -74.6 (+55k vs 2016, -486k vs 2015, -262k vs 2014, -147k vs 2013, +84k vs 2012)
Area: -57.0 (+242k vs 2016, -227k vs 2015, -401k vs 2014, -235k vs 2013, +91k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -12.5                    -2.4                    -4.9
               Kara Sea             Barents Sea           Greenland Sea
                  -22.1                     3.9                    -2.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -19.3                     0.0                    -7.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -9.5                     3.3                    -0.7
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.2                    -0.6                   -74.6

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -49.4                    29.2                     6.7
               Kara Sea             Barents Sea           Greenland Sea
                  -21.4                     8.7                    -3.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -20.7                     0.0                     0.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -34.5                    13.2                    14.4
             Bering Sea          Sea of Okhotsk              Total Area
                    0.3                    -0.3                   -57.0


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%.

28
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 16, 2017, 06:54:39 PM »
Very mixed picture. Large extent drops in Kara but rebounds in ESS and Chukchi. While UH AMSR2 "saw" concentration drops on the pacific side, the NSIDC ice concentration is declining on the Atlantic half of the ice pack.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-15 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4440.9   +1.3    +3.9    524.9  +46.3  -347.7    552.6   -7.2   -69.2
               Kara Sea             Barents Sea           Greenland Sea
   302.6  -82.9  -326.5     83.4   -3.8  -127.5    399.8  -41.0   -53.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   340.0   -1.8   -94.8      7.3   +4.2    +7.3    182.4  -15.3  -255.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   580.7  -16.5  -100.1    263.5  +19.7  -143.0    152.6  +22.8  -213.7
             Bering Sea          Sea of Okhotsk                   Lakes
     8.4   +0.0    +3.5     15.3   +1.1   +15.3    156.0  -15.0   +24.5
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7857.4  -73.0 -1698.1

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3760.0  -81.1    +9.7    296.3  +14.3  -310.6    320.6  -24.5   -86.9
               Kara Sea             Barents Sea           Greenland Sea
   148.1  -35.9  -244.2     32.5   -2.3   -66.5    172.3  -24.8   -50.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   177.6   +2.0   -33.9      1.7   +0.8    +1.7     76.2   -6.7  -125.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   392.8  -10.0   -94.0    153.3   +3.0  -120.7     75.2   +4.5  -159.9
             Bering Sea          Sea of Okhotsk                   Lakes
     1.4   -0.1    +0.2      3.4   -0.1    +3.4     90.4   -0.1   +32.0
          Other regions       Total (ex. lakes)
     2.2   -0.1    +2.2   5613.6 -161.1 -1275.5


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%.

29
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 16, 2017, 09:14:01 AM »
The decline of the ice in Kara continues, more than half of the total extent drop is due to Kara. Further the concentration losses along the Chukchi/Beaufort ice edge can be mentioned.

Update 20170715.

Extent: -92.1 (+76k vs 2016, -566k vs 2015, -251k vs 2014, -166k vs 2013, +126k vs 2012)
Area: -119.0 (+207k vs 2016, -303k vs 2015, -401k vs 2014, -216k vs 2013, +62k vs 2012)
 
The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -9.5                     9.4                   -14.0
               Kara Sea             Barents Sea           Greenland Sea
                  -50.3                   -11.9                    -4.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -4.9                     0.0                    -5.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -3.1                     0.8                     1.1
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.7                     0.0                   -92.1

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -23.2                    -6.7                   -15.9
               Kara Sea             Barents Sea           Greenland Sea
                  -22.4                   -11.9                    20.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -3.6                     0.0                    -6.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    8.1                   -24.1                   -32.8
             Bering Sea          Sea of Okhotsk              Total Area
                    0.6                    -0.2                  -119.0


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%.

30
For fun: two melt ponds on the Zachariae Isstrøm, one seems to drain into the other.

31
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 15, 2017, 03:42:03 PM »
Big drops in extent and area again. The drops in Kara are biggest where the ice caught  by Novaya Zemlya is disappearing. ESS rebounded somewhat, not unexpected after two consecutive days with a century.


Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-14 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4439.6   -3.9    +2.3    478.6  +31.9  -396.2    559.7   -0.6   -69.4
               Kara Sea             Barents Sea           Greenland Sea
   385.5  -66.0  -265.9     87.2   +5.6  -135.3    440.8   -5.9   -24.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   341.9  -16.6  -106.6      3.1   -6.3    +3.1    197.7   +6.9  -266.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   597.2  -32.4   -87.3    243.9  -36.0  -165.6    129.7  -19.7  -242.4
             Bering Sea          Sea of Okhotsk                   Lakes
     8.4   -1.2    +3.3     14.3   -0.5   +14.3    171.0  +32.6   +40.3
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   7930.4 -144.8 -1733.8

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3841.1  -22.2   +88.9    282.0   +0.8  -336.9    345.2   -6.0   -67.6
               Kara Sea             Barents Sea           Greenland Sea
   184.0  -24.8  -219.0     34.8  -12.7   -71.0    197.1  -11.3   -31.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   175.6  -17.6   -45.4      0.9   -1.5    +0.9     82.9   +2.3  -130.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   402.8  -21.6   -89.5    150.3  -27.5  -129.5     70.7  -15.7  -170.2
             Bering Sea          Sea of Okhotsk                   Lakes
     1.6   -0.2    +0.3      3.5   -0.4    +3.5     90.6   +5.7   +32.1
          Other regions       Total (ex. lakes)
     2.3   +0.1    +2.3   5774.8 -158.3 -1194.9


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%.

32
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 15, 2017, 09:16:28 AM »
Back to sub-century declines. Most of it in the Kara region, Chukchi adds some to yesterday's retreat.

Update 20170714.

Extent: -97.7 (+85k vs 2016, -553k vs 2015, -218k vs 2014, -199k vs 2013, +151k vs 2012)
Area: -74.6 (+193k vs 2016, -367k vs 2015, -317k vs 2014, -130k vs 2013, +218k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    1.2                    -6.4                    -9.2
               Kara Sea             Barents Sea           Greenland Sea
                  -27.7                    -9.7                    -0.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -13.2                     0.0                    -9.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -3.6                    -1.1                   -18.5
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.1                     0.1                   -97.7

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -12.8                   -10.4                   -15.5
               Kara Sea             Barents Sea           Greenland Sea
                  -12.1                   -17.0                    -3.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -7.4                     0.0                    -6.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    7.7                     7.0                    -4.4
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.1                   -74.6


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%.

33
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 14, 2017, 07:01:30 PM »
Basin-only update. The extent decline accelerated and is now back to the lowest position (shared with 2011). Area is not particularly low among recent years.

34
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 14, 2017, 06:06:17 PM »
(near) double centuries for extent and area,  ESS scores a regional century (again). Laptev declines the invitation.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-13 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4443.5   +0.0    +5.6    446.7 -135.5  -431.2    560.4  +36.2   -74.1
               Kara Sea             Barents Sea           Greenland Sea
   451.5  -18.0  -217.2     81.5  -13.0  -146.2    446.6   +4.1   -26.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   358.4  -29.1  -100.9      9.4   -0.0    +9.4    190.8  -15.5  -291.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   629.6   -1.3   -58.5    279.9   +8.8  -135.0    149.5  -43.6  -226.0
             Bering Sea          Sea of Okhotsk                   Lakes
     9.6   +7.8    +4.9     14.8   +0.6   +14.8    137.9  -10.3    +2.8
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   8075.2 -198.5 -1669.3

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3863.3  -55.6  +109.4    281.3  -72.2  -344.9    351.1  +12.8   -71.0
               Kara Sea             Barents Sea           Greenland Sea
   208.7  -16.0  -202.4     47.6   +1.3   -62.3    208.4   -2.6   -25.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   193.2  -18.4   -37.3      2.4   -0.2    +2.4     80.5   -9.3  -142.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   424.4  -16.7   -71.7    177.7   -0.4  -107.5     86.4  -24.8  -160.9
             Bering Sea          Sea of Okhotsk                   Lakes
     1.8   +1.5    +0.6      3.9   +0.3    +3.9     84.8  -17.3   +24.2
          Other regions       Total (ex. lakes)
     2.2   +0.1    +2.2   5933.1 -200.3 -1108.1


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%.

35
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 14, 2017, 12:55:58 PM »
Animated Canadian Archipelago. Some ice in the main channel (Barrow Strait) has "mobilized".

