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gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #50 on: January 14, 2021, 05:51:29 PM »
NSIDC Total AREA as at 13-Jan-2021 (5 day trailing average) 11,355,855 KM2         
         
Total Area         
 11,355,855    km2      
-382,319    km2   <   2010's average.
-502,712    km2   <   2020
 270,153    km2   >   2017
         
Total Change    78    k   gain
Peripheral Seas    59    k   gain
Central Seas___    19    k   gain
         
Peripheral Seas         
Okhotsk______    17    k   gain
Bering _______    15    k   gain
Hudson Bay___    9    k   gain
Baffin  Bay____    12    k   gain
St Lawrence___   -4    k   loss
Greenland____    0    k   gain
Barents ______    11    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______   -5    k   loss
Beaufort_____   -3    k   loss
CAA_________    1    k   gain
East Siberian__   -0    k   loss
Central Arctic_    11    k   gain
Laptev_______    2    k   gain
Kara_________    13    k   gain
         
Sea ice area gain on this day 78 k, 36 k more than the 2010's average gain of 42 k         
         
- Area is at position #2 in the satellite record.         
- Area is 382 k less than the 2010's average         
- Area is 270 k more than 2017         
- Area is 304 k less than 2016         
- Area is 503 k less than 2020          
- Area is 969 k less than 2012         
___________________________________________         
NSIDC Total EXTENT as at 13-Jan-2021 (5 day trailing average) 13,083,029 KM2         
         
NSIDC Sea ice EXTENT gain on this day 61 k, 12 k more than the 2010's average gain of 49k         
         
- EXTENT is at position #4 in the satellite record.         
- EXTENT is 118 k less than the 2010's average         
- EXTENT is 308 k more than 2017         
- EXTENT is 166 k less than 2016         
- EXTENT is 139 k less than 2020          
- EXTENT is 559 k less than 2012         
___________________________________________         
Note: Click an image for full-size         
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Juan C. García

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Re: 2021 Sea ice area and extent data
« Reply #51 on: January 15, 2021, 04:48:55 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

January 14th, 2021:
     12,943,114 km2, an increase of 63,835 km2.
     2021 is now 8th lowest on record.
     In the graph are today's 16 lowest years.
     Highlighted 2010's average, 2021 and the 5 years with daily lowest minimum:
          (2012, 2020, 2019, 2016 & 2007)

Source: https://ads.nipr.ac.jp/vishop/#/extent.
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #52 on: January 15, 2021, 10:16:11 AM »
JAXA ARCTIC SEA ICE EXTENT:  12,943,114 KM2 as at 14-Jan-2021

- Extent gain on this day 64k, 14 k more than the average gain on this day (of the last 10 years) of 50k,
- Extent gain from minimum on this date is 9,388 k, which is 814 k, 10% more than the 10 year average of 8,574 k.

- Extent is at position #8 in the satellite record

- Extent is  24 k MORE than 2020,
- Extent is  465 k MORE than  2018,
- Extent is  555 k MORE than 2017
- Extent is  114 k LESS than 2013
- Extent is  45 k LESS than the 2010's Average
_____________________________________________
On average 86.4% of extent gains  from minimum to maximum done, and 53 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 14.29 million km2, 0.41 million km2 above the March 2017 record low maximum of 13.88 million km2.
_______________________________________________________________
Extent down from 2nd lowest to 8th lowest in just 8 days.
_______________________________________________________________
N.B. Click on image to enlarge
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #53 on: January 15, 2021, 03:14:26 PM »
NSIDC Total AREA as at 14-Jan-2021 (5 day trailing average) 11,439,190 KM2         
         
Total Area         
 11,439,190    km2      
-341,619    km2   <   2010's average.
-458,186    km2   <   2020
 338,542    km2   >   2017
         
Total Change    83    k   gain
Peripheral Seas    61    k   gain
Central Seas___    22    k   gain
         
