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Wipneus

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Re: 2017 sea ice area and extent data
« Reply #400 on: August 14, 2017, 07:14:36 PM »
Extent losses in the CAA continue. Area gained in the CAB but quite a big loss in Laptev compensated that.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-13 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4080.0  -10.4  -291.1    189.2   +4.5  -404.0    235.9  -10.4  -121.0
               Kara Sea             Barents Sea           Greenland Sea
   130.6   -2.1  -214.0     14.8   -0.2   -52.3    129.2   +7.8  -150.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    81.3   -4.7   -38.0      0.0   +0.0    +0.0     31.2   -6.0   -99.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   358.2  -23.0  -168.2    114.4   -2.5  -207.0      3.7   +0.0  -189.9
             Bering Sea          Sea of Okhotsk                   Lakes
     6.5   +1.8    +6.5     17.6   -1.5   +17.6    167.8  +10.5   +35.6
          Other regions       Total (ex. lakes)
    16.2   -1.2   +16.2   5408.9  -48.0 -1895.1

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3002.6  +46.1  -599.4     98.4   +2.7  -260.3    146.5  -36.7   -63.8
               Kara Sea             Barents Sea           Greenland Sea
    54.6   -2.8  -139.4      4.4   -0.3   -22.7     49.1   +1.8   -78.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    30.0   -0.8   -18.9      0.0   +0.0    +0.0     10.5   -1.7   -34.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   231.7   -9.5   -70.6     61.1   +3.3  -114.1      1.0   -0.3   -97.1
             Bering Sea          Sea of Okhotsk                   Lakes
     1.9   +1.0    +1.9      6.5   +0.7    +6.5     89.2   +1.1   +30.1
          Other regions       Total (ex. lakes)
     9.3   -1.1    +9.3   3707.6   +2.4 -1481.6


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: 2017 sea ice area and extent data
« Reply #401 on: August 15, 2017, 06:19:31 PM »
Increases, both aea and extent. Biggest drop in the CAA for extent and CAB for area.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-14 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4082.6   +2.6  -284.8    181.5   -7.7  -396.1    241.0   +5.2  -109.8
               Kara Sea             Barents Sea           Greenland Sea
   130.8   +0.2  -207.3     16.8   +2.0   -49.9    127.9   -1.2  -151.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    63.2  -18.2   -53.0      0.0   +0.0    +0.0     35.4   +4.2   -85.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   404.3  +46.1  -115.5    107.4   -7.0  -210.9      4.3   +0.6  -182.3
             Bering Sea          Sea of Okhotsk                   Lakes
     2.9   -3.6    +2.9     18.6   +0.9   +18.6    143.2  -25.1    +7.8
          Other regions       Total (ex. lakes)
    14.5   -1.8   +14.5   5431.3  +22.3 -1810.3

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3031.2  +28.5  -572.6     90.5   -7.9  -259.3    142.9   -3.6   -65.1
               Kara Sea             Barents Sea           Greenland Sea
    53.5   -1.1  -137.7      4.7   +0.3   -21.4     49.3   +0.2   -77.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    23.0   -7.0   -24.0      0.0   +0.0    +0.0      8.9   -1.6   -32.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   243.2  +11.6   -54.3     59.2   -1.9  -114.2      1.0   +0.1   -93.4
             Bering Sea          Sea of Okhotsk                   Lakes
     1.1   -0.8    +1.1      6.1   -0.4    +6.1     82.0   -7.3   +21.0
          Other regions       Total (ex. lakes)
     9.3   -0.0    +9.3   3723.9  +16.3 -1435.7


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%.

CalamityCountdown

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Re: 2017 sea ice area and extent data
« Reply #402 on: August 15, 2017, 06:21:19 PM »
When I saw that the NSIDC reports for Arctic SIE decline for August 11th and 12th were both  over a century, I wondered if melting momentum had picked up for this month. Then, the 22 1000 km^2 gain today, made me change my mind. But the erratic results on a day to day basis reinforces for me why the NSIDC's most visible reports are based on 5 day averages. Further, looking at the daily data shows that an August day with a gain in Arctic SIE is not that unusual. Here are the dates with gains in SIE for selected years that ended up with low annual minimums

August 1 - 14
2007 - None
2012 - 8/4, 8/10
2016 - 8/4, 8/13
2017 - 8/5, 8/14

August 15 - 31
2007 - 8/26, 8/27
2012 - 8/30
2016 - 8/17, 8/22, 8/28
2017 - ?

Wipneus

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Re: 2017 sea ice area and extent data
« Reply #403 on: August 16, 2017, 06:51:15 PM »
CAA extent and area rebounded. Without it, it would have been a strong melt day.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-15 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4061.1  -21.6  -303.3    180.9   -0.6  -390.3    231.3   -9.7  -120.0
               Kara Sea             Barents Sea           Greenland Sea
    97.8  -33.0  -233.8     10.3   -6.5   -53.6    138.2  +10.3  -136.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    49.4  -13.7   -63.5      0.0   +0.0    +0.0     39.5   +4.0   -74.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   463.5  +59.2   -49.4     91.0  -16.4  -225.3      0.6   -3.7  -184.3
             Bering Sea          Sea of Okhotsk                   Lakes
     1.1   -1.8    +1.1     17.3   -1.2   +17.3    136.3   -6.8    +0.9
          Other regions       Total (ex. lakes)
    15.1   +0.6   +15.1   5397.2  -34.1 -1800.4

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3002.6  -28.5  -585.3     91.4   +0.8  -255.4    158.5  +15.6   -50.0
               Kara Sea             Barents Sea           Greenland Sea
    38.0  -15.5  -148.3      3.4   -1.3   -21.8     51.5   +2.2   -74.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    19.7   -3.4   -26.1      0.0   +0.0    +0.0     10.8   +1.9   -27.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   274.5  +31.2   -17.2     51.1   -8.1  -119.0      0.4   -0.6   -91.2
             Bering Sea          Sea of Okhotsk                   Lakes
     0.6   -0.6    +0.6      5.7   -0.3    +5.7     81.4   -0.6   +20.1
          Other regions       Total (ex. lakes)
     9.0   -0.3    +9.0   3717.1   -6.8 -1401.1


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%.

