Author Topic: Global sea ice area and extent data (Read 224340 times)

gerontocrat · « **Reply #1050 on:** March 18, 2021, 12:58:11 PM »

JAXA GLOBAL SEA ICE EXTENT: 18,643,939 KM2 as at 17-Mar-2021

- Extent gain on this day 109k, 59 k more than the average gain on this day (of the last 10 years) of 50k,
- Extent gain from minimum on this date is 2.12 million km2, 0.56 million km2, 35.9% more than the 10 year average gain of 1.56 million km2.
- Extent is at position #12 in the satellite record of which 1 years were in the last century

- 2021 Extent is 0.45 million km2 MORE than 2010's Average
- 2020 Extent is 0.28 million km2 MORE than 2020

On average 17.5% of sea ice gain from minimum to maximum done, and 232 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.98 million km2, 2.22 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1051 on:** March 19, 2021, 11:37:47 AM »

JAXA GLOBAL SEA ICE EXTENT: 18,718,638 KM2 as at 18-Mar-2021

- Extent gain on this day 75k, 12 k more than the average gain on this day (of the last 10 years) of 63k,
- Extent gain from minimum on this date is 2.19 million km2, 0.57 million km2, 35.3% more than the 10 year average gain of 1.62 million km2.
- Extent is at position #11 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.46 million km2 MORE than 2010's Average
- 2020 Extent is 0.36 million km2 MORE than 2020

On average 18.2% of sea ice gain from minimum to maximum done, and 231 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.99 million km2, 2.23 million km2 above the 2016 record low maximum of 23.76 million km2.
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Despite an above average daily extent gain on this day extent rises from 12th lowest to 11th lowest in the satellite record.
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gerontocrat · « **Reply #1052 on:** March 20, 2021, 11:08:16 AM »

JAXA GLOBAL SEA ICE EXTENT: 18,796,361 KM2 as at 19-Mar-2021

- Extent gain on this day 78k, 18 k more than the average gain on this day (of the last 10 years) of 60k,
- Extent gain from minimum on this date is 2.27 million km2, 0.59 million km2, 35.1% more than the 10 year average gain of 1.68 million km2.
- Extent is at position #11 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.48 million km2 MORE than 2010's Average
- 2020 Extent is 0.39 million km2 MORE than 2020

On average 18.9% of sea ice gain from minimum to maximum done, and 230 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 26.01 million km2, 2.25 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1053 on:** March 21, 2021, 10:08:43 AM »

JAXA GLOBAL SEA ICE EXTENT: 18,874,358 KM2 as at 20-Mar-2021

- Extent gain on this day 78k, 25 k more than the average gain on this day (of the last 10 years) of 53k,
- Extent gain from minimum on this date is 2.35 million km2, 0.62 million km2, 35.5% more than the 10 year average gain of 1.73 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.51 million km2 MORE than 2010's Average
- 2020 Extent is 0.42 million km2 MORE than 2020

On average 19.5% of sea ice gain from minimum to maximum done, and 229 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 26.03 million km2, 2.27 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1054 on:** March 22, 2021, 10:01:39 AM »

JAXA GLOBAL SEA ICE EXTENT: 18,919,489 KM2 as at 21-Mar-2021

- Extent gain on this day 45k, 7 k less than the average gain on this day (of the last 10 years) of 52k,
- Extent gain from minimum on this date is 2.40 million km2, 0.61 million km2, 34.1% more than the 10 year average gain of 1.79 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.51 million km2 MORE than 2010's Average
- 2020 Extent is 0.44 million km2 MORE than 2020

On average 20.1% of sea ice gain from minimum to maximum done, and 228 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 26.03 million km2, 2.26 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1055 on:** March 23, 2021, 09:15:22 AM »

JAXA GLOBAL SEA ICE EXTENT: 18,982,371 KM2 as at 22-Mar-2021

- Extent gain on this day 63k, 8 k more than the average gain on this day (of the last 10 years) of 55k,
- Extent gain from minimum on this date is 2.46 million km2, 0.62 million km2, 33.5% more than the 10 year average gain of 1.84 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.52 million km2 MORE than 2010's Average
- 2020 Extent is 0.49 million km2 MORE than 2020

On average 20.7% of sea ice gain from minimum to maximum done, and 227 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 26.03 million km2, 2.27 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1056 on:** March 24, 2021, 12:53:26 PM »

