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uniquorn

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CryoSat-SMOS Merged Sea Ice Thickness
« on: December 06, 2021, 01:56:21 PM »
https://spaces.awi.de/display/CS2SMOS/CryoSat-SMOS+Merged+Sea+Ice+Thickness

Quote
Changelog
Fall 2021 Update (v2.4)

Input Data

    CryoSat-2 ICE baseline E data as primary altimeter data now used for the operational near real-time and reprocessed data generation from October 2021 and later. The previous data record (Nov 2010 till April 2021) is based on the previous L1B version (ICE baseline D).

Auxiliary Data

    Updated C3S sea ice type (interim) climate data record from version 1 to version 2 (reprocessed data only).
    Updated OSI-SAF operational sea ice type to version OSI-403-d.
    Updated mean sea surface from DTU15 to DTU21.

Algorithm

    Surface type classification: Sea ice mask is now based on 15% sea ice concentration threshold. The threshold was 70% in previous versions.
    Used `uncertainty´ field in OSI-403-d sea ice type files instead of parametrization based on `confidence` flags of previous versions.
    The sea ice thickness quality flag is no longer automatically set to ‘intermediate’ outside the central Arctic basin.

Product format and content

    Flag values of the status flag (l3c variable `status_flag`) have been changed. Flag value 0 is now `nominal` and other values have been shifted accordingly.
    Flag values of the quality flag (l3c variable `quality_flag`) have been changed. Flag value 0 is now `nominal` and the ‘no data’ has been moved to flag value 3.
    Various changes to the global and variable attributes to improve compliance with newer versions of the Climate & Forecast (CF) and Attribute Convention for Dataset Discovery (ACDD) standards.

Level-1 Pre-Processor

    Added L1 preprocessor for CryoSat-2 L1b for ICE baseline-E.

Points of Contacts
cs2smos-support@awi.de
Responsible Scientists
Robert Ricker, Stefan Hendricks, Xiangshan Tian-Kunze, Lars Kaleschke

uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #1 on: December 06, 2021, 02:03:40 PM »
1. Animation of v204 near real time .nc files using panoply diff32 palette limited from 0m to 4m
oct21-dec3 (5.5MB)

2. Interesting small negative anomaly on nov5
« Last Edit: December 06, 2021, 02:12:05 PM by uniquorn »

uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #2 on: December 06, 2021, 03:36:32 PM »
some history with volume(2010-2018)
https://spaces.awi.de/pages/viewrecentblogposts.action?key=CS2SMOS
Robert Ricker (20MB)
I've added a pause

Jim Hunt

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #3 on: December 06, 2021, 03:43:38 PM »
Reality is merely an illusion, albeit a very persistent one - Albert Einstein

uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #4 on: December 06, 2021, 03:48:57 PM »
Sorry Jim, I knew there was a thread somewhere but didn't think to look in dev.

Jim Hunt

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #5 on: December 06, 2021, 03:57:10 PM »
The topic is worthy of a more "mainstream" venue as well!

When I have a spare 5 minutes I'll see if can distinguish FYI from MYI.
Reality is merely an illusion, albeit a very persistent one - Albert Einstein

oren

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #6 on: December 12, 2021, 11:21:42 PM »
Thanks a lot for the above animations and information.

nadir

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #7 on: January 06, 2022, 04:44:57 PM »
Posting here the most recent chart by Zach Labe (grabbed it from his website https://sites.uci.edu/zlabe/arctic-sea-ice-volumethickness/ )

uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #8 on: January 20, 2022, 10:38:36 AM »
1. Animation of v204 near real time .nc files using panoply diff32 palette limited from 0m to 4m
oct21-jan17 (11.2MB)

2. Interesting small negative anomaly on jan2

uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #9 on: January 29, 2022, 10:02:54 PM »
Animation of v204 near real time .nc files using panoply diff32 palette limited from 0m to 4m
oct21-jan27 (12.8MB)

uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #10 on: February 17, 2022, 10:19:04 PM »
Animation of v204 near real time .nc files using panoply diff32 palette limited from 0m to 4m
oct21-feb15 (15.6MB)

Tor Bejnar

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #11 on: February 18, 2022, 04:21:26 PM »
It might be interesting to overlap this ice thickness animation with an ice drift animation (such as found on the Nares Thread). 

The late (in the above animation) ice thinning in southern Lincoln Sea (white to yellow), for example, is associated with the active Nares Strait "funnel".  The thickening area north of Greenland, on the other hand, appears not to move (just thicken), even as Fram-beckoned ice passes by.  (I can 'see' the dynamic of ice thickening as it reaches the north-of-Greenland area, then statistically thinning (by addition of leads) as it approaches Fram Strait.)
Arctic ice is healthy for children and other living things because "we cannot negotiate with the melting point of ice"

uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #12 on: March 08, 2022, 10:40:07 PM »
good idea, maybe in april when it closes down for the summer.