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Re: 2017 sea ice area and extent data
« Reply #404 on: August 16, 2017, 06:56:00 PM »
It looks an arctifact.
Be it or not, the CAA is headed for a serious end-of-season melt

Steven

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Re: 2017 sea ice area and extent data
« Reply #405 on: August 17, 2017, 02:17:22 PM »
NSIDC arctic sea ice area anomaly is now -1.40 million km2, which is 6th lowest for the date:




Average for the first half of August:


Wipneus

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Re: 2017 sea ice area and extent data
« Reply #406 on: August 17, 2017, 05:47:21 PM »
Extent losses in the CAB (Pacific side mostly) and Greenlands Sea

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-16 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3999.4  -61.7  -359.0    189.7   +8.8  -373.4    222.9   -8.4  -125.8
               Kara Sea             Barents Sea           Greenland Sea
    91.5   -6.3  -233.1     14.2   +3.9   -47.4    102.6  -35.6  -167.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    56.5   +7.1   -50.8      0.0   +0.0    +0.0     36.0   -3.4   -71.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   453.6   -9.9   -52.3     98.0   +7.0  -212.2      0.6   +0.0  -182.3
             Bering Sea          Sea of Okhotsk                   Lakes
     4.7   +3.5    +4.7     21.3   +4.0   +21.3    164.7  +27.9   +28.9
          Other regions       Total (ex. lakes)
    18.8   +3.2   +18.8   5309.9  -87.8 -1830.8

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2981.1  -21.5  -596.5     92.8   +1.5  -248.7    155.3   -3.2   -52.6
               Kara Sea             Barents Sea           Greenland Sea
    38.3   +0.3  -145.3      4.1   +0.7   -20.7     42.5   -9.0   -80.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    24.0   +4.3   -19.9      0.0   +0.0    +0.0      9.8   -1.0   -26.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   273.8   -0.7   -13.4     44.3   -6.9  -121.7      0.4   +0.0   -90.3
             Bering Sea          Sea of Okhotsk                   Lakes
     2.1   +1.5    +2.1      6.6   +0.9    +6.6     92.7  +11.3   +32.0
          Other regions       Total (ex. lakes)
    10.8   +1.7   +10.8   3686.0  -31.2 -1396.6


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: 2017 sea ice area and extent data
« Reply #407 on: August 18, 2017, 02:39:02 PM »
Nearly no net change in extent yet one and a half century drop in area.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-17 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3994.3   -5.1  -359.0    192.4   +2.6  -369.2    212.4  -10.4  -126.2
               Kara Sea             Barents Sea           Greenland Sea
    83.1   -8.4  -234.4     13.0   -1.2   -48.1    116.2  +13.6  -153.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    71.3  +14.8   -34.2      0.0   +0.0    +0.0     27.5   -8.5   -79.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   448.0   -5.6   -48.0    103.7   +5.7  -202.7      1.8   +1.2  -181.0
             Bering Sea          Sea of Okhotsk                   Lakes
     1.2   -3.5    +1.2     17.4   -3.9   +17.4    142.7  -22.1    +7.9
          Other regions       Total (ex. lakes)
    19.0   +0.2   +19.0   5301.3   -8.6 -1797.9

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2864.7 -116.3  -708.1     92.0   -0.8  -246.7    124.4  -31.0   -80.0
               Kara Sea             Barents Sea           Greenland Sea
    37.7   -0.6  -142.7      4.3   +0.2   -20.4     46.5   +4.0   -76.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    28.9   +4.9   -14.7      0.0   +0.0    +0.0      7.8   -2.0   -27.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   263.2  -10.5   -19.7     42.7   -1.6  -122.8      0.6   +0.2   -90.0
             Bering Sea          Sea of Okhotsk                   Lakes
     0.5   -1.6    +0.5      5.9   -0.7    +5.9     96.3   +3.6   +34.9
          Other regions       Total (ex. lakes)
    10.5   -0.3   +10.5   3529.8 -156.2 -1531.9


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: 2017 sea ice area and extent data
« Reply #408 on: August 19, 2017, 03:22:18 PM »
Small extent drop (mostly from the CAA) but a century area decline. The latter happened mostly in the CAB.

Date: 2017-08-18 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4015.7  +21.4  -333.2    190.3   -2.0  -362.8    204.0   -8.4  -130.6
               Kara Sea             Barents Sea           Greenland Sea
    83.1   +0.0  -226.8     19.3   +6.4   -40.7    129.5  +13.2  -135.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    54.7  -16.6   -48.8      0.0   +0.0    +0.0     29.9   +2.4   -71.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   405.2  -42.7   -83.0    109.4   +5.7  -196.9      3.1   +1.2  -176.5
             Bering Sea          Sea of Okhotsk                   Lakes
     2.4   +1.2    +2.4     19.5   +2.1   +19.5    141.2   -1.5    +4.5
          Other regions       Total (ex. lakes)
    14.6   -4.5   +14.6   5280.8  -20.5 -1769.9

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2790.7  -74.0  -788.3     86.6   -5.4  -250.1    125.1   +0.7   -76.9
               Kara Sea             Barents Sea           Greenland Sea
    36.8   -0.9  -138.7      5.2   +0.9   -19.0     51.7   +5.2   -69.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    23.1   -5.8   -19.3      0.0   +0.0    +0.0      8.4   +0.6   -25.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   231.5  -31.7   -48.3     42.3   -0.3  -125.0      0.8   +0.2   -89.8
             Bering Sea          Sea of Okhotsk                   Lakes
     1.4   +0.8    +1.4      5.7   -0.3    +5.7     86.3  -10.1   +25.4
          Other regions       Total (ex. lakes)
     9.2   -1.3    +9.2   3418.4 -111.4 -1634.2


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: 2017 sea ice area and extent data
« Reply #409 on: August 19, 2017, 03:36:07 PM »
Perhaps it is time for an update of the Basin only graphs.At the moment area seems more motivated to end among the lowest years than extent. For instance area is already below the September minimum reached in 2013 and 2014.

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Re: 2017 sea ice area and extent data
« Reply #410 on: August 20, 2017, 06:41:19 PM »
Little extent changes in the basin. Concentration in the CAB goes up and down in places, but gives a net loss of -34k.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-19 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  4018.3   +2.6  -324.6    189.1   -1.2  -348.9    193.6  -10.4  -136.1
               Kara Sea             Barents Sea           Greenland Sea
    78.1   -5.1  -225.2     15.7   -3.7   -43.1    100.7  -28.8  -159.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    59.6   +4.9   -40.3      0.0   +0.0    +0.0     34.2   +4.3   -66.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   448.6  +43.4   -33.9    105.6   -3.8  -200.3      1.2   -1.9  -176.3
             Bering Sea          Sea of Okhotsk                   Lakes
     4.7   +2.4    +4.7     18.6   -0.9   +18.6    144.1   +2.9    +4.4
          Other regions       Total (ex. lakes)
    16.2   +1.7   +16.2   5284.2   +3.4 -1715.3

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2756.6  -34.0  -834.2     86.4   -0.2  -245.0    128.2   +3.1   -71.8
               Kara Sea             Barents Sea           Greenland Sea
    36.4   -0.4  -134.4      5.1   -0.1   -18.6     42.0   -9.7   -77.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    26.3   +3.3   -14.8      0.0   +0.0    +0.0      9.2   +0.8   -24.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   239.6   +8.1   -37.1     42.0   -0.3  -125.0      0.6   -0.3   -89.8
             Bering Sea          Sea of Okhotsk                   Lakes
     2.0   +0.7    +2.0      6.0   +0.3    +6.0     87.2   +1.1   +24.7
          Other regions       Total (ex. lakes)
     9.3   +0.1    +9.3   3389.7  -28.7 -1655.7


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%.

Wipneus

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Re: 2017 sea ice area and extent data
« Reply #411 on: August 21, 2017, 06:40:20 PM »
Extent resumes declining, about all by the CAB facing the Beaufort.


Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-20 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3978.0  -40.4  -360.4    182.7   -6.4  -347.7    181.8  -11.7  -141.7
               Kara Sea             Barents Sea           Greenland Sea
    83.9   +5.8  -210.0     13.0   -2.7   -45.1    104.7   +4.0  -155.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    63.5   +3.9   -28.6      0.0   +0.0    +0.0     42.8   +8.6   -54.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   443.5   -5.1   -26.0    105.5   -0.0  -198.8      0.6   -0.6  -176.1
             Bering Sea          Sea of Okhotsk                   Lakes
     2.9   -1.8    +2.9     26.7   +8.0   +26.7    132.7  -11.4    -3.3
          Other regions       Total (ex. lakes)
    14.6   -1.6   +14.6   5244.2  -40.0 -1699.2

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2750.6   -6.0  -849.1     82.9   -3.5  -246.3    119.5   -8.7   -77.8
               Kara Sea             Barents Sea           Greenland Sea
    36.7   +0.3  -128.0      4.3   -0.7   -19.4     44.7   +2.7   -74.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    28.0   +1.6   -10.6      0.0   +0.0    +0.0     11.9   +2.7   -20.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   232.9   -6.7   -38.0     41.7   -0.4  -127.1      0.5   -0.1   -89.2
             Bering Sea          Sea of Okhotsk                   Lakes
     0.9   -1.1    +0.9     10.9   +4.9   +10.9     80.9   -6.4   +20.1
          Other regions       Total (ex. lakes)
     8.8   -0.5    +8.8   3374.2  -15.4 -1659.6


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%.

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Re: 2017 sea ice area and extent data
« Reply #412 on: August 22, 2017, 06:14:25 PM »
Small changes, hardly significant.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-21 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3975.4   -2.6  -358.7    179.5   -3.3  -345.0    170.1  -11.7  -147.2
               Kara Sea             Barents Sea           Greenland Sea
    83.8   -0.1  -204.4     19.5   +6.5   -37.6    106.6   +1.8  -152.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    63.6   +0.2   -23.2      0.0   +0.0    +0.0     37.9   -4.9   -55.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   427.0  -16.6   -42.9    113.8   +8.2  -188.6      1.2   +0.6  -172.1
             Bering Sea          Sea of Okhotsk                   Lakes
     2.9   -0.0    +2.9     19.6   -7.1   +19.6    126.4   -7.7    -5.9
          Other regions       Total (ex. lakes)
    18.0   +3.4   +18.0   5218.8  -25.4 -1686.8

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2754.8   +4.2  -847.0     85.4   +2.6  -239.2    107.9  -11.5   -84.1
               Kara Sea             Barents Sea           Greenland Sea
    42.1   +5.4  -118.5      6.8   +2.5   -16.6     43.1   -1.6   -75.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    28.7   +0.7    -8.0      0.0   +0.0    +0.0      9.6   -2.3   -21.0
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   228.3   -4.6   -44.5     46.8   +5.1  -120.2      0.6   +0.1   -86.9
             Bering Sea          Sea of Okhotsk                   Lakes
     1.2   +0.2    +1.2      5.6   -5.2    +5.6     75.8   -4.2   +17.4
          Other regions       Total (ex. lakes)
    11.3   +2.5   +11.3   3372.3   -1.9 -1643.1


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: 2017 sea ice area and extent data
« Reply #413 on: August 23, 2017, 07:27:03 PM »
Small extent loss but very little change in area.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-22 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3957.0  -18.3  -372.1    178.8   -0.7  -343.4    160.3   -9.8  -152.8
               Kara Sea             Barents Sea           Greenland Sea
    81.9   -1.9  -201.5     19.5   +0.0   -37.4     97.3   -9.3  -156.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    72.2   +8.5   -14.2      0.0   +0.0    +0.0     40.9   +2.9   -45.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   424.8   -2.2   -39.8    112.5   -1.3  -185.7      1.8   +0.6  -169.7
             Bering Sea          Sea of Okhotsk                   Lakes
     2.3   -0.6    +2.3     18.4   -1.2   +18.4    163.7  +36.7   +30.5
          Other regions       Total (ex. lakes)
    14.6   -3.3   +14.6   5182.4  -36.4 -1683.2

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2768.6  +13.8  -830.9     87.3   +1.9  -235.3     99.6   -8.3   -86.9
               Kara Sea             Barents Sea           Greenland Sea
    36.7   -5.4  -120.5      5.5   -1.3   -17.7     39.7   -3.4   -76.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    31.9   +3.2    -4.6      0.0   +0.0    +0.0     13.0   +3.4   -14.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   231.3   +3.0   -40.2     45.1   -1.7  -119.3      1.0   +0.4   -86.1
             Bering Sea          Sea of Okhotsk                   Lakes
     0.8   -0.4    +0.8      5.7   +0.1    +5.7     99.7  +23.9   +41.3
          Other regions       Total (ex. lakes)
     9.0   -2.3    +9.0   3375.3   +2.9 -1616.8


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: 2017 sea ice area and extent data
« Reply #414 on: August 23, 2017, 07:29:34 PM »
The stall is showing in the basin-only graphs as well, especially area.

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Re: 2017 sea ice area and extent data
« Reply #415 on: August 24, 2017, 04:20:58 PM »
I got this news in my mail box (just showing the main points):

Quote
Sea Ice Concentration CDR Updated to Version 3 and a Near-Real-Time Version Released
August 23, 2017   

NOAA@NSIDC is pleased to announce the release of Version 3 of the NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration (final CDR). The reason for the version change is to update the masks used to remove spurious ice in the North
[...]
Quote
In addition, a Near-Real-Time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration (NRT CDR) has been released. The NRT CDR fills the temporal gap between updates of the final CDR, occurring annually, and provides the most recent available data.
[...]
Quote
The NOAA/NSIDC Sea Ice Concentration CDR uses both the NASA Team and the NASA Bootstrap passive microwave algorithms and combines them in a way that capitalizes on their strengths.

Read the full message here

"NOAA/NSIDC Sea Ice Concentration CDR" is supposed to be a much improved product over NSIDC's standard sea ice concentration that is used to calculate NSIDC sea ice extent. Unfortunately it was never available near real time, which takes away much of the fun of following the day-to-day fate of the sea ice.


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Re: 2017 sea ice area and extent data
« Reply #416 on: August 24, 2017, 06:27:46 PM »
The CAA takes care of a bigger extent drop.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-23 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3942.7  -14.3  -383.8    173.6   -5.1  -340.7    157.1   -3.2  -151.4
               Kara Sea             Barents Sea           Greenland Sea
    80.9   -1.0  -197.2     15.7   -3.8   -39.8    100.8   +3.5  -148.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    68.9   -3.3   -17.1      0.0   +0.0    +0.0     36.6   -4.3   -43.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   376.1  -48.7   -81.2    109.3   -3.2  -188.3      1.8   +0.0  -166.1
             Bering Sea          Sea of Okhotsk                   Lakes
     0.6   -1.7    +0.6     25.6   +7.2   +25.6    208.7  +43.1   +80.0
          Other regions       Total (ex. lakes)
    16.3   +1.7   +16.3   5106.1  -76.3 -1715.3

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2775.3   +6.7  -807.7     80.8   -6.5  -240.2     85.7  -13.9   -98.8
               Kara Sea             Barents Sea           Greenland Sea
    36.3   -0.4  -117.9      5.6   +0.1   -17.3     37.7   -2.0   -76.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    29.7   -2.3    -6.6      0.0   +0.0    +0.0     11.3   -1.7   -14.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   220.0  -11.3   -48.0     40.5   -4.5  -125.4      0.6   -0.3   -84.9
             Bering Sea          Sea of Okhotsk                   Lakes
     0.2   -0.6    +0.2      8.3   +2.7    +8.3    106.6   +6.4   +50.5
          Other regions       Total (ex. lakes)
     9.4   +0.3    +9.4   3341.3  -34.0 -1620.6


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%.