36
A relatively narrow calving is unstable: the calvings topple over.

37
Antarctica / Re: PIG has calved
« on: July 14, 2017, 12:36:31 PM »
Wipneus

What's the scale of this incipient event, relative to the Larsen C calving?

This one is 10m per pixel. So this image is 7kmx7km.
I do expect the eventual calving to be bigger than this, but nothing like Larsen C. The PIG calves far more often though, when the big crack (see my posting on 7/7) goes it will be the third big calving in the history of this thread.

38
Antarctica / Re: PIG has calved
« on: July 14, 2017, 11:58:16 AM »
See my previous post on the 7th for an overview. This can not last long.

39
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 14, 2017, 08:59:21 AM »
Continuing ice cover losses in the Eurasian coastal regions (perhaps except Laptev). The ice around Wrangel island is particular affected.

Update 20170713.

Extent: -142.8 (+85k vs 2016, -531k vs 2015, -154k vs 2014, -209k vs 2013, +162k vs 2012)
Area: -102.5 (+138k vs 2016, -265k vs 2015, -253k vs 2014, -148k vs 2013, +215k vs 2012)
 
The details (in 1000 km2):

Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    0.9                   -47.2                     4.6
               Kara Sea             Barents Sea           Greenland Sea
                  -34.8                     2.1                   -12.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -8.5                    -0.1                    -8.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -15.6                     2.2                   -26.0
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.2                     0.1                  -142.8

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                    8.2                   -42.3                    -9.4
               Kara Sea             Barents Sea           Greenland Sea
                  -35.3                     8.1                     4.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -10.7                    -0.1                    -9.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -10.4                     9.4                   -14.2
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.1                     0.0                  -102.5



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%.

40
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 13, 2017, 05:53:57 PM »
The disappearing ice in the ESS animated.

41
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 13, 2017, 05:48:56 PM »
Remarkable regional century for the ESS.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-12 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4443.5   -5.9    +5.5    582.3 -117.6  -301.9    524.2  +15.2  -118.8
               Kara Sea             Barents Sea           Greenland Sea
   469.5   -3.1  -213.5     94.6   +5.2  -140.3    442.5  -18.6   -36.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   387.5   +6.5   -85.9      9.4   +1.0    +9.4    206.3  -17.6  -301.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   630.9   -7.7   -56.9    271.1   +6.3  -148.2    193.1  -17.0  -187.8
             Bering Sea          Sea of Okhotsk                   Lakes
     1.8   -3.0    -3.2     14.2   -4.5   +14.2    148.2  +27.3   +15.4
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   8273.7 -160.7 -1562.5

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3918.9   -9.1  +154.9    353.5  -53.7  -280.8    338.4   +1.5   -93.6
               Kara Sea             Barents Sea           Greenland Sea
   224.8   +4.9  -196.5     46.3   +2.0   -67.8    211.0  -15.2   -28.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   211.6   -3.0   -27.8      2.6   +0.5    +2.6     89.8   -6.8  -149.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   441.1   +0.2   -55.2    178.1   +2.5  -112.4    111.3  -10.3  -142.5
             Bering Sea          Sea of Okhotsk                   Lakes
     0.3   -0.8    -0.9      3.6   -2.5    +3.6    102.3  +28.1   +41.9
          Other regions       Total (ex. lakes)
     2.1   +0.1    +2.1   6133.3  -89.6  -992.3


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%.

42
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 13, 2017, 08:18:37 AM »
Mighty extent drop in the ESS is the most remarkable number today.

Update 20170712.

Extent: -141.4 (+100k vs 2016, -535k vs 2015, -44k vs 2014, -139k vs 2013, +275k vs 2012)
Area: -50.5 (+200k vs 2016, -224k vs 2015, -231k vs 2014, -157k vs 2013, +195k vs 2012)
 

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -9.6                   -81.9                    -3.7
               Kara Sea             Barents Sea           Greenland Sea
                   -0.1                    -1.2                   -17.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -7.0                     0.0                     2.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -8.7                    -4.5                    -9.4
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.3                     0.2                  -141.4

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   11.4                   -25.9                   -13.4
               Kara Sea             Barents Sea           Greenland Sea
                    6.7                     1.5                   -10.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -11.5                     0.0                     4.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -6.2                     3.1                    -9.9
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.2                     0.2                   -50.5



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%.