Peripheral Seas         
Okhotsk______    14    k   gain
Bering _______    16    k   gain
Hudson Bay___    4    k   gain
Baffin  Bay____    15    k   gain
St Lawrence___   -3    k   loss
Greenland____   -3    k   loss
Barents ______    17    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______   -7    k   loss
Beaufort_____   -1    k   loss
CAA_________    1    k   gain
East Siberian__   -3    k   loss
Central Arctic_    18    k   gain
Laptev_______    1    k   gain
Kara_________    13    k   gain
         
Sea ice area gain on this day 83 k, 40 k more than the 2010's average gain of 43 k         
         
- Area is at position #2 in the satellite record.         
- Area is 342 k less than the 2010's average         
- Area is 339 k more than 2017         
- Area is 252 k less than 2016         
- Area is 458 k less than 2020          
- Area is 900 k less than 2012         
___________________________________________         
NSIDC Total EXTENT as at 14-Jan-2021 (5 day trailing average) 13,138,195 KM2         
         
NSIDC Sea ice EXTENT gain on this day 55 k, 14 k more than the 2010's average gain of 41k         
         
- EXTENT is at position #4 in the satellite record.         
- EXTENT is 104 k less than the 2010's average         
- EXTENT is 361 k more than 2017         
- EXTENT is 177 k less than 2016         
- EXTENT is 125 k less than 2020          
- EXTENT is 536 k less than 2012         
___________________________________________         
Note: Click an image for full-size         
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Juan C. García

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Re: 2021 Sea ice area and extent data
« Reply #54 on: January 16, 2021, 04:45:26 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

January 15th, 2021:
     13,003,003 km2, an increase of  59,889 km2.
     2021 is 8th lowest on record.
     In the graph are today's 15 lowest years.
     Highlighted 2010's average, 2021 and the 5 years with daily lowest minimum:
          (2012, 2020, 2019, 2016 & 2007)

Source: https://ads.nipr.ac.jp/vishop/#/extent.
« Last Edit: January 16, 2021, 05:57:35 AM by Juan C. García »
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #55 on: January 16, 2021, 10:39:27 AM »
JAXA ARCTIC SEA ICE EXTENT:  13,003,003 KM2 as at 15-Jan-2021

- Extent gain on this day 60k, 0 k less than the average gain on this day (of the last 10 years) of 60k,
- Extent gain from minimum on this date is 9,448 k, which is 814 k, 9% more than the 10 year average of 8,634 k.

- Extent is at position #8 in the satellite record

- Extent is  12 k LESS than 2020,
- Extent is  374 k MORE than  2018,
- Extent is  582 k MORE than 2017
- Extent is  137 k LESS than 2013
- Extent is  50 k LESS than the 2010's Average
_____________________________________________
On average 87.0% of extent gains  from minimum to maximum done, and 52 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 14.29 million km2, 0.42 million km2 above the March 2017 record low maximum of 13.88 million km2.
_______________________________________________________________
N.B. Click on image to enlarge
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #56 on: January 16, 2021, 02:26:15 PM »
NSIDC Total AREA as at 15-Jan-2021 (5 day trailing average) 11,501,759 KM2         
         
Total Area         
 11,501,759    km2      
-318,177    km2   <   2010's average.
-454,053    km2   <   2020
 405,100    km2   >   2017
         
Total Change    63    k   gain
Peripheral Seas    50    k   gain
Central Seas___    12    k   gain
         
Peripheral Seas         
Okhotsk______    12    k   gain
Bering _______    15    k   gain
Hudson Bay___   -9    k   loss
Baffin  Bay____    14    k   gain
St Lawrence___   -1    k   loss
Greenland____    1    k   gain
Barents ______    19    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______   -9    k   loss
Beaufort_____    0    k   gain
CAA_________    0    k   gain
East Siberian__   -4    k   loss
Central Arctic_    11    k   gain
Laptev_______    1    k   gain
Kara_________    13    k   gain
         