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Re: 2017 sea ice area and extent data
« Reply #417 on: August 24, 2017, 08:25:34 PM »
In addition, a Near-Real-Time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration (NRT CDR) has been released. The NRT CDR fills the temporal gap between updates of the final CDR, occurring annually, and provides the most recent available data.

"NOAA/NSIDC Sea Ice Concentration CDR" is supposed to be a much improved product over NSIDC's standard sea ice concentration that is used to calculate NSIDC sea ice extent. Unfortunately it was never available near real time, which takes away much of the fun of following the day-to-day fate of the sea ice.

Great! It will be nice to have another (hopefully) stable day-to-day data source next melt season. :)
« Last Edit: August 25, 2017, 01:44:16 AM by greatdying2 »
The Permian–Triassic extinction event, a.k.a. the Great Dying, occurred about 250 million years ago and is the most severe known extinction event. Up to 96% of all marine species and 70% of terrestrial vertebrate species became extinct; it is also the only known mass extinction of insects.

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Re: 2017 sea ice area and extent data
« Reply #418 on: August 24, 2017, 11:28:35 PM »
Quote
be nice to have another (hopefully) stable day-to-day data source
I won't be using it myself -- the resolution doesn't seem competitive with other products.

Whoa ... Pandora 4.8.2 all-platform freeware has gotten a whole lot better at making maps from these netCDF (.nc) files.

https://www.giss.nasa.gov/tools/panoply/download/

https://www.esrl.noaa.gov/psd/forecasts/seaice/

ftp://ftp1.esrl.noaa.gov/RASM-ESRL/ModelOutput/RASM-ESRL_4NIC_2017-08-23.tar.gz

ftp://ftp-projects.cen.uni-hamburg.de/seaice/AMSR2/3.125km/Arc_20170823_res3.125_pyres.nc.gz

ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G10016/north/daily/2017/seaice_conc_daily_icdr_nh_f18_20170823_v01r00.nc

Wipneus

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Re: 2017 sea ice area and extent data
« Reply #419 on: August 25, 2017, 09:47:20 AM »
The first thing I noticed is the size of the pole hole, see A-team's image. It is much bigger than the normal NSIDC SIC product, while using the same sensor (f18 SSMIS)
I have noticed NSIDC.

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Re: 2017 sea ice area and extent data
« Reply #420 on: August 25, 2017, 11:14:58 AM »
Pandora 4.8.2 all-platform freeware has gotten a whole lot better at making maps from these netCDF (.nc) files.

I assume you mean Panoply? It still gets the arrows indicating the direction of a swell back to front!
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Re: 2017 sea ice area and extent data
« Reply #421 on: August 25, 2017, 07:04:16 PM »
Century extent drop, most of it outside the Basin: CAA, Baffin, Hudson, Greenland Sea.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-24 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3949.8   +7.2  -370.7    171.1   -2.5  -336.5    144.7  -12.4  -157.0
               Kara Sea             Barents Sea           Greenland Sea
    80.3   -0.6  -195.2     18.7   +3.0   -36.5     84.5  -16.3  -163.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    53.5  -15.4   -29.9      0.0   +0.0    +0.0     21.0  -15.6   -59.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   334.5  -41.6  -113.1     91.5  -17.8  -202.1      0.6   -1.2  -164.1
             Bering Sea          Sea of Okhotsk                   Lakes
     4.1   +3.5    +4.1     21.3   -4.3   +21.3    229.7  +20.5   +97.8
          Other regions       Total (ex. lakes)
    16.4   +0.1   +16.4   4992.2 -113.9 -1785.8

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2762.4  -12.9  -804.6     81.2   +0.4  -234.4     86.5   +0.8   -94.5
               Kara Sea             Barents Sea           Greenland Sea
    35.0   -1.3  -117.0      5.7   +0.1   -16.6     33.8   -3.9   -80.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    24.8   -4.8   -11.0      0.0   +0.0    +0.0      7.5   -3.8   -18.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   197.1  -22.9   -67.0     31.5   -9.1  -134.6      0.4   -0.2   -84.0
             Bering Sea          Sea of Okhotsk                   Lakes
     1.7   +1.6    +1.7      6.3   -2.1    +6.3    104.9   -1.4   +47.2
          Other regions       Total (ex. lakes)
     9.7   +0.4    +9.7   3283.5  -57.8 -1645.4


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: 2017 sea ice area and extent data
« Reply #422 on: August 26, 2017, 07:06:02 PM »
According to NSIDC NT sea ice concentration there was another more than average drop of extent, most in the CAA.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-25 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3934.2  -15.7  -381.6    154.5  -16.6  -344.3    143.4   -1.3  -150.6
               Kara Sea             Barents Sea           Greenland Sea
    78.3   -2.0  -191.8     16.1   -2.6   -38.3     70.1  -14.4  -174.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    52.6   -0.9   -29.6      0.0   +0.0    +0.0     22.9   +1.9   -57.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   287.0  -47.5  -158.2    104.9  +13.4  -185.7      0.6   +0.0  -162.5
             Bering Sea          Sea of Okhotsk                   Lakes
     1.1   -2.9    +1.1     24.0   +2.8   +24.0    227.8   -1.9   +94.5
          Other regions       Total (ex. lakes)
    17.6   +1.2   +17.6   4907.5  -84.7 -1832.6

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2728.9  -33.5  -819.2     65.4  -15.8  -243.6     91.2   +4.7   -84.9
               Kara Sea             Barents Sea           Greenland Sea
    34.1   -0.9  -114.5      4.4   -1.3   -17.6     29.3   -4.4   -84.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    23.3   -1.5   -12.4      0.0   +0.0    +0.0      8.0   +0.5   -17.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   167.8  -29.3   -94.0     34.5   +3.1  -129.8      0.4   +0.0   -83.7
             Bering Sea          Sea of Okhotsk                   Lakes
     0.2   -1.5    +0.2      6.8   +0.5    +6.8    102.3   -2.6   +43.3
          Other regions       Total (ex. lakes)
     9.8   +0.1    +9.8   3204.3  -79.2 -1685.6