JAXA GLOBAL SEA ICE EXTENT: 19,007,759 KM2 as at 23-Mar-2021

- Extent gain on this day 25k, 26 k less than the average gain on this day (of the last 10 years) of 51k,
- Extent gain from minimum on this date is 2.48 million km2, 0.59 million km2, 31.3% more than the 10 year average gain of 1.89 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.49 million km2 MORE than 2010's Average
- 2020 Extent is 0.52 million km2 MORE than 2020

On average 21.3% of sea ice gain from minimum to maximum done, and 226 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 26.01 million km2, 2.25 million km2 above the 2016 record low maximum of 23.76 million km2.
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On the way we will have a false maximum in late June/ early July, followed by false minimum in early September.

N.B. In 2016 the maximum for the year was reached on the 7th July. i.e. the November maximum was less than the “false” maximum.
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gerontocrat · « **Reply #1057 on:** March 25, 2021, 10:51:45 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,051,205 KM2 as at 24-Mar-2021

- Extent gain on this day 43k, 1 k less than the average gain on this day (of the last 10 years) of 44k,
- Extent gain from minimum on this date is 2.53 million km2, 0.59 million km2, 30.5% more than the 10 year average gain of 1.94 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.47 million km2 MORE than 2010's Average
- 2020 Extent is 0.62 million km2 MORE than 2020

On average 21.8% of sea ice gain from minimum to maximum done, and 225 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 26.01 million km2, 2.25 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1058 on:** March 26, 2021, 10:05:42 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,087,393 KM2 as at 25-Mar-2021

- Extent gain on this day 36k, 34 k less than the average gain on this day (of the last 10 years) of 70k,
- Extent gain from minimum on this date is 2.56 million km2, 0.56 million km2, 27.7% more than the 10 year average gain of 2.01 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.41 million km2 MORE than 2010's Average
- 2020 Extent is 0.73 million km2 MORE than 2020

On average 22.6% of sea ice gain from minimum to maximum done, and 224 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.97 million km2, 2.21 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1059 on:** March 27, 2021, 09:25:23 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,146,070 KM2 as at 26-Mar-2021

- Extent gain on this day 59k, 17 k less than the average gain on this day (of the last 10 years) of 76k,
- Extent gain from minimum on this date is 2.62 million km2, 0.54 million km2, 25.9% more than the 10 year average gain of 2.08 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.38 million km2 MORE than 2010's Average
- 2020 Extent is 0.75 million km2 MORE than 2020

On average 23.4% of sea ice gain from minimum to maximum done, and 223 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.96 million km2, 2.19 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1060 on:** March 28, 2021, 11:42:34 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,223,286 KM2 as at 27-Mar-2021

- Extent gain on this day 77k, 19 k less than the average gain on this day (of the last 10 years) of 96k,
- Extent gain from minimum on this date is 2.70 million km2, 0.52 million km2, 23.9% more than the 10 year average gain of 2.18 million km2.
- Extent is at position #12 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.36 million km2 MORE than 2010's Average
- 2020 Extent is 0.77 million km2 MORE than 2020

On average 24.5% of sea ice gain from minimum to maximum done, and 222 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.94 million km2, 2.18 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1061 on:** March 29, 2021, 09:22:55 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,243,932 KM2 as at 28-Mar-2021

- Extent gain on this day 21k, 34 k less than the average gain on this day (of the last 10 years) of 55k,
- Extent gain from minimum on this date is 2.72 million km2, 0.49 million km2, 21.8% more than the 10 year average gain of 2.23 million km2.
- Extent is at position #13 in the satellite record of which 1 years were in the last century

- 2021 Extent is 0.32 million km2 MORE than 2010's Average
- 2020 Extent is 0.74 million km2 MORE than 2020

On average 25.1% of sea ice gain from minimum to maximum done, and 221 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.90 million km2, 2.14 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1062 on:** March 30, 2021, 08:21:00 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,205,363 KM2 as at 29-Mar-2021

- Extent loss on this day 39k, 88 k less than the average gain on this day (of the last 10 years) of 49k,
- Extent gain from minimum on this date is 2.68 million km2, 0.40 million km2, 17.4% more than the 10 year average gain of 2.28 million km2.
- Extent is at position #11 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.24 million km2 MORE than 2010's Average
- 2020 Extent is 0.53 million km2 MORE than 2020

