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Author Topic: Latest PIOMAS update (April 2020)  (Read 1135276 times)

Wipneus

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Re: Latest PIOMAS update (February 2020, mid-monthly update)
« Reply #3200 on: February 19, 2020, 02:25:56 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

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.

Wipneus

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Re: Latest PIOMAS update (February 2020, mid-monthly update)
« Reply #3201 on: February 19, 2020, 02:32:05 PM »

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.

gerontocrat

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Re: Latest PIOMAS update (February 2020, mid-monthly update)
« Reply #3202 on: February 19, 2020, 05:24:55 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
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.
Thanks
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gerontocrat

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Re: Latest PIOMAS update (mid Feb 2020)
« Reply #3203 on: February 19, 2020, 07:20:01 PM »
This person always does "have use for the updated regional data files" from Wipneus:

PIOMAS Volume as at 15 February 2020  19,669 km3

The standard graphs and tables as I use for the JAXA extent data are attached.

Volume gain in 1st week of Feb well above average, 2nd week well below.

2019 volume stays at 5th lowest in the satellite record,
- 2,289 km3 above 2017,
-  1,022 km3 above 2018,
-      18 km3 above the 2010's average,
and less than 2019 by a reduced 255 km3.

Not really a surprise that volume gain in Feb to date was so mixed, given the similar story for both area and extent.
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gerontocrat

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Re: Latest PIOMAS update (February 2020, mid-monthly update)
« Reply #3204 on: February 19, 2020, 07:39:25 PM »
PIOMAS Volume & Thickness as at 15 February 2020

I attach graphs of volume & thickness for
- total arctic seas,
- the High Arctic Seas -i.e. the 7 seas of the main Arctic Ocean (excludes Barents & Greenland)

You can see average thickness will continue to climb even when volume has maxed - area declining on the fringes that have mainly thin ice.
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Wipneus

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Re: Latest PIOMAS update (March 2020)
« Reply #3205 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.

Wipneus

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Re: Latest PIOMAS update (March 2020)
« Reply #3206 on: March 04, 2020, 06:41:40 PM »
Volume and volume-anomaly graphs. Click for larger and clearer images.

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Re: Latest PIOMAS update (March 2020)
« Reply #3207 on: March 04, 2020, 06:58:37 PM »
Fram volume export was above average this month.

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Re: Latest PIOMAS update (March 2020)
« Reply #3208 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.

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gerontocrat

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Re: Latest PIOMAS update (mid Feb 2020)
« Reply #3210 on: March 08, 2020, 01:45:31 PM »
PIOMAS Volume as at 28 February 2020   20.787  km3

Note:
PIOMAS has a 365 day year that in Leap Year finishes on 30 December.
I have a 365 day year that turns 29th Feb into 1 March
Makes a small difference.
Ho hum.


The standard graphs and tables as I use for the JAXA extent data are attached.

Daily Volume gain in Feb more above average than below.

2019 volume at 6th lowest in the satellite record,
- 2,187 km3 above 2017,
-  1,153 km3 above 2018,
-      84 km3 above the 2010's average,
and less than 2019 to a much reduced 98 km3.
"Para a Causa do Povo a Luta Continua!"
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Wipneus

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Re: Latest PIOMAS update (March 2020, mid-monthly update)
« Reply #3211 on: March 19, 2020, 04:03:29 PM »
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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Re: Latest PIOMAS update (March 2020, mid-monthly update)
« Reply #3212 on: March 19, 2020, 04:04:57 PM »
Updated volume and volume-anomaly graphs.

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Re: Latest PIOMAS update (March 2020, mid-monthly update)
« Reply #3213 on: March 19, 2020, 04:06:04 PM »
Updated Fram volume graph.

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Re: Latest PIOMAS update (March 2020, mid-monthly update)
« Reply #3214 on: March 19, 2020, 04:08:20 PM »
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

gerontocrat

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Re: Latest PIOMAS update (March 2020, mid-monthly update)
« Reply #3215 on: March 19, 2020, 05:57:02 PM »
Updated Fram volume graph.
.....showing its effect on Greenland Sea Area.

Fram export is the dominant influence in any one year ... But the 10 year averages show that in the long-term the only direction of travel of sea ice area is...DOWN.
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Re: Latest PIOMAS update (mid Feb 2020)
« Reply #3216 on: March 20, 2020, 12:46:35 PM »
PIOMAS Volume as at 15 March 2020   22,099  km3

Note:
PIOMAS has a 365 day year that in Leap Year finishes on 30 December.
I have a 365 day year that turns 29th Feb into 1 March
Makes a small difference - you may see a gremlin or two with dates on the graphs.
Ho hum.


The standard graphs and tables as I use for the JAXA extent data are attached.

Daily Volume gain in March to date equally below as above average.

2019 volume at 15 March 7th lowest in the satellite record,
- 2,415 km3 above 2017,
-  1,059 km3 above 2018,
-     293 km3 above the 2010's average,
and more than 2019 by 90 km3.

The daily change and plume graphs shows how volume gain in 2019 was so exceptionally low in recent days and from now to maximum.
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
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Wipneus

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Re: Latest PIOMAS update (April 2020)
« Reply #3217 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.

Wipneus

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Re: Latest PIOMAS update (April 2020)
« Reply #3218 on: April 04, 2020, 04:45:12 PM »
The updated volume and volume-anomaly graphs.

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Re: Latest PIOMAS update (April 2020)
« Reply #3219 on: April 04, 2020, 04:47:44 PM »
Updated Fram volume export graph.

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Re: Latest PIOMAS update (April 2020)
« Reply #3220 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).

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Re: Latest PIOMAS update (April 2020)
« Reply #3222 on: April 04, 2020, 05:18:06 PM »
Thanks so much, Wipneus!
Everyone who can must self-isolate.

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Re: Latest PIOMAS update (April 2020)
« Reply #3223 on: April 04, 2020, 06:16:03 PM »
2020 extra volume is in the Barents Kara Fram and the adjacent CAB sector, not a very secure location. Continued strong export and early Atlantic-side heat could cause this advantage to be lost in the late spring. Another extra volume region is the Beaufort, hopefully this will serve as a good defense against an early meltout there.

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Re: Latest PIOMAS update (mid Feb 2020)
« Reply #3224 on: April 06, 2020, 01:49:26 PM »
PIOMAS Volume as at 31 March 2020   22,693  km3

Note:
PIOMAS has a 365 day year that in Leap Year finishes on 30 December.
I have a 365 day year that turns 29th Feb into 1 March, and finishes on 31 December.
I will be one day out of sync with te PIOMAS data to the end of the year.
Ho hum.


The standard graphs and tables as I use for the JAXA extent data are attached.

Daily Volume gain in March to date equally below as above average.

2019 volume at 31 March was 6 th lowest in the satellite record,
- 2,309 km3 above 2017,
-    781 km3 above 2018,
-    148 km3 above the 2010's average,
and more than 2019 by 473 km3.

The daily change and plume graphs shows how volume gain in 2019 was so exceptionally low in recent days and from now to maximum.
"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: Latest PIOMAS update (April 2020)
« Reply #3225 on: April 06, 2020, 02:13:46 PM »
I am starting to separate the 7 High Arctic Seas from the 7 Peripheral Seas. At the moment just a little fishing expedition.

Here is a first little look at volume. Note that the monthly averages data goes back to 1979, which is a help for later comparisons with NSIDC Area & extent data.
"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)