Sea ice area gain on this day 63 k, 24 k more than the 2010's average gain of 39 k         
         
- Area is at position #2 in the satellite record.         
- Area is 318 k less than the 2010's average         
- Area is 405 k more than 2017         
- Area is 203 k less than 2016         
- Area is 454 k less than 2020          
- Area is 832 k less than 2012         
___________________________________________         
NSIDC Total EXTENT as at 15-Jan-2021 (5 day trailing average) 13,202,986 KM2         
         
NSIDC Sea ice EXTENT gain on this day 65 k, 25 k more than the 2010's average gain of 40k         
         
- EXTENT is at position #4 in the satellite record.         
- EXTENT is 79 k less than the 2010's average         
- EXTENT is 425 k more than 2017         
- EXTENT is 142 k less than 2016         
- EXTENT is 121 k less than 2020          
- EXTENT is 475 k less than 2012         
___________________________________________         
Note: Click an image for full-size         
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #57 on: January 16, 2021, 08:22:12 PM »
from NSIDC Data

There is usually a record breaker somewhere. The St Lawrence is at record low sea ice for the time of year both in Area (4 days) and in Extent (2 days).

Given that this sea is very much the smallest sea with the max sea ice extent in March well below 200 k in recent years, it will probably not be that significant is the wider scheme of things.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Juan C. García

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Re: 2021 Sea ice area and extent data
« Reply #58 on: January 17, 2021, 04:45:05 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

January 16th, 2021:
     13,085,288 km2, an increase of 82,285 km2.
     2021 is now 9th lowest on record.
     In the graph are today's 15 lowest years.
     Highlighted 2010's average, 2021 and the 5 years with daily lowest minimum:
          (2012, 2020, 2019, 2016 & 2007)

Source: https://ads.nipr.ac.jp/vishop/#/extent.
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #59 on: January 17, 2021, 11:40:10 AM »
JAXA ARCTIC SEA ICE EXTENT:  13,085,288 KM2 as at 16-Jan-2021

- Extent gain on this day 82k, 35 k more than the average gain on this day (of the last 10 years) of 47k,
- Extent gain from minimum on this date is 9,530 k, which is 850 k, 10% more than the 10 year average of 8,681 k.

- Extent is at position #9 in the satellite record

- Extent is  22 k MORE than 2020,
- Extent is  422 k MORE than  2018,
- Extent is  588 k MORE than 2017
- Extent is  162 k LESS than 2013
- Extent is  90 k LESS than the 2010's Average
_____________________________________________
On average 87.4% of extent gains  from minimum to maximum done, and 51 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 14.33 million km2, 0.46 million km2 above the March 2017 record low maximum of 13.88 million km2.
_______________________________________________________________
N.B. Click on image to enlarge
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #60 on: January 17, 2021, 02:35:36 PM »
NSIDC Total AREA as at 16-Jan-2021 (5 day trailing average) 11,569,572 KM2         
         
Total Area         
 11,569,572    km2      
-284,124    km2   <   2010's average.
-430,810    km2   <   2020
 468,935    km2   >   2017
         
Total Change    68    k   gain
Peripheral Seas    54    k   gain
Central Seas___    14    k   gain
         
Peripheral Seas         
Okhotsk______    14    k   gain
Bering _______    15    k   gain
Hudson Bay___   -13    k   loss
Baffin  Bay____    13    k   gain
St Lawrence___    1    k   gain
Greenland____    5    k   gain
Barents ______    19    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______   -8    k   loss
Beaufort_____    2    k   gain
CAA_________   -0    k   loss
East Siberian__   -5    k   loss
Central Arctic_    3    k   gain
Laptev_______    1    k   gain
Kara_________    22    k   gain
         
Sea ice area gain on this day 68 k, 34 k more than the 2010's average gain of 34 k         
         