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: 2017 sea ice area and extent data
« Reply #423 on: August 27, 2017, 08:04:38 PM »
Small drops on the Pacific front.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-26 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3919.3  -14.8  -390.7    155.8   +1.3  -336.0    141.5   -1.9  -145.6
               Kara Sea             Barents Sea           Greenland Sea
    67.8  -10.5  -195.5     18.6   +2.5   -33.0     69.7   -0.4  -172.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    53.9   +1.3   -28.5      0.0   +0.0    +0.0     15.6   -7.3   -58.8
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   327.1  +40.1  -118.7    103.0   -1.9  -186.8      0.6   +0.0  -161.1
             Bering Sea          Sea of Okhotsk                   Lakes
     2.3   +1.2    +2.3     23.0   -1.0   +23.0    226.6   -1.2   +91.8
          Other regions       Total (ex. lakes)
    14.4   -3.2   +14.4   4912.7   +5.2 -1787.2

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2718.2  -10.7  -803.3     67.8   +2.4  -237.0     89.7   -1.5   -83.7
               Kara Sea             Barents Sea           Greenland Sea
    29.5   -4.6  -116.4      5.1   +0.7   -16.1     29.1   -0.2   -83.6
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    24.1   +0.8   -11.7      0.0   +0.0    +0.0      4.7   -3.3   -19.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   168.0   +0.1   -93.1     34.7   +0.1  -130.0      0.4   +0.0   -84.3
             Bering Sea          Sea of Okhotsk                   Lakes
     0.8   +0.6    +0.8      7.1   +0.3    +7.1    102.7   +0.5   +44.7
          Other regions       Total (ex. lakes)
     9.5   -0.3    +9.5   3188.7  -15.6 -1660.9


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%.

Dave C

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Re: 2017 sea ice area and extent data
« Reply #424 on: August 27, 2017, 09:33:36 PM »
I think this question has been asked before, but I can't remember the answer-

Obviously there is no ice being gained or lost in the great lakes. So how do they know that the ice is really being gained/lost in more uncertain areas and not just a product of a flawed model?

greatdying2

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Re: 2017 sea ice area and extent data
« Reply #425 on: August 27, 2017, 10:04:45 PM »
I think this question has been asked before, but I can't remember the answer-

Obviously there is no ice being gained or lost in the great lakes. So how do they know that the ice is really being gained/lost in more uncertain areas and not just a product of a flawed model?

You don't. However, such noise does not persist, which is why it's best to not look at day-to-day values for this product, but several-day averages (where such noise cancels itself out).
The Permian–Triassic extinction event, a.k.a. the Great Dying, occurred about 250 million years ago and is the most severe known extinction event. Up to 96% of all marine species and 70% of terrestrial vertebrate species became extinct; it is also the only known mass extinction of insects.

Jim Pettit

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Re: 2017 sea ice area and extent data
« Reply #426 on: August 28, 2017, 02:51:16 PM »
NSIDC extent went up again, this time by 86k. Those are the first back-to-back one-day increases in August since 2007. 2017 is now 1.21M higher than 2012 on this date, and nearly half a million higher than 2016. In the past three days, SIE has risen by 7k.

My projections show an extent minimum on September 12 of around 4.58M, with a September average of 4.72M.
« Last Edit: August 28, 2017, 04:45:33 PM by Jim Pettit »

Wipneus

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Re: 2017 sea ice area and extent data
« Reply #427 on: August 28, 2017, 07:45:46 PM »
Yes, and the regional breakdown shows the increase is all in the CAA. Without the CAA the Arctic would have been a quieter place with little changes.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-27 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3916.1   -3.3  -387.9    155.8   +0.0  -328.2    139.5   -1.9  -143.4
               Kara Sea             Barents Sea           Greenland Sea
    79.3  +11.6  -178.8      8.4  -10.2   -41.3     66.6   -3.1  -174.4
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    50.2   -3.7   -31.0      0.0   +0.0    +0.0     33.5  +17.9   -38.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   414.2  +87.1   -28.6     97.8   -5.1  -189.6      0.6   +0.0  -157.2
             Bering Sea          Sea of Okhotsk                   Lakes
     1.1   -1.2    +1.1     22.4   -0.6   +22.4    188.9  -35.7   +57.0
          Other regions       Total (ex. lakes)
    13.5   -1.0   +13.5   4999.1  +86.5 -1661.4

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2692.6  -25.6  -815.5     67.9   +0.1  -233.9     87.7   -2.0   -83.6
               Kara Sea             Barents Sea           Greenland Sea
    35.5   +6.0  -109.8      2.3   -2.8   -18.4     30.0   +0.9   -82.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    22.2   -1.9   -12.9      0.0   +0.0    +0.0      9.0   +4.3   -13.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   215.1  +47.1   -47.0     32.5   -2.1  -132.6      0.4   -0.0   -81.9
             Bering Sea          Sea of Okhotsk                   Lakes
     0.5   -0.3    +0.5      7.2   +0.1    +7.2     96.4   -6.0   +38.4
          Other regions       Total (ex. lakes)
     9.0   -0.5    +9.0   3212.0  +23.3 -1614.8


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%.

Jim Pettit

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Re: 2017 sea ice area and extent data
« Reply #428 on: August 29, 2017, 02:55:25 PM »
And...NSIDC extent went up yet again, for a rare (if not unprecedented) third consecutive day. It's now in 6th place, and flirting with falling into seventh (behind 2008):



While it's highly unlikely we've already reached the minimum, at this point a sub 4.5k minimum is nowhere near guaranteed. My projections now indicate a September 12 minimum of 4.6M, and a September average of 4.76M.

Sterks

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Re: 2017 sea ice area and extent data
« Reply #429 on: August 29, 2017, 07:33:12 PM »
Actually the inverted dipole is getting in a location to spread the pack even more (the low is creeping into the Central Arctic) with colder, much colder temperatures over Beaufort Chukchi and the adjacent portion of the CAB. However, strong warmer winds over Laptev and ESS are keeping melt up in these areas, as Wipneus map over AMSR2 thread shows.
What may be happening is that NSIDC lower resolution picks the first effect but not the second for extent. UH extent has kept falling steadily, the pack is very broken.
Relative equilibrium situation in regards to extent, but since UH area keeps falling, extent is candidate to further loses later (I guess, weather dependent).

Quantum

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Re: 2017 sea ice area and extent data
« Reply #430 on: August 29, 2017, 07:54:26 PM »
And...NSIDC extent went up yet again, for a rare (if not unprecedented) third consecutive day. It's now in 6th place, and flirting with falling into seventh (behind 2008):



While it's highly unlikely we've already reached the minimum, at this point a sub 4.5k minimum is nowhere near guaranteed. My projections now indicate a September 12 minimum of 4.6M, and a September average of 4.76M.

I'd be interested for some statistics about melt season ends. Which day would the minimum have to be achieved on to break some record?