On average 25.7% of sea ice gain from minimum to maximum done, and 220 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.81 million km2, 2.05 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1063 on:** March 31, 2021, 09:52:44 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,148,633 KM2 as at 30-Mar-2021

- Extent loss on this day 57k, 101 k less than the average gain on this day (of the last 10 years) of 44k,
- Extent gain from minimum on this date is 2.62 million km2, 0.30 million km2, 12.8% more than the 10 year average gain of 2.33 million km2.
- Extent is at position #10 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.13 million km2 MORE than 2010's Average
- 2020 Extent is 0.38 million km2 MORE than 2020

On average 26.2% of sea ice gain from minimum to maximum done, and 219 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.71 million km2, 1.95 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1064 on:** April 01, 2021, 08:29:51 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,208,491 KM2 as at 31-Mar-2021

- Extent gain on this day 60k, 15 k less than the average gain on this day (of the last 10 years) of 75k,
- Extent gain from minimum on this date is 2.68 million km2, 0.28 million km2, 11.7% more than the 10 year average gain of 2.40 million km2.
- Extent is at position #10 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.10 million km2 MORE than 2010's Average
- 2020 Extent is 0.37 million km2 MORE than 2020

On average 27.0% of sea ice gain from minimum to maximum done, and 218 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.70 million km2, 1.94 million km2 above the 2016 record low maximum of 23.76 million km2.
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On the way we will have a false maximum in late June/ early July, followed by false minimum in early September.

N.B. In 2016 the maximum for the year was reached on the 7th July. i.e. the November maximum was less than the “false” maximum.
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Stephan · « **Reply #1065 on:** April 01, 2021, 09:08:48 AM »

I compared the actual JAXA data with the averages of the last decades.
In the Arctic 2021 is 10 days ahead of the 2010s average, in the Antarctic it is 5 days ahead of the 2010s average. This sums up to 10d - 5d = 5 days.
Compared with earlier decades the difference is even higher:
Decade Arctic Antarctica sum
2010s +10 +5 5 d
2000s +19 +1 18 d
1990s +29 +1 28 d
1980s +39 +5 34 d
This means for the Arctic more insolation and less melting heat needed in the coming months, whereas for the Antarctic less insolation and less freezing heat to be released, but the net effect is much larger in the Arctic than in the Antarctic. Whereas there is a clear trend in the Arctic (greater shift compared to earlier decades) no long-term trend is visible in the seas around Antarctica.

gerontocrat · « **Reply #1066 on:** April 01, 2021, 09:59:12 AM »

JAXA Global sea ice extent data

Trends in global sea ice are currently mostly to do with the recent rise in Antarctic sea ice.
The March monthly average (graph attached) shows the March '21 average at 18.554 million km2, 12th lowest in the satellite record, 545k km2 above the linear trend, and 450k km2 above March '20.

This is reflected in the strong rise in the 365 day trailing average extent.

click images to enlarge

gerontocrat · « **Reply #1067 on:** April 02, 2021, 10:41:29 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,343,429 KM2 as at 01-Apr-2021

- Extent gain on this day 135k, 69 k more than the average gain on this day (of the last 10 years) of 66k,
- Extent gain from minimum on this date is 2.82 million km2, 0.35 million km2, 14.2% more than the 10 year average gain of 2.47 million km2.
- Extent is at position #11 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.17 million km2 MORE than 2010's Average
- 2020 Extent is 0.48 million km2 MORE than 2020

On average 27.8% of sea ice gain from minimum to maximum done, and 217 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.77 million km2, 2.01 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1068 on:** April 03, 2021, 01:44:22 PM »

JAXA GLOBAL SEA ICE EXTENT: 19,462,676 KM2 as at 02-Apr-2021

- Extent gain on this day 119k, 66 k more than the average gain on this day (of the last 10 years) of 53k,
- Extent gain from minimum on this date is 2.94 million km2, 0.42 million km2, 16.6% more than the 10 year average gain of 2.52 million km2.
- Extent is at position #11 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.23 million km2 MORE than 2010's Average
- 2020 Extent is 0.55 million km2 MORE than 2020