- Area is at position #2 in the satellite record.         
- Area is 284 k less than the 2010's average         
- Area is 469 k more than 2017         
- Area is 149 k less than 2016         
- Area is 431 k less than 2020          
- Area is 722 k less than 2012         
___________________________________________         
NSIDC Total EXTENT as at 16-Jan-2021 (5 day trailing average) 13,292,436 KM2         
         
NSIDC Sea ice EXTENT gain on this day 89 k, 56 k more than the 2010's average gain of 33k         
         
- EXTENT is at position #4 in the satellite record.         
- EXTENT is 23 k less than the 2010's average         
- EXTENT is 512 k more than 2017         
- EXTENT is 54 k less than 2016         
- EXTENT is 84 k less than 2020          
- EXTENT is 365 k less than 2012         
___________________________________________         
Note: Click an image for full-size         
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Juan C. García

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Re: 2021 Sea ice area and extent data
« Reply #61 on: January 18, 2021, 04:57:32 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

January 17th, 2021:
     13,151,810 km2, an increase of 66,522 km2.
     2021 is now 10th lowest on record.
     In the graph are today's 15 lowest years.
     Highlighted 2010's average, 2021 and the 5 years with daily lowest minimum:
          (2012, 2020, 2019, 2016 & 2007)

Source: https://ads.nipr.ac.jp/vishop/#/extent.
« Last Edit: January 18, 2021, 05:05:57 AM by Juan C. García »
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #62 on: January 18, 2021, 09:08:42 AM »
JAXA ARCTIC SEA ICE EXTENT:  13,151,810 KM2 as at 17-Jan-2021

- Extent gain on this day 67k, 37 k more than the average gain on this day (of the last 10 years) of 30k,
- Extent gain from minimum on this date is 9,597 k, which is 886 k, 10% more than the 10 year average of 8,711 k.

- Extent is at position #10 in the satellite record

- Extent is  32 k MORE than 2020,
- Extent is  477 k MORE than  2018,
- Extent is  549 k MORE than 2017
- Extent is  163 k LESS than 2013
- Extent is  133 k LESS than the 2010's Average
_____________________________________________
On average 87.7% of extent gains  from minimum to maximum done, and 50 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 14.38 million km2, 0.50 million km2 above the March 2017 record low maximum of 13.88 million km2.
_______________________________________________________________
In the last 2 days extent has gone down from 8th to 10th lowest in the satellite record.
_______________________________________________________________
N.B. Click on image to enlarge
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #63 on: January 18, 2021, 02:55:52 PM »
NSIDC Total AREA as at 17-Jan-2021 (5 day trailing average) 11,632,370 KM2         
         
Total Area         
 11,632,370    km2      
-256,803    km2   <   2010's average.
-399,763    km2   <   2020
 500,118    km2   >   2017
         
Total Change    63    k   gain
Peripheral Seas    41    k   gain
Central Seas___    22    k   gain
         
Peripheral Seas         
Okhotsk______    11    k   gain
Bering _______    14    k   gain
Hudson Bay___   -11    k   loss
Baffin  Bay____    6    k   gain
St Lawrence___    8    k   gain
Greenland____   -2    k   loss
Barents ______    16    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______   -4    k   loss
Beaufort_____    3    k   gain
CAA_________   -1    k   loss
East Siberian__   -4    k   loss
Central Arctic_   -2    k   loss
Laptev_______    0    k   gain
Kara_________    29    k   gain
         
Sea ice area gain on this day 63 k, 28 k more than the 2010's average gain of 35 k         
         
- Area is at position #3 in the satellite record.         
- Area is 257 k less than the 2010's average         
- Area is 500 k more than 2017         
- Area is 128 k less than 2016         
- Area is 400 k less than 2020          
- Area is 597 k less than 2012         
___________________________________________         
NSIDC Total EXTENT as at 17-Jan-2021 (5 day trailing average) 13,389,894 KM2         
         
NSIDC Sea ice EXTENT gain on this day 97 k, 61 k more than the 2010's average gain of 36k         
         
