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Messages - Wipneus

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1
Arctic sea ice / Re: Latest PIOMAS update (Oktober, mid-monthly update)
« on: October 18, 2020, 07:14:14 PM »
Some people have good use for the updated regional data files.

daily:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional.txt.gz

2
Arctic sea ice / Re: Latest PIOMAS update (Oktober, mid-monthly update)
« on: October 18, 2020, 07:11:44 PM »
The Fram volume export graph. Looks are a bit different this time  after upgrading the plotting software (matplotlib), probably needs a bit of tweaking.

3
Arctic sea ice / Re: Latest PIOMAS update (Oktober, mid-monthly update)
« on: October 18, 2020, 07:02:21 PM »
Here are the volume and volume-anomaly graphs.

4
Arctic sea ice / Re: Latest PIOMAS update (Oktober, mid-monthly update)
« on: October 18, 2020, 06:59:10 PM »
PIOMAS has updated the gridded thickness data upto day 289 (15th or 16th of Oktober). Volume calculated from thickness on that day was 4.91 [1000 km3]. That is the second lowest value for day 289. The difference with the lowest (2012) is very small though.

Here is the animation for Oktober 2020 sofar.

5
Arctic sea ice / Re: Latest PIOMAS update (Oktober)
« on: October 05, 2020, 12:49:56 PM »
Normally I would present the graphs based on the annual minimum now, including extrapolations of the exponential declining sea ice mass.

But as discussed in last years presentation:
https://forum.arctic-sea-ice.net/index.php/topic,119.msg232081.html#msg232081

there seems little point in doing so. With a new year added, all but the most basic linear fit have shifted the time of "zero" ice one year in the future.

The exception is the linear fit and extrapolation over the full PIOMAS dataset (1979+). Here the extrapolated year of zero ice is 2032, same as "predicted" last year and not different from previous years.

I will attach this years graph with the same one made in 2015. Extrapolated zero is 2032, with a slightly "improved" confidence interval (upper limit no later than 2039).

 

6
Arctic sea ice / Re: Latest PIOMAS update (Oktober)
« on: October 05, 2020, 12:15:46 PM »
Thickness map, compared with previous years and their differences around the annual minimum.

8
Arctic sea ice / Re: Latest PIOMAS update (Oktober)
« on: October 05, 2020, 11:46:44 AM »
The updated fram volume export shows "normal" September export.

9
Arctic sea ice / Re: Latest PIOMAS update (Oktober)
« on: October 05, 2020, 11:43:04 AM »
The updated volume and volume anomaly graphs.

10
Arctic sea ice / Re: Latest PIOMAS update (Oktober)
« on: October 05, 2020, 11:24:01 AM »
PIOMAS has upgraded the gridded thickness data upto day 274 (30th Sep/1st Okt as you like). Calculated volume on that day wa 4.3 [1000lm3], which is the second lowest value for day 274.

Minimum volume was reached on day 261: 4.03 [1000lm3], second lowest.

Here is the September animation.

11
Arctic sea ice / Re: Latest PIOMAS update (September, mid-monthly update)
« on: September 18, 2020, 06:46:23 PM »
Some people have good use for the updated regional data files.

daily:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional.txt.gz

12
Arctic sea ice / Re: Latest PIOMAS update (September, mid-monthly update)
« on: September 18, 2020, 06:45:22 PM »
The update Fram volume export graph.

13
Arctic sea ice / Re: Latest PIOMAS update (September, mid-monthly update)
« on: September 18, 2020, 06:37:34 PM »
Updated volume and volume-anomaly graphs.

14
Arctic sea ice / Re: Latest PIOMAS update (September, mid-monthly update)
« on: September 18, 2020, 06:34:57 PM »
PIOMAS has updated the gridded thickness data up to day 259 (15/16th September). Calculated volume on day 259 was 4.06 [1000 km3], which is second lowest for the day. It is also the preliminary minimum for 2020 but that may change of course.

Here is the animation for September so far.

16
Arctic sea ice / Re: Latest PIOMAS update (September 2020)
« on: September 03, 2020, 06:47:42 PM »
Latest thickness map compared with recent years and their differences.

17
Arctic sea ice / Re: Latest PIOMAS update (September 2020)
« on: September 03, 2020, 06:42:48 PM »
Fram volume export graph.

18
Arctic sea ice / Re: Latest PIOMAS update (September 2020)
« on: September 03, 2020, 06:41:47 PM »
Volume and volume-anomaly graphs.

19
Arctic sea ice / Re: Latest PIOMAS update (September 2020)
« on: September 03, 2020, 06:39:21 PM »
PIOMAS has updated the gridded thickness data to day 244 (31 August or first of September). Volume calculated from thickness was 4.31 [1000 km3] which is third lowest for that day (behind 2012 and 2019).

Here is the August animation.

20
Wipneus, what are the numbers for 2012 and 2019?


4.75  4.88  5.14  5,31 (2012, 2019, 2020, 2017)

21
Some people have good use for the updated regional data files.

daily:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional.txt.gz

22
Updated Fram volume export graph.

23
Updated volume and volume-anomaly graphs.

24
PIOMAS gridded thickness data was updated to day 228 (15/16 August). Calculated volume on that day is 5.14 [1000km3], which means a third lowest place before 2012 and 2019.