On average 28.3% of sea ice gain from minimum to maximum done, and 216 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.83 million km2, 2.07 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1069 on:** April 04, 2021, 10:24:36 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,559,359 KM2 as at 03-Apr-2021

- Extent gain on this day 97k, 38 k more than the average gain on this day (of the last 10 years) of 59k,
- Extent gain from minimum on this date is 3.04 million km2, 0.46 million km2, 17.6% more than the 10 year average gain of 2.58 million km2.
- Extent is at position #11 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.27 million km2 MORE than 2010's Average
- 2020 Extent is 0.59 million km2 MORE than 2020

On average 29.0% of sea ice gain from minimum to maximum done, and 215 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.87 million km2, 2.11 million km2 above the 2016 record low maximum of 23.76 million km2.
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On the way we will have a false maximum in late June/ early July, followed by false minimum in early September.

N.B. In 2016 the maximum for the year was reached on the 7th July. i.e. the November maximum was less than the “false” maximum.
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Click an image to enlarge

gerontocrat · « **Reply #1070 on:** April 05, 2021, 11:46:16 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,565,340 KM2 as at 04-Apr-2021

- Extent gain on this day 6k, 37 k less than the average gain on this day (of the last 10 years) of 43k,
- Extent gain from minimum on this date is 3.04 million km2, 0.42 million km2, 15.9% more than the 10 year average gain of 2.62 million km2.
- Extent is at position #10 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.22 million km2 MORE than 2010's Average
- 2020 Extent is 0.57 million km2 MORE than 2020

On average 29.5% of sea ice gain from minimum to maximum done, and 214 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.83 million km2, 2.07 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1071 on:** April 06, 2021, 11:00:48 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,546,048 KM2 as at 05-Apr-2021

- Extent loss on this day 19k, 70 k less than the average gain on this day (of the last 10 years) of 51k,
- Extent gain from minimum on this date is 3.02 million km2, 0.35 million km2, 13.0% more than the 10 year average gain of 2.67 million km2.
- Extent is at position #10 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.15 million km2 MORE than 2010's Average
- 2020 Extent is 0.57 million km2 MORE than 2020

On average 30.1% of sea ice gain from minimum to maximum done, and 213 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.76 million km2, 2.00 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1072 on:** April 07, 2021, 10:53:47 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,557,501 KM2 as at 06-Apr-2021

- Extent gain on this day 11k, 53 k less than the average gain on this day (of the last 10 years) of 64k,
- Extent gain from minimum on this date is 3.03 million km2, 0.30 million km2, 10.8% more than the 10 year average gain of 2.74 million km2.
- Extent is at position #10 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.09 million km2 MORE than 2010's Average
- 2020 Extent is 0.55 million km2 MORE than 2020

On average 30.8% of sea ice gain from minimum to maximum done, and 212 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.71 million km2, 1.95 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1073 on:** April 08, 2021, 08:15:55 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,590,461 KM2 as at 07-Apr-2021

- Extent gain on this day 33k, 46 k less than the average gain on this day (of the last 10 years) of 79k,
- Extent gain from minimum on this date is 3.07 million km2, 0.25 million km2, 8.9% more than the 10 year average gain of 2.82 million km2.
- Extent is at position #10 in the satellite record of which 0 years were in the last century

- 2021 Extent is 0.04 million km2 MORE than 2010's Average
- 2020 Extent is 0.47 million km2 MORE than 2020

On average 31.7% of sea ice gain from minimum to maximum done, and 211 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.67 million km2, 1.90 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1074 on:** April 09, 2021, 09:23:14 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,595,547 KM2 as at 08-Apr-2021

- Extent gain on this day 5k, 73 k less than the average gain on this day (of the last 10 years) of 78k,
- Extent gain from minimum on this date is 3.07 million km2, 0.18 million km2, 6.1% more than the 10 year average gain of 2.89 million km2.
- Extent is at position #9 in the satellite record of which 0 years were in the last century

- 2021 Extent is -0.03 million km2 LESS than 2010's Average
- 2020 Extent is 0.46 million km2 MORE than 2020

On average 32.5% of sea ice gain from minimum to maximum done, and 210 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.59 million km2, 1.83 million km2 above the 2016 record low maximum of 23.76 million km2.
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A very high Arctic sea ice extent loss and a slightly below Antarctic sea ice extent gain produces an extremely low Global sea ice extent gain, and extent changes from 10th to 9th lowest in the satellite record.
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gerontocrat · « **Reply #1075 on:** April 10, 2021, 01:20:14 PM »