Wipneus

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Re: 2017 sea ice area and extent data
« Reply #431 on: August 29, 2017, 08:00:50 PM »
As Jim noticed an uptick in extent, but outside the Basin: Hudson, Baffin and CAA took care of most of the extent increase. Area is still dropping, it is fifth lowest at the moment but a 3rd place for the annual minimum is entirely possible.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-28 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3900.3  -15.8  -398.0    154.5   -1.4  -323.8    131.7   -7.8  -146.2
               Kara Sea             Barents Sea           Greenland Sea
    60.7  -18.6  -195.3     13.1   +4.6   -35.8     72.7   +6.1  -161.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    62.7  +12.5   -15.6      0.0   +0.0    +0.0     50.4  +16.9   -17.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   430.3  +16.1   -15.7     93.4   -4.4  -192.4      0.6   +0.0  -153.2
             Bering Sea          Sea of Okhotsk                   Lakes
     3.5   +2.4    +3.5     20.6   -1.8   +20.6    159.0  -29.5   +22.3
          Other regions       Total (ex. lakes)
    15.0   +1.5   +15.0   5009.4  +10.3 -1615.5

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2645.1  -47.5  -856.7     67.1   -0.8  -230.7     84.2   -3.5   -83.3
               Kara Sea             Barents Sea           Greenland Sea
    30.2   -5.4  -114.0      3.7   +1.4   -16.8     32.3   +2.3   -76.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    25.3   +3.1    -8.9      0.0   +0.0    +0.0     12.7   +3.7    -9.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   223.7   +8.6   -38.7     33.9   +1.4  -131.0      0.4   +0.0   -79.5
             Bering Sea          Sea of Okhotsk                   Lakes
     1.4   +0.9    +1.4      7.2   +0.0    +7.2     86.1  -10.2   +26.7
          Other regions       Total (ex. lakes)
     8.8   -0.3    +8.8   3176.0  -36.0 -1627.2


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: 2017 sea ice area and extent data
« Reply #432 on: August 29, 2017, 08:10:37 PM »
To illustrate why third place for area is possible (but 1st or 2nd out of reach) here are the area graphs, Basin only and the full NH.

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Re: 2017 sea ice area and extent data
« Reply #433 on: August 29, 2017, 08:27:03 PM »
And...NSIDC extent went up yet again, for a rare (if not unprecedented) third consecutive day. It's now in 6th place, and flirting with falling into seventh (behind 2008):



While it's highly unlikely we've already reached the minimum, at this point a sub 4.5k minimum is nowhere near guaranteed. My projections now indicate a September 12 minimum of 4.6M, and a September average of 4.76M.

I'd be interested for some statistics about melt season ends. Which day would the minimum have to be achieved on to break some record?

The minimum has never occurred in August.  The earliest daily minimum occurred in 1987 on Sept. 2.  However NSIDC reports the minimum of their 5-day extent as their official bottom, which occurred on Sept 5, 1987.  Unless melt picks up soon, the minimum is likely to fall between 6th and 8th lowest.

Wipneus

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Re: 2017 sea ice area and extent data
« Reply #434 on: August 30, 2017, 07:35:50 PM »
Small area drop and nearly no change in extent.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-29 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3908.6   +8.3  -385.9    153.2   -1.3  -320.5    125.2   -6.6  -146.0
               Kara Sea             Barents Sea           Greenland Sea
    67.4   +6.7  -181.0     11.0   -2.0   -39.2     69.6   -3.1  -159.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    65.3   +2.6   -11.2      0.0   +0.0    +0.0     46.7   -3.7   -19.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   412.4  -17.9   -20.5     94.7   +1.3  -185.7      0.6   +0.0  -152.3
             Bering Sea          Sea of Okhotsk                   Lakes
     2.3   -1.2    +2.3     31.6  +10.9   +31.6    158.7   +1.1   +18.5
          Other regions       Total (ex. lakes)
    14.4   -0.6   +14.4   5002.9   -6.5 -1572.5

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2620.6  -24.5  -871.6     67.3   +0.2  -227.9     80.1   -4.0   -83.4
               Kara Sea             Barents Sea           Greenland Sea
    32.3   +2.2  -106.8      3.5   -0.2   -17.3     32.3   +0.0   -73.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    25.7   +0.5    -7.6      0.0   +0.0    +0.0     13.5   +0.9    -7.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   216.0   -7.7   -39.9     35.4   +1.5  -129.8      0.5   +0.0   -78.3
             Bering Sea          Sea of Okhotsk                   Lakes
     0.4   -1.0    +0.4     12.2   +5.0   +12.2     84.5   -1.3   +23.4
          Other regions       Total (ex. lakes)
     8.1   -0.7    +8.1   3148.1  -27.9 -1622.9


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: 2017 sea ice area and extent data
« Reply #435 on: August 30, 2017, 07:51:47 PM »

The minimum has never occurred in August.  The earliest daily minimum occurred in 1987 on Sept. 2.

Minimum area in 1992 was on 31st August.

Here are the ten earliest minimums (first column is the year's ranking of lowest minimums)

NH Area

31 1992-08-31 5.084517
35 1987-09-02 5.339545
36 1983-09-02 5.357635
14 2005-09-03 4.134433
16 2000-09-03 4.235279
33 1988-09-03 5.209891
 3 2011-09-05 2.916451
13 2002-09-05 4.098445
15 2003-09-05 4.155104
26 1994-09-05 4.854227

Daniel B.

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Re: 2017 sea ice area and extent data
« Reply #436 on: August 30, 2017, 08:16:59 PM »

The minimum has never occurred in August.  The earliest daily minimum occurred in 1987 on Sept. 2.

Minimum area in 1992 was on 31st August.

Here are the ten earliest minimums (first column is the year's ranking of lowest minimums)

NH Area

31 1992-08-31 5.084517
35 1987-09-02 5.339545
36 1983-09-02 5.357635
14 2005-09-03 4.134433
16 2000-09-03 4.235279
33 1988-09-03 5.209891
 3 2011-09-05 2.916451
13 2002-09-05 4.098445
15 2003-09-05 4.155104
26 1994-09-05 4.854227


OK, so the earliest area minimum did occur once in August.  We were looking at the extent data.

Jim Pettit

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Re: 2017 sea ice area and extent data
« Reply #437 on: August 30, 2017, 09:18:24 PM »
Here's a normal distribution chart for the day of the year on which the NSIDC SIE minimum has occurred over since satellite records were kept. The earliest and latest minimums (1987 and 1989, respectively) are shown in orange, while this year's to-date minimum is in red. Reaching minimum last week would obviously be possible, but very anomalous, being more than three standard deviations from the mean.


