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Author Topic: Global sea ice area and extent data  (Read 159899 times)

gerontocrat

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Re: Global sea ice area and extent data
« Reply #750 on: March 24, 2020, 11:23:39 AM »
JAXA GLOBAL SEA ICE EXTENT :    18,486,057 km2 as at 23 March 2020

Since the last posting, Arctic Sea Ice loss has been somewhat below average & Antarctic sea ice gain also below average. As a result Global sea ice gain since the minimum is now more below average.

- On this day extent is 9th 7th lowest in the satellite record since 1979,
- Extent gain to date 1.77 million km2, 0.23 million km2 (11.7%) less than the last 10 years' average gain of 2.00 million km2,
- Extent is 1.94 million km2 greater than 2017,
- Extent is 0.58 million km2 greater than 2018,
- Extent is 1.08 million km2 greater than 2019,
- Extent is 0.03 million km2 MORE less than the 2010's average,

- 28% of the average ice GAIN of the season done, 226 days to the average maximum date of 4 November.

The Perils of Projections

Average sea ice extent gain would produce a maximum of 25.60 million km2, 1.83 million km2 above the record low maximum of 23.76 million km2 in 2016.
"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: Global sea ice area and extent data
« Reply #751 on: March 29, 2020, 03:57:21 PM »
JAXA GLOBAL SEA ICE EXTENT :   18,499,564 km2 as at 28 March 2020

Since the last posting, Arctic Sea Ice loss has continued somewhat below average & Antarctic sea ice gain also below average. As a result Global sea ice gain since the minimum is now more below average.

- On this day extent is 7th lowest in the satellite record since 1979,
- Extent gain to date 1.78 million km2, 0.66 million km2 (27 %) less than the last 10 years' average gain of 2.44 million km2,
- Extent is 1.52 million km2 greater than 2017,
- Extent is 0.17 million km2 greater than 2018,
- Extent is 0.92 million km2 greater than 2019,
- Extent is 0.42 million km2 less than the 2010's average,

- 36% of the average ice GAIN of the season done, 221 days to the average maximum date of 4 November.

The Perils of Projections

Average sea ice extent gain would produce a maximum of 25.21 million km2, 1.44 million km2 above the record low maximum of 23.76 million km2 in 2016.
"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: Global sea ice area and extent data
« Reply #752 on: April 05, 2020, 01:10:16 PM »
JAXA GLOBAL SEA ICE EXTENT :  18,993,484 km2 as at 28 March 2020

Since the last posting, Arctic Sea Ice loss has continued close to average & Antarctic sea ice gain a bit above average. As a result Global sea ice gain this week below average.

- On this day extent is 7th lowest in the satellite record since 1979,
- Extent gain to date 2.27 million km2, 0.59 million km2 (21 %) less than the last 10 years' average gain of 2.86 million km2,
- Extent is 1.34 million km2 greater than 2017,
- Extent is 0.54 million km2 greater than 2018,
- Extent is 1.40 million km2 greater than 2019,
- Extent is 0.35 million km2 less than the 2010's average,

- 46% of the average ice GAIN of the season done, 214 days to the average maximum date of 4 November.

The Perils of Projections

Average sea ice extent gain would produce a maximum of 25.28 million km2, 1.52 million km2 above the record low maximum of 23.76 million km2 in 2016.
"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: Global sea ice area and extent data
« Reply #753 on: April 05, 2020, 01:13:49 PM »
JAXA GLOBAL SEA ICE EXTENT : Monthly Average Sea Ic Extent graphs.

Just because I like them, here are the monthly graphs for Jan, Feb, March.

Note the increase in deviations over the years - mostly down to the Antarctic.
"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)

Stephan

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Re: Global sea ice area and extent data
« Reply #754 on: April 05, 2020, 09:55:12 PM »
I compared the actual JAXA sea ice extent of April 4 with the averages of the past decades.
In the Arctic the same value was achieved on average in the
2010s: 14.4. (+ 10 d later)
2000s: 23.4. (+ 19 d later)
1990s:   1.5. (+ 27 d later)
1980s: 10.5. (+ 36 d later)
In the Antarctic the same value was achieved on average in the
2010s:   4.4. (±  0 d)
2000s:   1.4. (+  3 d earlier)
1990s:   1.4. (+  3 d earlier)
1980s:   6.4. (-  2 d later)
Summarized this means more insulation respectively more freezing heat to be released in comparison to the earlier decades:
2010s:   + 10 days
2000s:   + 22 days
1990s:   + 30 days
1980s:   + 34 days,
where the changes are large in the Arctic and probably negligible in the seas around Antarcitca
It is too late just to be concerned about Climate Change

Glen Koehler

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Re: Global sea ice area and extent data
« Reply #755 on: April 06, 2020, 12:00:09 AM »
  1) Took me a few seconds to understand the date format Day.Month, thus 1.5 = May 1.

   2) Not related to above post, but how does Antarctic sea ice volume compare to Arctic?  I suspect the average thickness in Antarctic is less than Arctic because most of the Antarctic ice melts each summer, thus no MYI.  Thus, the difference between Antarctic and Arctic in volume would be less than difference in their Extents.

