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Author Topic: Daily SMOS Ice Thickness available: season 2015/2016  (Read 58733 times)

Wipneus

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Daily SMOS Ice Thickness available: season 2015/2016
« on: September 24, 2013, 09:25:05 AM »
From the Uni Hamburg Integrated Climate Data Center:

Quote
New Data: SMOS Sea Ice Thickness 20.09.2013
By: Stefan Kern

Now, after almost 4 years of operation of the Soil Moisture and Ocean Salinity (SMOS) satellite, we can offer daily sea ice thickness estimates calculated from SMOS data for the Arctic for freezing seasons 2010/11 to 2012/13 via the ICDC web portal:

http://icdc.zmaw.de/l3c_smos_sit.html?&L=1.

SMOS is European Space Agency’s (ESA) Soil Moisture and Ocean Salinity mission measuring the Earth radio emission at 1.4GHz. At this frequency ice is semi transparent, so the measured brightness can be used to calculate thickness.

Important disadvantages are 1) only measures thin ice up to about 0.5m 2) not usable in the melting season (15 April-15 Oktober).

Do read the "Data Quality" section in the link given above when interpreting the SMOS data.


« Last Edit: October 24, 2015, 12:28:28 PM by Wipneus »

Jim Hunt

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Re: Daily SMOS Ice Thickness available.
« Reply #1 on: September 24, 2013, 06:24:56 PM »
Most interesting. Thanks for the heads up Wipneus.

Will October 2013 data become available "in real time"?
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Wipneus

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Re: Daily SMOS Ice Thickness available.
« Reply #2 on: September 24, 2013, 07:51:49 PM »
Most interesting. Thanks for the heads up Wipneus.

Will October 2013 data become available "in real time"?

That would be interesting indeed, but I have not seen an indication how frequently they plan to update.
The calculation needs surface air temperature which comes from a reanalysis. So some delay is unavoidable.

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Re: Daily SMOS Ice Thickness available.
« Reply #3 on: September 25, 2013, 12:06:34 PM »
Will October 2013 data become available "in real time"?

At least the brightness temperature data updates every day 9:00 UTC: https://icdc.zmaw.de/thredds/catalog/ftpthredds/smos_tb/2013/09/catalog.html

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Re: Daily SMOS Ice Thickness available.
« Reply #4 on: September 28, 2013, 10:17:38 PM »
We will soon update the SMOS ice thickness with a similar latency as the brightness temperature.  ;)


Cheers

Lars

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Re: Daily SMOS Ice Thickness available.
« Reply #5 on: September 29, 2013, 09:59:38 AM »
We will soon update the SMOS ice thickness with a similar latency as the brightness temperature.  ;)

Highly appreciated.

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Re: Daily SMOS Ice Thickness available.
« Reply #6 on: September 29, 2013, 10:18:05 AM »
We will soon update the SMOS ice thickness with a similar latency as the brightness temperature. 

Much appreciated here too Lars!
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Re: Daily SMOS Ice Thickness available.
« Reply #7 on: October 04, 2013, 07:07:19 PM »
Spam removed, thanks everyone.
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Re: Daily SMOS Ice Thickness available.
« Reply #8 on: October 04, 2013, 08:44:45 PM »
Spam removed, thanks everyone.

Or so he thought....



Reported to moderator as SPAM.

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Re: Daily SMOS Ice Thickness available.
« Reply #9 on: October 04, 2013, 10:37:24 PM »
I think I'll that one stand.  ;D
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Re: Daily SMOS Ice Thickness available.
« Reply #10 on: October 21, 2013, 09:20:41 PM »
Now the process is up and running.  ;)

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Re: Daily SMOS Ice Thickness available.
« Reply #11 on: October 22, 2013, 08:15:33 AM »
Now the process is up and running.  ;)

Thanks a lot guys.

At first I was looking at a wrong ftp directory, but the NetCDF data is here

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Re: Daily SMOS Ice Thickness available.
« Reply #12 on: October 22, 2013, 10:45:19 PM »
Interesting to compare against Ascat. A bit hidden in shades of blue are the long and slim patches of MYI that broke off direction Beaufort. Checked against wind data, looks plausible.



« Last Edit: October 22, 2013, 11:04:35 PM by arcticio »

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Re: Daily SMOS Ice Thickness available.
« Reply #13 on: October 23, 2013, 11:44:13 AM »
A bit hidden in shades of blue are the long and slim patches of MYI that broke off direction Beaufort.

We have to be careful with interpretations here, those shades of blue are above 0.5m the upper limit that SMOS can "measure" thickness.

