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Author Topic: 2020 Sea ice area and extent data  (Read 407053 times)

Juan C. García

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Re: 2020 Sea ice area and extent data
« Reply #1600 on: September 20, 2020, 05:39:38 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

September 17th, 2020:
     3,734,834 km2, a 100K+ increase of 104,616 km2. (confirmed)
September 18th, 2020:
     3,745,309 km2, an increase of 10,475 km2.

September 19th, 2020:
     3,723,586 km2, a drop of -21,723 km2.
     2020 is 2nd lowest on record on this date.
     Highlighted 2020 & the 4 years with a daily lowest min in Sept. (2012, 2019, 2016 & 2007).
     In the graph are today's 10 lowest years.
     Source: https://ads.nipr.ac.jp/vishop/#/extent
« Last Edit: September 20, 2020, 05:51:21 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: 2020 Sea ice area and extent data
« Reply #1601 on: September 20, 2020, 11:15:36 AM »
JAXA ARCTIC SEA ICE EXTENT:  3,723,586 KM2 as at 19-Sep-2020

- Extent LOSS on this day 22k, 51 k less than the average gain on this day (of the last 10 years) of 29k,
- Extent gain from minimum on this date is 169 k, which is 87 k, 105.8%, more than the 10 year average of 82 k.
- Extent is at position #2 in the satellite record
- Extent is  287 k LESS than 2019,
- Extent is  695 k LESS than 2016,
- Extent is  353 k MORE than 2012
- Extent is  375 k LESS than 2007
_____________________________________________
On average 0.8% of extent gains  from minimum to maximum done, and 173 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 13.51 million km2, 0.37 million km2 below the March 2017 record low maximum of 13.88 million km2.
______________________________
N.B. Click  on 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: 2020 Sea ice area and extent data
« Reply #1602 on: September 20, 2020, 02:24:20 PM »
NSIDC Total Area as at 19-Sep-2020 (5 day trailing average) 2,666,410 KM2         
         
Total Area         
 2,666,410    km2      
-583,011    km2   <   2010's average.
-461,471    km2   <   2019
-1,452,088    km2   <   2000's average.
         
Total Change    28    k   gain
Peripheral Seas    8    k   gain
Central Seas___    20    k   gain
         
Peripheral Seas         
Okhotsk______    0    k   gain
Bering _______    0    k   gain
Hudson Bay___   -0    k   loss
Baffin  Bay____   -0    k   loss
St Lawrence___    -    k   loss
Greenland____    8    k   gain
Barents ______   -0    k   loss
         
Central Arctic  Ocean Seas         
Chukchi______    0    k   gain
Beaufort_____    6    k   gain
CAA_________   -2    k   loss
East Siberian__   -1    k   loss
Central Arctic_    18    k   gain
Laptev_______   -0    k   loss
Kara_________   -0    k   loss
         
Sea ice area gain on this day 28 k, 6 k more than the 2010's average gain of 22 k         
         
- 2020 area is at position #2 in the satellite record.         
- 2020 Area is 583 k less than the 2010's average         
- 2020 Area is 1,452 k less than the 2000's average         
- 2020 Area is 135 k less than 2016         
- 2020 Area is 461 k less than 2019          
- 2020 Area is 354 k more than 2012      
___________________________________________         
NSIDC Total EXTENT as at 19-Sep-2020 (5 day trailing average) 3,790,945 KM2         
         
NSIDC Sea ice EXTENT gain on this day 11 k, 2 k more than the 2010's average gain of 9k         
         
- 2020 EXTENT is at position #2 in the satellite record.         
- 2020 EXTENT is 736 k less than the 2010's average         
- 2020 EXTENT is 1,745 k less than the 2000's average         
- 2020 EXTENT is 605 k less than 2016         
- 2020 EXTENT is 407 k less than 2019          
- 2020 EXTENT is 373 k more than 2012
_________________________________________
No surprises today. I thinks its time to look at what the rest of the year might bring. Tomorrow.         
___________________________________________         
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: 2020 Sea ice area and extent data
« Reply #1603 on: September 21, 2020, 05:34:59 AM »
[ADS NIPR VISHOP (JAXA)] Arctic Sea Ice Extent.