Wipneus

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Re: 2017 sea ice area and extent data
« Reply #438 on: August 31, 2017, 06:25:48 PM »
The loss of a quarter  of the remaining ice extent (area even more by percentage) in the Beaufort seems to be the most prominent event today.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-30 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3887.0  -21.6  -403.1    157.7   +4.5  -311.2    118.0   -7.2  -150.6
               Kara Sea             Barents Sea           Greenland Sea
    73.5   +6.1  -169.6      5.8   -5.2   -45.2     71.5   +2.0  -159.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    86.1  +20.8   +10.5      0.0   +0.0    +0.0     30.3  -16.4   -34.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   389.9  -22.5   -32.7     69.3  -25.4  -211.1      0.6   +0.0  -148.7
             Bering Sea          Sea of Okhotsk                   Lakes
     2.3   +0.0    +2.3     29.0   -2.6   +29.0    159.0   -0.2   +16.9
          Other regions       Total (ex. lakes)
    17.5   +3.1   +17.5   4938.5  -64.5 -1606.2

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2605.4  -15.2  -875.1     71.2   +3.9  -223.4     66.1  -14.1   -94.1
               Kara Sea             Barents Sea           Greenland Sea
    34.6   +2.3  -100.5      2.6   -0.9   -18.3     34.6   +2.4   -73.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    32.9   +7.2    -0.2      0.0   +0.0    +0.0      9.6   -3.9   -11.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   210.7   -5.3   -38.3     22.7  -12.7  -141.3      0.4   -0.0   -76.3
             Bering Sea          Sea of Okhotsk                   Lakes
     0.8   +0.3    +0.8     10.9   -1.3   +10.9     91.2   +6.5   +29.6
          Other regions       Total (ex. lakes)
     9.0   +0.9    +9.0   3111.5  -36.6 -1631.3


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: 2017 sea ice area and extent data
« Reply #439 on: August 31, 2017, 06:31:59 PM »
According to NSIDC NT sea ice concentration, extent in 2017 is currently the 8th lowest, area is 7th. It would need more than 300k extent drop for extent to go below #7 (2010). That would be more than enough for area to go to 3th lowest place.

NH Extent
1 2012-09-16 3.339905
2 2016-09-07 4.144993
3 2007-09-14 4.146931
4 2011-09-08 4.332572
5 2015-09-08 4.387092
6 2008-09-18 4.548265
7 2010-09-19 4.589683
8 2017-08-25 4.907457

NH Area
1 2012-09-12 2.228429
2 2016-09-06 2.463209
3 2011-09-05 2.916451
4 2007-09-07 2.954993
5 2010-09-07 3.071674
6 2008-09-08 3.079552
7 2017-08-30 3.111477

Wipneus

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Re: 2017 sea ice area and extent data
« Reply #440 on: August 31, 2017, 06:45:01 PM »
Area in the last couple of days has been dropping relatively faster than extent. At least for the UH AMSR2 and NSIDC sea ice concentration products. This translates to a lower "compactness" (area by extent ratio) as can be seen in the attached graph. Currently 2017 compactness is lowest for the day except 2016 for NSIDC.
Note that Jaxa AMSR2 does not show anything remarkable (yet).

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Wipneus

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Re: 2017 sea ice area and extent data
« Reply #441 on: August 31, 2017, 06:52:28 PM »
Oh, one last graph that can be watched in the coming time is the Global Area calculated from NSIDC sea ice concentration. Last year the 2016 line separated from the bunch around this day. What will 2017 do, like 2016 or return to the normal?

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Re: 2017 sea ice area and extent data
« Reply #442 on: August 31, 2017, 09:09:16 PM »
What will 2017 do? Indeed. One more cyclone or storm bringing southerlies into, say, the Atlantic side of the Arctic, between Svalbard and FJL before it gets too cold, might push 2017 extent ⬇️ by a hefty amount of, say, 500kKm2. How about a week from now?


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Re: 2017 sea ice area and extent data
« Reply #443 on: September 01, 2017, 08:06:26 PM »
Area drop, mostly in the CAB, takes 2017 to the 5th lowest annual value (from #7). Needs 127k for third lowest place.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-08-31 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3880.5   -6.5  -405.5    153.8   -3.9  -309.8    110.8   -7.2  -152.8
               Kara Sea             Barents Sea           Greenland Sea
    75.9   +2.5  -166.5      7.7   +1.9   -41.3     76.7   +5.2  -154.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    66.7  -19.4    +4.7      0.0   +0.0    +0.0     23.4   -6.9   -17.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   363.5  -26.4   -60.9     69.3   -0.1  -206.1      1.2   +0.6  -147.8
             Bering Sea          Sea of Okhotsk                   Lakes
     1.7   -0.6    +0.6     24.0   -5.0   +24.0    218.8  +56.9   +79.2
          Other regions       Total (ex. lakes)
    18.3   +0.8   +18.3   4873.5  -65.0 -1615.1

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2561.6  -43.8  -913.6     70.9   -0.2  -223.4     56.9   -9.1  -100.5
               Kara Sea             Barents Sea           Greenland Sea
    35.8   +1.2   -97.3      1.7   -0.9   -18.3     34.8   +0.1   -74.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    30.9   -2.0    +2.7      0.0   +0.0    +0.0      8.4   -1.2    -5.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   200.3  -10.4   -45.5     22.6   -0.0  -135.1      0.5   +0.1   -75.0
             Bering Sea          Sea of Okhotsk                   Lakes
     0.7   -0.0    +0.2      7.5   -3.4    +7.5    102.9  +11.0   +44.3
          Other regions       Total (ex. lakes)
    10.3   +1.3   +10.3   3043.0  -68.5 -1668.0


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: 2017 sea ice area and extent data
« Reply #444 on: September 02, 2017, 07:32:29 PM »
Century extent drop, with the help of the September Ocean masks. Aka the first of the month effect, which accounts for perhaps 45k drop in extent and about half of that in area.


Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-09-01 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3875.2   -5.3  -409.1    142.9  -10.9  -317.2    105.6   -5.2  -155.4
               Kara Sea             Barents Sea           Greenland Sea
    73.3   -2.7  -162.3      7.0   -0.7   -40.5     67.7   -9.0  -160.3
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    40.7  -26.1   -19.0      0.0   +0.0    +0.0     21.9   -1.5   -17.6
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   354.7   -8.8   -61.5     66.2   -3.1  -207.1      0.6   -0.6  -147.0
             Bering Sea          Sea of Okhotsk                   Lakes
     0.0   -1.7    -2.7      0.0  -24.0    +0.0    223.8   +4.5   +85.0
          Other regions       Total (ex. lakes)
     2.0  -16.3    +2.0   4757.7 -115.8 -1697.8

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2551.4  -10.1  -908.0     61.6   -9.4  -230.5     62.5   +5.6   -93.2
               Kara Sea             Barents Sea           Greenland Sea
    34.6   -1.1   -97.0      1.9   +0.1   -17.8     32.9   -1.9   -74.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    19.4  -11.5    -8.3      0.0   +0.0    +0.0      7.1   -1.2    -6.7
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   195.3   -5.0   -48.6     23.5   +0.8  -135.7      0.4   -0.1   -75.7
             Bering Sea          Sea of Okhotsk                   Lakes
     0.0   -0.7    -0.6      0.0   -7.5    +0.0    100.9   -2.0   +40.3
          Other regions       Total (ex. lakes)
     0.5   -9.7    +0.5   2991.1  -51.8 -1696.1


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: 2017 sea ice area and extent data
« Reply #445 on: September 03, 2017, 07:44:08 PM »
Also NSIDC sea ice concentration shows increases of extent and area, the latter nearly a century.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-09-02 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3913.6  +38.4  -367.8    133.2   -9.7  -322.6    105.0   -0.6  -153.1
               Kara Sea             Barents Sea           Greenland Sea
    68.3   -5.0  -164.1      2.6   -4.4   -44.9     78.1  +10.4  -147.5
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    43.0   +2.4   -14.7      0.0   +0.0    +0.0     36.8  +14.9    -2.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   344.7  -10.0   -64.0     61.7   -4.5  -210.6      0.6   +0.0  -145.0
             Bering Sea          Sea of Okhotsk                   Lakes
     0.0   +0.0    -2.9      0.0   +0.0    +0.0    219.2   -4.6   +79.3
          Other regions       Total (ex. lakes)
     3.5   +1.5    +3.5   4791.1  +33.4 -1635.7