Animation for feb1-mar6 (5MB)

vox_mundi

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #13 on: March 10, 2022, 07:21:18 PM »
New Observations From ICESat-2 Show Remarkable Arctic Sea Ice Thinning In Just Three Years
https://phys.org/news/2022-03-icesat-remarkable-arctic-sea-ice.html

Over the past two decades, the Arctic has lost about one-third of its winter sea ice volume, largely due to a decline in sea ice that persists over several years, called multiyear ice, according to a new study. The study also found sea ice is likely thinner than previous estimates.

Arctic sea ice snow depth is estimated, for the first time, from a combination of lidar (ICESat-2) and radar (CryoSat-2) data. Using these estimates of snow depth and the height of sea ice exposed above water, the study found multiyear Arctic sea ice has lost 16% of its winter volume, or approximately half a meter (about 1.5 feet) of thickness, in the three years since the launch of ICESat-2.

"We weren't really expecting to see this decline, for the ice to be this much thinner in just three short years," said lead study author Sahra Kacimi, a polar scientist at the California Institute of Technology's Jet Propulsion Laboratory.

Scientists make satellite estimates of sea-ice thickness using snow depth and the height of the floating ice above the sea surface. Snow can weigh ice down, changing how ice floats in the ocean. The new study compared ice thickness using new snow depths from satellite radar and lidar to previous ice thickness and snow depth estimates from climate records. The researchers found using climatology-based estimates of snow depth can result in overestimating sea-ice thickness by up to 20%, or up to 0.2 meters (0.7 feet).

The study used an 18-year record of sea-ice observations from ICESat and the newer ICESat-2 and CryoSat-2 satellites to capture monthly changes in Arctic sea-ice thickness and volume, to provide context for sea ice thickness estimates from 2018 to 2021. The 18-year record showed a loss of about 6,000 cubic kilometers of winter ice volume, largely driven by the switch from predominantly multiyear ice to thinner, seasonal sea ice.

Older, multiyear ice tends to be thicker and therefore more resistant to melting. As that "reservoir" of old Arctic sea ice is depleted and seasonal ice becomes the norm, the overall thickness and volume of Arctic sea ice is expected to decline. "Current models predict that by the mid-century we can expect ice-free summers in the Arctic, when the older ice, thick enough to survive the melt season is gone," Kacimi said.

"This is really old ice we're losing at quite a frightening rate," Mallett said.

Sahra Kacimi et al, Arctic snow depth, ice thickness and volume from ICESat‐2 and CryoSat‐2: 2018‐2021, Geophysical Research Letters (2022)
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL097448
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uniquorn

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #14 on: March 31, 2022, 12:31:28 AM »
It might be interesting to overlap this ice thickness animation with an ice drift animation (such as found on the Nares Thread).<>
Animation of v204 near real time .nc files using panoply diff32 palette limited from 0m to 4m, AWI LEADS overlaid, colour inverted, and white set to transparent (20MB)
oct21-mar28, small
maybe a bit heavy on the leads
« Last Edit: March 31, 2022, 12:38:14 AM by uniquorn »

oren

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #15 on: March 31, 2022, 08:44:19 AM »
A great animation, truly. The movements shown by Leads affect thickness distribution as measured by CS2SMOS, this is best shown near the Fram.
One can also see how the Barents storms pushing the ice edge into the northern Kara increase the thickness of the ice against Novaya Zemilya due to compaction even while reducing extent.

Tor Bejnar

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #16 on: March 31, 2022, 07:43:44 PM »
Thank you so much Uniquorn!  The Lincoln Sea thinning due to Kane export is apparent [as was 'obvious' previously].  A couple of the thickest (final) ice locations have apparent cessations of drift movement during the animation (north of Greenland [a surprise to me] and north of the Canadian Arctic Archipelago [CAA - not a surprise to me).

The 'over-emphasized' leads were just right, from my point-of-view.
Arctic ice is healthy for children and other living things because "we cannot negotiate with the melting point of ice"

gerontocrat

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Re: CryoSat-SMOS Merged Sea Ice Thickness
« Reply #17 on: March 31, 2022, 09:46:22 PM »
New Observations From ICESat-2 Show Remarkable Arctic Sea Ice Thinning In Just Three Years
https://phys.org/news/2022-03-icesat-remarkable-arctic-sea-ice.html

The study used an 18-year record of sea-ice observations from ICESat and the newer ICESat-2 and CryoSat-2 satellites to capture monthly changes in Arctic sea-ice thickness and volume, to provide context for sea ice thickness estimates from 2018 to 2021. The 18-year record showed a loss of about 6,000 cubic kilometers of winter ice volume, largely driven by the switch from predominantly multiyear ice to thinner, seasonal sea ice.

Sahra Kacimi et al, Arctic snow depth, ice thickness and volume from ICESat‐2 and CryoSat‐2: 2018‐2021, Geophysical Research Letters (2022)
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL097448

Interestingly enough, the PIOMAS data for the April Monthly Average (i.e. month of maximum volume) shows a 4.75 thousand KM3 volume loss for the 18 years from 2003 to 2021.

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