JAXA GLOBAL SEA ICE EXTENT: 19,561,732 KM2 as at 09-Apr-2021

- Extent loss on this day 34k, 120 k less than the average gain on this day (of the last 10 years) of 86k,
- Extent gain from minimum on this date is 3.04 million km2, 0.06 million km2, 1.9% more than the 10 year average gain of 2.98 million km2.
- Extent is at position #8 in the satellite record of which 0 years were in the last century

- 2021 Extent is -0.15 million km2 LESS than 2010's Average
- 2020 Extent is 0.39 million km2 MORE than 2020

On average 33.5% of sea ice gain from minimum to maximum done, and 209 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.47 million km2, 1.71 million km2 above the 2016 record low maximum of 23.76 million km2.
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On the way we will have a false maximum in late June/ early July, followed by false minimum in early September.

N.B. In 2016 the maximum for the year was reached on the 7th July. i.e. the November maximum was less than the “false” maximum.
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On this day a century Arcric sea ice extent loss and a well below average Antarctic sea ice extent gain results in an unusual (but not that rare) Global sea ice extent loss. Sea ice extent changed from 10th to 8th lowest in the last 2 days.
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gerontocrat · « **Reply #1076 on:** April 11, 2021, 11:36:48 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,566,536 KM2 as at 10-Apr-2021

- Extent gain on this day 5k, 81 k less than the average gain on this day (of the last 10 years) of 86k,
- Extent gain from minimum on this date is 3.04 million km2, 0.02 million km2, 0.8% less than the 10 year average gain of 3.07 million km2.
- Extent is at position #8 in the satellite record of which 0 years were in the last century

- 2021 Extent is -0.23 million km2 LESS than 2010's Average
- 2020 Extent is 0.35 million km2 MORE than 2020

On average 34.5% of sea ice gain from minimum to maximum done, and 208 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.39 million km2, 1.63 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1077 on:** April 12, 2021, 09:50:29 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,568,198 KM2 as at 11-Apr-2021

- Extent gain on this day 2k, 66 k less than the average gain on this day (of the last 10 years) of 68k,
- Extent gain from minimum on this date is 3.04 million km2, 0.09 million km2, 2.9% less than the 10 year average gain of 3.13 million km2.
- Extent is at position #8 in the satellite record of which 0 years were in the last century

- 2021 Extent is -0.29 million km2 LESS than 2010's Average
- 2020 Extent is 0.32 million km2 MORE than 2020

On average 35.3% of sea ice gain from minimum to maximum done, and 207 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.33 million km2, 1.56 million km2 above the 2016 record low maximum of 23.76 million km2.
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It is very high Arctic sea ice extent losses that is the major cause of the abrupt slowdown in Global sea ice extent gains.
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gerontocrat · « **Reply #1078 on:** April 13, 2021, 09:16:18 AM »

JAXA GLOBAL SEA ICE EXTENT: 19,660,654 KM2 as at 12-Apr-2021

- Extent gain on this day 92k, 17 k more than the average gain on this day (of the last 10 years) of 75k,
- Extent gain from minimum on this date is 3.14 million km2, 0.07 million km2, 2.3% less than the 10 year average gain of 3.21 million km2.
- Extent is at position #8 in the satellite record of which 0 years were in the last century

- 2021 Extent is -0.28 million km2 LESS than 2010's Average
- 2020 Extent is 0.39 million km2 MORE than 2020

On average 36.1% of sea ice gain from minimum to maximum done, and 206 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.34 million km2, 1.58 million km2 above the 2016 record low maximum of 23.76 million km2.
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Stephan · « **Reply #1079 on:** April 13, 2021, 08:01:52 PM »

I compared the actual JAXA data with the averages of the last decades.
In the Arctic 2021 is 13 days ahead of the 2010s average, in the Antarctic it is 2 days ahead of the 2010s average. This sums up to 13d - 2d = 11 days.
Compared with earlier decades the difference is even higher:
Decade Arctic Antarctica sum
2010s +13 +2 11 d
2000s +21 - 1 22 d
1990s +30 ±0 30 d
1980s +38 +3 35 d
This means for the Arctic more insolation and less melting heat needed in the coming months, whereas for the Antarctic less insolation and less freezing heat to be released, but the net effect is much larger in the Arctic than in the Antarctic. Whereas there is a clear trend in the Arctic (greater shift compared to earlier decades) no long-term trend is visible in the seas around Antarctica.