Here is the animation for August thus far.

25
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: August 07, 2020, 09:02:23 AM »
Uni Hamburg AMSR2 2012 sea ice concentration is only available from first of August. Here is an animation of the first six days  with 2020 and 2012 side by side.

26
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: August 04, 2020, 10:26:04 AM »
Some people have use for the updated regional data files:

monthly:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional-monthly.txt.gz
daily:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional.txt.gz

In case anyone wonders, there is no daily gice update yet.

27
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: August 04, 2020, 10:23:39 AM »
Thickness map compared with previous year and their differences.

28
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: August 04, 2020, 10:08:20 AM »
Fram volume export graph.

29
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: August 04, 2020, 10:05:52 AM »
The volume and volume-anomaly graphs.

30
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: August 04, 2020, 09:56:26 AM »
PIOMAS gridded thickness data is updated to day 213 (31Jul/1Aug). The (calculated) volume on that day was 6.52 [1000km3], second lowest (behind 2019).

Here is the animation.

31
You can of course also plot ice volume per category.

32
Thanks to DR. Zhang we have updated gice files as well. Gice gives information about the thickness variations in each of the cells in the PIOMAS grid. I have tried to explain the details  of gice here: 
https://forum.arctic-sea-ice.net/index.php/topic,119.msg152005.html#msg152005

From gice I can calculate the area occupied from ice with thickness in each of the 12 thickness categories.
The attached graph shows this for each of the years in the PIOMAS data set. The area of all categories with thickness larger than zero is the PIOMAS area figure. PIOMAS area near the minimum, I take 10th of September, is plotted as a dashed line.

The naive explanation is that before 2007 about 26 cm of ice would be melted by the end of the melting season. The final area more or less follows the >26cm category. After 2007 that figure is about 71cm, after 2007 final area follows the >71cm cat, with variations less than half a million km2.

Ice of 71 cm and higher has the lowest area on day 197 of all years. To beat 2012 September area it has to go quite a bit lower than that, as 2020 managed to melt quite some ice in the >71cm category.

33
Arctic sea ice / Re: Latest PIOMAS update (July 2019)
« on: July 21, 2020, 08:13:40 AM »
Hi Wipneus, could you please provide an update of the gice charts? (Area and volume by thickness categories).

The gice data has not been updated since mid 2019.

Quote
It would be very interesting this year.

Agreed, I will ask Dr. Zhang.

34
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 20, 2020, 08:17:56 PM »
Compare that with 2012 which maintains the area in melting mch more.

35
Arctic sea ice / Re: Home brew AMSR2 extent & area calculation
« on: July 20, 2020, 08:15:26 PM »
I see that Wipneus has updated the graphs in the meantime (thanks, Wipneus).

Just fixed those Stephen. The slowdown in melting area is indeed strong, perhaps I can illustrate it with an animation.

36
The Fram volume export graph shows more export than the July "normal".

37
Some people have good use for the updated regional data files.

daily:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional.txt.gz

38
Thanks Wipneus!🙂

Only a fourth place?! :o How far away are we from first place for the date?

PIOMAS uses sea ice area for input. NSIDC sea ice area is third/fourth lowest for the day, in contrast with extent. That still may change.

39
Sorry for the delay, some trouble with the download caused a corrupted file (uice, the ice velocity data).

Here are the updated volume and volume-anomaly graphs. Worth a click for size.

40
PIOMAS has upgraded the gridded thickness data to day 197 (15 /16 July). Volume on day 197 was 9.04 [1000km3], which means an annual fourth lowest place for that day.

Fasten seat belts, here is the animation of July so far. Might need a click.

42
Arctic sea ice / Re: Latest PIOMAS update (July 2020)
« on: July 04, 2020, 11:24:43 AM »
The thickness map for day 182, compared with previous years and their difference. All need a click for size.

43
Arctic sea ice / Re: Latest PIOMAS update (July 2020)
« on: July 04, 2020, 11:17:02 AM »
Fram volume export. The monthly "normal" line has been blown up, hoping it makes it a bit easier to spot.

44
Arctic sea ice / Re: Latest PIOMAS update (July 2020)
« on: July 04, 2020, 10:41:55 AM »
Volume and volume-anomaly graphs. Click for size.

45
Arctic sea ice / Re: Latest PIOMAS update (July 2020)
« on: July 04, 2020, 10:29:26 AM »
PIOMAS has updated the gridded thickness data. Last day (day 182, 30th June or 1st July) the calculated volume was 12.53 [1000km3], which is the fourth lowest for day 182.

Here is the animated thickness map, which seems to start only after a click.

46
Some people have good use for the updated regional data files.

daily:
https://sites.google.com/site/arctischepinguin/home/piomas/data/PIOMAS-regional.txt.gz

47
Updated Fram volume export graph.

48
Updated volume and volume-anomaly graphs. Click to size.

49
PIOMAS gridded thickness data was updated to day 167 (15/16th  of June). Calculated volume on that day was 16.734 [1000 km3], 6th lowest for the day.

Here is the animation of this year's "june cliff" in progress.

50
Arctic sea ice / Re: Latest PIOMAS update (June 2020)
« on: June 03, 2020, 11:10:57 AM »
Thickness map for day 152, compared with previous yeas and their diff's. Click for size.

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