43
One of Zachariae's old calvings decides to do something dramatic.

44
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 12, 2017, 02:29:55 PM »
Yes, like the "homebrew" AMSR2  data, NSIDC shows a lot of extent and/or area losses all along the Eurasian coastal regions, especially Laptev.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-11 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4449.4   -5.2   +10.6    699.9  -20.8  -188.5    508.9  -70.8  -137.7
               Kara Sea             Barents Sea           Greenland Sea
   472.6  -37.6  -222.9     89.4   -3.2  -149.7    461.1   -1.6   -27.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   381.0  -13.6  -105.4      8.3   -3.1    +8.3    223.9   -3.1  -309.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   638.6   -4.4   -51.9    264.7   +1.3  -155.9    210.0   -3.7  -174.7
             Bering Sea          Sea of Okhotsk                   Lakes
     4.8   +0.0    +0.0     18.7   +8.8   +18.7    120.0  -36.2   -11.2
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   8434.4 -156.9 -1483.5

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3928.0  +20.9  +141.4    407.2   -5.4  -229.5    336.9  -57.4  -101.9
               Kara Sea             Barents Sea           Greenland Sea
   219.9  -34.9  -211.1     44.3   -2.9   -73.9    226.2   -5.0   -16.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   214.6   -0.7   -36.0      2.0   -0.9    +2.0     96.6   -1.2  -159.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   440.9  +14.7   -59.2    175.6  +10.5  -120.3    121.6   +4.8  -137.8
             Bering Sea          Sea of Okhotsk                   Lakes
     1.1   -0.1    -0.1      6.0   +3.7    +6.0     73.8  -12.2   +14.2
          Other regions       Total (ex. lakes)
     2.0   +0.0    +2.0   6223.0  -53.6  -994.9


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%.

45
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 12, 2017, 08:25:57 AM »
Back in the centuries. Ice in the Kara/Laptev/ESS is taking a particular hard hit.

Update 20170711.

Extent: -113.2 (+119k vs 2016, -455k vs 2015, -10k vs 2014, -152k vs 2013, +391k vs 2012)
Area: -105.9 (+196k vs 2016, -251k vs 2015, -278k vs 2014, -185k vs 2013, +271k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -2.0                   -19.3                   -27.3
               Kara Sea             Barents Sea           Greenland Sea
                  -38.6                     0.9                     5.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -17.7                     0.0                    -6.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    1.7                    -7.1                    -3.0
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.2                     0.0                  -113.2

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -27.4                    -7.3                   -11.5
               Kara Sea             Barents Sea           Greenland Sea
                  -33.2                     3.0                     2.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                  -15.6                     0.0                    -5.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    7.1                   -23.8                     5.9
             Bering Sea          Sea of Okhotsk              Total Area
                    0.2                     0.1                  -105.9


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%.

46
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 11, 2017, 06:43:36 PM »
Smallish extent drop and an area increase again.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-10 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4454.6   -1.3   +15.6    720.7   -2.6  -171.5    579.7  -24.5   -71.6
               Kara Sea             Barents Sea           Greenland Sea
   510.2  -16.9  -192.9     92.6  -10.1  -154.4    462.7  -13.6   -37.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   394.6   -8.7  -106.5     11.4   +4.7   +11.4    227.0   -8.5  -330.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   643.0  +30.7   -47.9    263.5  -10.1  -161.4    213.8   +3.7  -178.3
             Bering Sea          Sea of Okhotsk                   Lakes
     4.8   -2.4    +0.2     10.4   -6.0   +10.4    156.2   -2.7   +23.6
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   8591.9  -65.6 -1411.0

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3907.1  +97.0  +102.0    412.6   +5.4  -233.4    394.3  -39.8   -51.8
               Kara Sea             Barents Sea           Greenland Sea
   254.7  -11.9  -187.1     47.1   -2.4   -77.9    231.2  -15.4   -17.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   215.3  -17.8   -48.5      2.9   +1.1    +2.9     97.8   -2.7  -175.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   426.2  +27.4   -76.4    165.1   +0.8  -136.3    116.8   -0.4  -150.8
             Bering Sea          Sea of Okhotsk                   Lakes
     1.2   -0.5    -0.1      2.4   -1.4    +2.4     86.2   -4.6   +25.5
          Other regions       Total (ex. lakes)
     2.0   -0.1    +2.0   6276.7  +39.2 -1046.4


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%.