gerontocrat · « **Reply #1080 on:** April 14, 2021, 12:42:19 PM »

JAXA GLOBAL SEA ICE EXTENT: 19,844,369 KM2 as at 13-Apr-2021

- Extent gain on this day 184k, 95 k more than the average gain on this day (of the last 10 years) of 89k,
- Extent gain from minimum on this date is 3.32 million km2, 0.02 million km2, 0.6% more than the 10 year average gain of 3.30 million km2.
- Extent is at position #8 in the satellite record of which 0 years were in the last century

- 2021 Extent is -0.17 million km2 LESS than 2010's Average
- 2020 Extent is 0.49 million km2 MORE than 2020

On average 37.1% of sea ice gain from minimum to maximum done, and 205 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.44 million km2, 1.68 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1081 on:** April 16, 2021, 03:43:36 PM »

JAXA GLOBAL SEA ICE EXTENT: 20,244,036 KM2 as at 15-Apr-2021

- Extent gain on this day 182k, 124 k more than the average gain on this day (of the last 10 years) of 58k,
- Extent gain from minimum on this date is 3.72 million km2, 0.29 million km2, 8.6% more than the 10 year average gain of 3.43 million km2.
- Extent is at position #11 in the satellite record of which 1 years were in the last century

- 2021 Extent is 0.09 million km2 MORE than 2010's Average
- 2020 Extent is 0.77 million km2 MORE than 2020

On average 38.5% of sea ice gain from minimum to maximum done, and 203 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.71 million km2, 1.95 million km2 above the 2016 record low maximum of 23.76 million km2.
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On the way we will have a false maximum in late June/ early July, followed by false minimum in early September.

N.B. In 2016 the maximum for the year was reached on the 7th July. i.e. the November maximum was less than the “false” maximum.
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High to average Antarctic sea ice gains plus Arctic sea ice gains (vs normal losses) in the last 3 days sends global sea ice extent from 8th to 11th lowest in the satellite record.

The gain of 218k on the 14th was the 4th highest daily gain in April from 2002 to date.
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gerontocrat · « **Reply #1082 on:** April 17, 2021, 09:40:32 AM »

JAXA GLOBAL SEA ICE EXTENT: 20,333,029 KM2 as at 16-Apr-2021

- Extent gain on this day 89k, 1 k more than the average gain on this day (of the last 10 years) of 88k,
- Extent gain from minimum on this date is 3.81 million km2, 0.29 million km2, 8.4% more than the 10 year average gain of 3.51 million km2.
- Extent is at position #10 in the satellite record of which 1 years were in the last century

- 2021 Extent is 0.08 million km2 MORE than 2010's Average
- 2020 Extent is 0.85 million km2 MORE than 2020

On average 39.5% of sea ice gain from minimum to maximum done, and 202 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.71 million km2, 1.95 million km2 above the 2016 record low maximum of 23.76 million km2.
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gerontocrat · « **Reply #1083 on:** **Today** at 12:33:21 PM »

JAXA GLOBAL SEA ICE EXTENT: 20,444,264 KM2 as at 17-Apr-2021

- Extent gain on this day 111k, 33 k more than the average gain on this day (of the last 10 years) of 78k,
- Extent gain from minimum on this date is 3.92 million km2, 0.33 million km2, 9.1% more than the 10 year average gain of 3.59 million km2.
- Extent is at position #12 in the satellite record of which 1 years were in the last century

- 2021 Extent is 0.10 million km2 MORE than 2010's Average
- 2020 Extent is 0.97 million km2 MORE than 2020

On average 40.4% of sea ice gain from minimum to maximum done, and 201 days to maximum

Projections of the Unknown Quantity. (Table JAXA-AA1)

Average remaining sea ice gain (of the last 10 years) would produce a maximum in November 2020 of 25.75 million km2, 1.98 million km2 above the 2016 record low maximum of 23.76 million km2.
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Author Topic: Global sea ice area and extent data (Read 224340 times)