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Author Topic: Home brew AMSR2 extent & area calculation  (Read 1423344 times)

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3400 on: August 04, 2019, 08:26:23 AM »
Total extent drop -93.6k, it is eating into the CAB now as well (-38.2k). Here is a diff with the previous day.

Bright red/blue: loss/gain of extent (crossing the 15% concentration limit). Light red/blue:  concentration change more than 7%. 

Click for the hi-res picture.

binntho

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Re: Home brew AMSR2 extent & area calculation
« Reply #3401 on: August 04, 2019, 08:57:41 AM »
Thanks Wipneus, I really love these diff pictures!
because a thing is eloquently expressed it should not be taken to be as necessarily true
St. Augustine, Confessions V, 6

Shared Humanity

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Re: Home brew AMSR2 extent & area calculation
« Reply #3402 on: August 04, 2019, 04:09:19 PM »
From that image, we should expect that the melt progress on Pacific side of the CAB will determine this years minimum.

Killian

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Re: Home brew AMSR2 extent & area calculation
« Reply #3403 on: August 05, 2019, 11:13:40 AM »
Total extent drop -93.6k, it is eating into the CAB now as well (-38.2k). Here is a diff with the previous day.

Bright red/blue: loss/gain of extent (crossing the 15% concentration limit). Light red/blue:  concentration change more than 7%. 

Click for the hi-res picture.

You using a trailing average or single day for extent above, Wipneus?

oren

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Re: Home brew AMSR2 extent & area calculation
« Reply #3404 on: August 05, 2019, 11:25:19 AM »
You using a trailing average or single day for extent above, Wipneus?
I recommend to read the top post of this thread, where Wipneus explained his algorithm. The values are single day, although there is filtering of spurious ice and false coastal ice.

be cause

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Re: Home brew AMSR2 extent & area calculation
« Reply #3405 on: August 05, 2019, 11:50:05 AM »
love seeing this thread alive again .. cheers Wipneus .. :)   b.c.
2007 + 5 = 2012 + 4 = 2016 + 3 = 2019 ...

Alison

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Re: Home brew AMSR2 extent & area calculation
« Reply #3406 on: August 05, 2019, 12:00:25 PM »
+1

petm

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Re: Home brew AMSR2 extent & area calculation
« Reply #3407 on: August 15, 2019, 01:41:35 AM »
Wipneus, your graphs from the top post stopped updating about a week ago.

SATire

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Re: Home brew AMSR2 extent & area calculation
« Reply #3408 on: August 17, 2019, 12:13:14 PM »
I am worried about Wipneus. His updates were like a clock from Switzerland. How can I look at the state of sea ice without his product? This feels so 2012... 

oren

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Re: Home brew AMSR2 extent & area calculation
« Reply #3409 on: August 17, 2019, 03:14:53 PM »
Yeah I am sorely missing the Regional area and extent graphs

HapHazard

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Re: Home brew AMSR2 extent & area calculation
« Reply #3410 on: August 17, 2019, 04:25:04 PM »
I am assuming Wip is on a vacation / trip so is AFK.

Pipster

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Re: Home brew AMSR2 extent & area calculation
« Reply #3411 on: August 25, 2019, 03:28:04 AM »
Yeah I am sorely missing the Regional area and extent graphs
I have been too!  They are freshly updated now.
Thanks so much Wipneus!

petm

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Re: Home brew AMSR2 extent & area calculation
« Reply #3412 on: August 25, 2019, 04:18:22 PM »
Hooray, they're back!  :)

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3413 on: September 04, 2019, 09:02:49 AM »
The Google API that I am using to automatically update data and graphs has stopped working for me  ("Internal Server Error"). For the moment I am updating some files manually. Send me a PM if you favorite file is still from the 8th of August.

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3414 on: September 04, 2019, 09:07:31 AM »
A late century drop in extent shows there are still possibilities for second lowest place ( in my limited data set).

Here is an animation of the Arctic Basin compared with 2012. Click to start.

Rodius

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Re: Home brew AMSR2 extent & area calculation
« Reply #3415 on: September 04, 2019, 10:11:17 AM »
To me, even though 2012 was significantly lower in extent, 2019 look much worse.
2012 at least looked solid in the middle.
2019 looks like it is shattered to pieces.

VeganPeaceForAll

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Re: Home brew AMSR2 extent & area calculation
« Reply #3416 on: September 04, 2019, 10:15:52 AM »
Here is an animation of the Arctic Basin compared with 2012. Click to start.

That is a very good animation, really shows the bad state of the ice. How do you get the original pictures? Can you send a link?
Thanks

Wipneus

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Re: Home brew AMSR2 extent & area calculation
« Reply #3417 on: September 04, 2019, 02:55:55 PM »

That is a very good animation, really shows the bad state of the ice. How do you get the original pictures? Can you send a link?
Thanks

V. these are "original pictures" generated by me from binary data from the University of Hamburg.

Perhaps have a look at the first few posts in this thread for more explanations. The current location of the data files are here:
ftp://ftp-projects.cen.uni-hamburg.de/seaice/AMSR2/3.125km

dnem

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Re: Home brew AMSR2 extent & area calculation
« Reply #3418 on: September 04, 2019, 05:03:28 PM »
To me, even though 2012 was significantly lower in extent, 2019 look much worse.
2012 at least looked solid in the middle.
2019 looks like it is shattered to pieces.

I totally agree.  This is why I think ANY curve-fitting exercises using extent are a fools errand.  A-Team said several times "A complete late summer blow-out can happen any year" (or very similar words).  I would be shocked if we don't see, by 2030 or before, the late summer pack reduced to separate, isolated patches of ice pushed by wind and current against isolated islands and shores on the Atlantic side.