  3) It just occurred to me that the name Antarctic is northern hegemonistic bias!  Why is an entire continent and the biggest reservoir of fresh water and ice on the planet named only in relation to, and as the opposite of, another region?  It should have its own name.  Antarctic liberation!

   
« Last Edit: April 06, 2020, 02:28:52 AM by Glen Koehler »

philopek

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Re: Global sea ice area and extent data
« Reply #756 on: April 06, 2020, 01:07:00 AM »
  1) Took me a few seconds to understand the date format Day.Month, thus 1.5 = May 1.  Just passing this along in case do not have Jiant brain like me.

   2) How does Antarctic sea ice volume compare to Arctic?  I suspect the average thickness in Antarctic is less than Arctic because most of the Antarctic ice melts each summer, thus no MYI.  Thus, the difference between Antarctic and Arctic in volume would be less than difference in their Extents.

  3) It just occurred to me that the name Antarctic is northern hegemonistic bias!  Why is an entire continent and the biggest reservoir of fresh water and ice on the planet named only in relation to, and as the opposite of, another region?  It should have its own name.  Antarctic liberation!

Are you on a mission ?

I liked the contribution and it's very easy to comprehend IMO, thanks Stephan.

Negative Nitpicking is a very persistent virus indeed.

Glen Koehler

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Re: Global sea ice area and extent data
« Reply #757 on: April 06, 2020, 02:16:14 AM »
I liked it too.

Stephen

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Re: Global sea ice area and extent data
« Reply #758 on: April 06, 2020, 02:29:03 AM »

  3) It just occurred to me that the name Antarctic is northern hegemonistic bias!  Why is an entire continent and the biggest reservoir of fresh water and ice on the planet named only in relation to, and as the opposite of, another region?  It should have its own name.  Antarctic liberation!


Arktos is the ancient Greek name for bear.  So the Arctic region was named after the polar bear.

There are no bears on the southernmost continent.  Penguins, being small cute and harmless, are pretty much the exact opposite of polar bears, so Antarctic seems reasonable to me.
The ice was here, the ice was there,   
The ice was all around:
It crack'd and growl'd, and roar'd and howl'd,   
Like noises in a swound!
  Rime of the Ancient Mariner by Samuel Taylor Coleridge

Glen Koehler

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Re: Global sea ice area and extent data
« Reply #759 on: April 06, 2020, 03:33:11 AM »
Penguinia!

Ranman99

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Re: Global sea ice area and extent data
« Reply #760 on: April 06, 2020, 05:17:11 AM »
Sphenisciformes Land ;-)
Randy Fitton

binntho

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Re: Global sea ice area and extent data
« Reply #761 on: April 06, 2020, 06:27:34 AM »
Arktos is the ancient Greek name for bear.  So the Arctic region was named after the polar bear.

The greeks who coined the word had probably never heard of the polar bear. They were familiar with bears in their own mountains and had named the constellation the Great Bear after that animal.

So "arktikos" is probably, according to current thinking, referring to the great northern constellation Great Bear, and by extensions, all northern regions.

"Arktos" on the other hand seems to refer to authority, sharing a stem with "arxo" meaning "command" or "primary", as in "archaic", "archbishop" and "archangel.
because a thing is eloquently expressed it should not be taken to be as necessarily true
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Pmt111500

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Re: Global sea ice area and extent data
« Reply #762 on: April 06, 2020, 06:47:24 AM »
We need a Penguin constellation  over the southern sky!
« Last Edit: April 06, 2020, 08:43:38 AM by Pmt111500 »
Cooling the outside by heat pump.

binntho

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Re: Global sea ice area and extent data
« Reply #763 on: April 06, 2020, 08:47:38 AM »
Good one!

If we keep to the Greek naming tradition, then apparently all penguins belong to the sphenisciformae which is a typical greek - latin construct, with spheniscos being Greek for wedge.

So penguins are named "wedgeformed", probably based on the shape of their wings.

And the constellation could be called Spheniscos Minor and the continent Sphenisctica rather than now clearly obsolete Antarctica.
because a thing is eloquently expressed it should not be taken to be as necessarily true
St. Augustine, Confessions V, 6

Rodius

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Re: Global sea ice area and extent data
« Reply #764 on: April 07, 2020, 08:43:47 AM »
What the hell just happened in the most serious thread on the forum????? lol

gerontocrat

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Re: Global sea ice area and extent data
« Reply #765 on: April 08, 2020, 10:14:47 AM »
JAXA GLOBAL SEA ICE EXTENT :  18,993,484 km2 as at 7 April 2020


- On this day extent is 7th lowest in the satellite record since 1979,
- Extent gain to date 2.40 million km2, 0.66 million km2 (22 %) less than the last 10 years' average gain of 3.06 million km2,
- Extent is 1.32 million km2 greater than 2017,
- Extent is 0.48 million km2 greater than 2018,
- Extent is 1.30 million km2 greater than 2019,
- Extent is 0.43 million km2 less than the 2010's average,

- 50% of the average ice GAIN of the season done, 211 days to the average maximum date of 4 November.

The Perils of Projections

Average sea ice extent gain would produce a maximum of 25.20 million km2, 1.44 million km2 above the record low maximum of 23.76 million km2 in 2016.
"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)