For the moment I cut everything above 0.6m off to concentrate on what SMOS can measure.
The attached animation does indicate (with more confidence than the amsr2 images) that the Fram Strait transport is filling up the northern Greenland Sea.

(click on attached image for an animation)
« Last Edit: October 23, 2013, 06:49:01 PM by Wipneus »

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Re: Daily SMOS Ice Thickness available.
« Reply #14 on: October 23, 2013, 10:18:50 PM »
Wipneus, I know, and there is an error reported with each pixel. But the min/max of the "shades of blue" in the mentioned region are large enough for me to investigate. If a thickness pattern remains over several days I'm quite sure it is real, whether the absolute thickness is correct is another question.

Currently I exclude everything below 3cm and above 150cm. That gives me moving clouds faking thickness changes, but even above 100cm some structures remain or reappear.

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Re: Daily SMOS Ice Thickness available.
« Reply #15 on: January 29, 2014, 03:56:53 PM »
27 January sea ice thickness by SMOS.

Top 2011 & 2012
Below 2013 & 2014


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Re: Daily SMOS Ice Thickness available.
« Reply #16 on: January 30, 2014, 01:58:08 AM »
27 January sea ice thickness by SMOS.

Top 2011 & 2012
Below 2013 & 2014

Interesting, Wipneus.  One thing that I don't see is any obvious correlation between the year over year state of the ice at this juncture, and what happened during the following melt season.
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Re: Daily SMOS Ice Thickness available.
« Reply #17 on: March 02, 2014, 09:13:10 AM »
Animation covering Februari (26 and 28 are missing). I have added some grey's for thickness up to 1.5m, these may indicate some ice property but probably not thickness. Above 0.5 meter there just isn't enough detectable signal. It might give some indication on ice movement though.

The big ice retreat in the Barents sector and around Svalbar can be viewed from ice thickness point of view. A rather permanent low thickness band in the Laptev Sea can be seen, it includes a polynya near the Severnaya Zemlya islands. Probably not unusual if you look at my previous post.

(click the attached image for the animation)

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Re: Daily SMOS Ice Thickness available.
« Reply #18 on: March 03, 2014, 08:36:32 AM »
Very interesting stuff, Wipneus! Somehow I overlooked this thread or forgot about it.
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Wipneus

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Re: Daily SMOS Ice Thickness available.
« Reply #19 on: March 03, 2014, 09:54:19 AM »
Thanks, here is thickness by SMOS on the first of March 2011-2014.

(reminder: SMOS can only calculate thickness up to about 0.5m. The grey's in the images are probably not an indication of thin ice)

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Re: Daily SMOS Ice Thickness available.
« Reply #20 on: March 05, 2014, 08:42:07 PM »
This short tutorial explains how to access SMOS datasets with the OpenNDAP protocol:
http://earthpy.org/smos_sea_ice_thickness.html

Cheers

Lars

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Re: Daily SMOS Ice Thickness available.
« Reply #21 on: March 13, 2014, 12:38:23 PM »
A noobie question for Lars and/or Wipneus.

If I look at the two GIFs available at https://icdc.zmaw.de/thredds/catalog/ftpthredds/smos_sea_ice_thickness/catalog.html it seems as if the uncertainty is greater than the thickness. Have I completely misunderstood things, or are the titles of the two charts back to front, or is my initial interpretation in fact correct?!
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Re: Daily SMOS Ice Thickness available.
« Reply #22 on: March 13, 2014, 01:12:20 PM »
A noobie question for Lars and/or Wipneus.

If I look at the two GIFs available at https://icdc.zmaw.de/thredds/catalog/ftpthredds/smos_sea_ice_thickness/catalog.html it seems as if the uncertainty is greater than the thickness. Have I completely misunderstood things, or are the titles of the two charts back to front, or is my initial interpretation in fact correct?!

Quote
We have to be careful with interpretations here, those shades of blue are above 0.5m the upper limit that SMOS can "measure" thickness.

If I interpret that correctly if the ice is over 0.5m thick, SMOS has no idea how thick so a range of 0.5m to 20m or however high ridges get these days would be an appropriate range. So a lot of the area is shown as >1m +/- >1m should be interpreted as >0.5m up to as high as ridges get in that area.

It perhaps has more potential to be useful around the edges with thin ice (but perhaps a rather larger proportion of the area in late summer).

Does 0.3m +/- 0.7m mean anything up to 1m?

if so 02m +/- 0.6m means anything up to 0.8m and is slightly more likely than not to be thinner than 0.3m +/- 0.7m.

This doesn't seem as if it gives a huge amount of information but maybe it is better towards the minimum?

