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Author Topic: AMSR2 Snow & Ice Volume/Thickness  (Read 11602 times)

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #50 on: March 07, 2019, 02:12:18 PM »
Only moderate increases in the AMSR2 Snow & Ice Volume. The St. Lawrence and Sea of Okhotsk ice
is too thin affect the overal numbers much.

Full size images and February animation at:
https://cryospherecomputing.tk/SIT
« Last Edit: April 02, 2019, 11:02:34 AM by Tealight »

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #51 on: April 02, 2019, 11:16:09 AM »
Only a moderate thickness increase and a complete volume stall in the second half of March, probably caused by the Bering Sea and Gulf of St Lawrence melt out.

Full size images and March animation at:
https://cryospherecomputing.tk/SIT

uniquorn

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #52 on: April 02, 2019, 03:24:17 PM »
<snippage>Full size images and February animation at:
https://cryospherecomputing.tk/SIT
Thanks for this Tealight. I carelessly missed the February animation. Can I download it from somewhere?

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #53 on: April 03, 2019, 12:49:18 AM »
<snippage>Full size images and February animation at:
https://cryospherecomputing.tk/SIT
Thanks for this Tealight. I carelessly missed the February animation. Can I download it from somewhere?

Sorry, but to keep the update process simple I only create one gif file per month which always replaces the old one.

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #54 on: May 03, 2019, 11:29:48 AM »
Another month of low overall gain, but above average thickness.

Full size images and April animation at:
https://cryospherecomputing.tk/SIT
« Last Edit: May 04, 2019, 11:22:04 AM by Tealight »

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #55 on: June 02, 2019, 01:01:30 AM »
Volume continued below the mean, but thickness went up at the end of the month. It looks like the Beaufort gyre compacted sea ice against eastern Siberia and Hudson Bay ice was compacted against the southern coast.

Full size images and May animation at:
https://cryospherecomputing.tk/SIT

gerontocrat

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #56 on: June 02, 2019, 01:46:06 AM »
Tealight, I have to say that Avatar of yours, Nico Sun, has got the gift, and boy, doesn't he use it well.

Stunning stuff. It will be fascinating to compare it with the output from PIOMAS, or has Nico got it in hand already?

No chance of numerical data in .csv format?

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"And that's all I'm going to say about that". Forrest Gump
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slow wing

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #57 on: June 02, 2019, 02:18:27 AM »
Thanks Tealight! Great stuff and very much appreciated!  :)

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #58 on: July 02, 2019, 08:41:19 PM »
Volume and thickness crashed to lowest during the second half of June. In the first half melt was apparently below average. The gif shows the Beaufort gyre in action transporting ice into the melt zone.

One should keep in mind that the product doesn't try to calculate actual ice thickness, but average thickness per ice covered gridcell. If you have an even 50/50 split of water and ice than the gridcell thickness is just 50% of the ice floes.

Full size images and June animation at:
https://cryospherecomputing.tk/SIT
« Last Edit: July 02, 2019, 11:21:18 PM by Tealight »

Rich

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #59 on: July 02, 2019, 09:17:10 PM »
Wow. It's not often that the term "crashed" feels like an understatement.

It looks like a 1/3 reduction in volume in 3 weeks if I'm reading the chart correctly.

Rich

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #60 on: July 03, 2019, 02:58:43 AM »
A question on the attached gif if you don't mind.

I'm quite surprised at the dramatic reduction in volume of the ice in the CAB north of Ellesmere and the CAA.

In the beginning of June, there is quite a bit of ice pack which is colored white (350+ cm) and that all seems to lose half of it's volume in June.

Keeping an eye on the weather this past month, I was caught by surprise that this area would change so much.

Any comment related to the root cause of change in this region would be welcome.


oren

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #61 on: July 03, 2019, 03:13:09 AM »
It's probably related to the appearance of melt ponds in the CAB. Please bear in mind the limitations of the instrument making these measurements.

https://ads.nipr.ac.jp/vishop/#/extent
Quote
Method for calculating sea ice thickness and melt ice concentration ratio products
The product of sea ice thickness and the melt pond concentration which is shown in the VISHOP is calculated from AMSR-E and AMSR2 data by using a research algorithm1) developed by K. Tateyama (Kitami Institute of Technology) and others in the Arctic research projects utilizing the IARC-JAXA Information System (IJIS) and satellite imagery (1st - 4th generations). This product is an essentially experimental and research product. This product has the effectiveness in the relative dry freezing seasons such as autumn, winter and spring (September – May), but cannot provide the accurate sea ice thickness in melting wet season (June - August) because the sea ice surface is covered by melt ponds.
This product is opened to the public for the usages of research and validation of algorithms. The Arctic Data archive System (ADS) is not liable for any loss or damage resulting from the use of this data.
Reference
1)   Krishfield, R. A., A. Proshutinsky, K.Tateyama, W. J. Williams, E. C. Carmack, F. A. McLaughlin, and M.-L. Timmermans (2014), Deterioration of perennial sea ice in the Beaufort Gyre from 2003to 2012 and its impact on he oceanic freshwater cycle, J. Geophys. Res.Oceans, 119, doi:10.1002/2013JC008999.

Rich

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #62 on: July 03, 2019, 03:41:09 AM »
Thanks Oren.

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #63 on: August 02, 2019, 10:03:48 AM »
Volume and thickness were record low until the second half of the month and then lost slightly out to 2012 and 2016.

Full size images and June animation at:
https://cryospherecomputing.tk/SIT

Tealight

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Re: AMSR2 Snow & Ice Volume/Thickness
« Reply #64 on: September 02, 2019, 06:54:43 PM »
Volume and thickness are the same league as 2012 and 2016, but the minimum might have already happened.

Full size images and August animation at:
https://cryospherecomputing.tk/SIT