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Messages - Wipneus

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2
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.

3
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.

4
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.

5
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.

6
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

7
Updated Fram volume export graph.

8
Updated volume and volume-anomaly graphs. Click to size.

9
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.

10
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.

12
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.

13
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.

14
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.

15
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.

17
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.

18
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.

19
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.

20
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.

21
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.

22
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

23
The updated Fram volume export graph, shows average export levels not abnormal for April.

24
The updated volume and volume-anomaly graphs (which get bigger when clicked upon).

25
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.

27
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).

28
Arctic sea ice / Re: Latest PIOMAS update (April 2020)
« on: April 04, 2020, 04:47:44 PM »
Updated Fram volume export graph.

29
Arctic sea ice / Re: Latest PIOMAS update (April 2020)
« on: April 04, 2020, 04:45:12 PM »
The updated volume and volume-anomaly graphs.

30
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.

31
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

32
Updated Fram volume graph.

33
Updated volume and volume-anomaly graphs.

34
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.

36
Arctic sea ice / Re: Latest PIOMAS update (March 2020)
« on: March 04, 2020, 07:06:43 PM »
Thickness map, compared with previous years and their diffs.
That is on the 29th of Feb, admittingly looks a bit silly for the other years.

Images to click for size.

37
Arctic sea ice / Re: Latest PIOMAS update (March 2020)
« on: March 04, 2020, 06:58:37 PM »
Fram volume export was above average this month.

38
Arctic sea ice / Re: Latest PIOMAS update (March 2020)
« on: March 04, 2020, 06:41:40 PM »
Volume and volume-anomaly graphs. Click for larger and clearer images.

39
Arctic sea ice / Re: Latest PIOMAS update (March 2020)
« on: March 04, 2020, 06:29:58 PM »
PIOMAS has updated. Last date was actually day 60 of 2020. Now that would be entirely consistent with 29th of February, except that the PIOMAS year has only 365 days every year. So it could be tagged as 1st March in PIOMAS time scale. For now, I stick to 29th of February. That may change silently later this year.

Anyway here is the animation.

40

Wipneus - thanks for all the efforts - how about a double thickness line for the current year - or a dashed version?

Good suggestion, I will go for the thicker current year (like in some area/extent graphs).


Quote
Equally maybe the ones say before 2010 could be finer / dotted lines so that even if they are  roughly same colour its easy to spot that they in a different category?

Yes, like all suggestions to use different line styles (like dotted or dashed) it takes some experimenting and may not be usable in all my graphs. Eventually as the number of years in the graphs grow it will be necessary at some time.

41
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

Sorry to say Wipneus but the .txt file is dated 4/2/2020 with data to 31 Jan.

My apologies! It should be corrected now.

42
Arctic sea ice / Re: Latest PIOMAS update (February 2020)
« on: February 19, 2020, 10:14:10 AM »

Hi Wipneus, you asked the same question a year ago and I replied then with a suggested colour palette.

Did you try those colours and, if so, did they work OK?

[sorry for the late reply]

Hi slow wing.

Yes I have been using that approach: create an ordered set of colors nicely spaced out in RGB space. Unfortunately nice spaced in RGB is not perceived as such by our eyes. So I start tweaking colors, not to my complete satisfaction. 

43
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

44
The gridded velocity data was not updated (yet?), so Fram export graph cannot be updated.

Here are the volume and volume and volume-anomaly graphs. Colors have been a bit tweaked, a light grey background added to make the yellows a bit readable, and shared with existing area/extent graphs.

[edit: gave 2020 a thicker line as suggested by charles_oil]
 

45
PIOMAS has updated the gridded thickness data upto the 15th. Calculated volume at 2020-2-15 was 19.67 [1000km3], This is fifth lowest for the day, exactly the same as the volume on that day in 2016, the "final official" volume data may change that exact match.

Here is the animation for February so far.

47
Arctic sea ice / Re: Latest PIOMAS update (February 2020)
« on: February 04, 2020, 08:19:07 PM »
Here are volume and volume-anomaly graphs.

It is getting harder to find a new color for a new year. I am trying a new color scheme that I found here:
https://sashat.me/2017/01/11/list-of-20-simple-distinct-colors/

Have a look, I am not sure myself yet, comments are welcome.


48
Arctic sea ice / Re: Latest PIOMAS update (February 2020)
« on: February 04, 2020, 07:21:45 PM »
Thickness map on 2020-01-31, compared with recent years and the diff's. Click for full size.

49
Arctic sea ice / Re: Latest PIOMAS update (February 2020)
« on: February 04, 2020, 07:11:15 PM »
PIOMAS has updated. Volume on 31st January was 18.282[1000km3], this is fifth lowest behind 2011,2013,2017 and 2018.

Here is the animation.

50
Arctic sea ice / Re: Latest PIOMAS update (January 2020)
« on: January 04, 2020, 10:09:31 AM »
Thickness map on 31st December 2019, compared with recent years and their diffs.
Clicks are needed for full size.

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