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Re: Daily SMOS Ice Thickness available.
« Reply #23 on: March 16, 2014, 01:52:45 PM »
Both an animation of the last 3 weeks and a collage of March 14 of 2011-2014.

(remember SMOS measures only thin (< 0.5m) ice, variations above that (the grey's) are probably not an indication of thickness)

(I had to make the animation small, somehow the normal sized version did not work )
« Last Edit: March 16, 2014, 02:15:03 PM by Wipneus »

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Re: Daily SMOS Ice Thickness available.
« Reply #24 on: March 16, 2014, 01:54:19 PM »
The collage in a separate post.

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Re: Daily SMOS Ice Thickness available.
« Reply #25 on: March 16, 2014, 11:10:06 PM »
WN, in the collage Bering and Okhotsk seem to be cut off in all years except 2014. Is there a reason for that?
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Re: Daily SMOS Ice Thickness available.
« Reply #26 on: March 22, 2014, 11:10:49 AM »
WN, in the collage Bering and Okhotsk seem to be cut off in all years except 2014. Is there a reason for that?

We changed the processing and extrapolated the salinity from the ocean model. The currently used ocean reanalysis configuration does not include the Pacific.

Lars

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Re: Daily SMOS Ice Thickness available.
« Reply #27 on: March 22, 2014, 11:13:39 AM »

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Re: Daily SMOS Ice Thickness available.
« Reply #28 on: April 02, 2014, 04:13:35 PM »
New animation of three weeks of SMOS sea ice thickness development.

(animation starts after you click the picture)

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Re: Daily SMOS Ice Thickness available.
« Reply #29 on: April 02, 2014, 04:18:31 PM »
And an image comparing SMOS sea ice thickness 2010-2014.

As before: SMOS gives information of ice thickness in a range below 0.5m. The "grey" part of the scale may indicate other parameters than thickness.

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Re: Daily SMOS Ice Thickness available.
« Reply #30 on: April 02, 2014, 06:36:58 PM »
Thanks for the comparisons Wipneus!

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Re: Daily SMOS Ice Thickness available.
« Reply #31 on: April 02, 2014, 11:36:03 PM »
Yes, they are awesome. I will use the next comparison for my winter analysis.
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Wipneus

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Re: Daily SMOS Ice Thickness available.
« Reply #32 on: April 03, 2014, 10:56:43 AM »
Yes, they are awesome. I will use the next comparison for my winter analysis.

Yes, April 15 the SMOS season will end.

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Re: Daily SMOS Ice Thickness available.
« Reply #33 on: April 16, 2014, 09:06:01 AM »
A noobie question for Lars and/or Wipneus.

If I look at the two GIFs available at https://icdc.zmaw.de/thredds/catalog/ftpthredds/smos_sea_ice_thickness/catalog.html it seems as if the uncertainty is greater than the thickness. Have I completely misunderstood things, or are the titles of the two charts back to front, or is my initial interpretation in fact correct?!

Quote
We have to be careful with interpretations here, those shades of blue are above 0.5m the upper limit that SMOS can "measure" thickness.

If I interpret that correctly if the ice is over 0.5m thick, SMOS has no idea how thick so a range of 0.5m to 20m or however high ridges get these days would be an appropriate range. So a lot of the area is shown as >1m +/- >1m should be interpreted as >0.5m up to as high as ridges get in that area.

It perhaps has more potential to be useful around the edges with thin ice (but perhaps a rather larger proportion of the area in late summer).

Does 0.3m +/- 0.7m mean anything up to 1m?

if so 02m +/- 0.6m means anything up to 0.8m and is slightly more likely than not to be thinner than 0.3m +/- 0.7m.

This doesn't seem as if it gives a huge amount of information but maybe it is better towards the minimum?

if there is a large error in small values, it is a constant bias, rather than noise; if you watch animations (like what is posted a few posts back) areas which are thin are consistently thin, they don't have lots of rand snow-noise as the error changes from one measurement to the next.

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Re: Daily SMOS Ice Thickness available.
« Reply #34 on: April 18, 2014, 09:23:37 AM »
Andy, sorry for releasing your comment so late. Due to problems with spam, first comments by new members are withheld until approved by me. I thought I would get notified, which is why I saw your comment just now.
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Wipneus

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Re: Daily SMOS Ice Thickness available.
« Reply #35 on: April 19, 2014, 08:36:34 AM »
This should be the last SMOS animation of the season, yet the data keeps coming in after April 15 when it stopped in previous years.
So here is the animation until the 17th. Note the crack in the East Siberian Sea and the retreat in the Bering and Barents seas.