September 20th, 2020:
     3,723,271 km2, a small drop of -315 km2.
     2020 is 2nd lowest on record on this date.
     Highlighted 2020 & the 4 years with a daily lowest min in Sept. (2012, 2019, 2016 & 2007).
     In the graph are today's 10 lowest years.
     Source: https://ads.nipr.ac.jp/vishop/#/extent
« Last Edit: September 21, 2020, 05:54:52 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: 2020 Sea ice area and extent data
« Reply #1604 on: September 21, 2020, 10:56:37 AM »
JAXA ARCTIC SEA ICE EXTENT:  3,723,271 KM2 as at 20-Sep-2020

- Extent gain on this day 0k, 39 k less than the average gain on this day (of the last 10 years) of 39k,
- Extent gain from minimum on this date is 168 k, which is 86 k, 105.5% more than the 10 year average of 82 k.
- Extent is at position #2 in the satellite record
- Extent is  331 k LESS than 2019,
- Extent is  735 k LESS than 2016,
- Extent is  296 k MORE than 2012
- Extent is  392 k LESS than 2007
_____________________________________________
On average 0.8% of extent gains  from minimum to maximum done, and 172 days to maximum

Projections. (Table JAXA-Arc1)

Average remaining extent gain (of the last 10 years) would produce a maximum in March 2021 of 13.47 million km2, 0.41 million km2 below the March 2017 record low maximum of 13.88 million km2.
_____________________________________________
Is a 22k extent loss followed by zero change a hint that refreeze may be slowed for a month or three? 
______________________________
N.B. Click  on 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: 2020 Sea ice area and extent data
« Reply #1605 on: September 21, 2020, 02:31:56 PM »
NSIDC Total Area as at 20-Sep-2020 (5 day trailing average) 2,718,365 KM2         
         
Total Area         
 2,718,365    km2      
-554,510    km2   <   2010's average.
-487,363    km2   <   2019
-1,417,217    km2   <   2000's average.
         
Total Change    52    k   gain
Peripheral Seas    6    k   gain
Central Seas___    45    k   gain
         
Peripheral Seas         
Okhotsk______    0    k   gain
Bering _______    0    k   gain
Hudson Bay___    0    k   gain
Baffin  Bay____   -1    k   loss
St Lawrence___    -    k   loss
Greenland____    7    k   gain
Barents ______    0    k   gain
         
Central Arctic  Ocean Seas         
Chukchi______   -0    k   loss
Beaufort_____    7    k   gain
CAA_________    0    k   gain
East Siberian__   -2    k   loss
Central Arctic_    40    k   gain
Laptev_______   -0    k   loss
Kara_________    1    k   gain
         
Sea ice area gain on this day 52 k, 29 k more than the 2010's average gain of 23 k         
         
- 2020 area is at position #2 in the satellite record.         
- 2020 Area is 555 k less than the 2010's average         
- 2020 Area is 1,417 k less than the 2000's average         
- 2020 Area is 95 k less than 2016         
- 2020 Area is 487 k less than 2019          
- 2020 Area is 359 k more than 2012         
___________________________________________         
NSIDC Total EXTENT as at 20-Sep-2020 (5 day trailing average) 3,812,841 KM2         
         
NSIDC Sea ice EXTENT gain on this day 22 k, 7 k more than the 2010's average gain of 15k         
         
- 2020 EXTENT is at position #2 in the satellite record.         
- 2020 EXTENT is 730 k less than the 2010's average         
- 2020 EXTENT is 1,730 k less than the 2000's average         
- 2020 EXTENT is 614 k less than 2016         
- 2020 EXTENT is 398 k less than 2019          
- 2020 EXTENT is 356 k more 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)