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Author Topic: Near Real Time Sea Ice Volume  (Read 4267 times)

Random_Weather

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Re: Near Real Time Sea Ice Volume
« Reply #50 on: January 19, 2020, 09:29:12 PM »
And here why i use r-script, today written:





Random_Weather

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Re: Near Real Time Sea Ice Volume
« Reply #51 on: January 21, 2020, 06:10:50 PM »
Update on Volume


Random_Weather

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Re: Near Real Time Sea Ice Volume
« Reply #52 on: January 29, 2020, 06:23:33 AM »
Update + change from Exel to "R" + change from NSIDC to AMSR2



now include the most recent volume of the "lines"

Tom_Mazanec

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Re: Near Real Time Sea Ice Volume
« Reply #53 on: January 29, 2020, 09:15:13 AM »
We are distinctly below the average for the decade.
Are we record low?
SHARKS (CROSSED OUT) MONGEESE (SIC) WITH FRICKIN LASER BEAMS ATTACHED TO THEIR HEADS

Random_Weather

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Re: Near Real Time Sea Ice Volume
« Reply #54 on: January 29, 2020, 09:21:34 AM »
Since i account for instrumental uncertainy, its not for sure, but when you look at the "Min", its lower in 2019/2020 then as every year 2011_2018 (dotted black)

Jim Hunt

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Re: Near Real Time Sea Ice Volume
« Reply #55 on: January 29, 2020, 10:31:20 AM »
Hi,

I build up an Near Real Time Sea Ice Volume (NRT SIV) product based on merged data from SMOS and Cyrosat2.

Hi Christian,

Sorry, but I hadn't spotted this thread before. At least my alter ego has now bumped into you on Twitter!

Please see:

http://GreatWhiteCon.info/2020/01/wheres-the-thickest-arctic-sea-ice-gone/#comment-311075

and

https://twitter.com/GreatWhiteCon/status/1222448934750162944
Reality is merely an illusion, albeit a very persistent one - Albert Einstein

Random_Weather

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Re: Near Real Time Sea Ice Volume
« Reply #56 on: February 05, 2020, 09:50:32 PM »
Hi Jim,

Yes i also done a new script which allows to estimate volume direct to sea ice concentration, thickness and the area of the grids, results looks like this



the only thing i think about is to add is again the nrt data, but analysis is just 2 weeks behind so for that, i think it must not

Glen Koehler

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Re: Near Real Time Sea Ice Volume
« Reply #57 on: February 05, 2020, 10:59:24 PM »
Interesting to have a near real time volume estimate.  Thanks for doing that.

What is the uncertainty range indicated on graph 95% CI (2.5% to 97.5% of estimate distribution)?

Is the current value calculated with same sources and methods as the 2011-2018 average?

How the Volume estimate using this method compare to PIOMAS volume for same dates?

Random_Weather

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Re: Near Real Time Sea Ice Volume
« Reply #58 on: February 06, 2020, 07:48:05 AM »
Interesting to have a near real time volume estimate.  Thanks for doing that.

What is the uncertainty range indicated on graph 95% CI (2.5% to 97.5% of estimate distribution)?

Is the current value calculated with same sources and methods as the 2011-2018 average?

How the Volume estimate using this method compare to PIOMAS volume for same dates?

Its min/max value + unc of the instruments, in a more formal way:

max_min+-Unc = Max_Min(Volume) for the Date +- the Volume of the instrumental Uncertainy (which is often 0.1m in Thickness)

to the rest:

Its calculated all the same way, as you note at the first side of the thread here, there is a figure of compare PIOMAS, Cyrosat2 and this product

greets


shendric

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Re: Near Real Time Sea Ice Volume
« Reply #59 on: February 11, 2020, 11:53:33 AM »
Hi all users of the CryoSat-2/SMOS sea-ice thickness dataset,

please be aware that the latest thickness maps have to be taken with a grain of salt, as the near-realtime input data from CryoSat-2 is currently not complete:

https://spaces.awi.de/display/SIRAL/2020/02/11/CryoSat-2+-+missing+NRT+data+in+baseline-D

We will update the CS2SMOS data set with the complete reprocessed CryoSat-2 data at a later stage. I however don't think that the sea ice volume estimates will change much. The merging algorithm is quite forgiving for data gaps. 

Stefan

Jim Hunt

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Re: Near Real Time Sea Ice Volume
« Reply #60 on: February 11, 2020, 12:39:00 PM »
Hi all users of the CryoSat-2/SMOS sea-ice thickness dataset,

Thanks Stefan,

See also the "developers" version:

https://forum.arctic-sea-ice.net/index.php/topic,3000.0.html

Constructive criticism welcome!
Reality is merely an illusion, albeit a very persistent one - Albert Einstein