47
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 11, 2017, 08:18:19 AM »
Area drop exceeds that of extent, much of it in the Chukchi/ESS regions.

Update 20170710.

Extent: -88.6 (+109k vs 2016, -488k vs 2015, +10k vs 2014, -126k vs 2013, +410k vs 2012)
Area: -146.8 (+162k vs 2016, -242k vs 2015, -231k vs 2014, -242k vs 2013, +221k vs 2012)
 
The details (in 1000 km2):

Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -1.5                   -17.1                   -18.9
               Kara Sea             Barents Sea           Greenland Sea
                  -19.1                    -6.7                    -5.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -1.1                     0.0                    -9.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   -6.2                    -3.7                    -0.2
             Bering Sea          Sea of Okhotsk            Total Extent
                    0.1                     0.2                   -88.6

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -7.7                   -40.3                   -13.1
               Kara Sea             Barents Sea           Greenland Sea
                   -7.6                   -10.5                   -16.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                   -7.5                     0.0                    -6.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                  -19.4                     1.1                   -18.9
             Bering Sea          Sea of Okhotsk              Total Area
                    0.0                     0.2                  -146.8


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%.

48
Arctic sea ice / Re: 2017 sea ice area and extent data
« on: July 10, 2017, 03:40:04 PM »
Small extent drop and a big increase in area makes it feel like the end of August.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-07-09 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4455.9   +0.7   +15.7    723.4   -7.6  -172.4    604.2   +3.2   -53.5
               Kara Sea             Barents Sea           Greenland Sea
   527.0  -15.8  -189.5    102.7   +2.6  -152.3    476.3   -7.9   -31.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   403.3  +26.4  -108.4      6.8   +2.1    +6.8    235.5  -32.6  -346.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   612.3   -9.4   -83.1    273.5  +20.9  -154.3    210.0   -4.4  -185.2
             Bering Sea          Sea of Okhotsk                   Lakes
     7.2   -1.8    +2.2     16.4   +0.4   +16.4    158.8  -42.1   +24.3
          Other regions       Total (ex. lakes)
     2.9   +0.0    +2.9   8657.4  -23.2 -1432.7

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3810.1  +89.0   -13.2    407.3  -12.2  -248.9    434.0   +1.8   -22.4
               Kara Sea             Barents Sea           Greenland Sea
   266.7  -19.5  -186.4     49.6   +2.3   -81.6    246.6   -1.0    -7.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
   233.0  +11.3   -39.8      1.8   +0.5    +1.8    100.5  -13.8  -188.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   398.8   -9.5  -105.5    164.3  +33.8  -140.8    117.2   -3.1  -156.0
             Bering Sea          Sea of Okhotsk                   Lakes
     1.6   -0.3    +0.4      3.8   +0.2    +3.8     90.8  -12.3   +29.0
          Other regions       Total (ex. lakes)
     2.2   -0.1    +2.2   6237.5  +79.4 -1182.4


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%.

49
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 10, 2017, 08:28:37 AM »
Continuing area and extent drops. Third place is in danger being lost to 2014.

Update 20170709.

Extent: -67.3 (+131k vs 2016, -528k vs 2015, -10k vs 2014, -137k vs 2013, +323k vs 2012)
Area: -123.9 (+257k vs 2016, -254k vs 2015, -129k vs 2014, -232k vs 2013, +237k vs 2012)

The details (in 1000 km2):


Extent:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                   -4.7                   -15.4                    -2.9
               Kara Sea             Barents Sea           Greenland Sea
                  -26.9                    -1.2                   -17.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    4.6                     0.0                    -8.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                    5.0                     3.9                    -3.7
             Bering Sea          Sea of Okhotsk            Total Extent
                   -0.3                     0.1                   -67.3

Area:
   Central Arctic Basin       East Siberian Sea              Laptev Sea
                  -24.7                   -42.8                    -9.9
               Kara Sea             Barents Sea           Greenland Sea
                  -32.4                   -10.1                   -19.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
                    1.1                     0.0                    -5.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
                   13.8                     0.7                     5.5
             Bering Sea          Sea of Okhotsk              Total Area
                   -0.2                     0.1                  -123.9



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%.

50
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 09, 2017, 06:35:32 PM »
Fast ice in the Laptev Sea is mibilized.

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