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2649.8  +98.4  -803.6     56.2   -5.4  -232.7     66.2   +3.7   -88.9
               Kara Sea             Barents Sea           Greenland Sea
    32.1   -2.5   -98.5      0.8   -1.0   -18.8     36.6   +3.7   -69.7
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    20.0   +0.7    -6.8      0.0   +0.0    +0.0     12.6   +5.5    -1.1
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   194.3   -1.0   -48.2     17.7   -5.8  -141.8      0.4   -0.0   -75.7
             Bering Sea          Sea of Okhotsk                   Lakes
     0.0   +0.0    -0.8      0.0   +0.0    +0.0    109.3   +8.4   +47.9
          Other regions       Total (ex. lakes)
     0.7   +0.2    +0.7   3087.6  +96.5 -1585.9


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: 2017 sea ice area and extent data
« Reply #446 on: September 04, 2017, 05:48:12 PM »
Area has big increase for the second day. Extent did not change much.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-09-03 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3925.2  +11.6  -350.5    130.7   -2.5  -317.6    103.7   -1.3  -151.5
               Kara Sea             Barents Sea           Greenland Sea
    68.9   +0.6  -160.4      2.6   -0.0   -42.8     70.9   -7.2  -154.8
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    47.4   +4.3   -10.1      0.0   +0.0    +0.0     20.0  -16.8   -18.9
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   362.3  +17.7   -48.7     64.2   +2.5  -209.4      0.6   +0.0  -142.3
             Bering Sea          Sea of Okhotsk                   Lakes
     1.2   +1.2    -1.3      0.0   +0.0    +0.0    177.3  -41.9   +37.1
          Other regions       Total (ex. lakes)
     3.0   -0.5    +3.0   4800.8   +9.7 -1605.2

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2722.5  +72.6  -725.3     53.0   -3.2  -232.8     67.3   +1.1   -86.4
               Kara Sea             Barents Sea           Greenland Sea
    33.3   +1.2   -95.5      1.0   +0.2   -18.0     33.1   -3.6   -73.9
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    22.0   +2.0    -4.5      0.0   +0.0    +0.0      6.3   -6.3    -7.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   201.7   +7.4   -41.0     19.2   +1.5  -140.6      0.4   +0.0   -75.5
             Bering Sea          Sea of Okhotsk                   Lakes
     0.7   +0.7    +0.1      0.0   +0.0    +0.0     97.4  -11.9   +36.2
          Other regions       Total (ex. lakes)
     0.6   -0.1    +0.6   3161.2  +73.6 -1500.4


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%.

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Re: 2017 sea ice area and extent data
« Reply #447 on: September 04, 2017, 05:53:03 PM »
Time for an update of the NSIDC Basin-only graphs. Did I mention the the uptick in area was remarkable?

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Re: 2017 sea ice area and extent data
« Reply #448 on: September 05, 2017, 07:34:09 PM »
Extent back with a small drop, area adds to the remarkable (for the first week in September) uptick.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-09-04 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3911.0  -14.3  -357.6    117.2  -13.4  -326.5    106.9   +3.2  -148.6
               Kara Sea             Barents Sea           Greenland Sea
    66.4   -2.6  -155.8      1.9   -0.6   -41.1     74.3   +3.3  -154.1
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    47.4   +0.0   -10.2      0.0   +0.0    +0.0     14.8   -5.2   -22.4
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   372.7  +10.4   -33.5     64.2   -0.0  -206.2      0.6   +0.0  -140.2
             Bering Sea          Sea of Okhotsk                   Lakes
     2.4   +1.2    +0.1      0.0   +0.0    +0.0    189.2  +11.9   +47.9
          Other regions       Total (ex. lakes)
     2.5   -0.5    +2.5   4782.4  -18.4 -1593.7

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2765.6  +43.2  -679.9     43.7   -9.3  -239.5     67.1   -0.3   -87.0
               Kara Sea             Barents Sea           Greenland Sea
    31.5   -1.8   -95.4      0.5   -0.6   -17.6     34.8   +1.8   -73.0
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    22.6   +0.6    -4.4      0.0   +0.0    +0.0      5.6   -0.8    -7.5
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   209.4   +7.7   -31.1     18.9   -0.3  -139.2      0.5   +0.0   -74.9
             Bering Sea          Sea of Okhotsk                   Lakes
     0.4   -0.3    -0.2      0.0   +0.0    +0.0    100.8   +3.5   +38.7
          Other regions       Total (ex. lakes)
     0.5   -0.1    +0.5   3201.0  +39.8 -1449.1


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%.

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Re: 2017 sea ice area and extent data
« Reply #449 on: September 06, 2017, 07:29:02 PM »
Also NSIDC sees both extent and area declining again. Extent is back to the lowest annual value, no record early minimum this year.

Regional Arctic Sea Ice Extent and Area calculated from NSIDC NASA Team concentration data
Date: 2017-09-05 12:00  Values in 1000 km^2

Extent (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  3858.2  -52.8  -407.4    113.4   -3.9  -328.4    102.4   -4.6  -153.6
               Kara Sea             Barents Sea           Greenland Sea
    68.8   +2.4  -151.6      5.8   +3.9   -36.9     79.5   +5.2  -150.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    42.5   -4.9   -14.1      0.0   +0.0    +0.0     18.1   +3.3   -17.2
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   365.9   -6.8   -34.7     64.8   +0.6  -200.9      1.2   +0.6  -137.8
             Bering Sea          Sea of Okhotsk                   Lakes
     0.6   -1.8    -1.8      0.0   +0.0    +0.0    219.1  +30.0   +82.7
          Other regions       Total (ex. lakes)
     1.5   -1.0    +1.5   4722.6  -59.8 -1632.9

Area (value, one day change, anomaly):
   Central Arctic Basin       East Siberian Sea              Laptev Sea
  2735.8  -29.8  -713.3     41.5   -2.2  -238.3     65.1   -2.0   -89.3
               Kara Sea             Barents Sea           Greenland Sea
    33.4   +2.0   -91.8      1.6   +1.1   -16.3     39.9   +5.0   -69.2
Baffin/Newfoundland Bay            St. Lawrence              Hudson Bay
    22.2   -0.4    -4.7      0.0   +0.0    +0.0      5.8   +0.2    -6.3
   Canadian Archipelago            Beaufort Sea             Chukchi Sea
   208.2   -1.2   -29.0     19.2   +0.3  -137.3      0.6   +0.1   -74.2
             Bering Sea          Sea of Okhotsk                   Lakes
     0.1   -0.3    -0.6      0.0   +0.0    +0.0    105.3   +4.6   +45.6
          Other regions       Total (ex. lakes)
     0.4   -0.2    +0.4   3173.7  -27.3 -1469.8


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%.