- EXTENT is at position #6 in the satellite record.         
- EXTENT is 39 k more than the 2010's average         
- EXTENT is 584 k more than 2017         
- EXTENT is 20 k more than 2016         
- EXTENT is 61 k less than 2020          
- EXTENT is 230 k less than 2012
______________________________________________
strong daily area and extent gains starting to send extent and area down the rankings.      
___________________________________________         
Note: Click an image for full-size         
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Juan C. García

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Re: 2021 Sea ice area and extent data
« Reply #64 on: January 19, 2021, 04:40:48 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

January 18th, 2021:
     13,175,387 km2, an increase of 23,577 km2.
     2021 is 10th lowest on record.
     In the graph are today's 15 lowest years.
     Highlighted 2010's average, 2021 and the 5 years with daily lowest minimum:
          (2012, 2020, 2019, 2016 & 2007)

Source: https://ads.nipr.ac.jp/vishop/#/extent.
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #65 on: January 19, 2021, 11:17:03 AM »
JAXA ARCTIC SEA ICE EXTENT:  13,175,387 KM2 as at 18-Jan-2021

- Extent gain on this day 24k, 1 k more than the average gain on this day (of the last 10 years) of 23k,
- Extent gain from minimum on this date is 9,621 k, which is 887 k, 10% more than the 10 year average of 8,734 k.

- Extent is at position #10 in the satellite record

- Extent is  1 k MORE than 2020,
- Extent is  475 k MORE than  2018,
- Extent is  529 k MORE than 2017
- Extent is  123 k LESS than 2013
- Extent is  135 k LESS than the 2010's Average
_____________________________________________
On average 87.9% of extent gains  from minimum to maximum done, and 49 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 14.38 million km2, 0.50 million km2 above the March 2017 record low maximum of 13.88 million km2.
_______________________________________________________________
N.B. Click on image to enlarge
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #66 on: January 19, 2021, 02:30:35 PM »
NSIDC Total AREA as at 18-Jan-2021 (5 day trailing average) 11,678,633 KM2         
         
Total Area         
 11,678,633    km2      
-240,795    km2   <   2010's average.
-387,477    km2   <   2020
 526,137    km2   >   2017
         
Total Change    46    k   gain
Peripheral Seas    19    k   gain
Central Seas___    27    k   gain
         
Peripheral Seas         
Okhotsk______    5    k   gain
Bering _______    10    k   gain
Hudson Bay___   -8    k   loss
Baffin  Bay____    1    k   gain
St Lawrence___    3    k   gain
Greenland____   -6    k   loss
Barents ______    14    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______    2    k   gain
Beaufort_____    3    k   gain
CAA_________    1    k   gain
East Siberian__   -2    k   loss
Central Arctic_   -6    k   loss
Laptev_______    0    k   gain
Kara_________    29    k   gain
         
Sea ice area gain on this day 46 k, 16 k more than the 2010's average gain of 30 k         
         
- Area is at position #3 in the satellite record.         
- Area is 241 k less than the 2010's average         
- Area is 526 k more than 2017         
- Area is 124 k less than 2016         
- Area is 387 k less than 2020          
- Area is 490 k less than 2012         
___________________________________________         
NSIDC Total EXTENT as at 18-Jan-2021 (5 day trailing average) 13,468,621 KM2         
         
NSIDC Sea ice EXTENT gain on this day 79 k, 48 k more than the 2010's average gain of 31k         
         
- EXTENT is at position #7 in the satellite record.         
- EXTENT is 87 k more than the 2010's average         
- EXTENT is 627 k more than 2017         
- EXTENT is 90 k more than 2016         
- EXTENT is 50 k less than 2020          
- EXTENT is 116 k less than 2012         
___________________________________________         
Note: Click an image for full-size         
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

Juan C. García

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Re: 2021 Sea ice area and extent data
« Reply #67 on: Today at 04:46:18 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

