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Messages - Wipneus

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1
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: Today at 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.

2
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: Today at 10:23:39 AM »
Thickness map compared with previous year and their differences.

3
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: Today at 10:08:20 AM »
Fram volume export graph.

4
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: Today at 10:05:52 AM »
The volume and volume-anomaly graphs.

5
Arctic sea ice / Re: Latest PIOMAS update (August 2020)
« on: Today at 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.

6
You can of course also plot ice volume per category.

7
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.

8
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.

9
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.

10
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.

11
The Fram volume export graph shows more export than the July "normal".

12
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

13
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.

14
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.

15
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.

17
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.

18
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.

19
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.

20
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.

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. Click to size.

24
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.

25
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.

27
Arctic sea ice / Re: Latest PIOMAS update (June 2020)
« on: June 03, 2020, 11:03:12 AM »
A large amount of ice crossed the imaginary line in the Fram Straight in the beginning of May.

28
Arctic sea ice / Re: Latest PIOMAS update (June 2020)
« on: June 03, 2020, 10:47:47 AM »
The volume and volume-anomaly graphs. Click to size.

29
Arctic sea ice / Re: Latest PIOMAS update (June 2020)
« on: June 03, 2020, 10:28:16 AM »
PIOMAS gridded thickness data has updated to day 152 (~1 June). Calculated volume was 19.6 [1000 km3], 6th lowest on that day of year.

Here is the May animation.

30
Arctic sea ice / Re: Latest PIOMAS update (May 2020)
« on: May 27, 2020, 12:09:54 PM »
Was there an update for mid-May?

No, and by this time not likely will there be one.

32
Arctic sea ice / Re: Latest PIOMAS update (May 2020)
« on: May 05, 2020, 10:58:00 AM »
Thickness map, compared with previous years and their diff's. All need a click for better view.

33
Arctic sea ice / Re: Latest PIOMAS update (May 2020)
« on: May 05, 2020, 10:08:02 AM »
The Fram volume export got into trouble the second half of the month.

34
Arctic sea ice / Re: Latest PIOMAS update (May 2020)
« on: May 05, 2020, 10:05:33 AM »
The volume and volume-anomaly graphs. Needs clicks for size and clarity.

35
Arctic sea ice / Re: Latest PIOMAS update (May 2020)
« on: May 05, 2020, 10:03:30 AM »
PIOMAS has updated once again. Last date corresponds to day 121 of this year, which in the PIOMAS data is the first of May (ignoring the leap year). Volume (calculated from thickness) was 22.52 [1000km3], the sixth lowest for day 121.
The maximum seems to have been reached on day 105 (15th April) with a volume of 22.96 [1000km3].

Here is the monthly animation.

36
Wipneus,

Further to our previous conversations re NRT CS2 thickness, do you by any chance possess "regional masks" for the standard OSI-SAF EASE grid?

I am afraid not, neither do I see an real easy solution to get one.

The PIOMAS regional masks where developed by Chris Reynolds from the Cryosphere Today originals. That would have to be repeated but now with an EASE grid.

37
And of course I updated the regional volume data, for those that have a good use for it.

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

38
The updated Fram volume export graph, shows average export levels not abnormal for April.

39
The updated volume and volume-anomaly graphs (which get bigger when clicked upon).

40
PIOMAS has updated the gridded thickness data up-to day 106 (15 or 16 April, see previous announcements for the explanation). On that day volume was 22.94 [1000 km3], 6th lowest for the day.

Here is the animation for the first half of April.

42
Arctic sea ice / Re: Latest PIOMAS update (April 2020)
« on: April 04, 2020, 05:01:18 PM »
Thickness map, compared with previous years and their differences on day 91 (here labeled 31st of March).

43
Arctic sea ice / Re: Latest PIOMAS update (April 2020)
« on: April 04, 2020, 04:47:44 PM »
Updated Fram volume export graph.

44
Arctic sea ice / Re: Latest PIOMAS update (April 2020)
« on: April 04, 2020, 04:45:12 PM »
The updated volume and volume-anomaly graphs.

45
Arctic sea ice / Re: Latest PIOMAS update (April 2020)
« on: April 04, 2020, 04:14:03 PM »
PIOMAS gridded thickness data was updated. Last day was day 91, about 31st of March, the volume calculated from this thickness was 22.73 [km3. Compared with other years on day 91 (most often the first of April) 2020 is the 7th lowest.

Here is the March animation. Ice is thickening impressively against the Canadian Archipelago and North Greenland.

46
Some people have use for the updated regional data files:

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

47
Updated Fram volume graph.

48
Updated volume and volume-anomaly graphs.

49
PIOMAS has updated gridded thickness data to day 75, which would normally be the 15th of March. Because a PIOMAS has no leap years, it ends in some graphs at the 16th.
Any way volume calculated from this thickness was 22.10 [km3], 8th lowest for day 75.
Here is the animation of March sofar.

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