(click the picture for that animation)

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Re: Daily SMOS Ice Thickness available.
« Reply #36 on: April 19, 2014, 08:40:13 AM »
And a collage of the SMOS maps of April 15 for the last 4 years.

(again be careful with interpreting the "grey" shades as SMOS cannot see beyond 0.5 meter of thickness)

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Re: Daily SMOS Ice Thickness available.
« Reply #37 on: April 19, 2014, 10:23:08 AM »
Thanks for that image, Wipneus. I'll use it for the winter analysis, although it's difficult to assess the situation compared to previous years. Differences seem to be minimal. Too bad SMOS stops now. A couple of weeks more would be really useful.
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Re: Daily SMOS Ice Thickness available.
« Reply #38 on: April 19, 2014, 02:57:48 PM »
Does this mean that the gray shaded areas are ice that is 0.5 meters or less? If this is so than 2014 looks better in this regard than the 3 years that have preceded it.

Wipneus

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Re: Daily SMOS Ice Thickness available.
« Reply #39 on: April 19, 2014, 04:08:17 PM »
Does this mean that the gray shaded areas are ice that is 0.5 meters or less? If this is so than 2014 looks better in this regard than the 3 years that have preceded it.

Gray ice is at least 0.5 m thick. That is all we know.

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Re: Daily SMOS Ice Thickness available.
« Reply #40 on: April 28, 2014, 02:44:40 PM »
The SMOS data should have ceased coming in by the 15th, yet it did not.
In the animation (up to the 26th) some images are (partially) missing though.

(click that picture for the animation)


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Re: Daily SMOS Ice Thickness available.
« Reply #41 on: October 15, 2014, 08:01:30 AM »
SMOS updates, unavailable during the melting season, have resumed. Here is the first one.

(the SMOS instrument can measure ice thickness up to 0.5m, anything above that may not be related to ice thickness).

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Re: Daily SMOS Ice Thickness available.
« Reply #42 on: October 20, 2014, 06:19:40 PM »
Thanks Wipneus, I was going to ask when this data would start flowing.

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Re: Daily SMOS Ice Thickness available.
« Reply #43 on: October 23, 2014, 08:13:48 AM »
Here is an animation of the first SMOS thickness images of the season (20th of October missing).
Things to watch:
-the start of the Beaufort Gyre
-flash freezing of the Kara Sea
-quick thickening in the Canadian Archipelago
-lack of refreezing on the Pacific side (Beaufort, Chukchi, East-East Siberian Sea)
-little Fram export

(click to start the animation)

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Re: Daily SMOS Ice Thickness available.
« Reply #44 on: October 23, 2014, 08:22:32 AM »
And here a collection of SMOS thickness images on October 21 of the past five years.
The 2014 situation has a bit of the previous 4 years, but what may be different is the greater extent in Kara, the thicker ice in the CAA and the very low levels of refreezing on the Pacific side (especially the ESS).

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Re: Daily SMOS Ice Thickness available.
« Reply #45 on: October 30, 2014, 08:05:39 AM »
An animation of ice thickness as monitored by the SMOS instrument.
What can be seen:
- fast closing of the Laptev open water by thin ice
- retreat of ice extent in the Barents and Greenland Seas
- thickening of the ice in Kara and (west) East Siberian Seas

(animation will start after a click)

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Re: Daily SMOS Ice Thickness available.
« Reply #46 on: October 30, 2014, 08:07:53 AM »
And a composition of 5 years of SMOS thickness at the 28th of Ocotber.

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Re: Daily SMOS Ice Thickness available.
« Reply #47 on: November 06, 2014, 09:21:27 AM »
Animation of SMOS ice thickness in the past 10 days. What can be seen:
-thickening in the Laptev and East Siberian Seas, the western part is curiously staying open;
-not so much in Kara anymore;
-expansion in the Barents and Beaufort Seas;
-lack of large scale ice movement

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Re: Daily SMOS Ice Thickness available.
« Reply #48 on: November 06, 2014, 09:24:30 AM »
And a comparison of the SMOS derived ice thickness on November 4. The open state in the westtern part of the East Siberian Sea is unique in this collection.

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Re: Daily SMOS Ice Thickness available.
« Reply #49 on: November 06, 2014, 08:00:20 PM »
I had a look today at the 30day speed and drift chart and the movement of ice has been very anticyclonic in nature for a good while - may explain that unique gap in the ESS, but this is due to peak over the next day or so before Nuri is predictd to move across the ESS area. Those strong flows are then due to cease ending with a forecast, strong, more linear movement from the beaufort towards the Fram/Barents area. Will be interesting to see just how a change from one strong flow to another will affect the ice free areas still left in the ESS