January 19th, 2021:
     13,129,485 km2, a drop of -45,902 km2.
     2021 is now 7th lowest on record.
     In the graph are today's 15 lowest years.
     Highlighted 2010's average, 2021 and the 5 years with daily lowest minimum:
          (2012, 2020, 2019, 2016 & 2007)

Source: https://ads.nipr.ac.jp/vishop/#/extent.
Which is the best answer to Sep-2012 ASI lost (compared to 1979-2000)?
50% [NSIDC Extent] or
73% [PIOMAS Volume]

Volume is harder to measure than extent, but 3-dimensional space is real, 2D's hide ~50% thickness gone.
-> IPCC/NSIDC trends [based on extent] underestimate the real speed of ASI lost.

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #68 on: Today at 11:20:15 AM »
JAXA ARCTIC SEA ICE EXTENT:  13,129,485 KM2 as at 19-Jan-2021

- Extent loss on this day 46k, 94 k less than the average gain on this day (of the last 10 years) of 48k,
- Extent gain from minimum on this date is 9,575 k, which is 792 k, 9% more than the 10 year average of 8,782 k.

- Extent is at position #7 in the satellite record

- Extent is  131 k LESS than 2020,
- Extent is  404 k MORE than  2018,
- Extent is  361 k MORE than 2017
- Extent is  195 k LESS than 2013
- Extent is  47 k LESS than the 2010's Average
_____________________________________________
On average 88.3% of extent gains  from minimum to maximum done, and 48 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 14.29 million km2, 0.41 million km2 above the March 2017 record low maximum of 13.88 million km2.
_______________________________________________________________
An unexpected significant sea ice loss on this day sends extent from 10th lowest to 7th lowest.
A one-off or the beginning of a significant sea change?

_______________________________________________________________
N.B. Click on image to enlarge
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)

gerontocrat

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Re: 2021 Sea ice area and extent data
« Reply #69 on: Today at 02:18:47 PM »
NSIDC Total AREA as at 19-Jan-2021 (5 day trailing average) 11,707,818 KM2         
         
Total Area         
 11,707,818    km2      
-239,723    km2   <   2010's average.
-396,092    km2   <   2020
 527,869    km2   >   2017
         
Total Change    29    k   gain
Peripheral Seas    10    k   gain
Central Seas___    19    k   gain
         
Peripheral Seas         
Okhotsk______    0    k   gain
Bering _______    10    k   gain
Hudson Bay___   -2    k   loss
Baffin  Bay____   -4    k   loss
St Lawrence___    1    k   gain
Greenland____   -1    k   loss
Barents ______    7    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______    5    k   gain
Beaufort_____    0    k   gain
CAA_________    0    k   gain
East Siberian__    1    k   gain
Central Arctic_   -7    k   loss
Laptev_______    0    k   gain
Kara_________    19    k   gain
         
Sea ice area gain on this day 29 k, 1 k more than the 2010's average gain of 28 k         
         
- Area is at position #3 in the satellite record.         
- Area is 240 k less than the 2010's average         
- Area is 528 k more than 2017         
- Area is 127 k less than 2016         
- Area is 396 k less than 2020          
- Area is 417 k less than 2012         
___________________________________________         
NSIDC Total EXTENT as at 19-Jan-2021 (5 day trailing average) 13,519,326 KM2         
         
NSIDC Sea ice EXTENT gain on this day 51 k, 17 k more than the 2010's average gain of 34k         
         
- EXTENT is at position #7 in the satellite record.         
- EXTENT is 104 k more than the 2010's average         
- EXTENT is 614 k more than 2017         
- EXTENT is 123 k more than 2016         
- EXTENT is 67 k less than 2020          
- EXTENT is 30 k less than 2012      
________________________________________
There was a big drop in NSIDC daily extent on this day - 108k.
JAXA extent also dropped. What's going on?   Just a blip?

___________________________________________         
Note: Click an image for full-size         
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
"Damn, I wanted to see what happened next" (Epitaph)