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Messages - AvantGuardian

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Arctic sea ice / Re: The 2018 melting season
« on: August 15, 2018, 12:19:33 PM »
Some sentinel playground shots of the ice in the north Beaufort off the mid CAA.
And a couple of the shrapnel pouring out of the CAA into Foxe basin. Sentinel may have a tricky and frustrating interface to master. But its worth taking the time. The 250m pixel size on worldview can make stuff like this look like solid ice that's not moving. Clearly not  true.

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Arctic sea ice / Re: The 2018 melting season
« on: August 14, 2018, 10:47:19 AM »
More good sentinel images available of the Lincoln. There's actually lots of recent clear ones off the CAA quite far out into the basin, and over the ESAS where the central packs been getting expelled. This stuff in the Lincoln actually looks in the best condition of anywhere. The biggest floe in the sea zoomed in on. And an area of 100% concentration, area, and extent, because the gaps are below 250m ::)

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Arctic sea ice / Re: SMOS
« on: August 14, 2018, 12:58:58 AM »
11, 12 Aug smas


Re: SMOS
« Reply #88 on: Today at 01:35:38 PM »
Note: This message is awaiting approval by a moderator.
I've asked my professors and C/O about your questions sir. Thank you for asking sir.
They believe this seems to show the results of the hot and humid winds that blew from the Atlantic front, for most of the preceding week right across the pole to the  Chukchi and Siberian theatre. This pushed a lot of the floes in the central pack 20-40 degrees to the right of the wind direction, and caused a lot of surface melting in the active corridor also. A lot of meltwater was pushed out of the pack onto the ESAS, and into the CAA, because winds move the surface waters faster than ice floes. And large gaps within the pack allowed the high winds to create a large storm surge. Now that the winds have reversed direction, the cooling effect of them blowing over heavily fractured ice distributed in  highly saline surface waters, is causing surface crusting on the floes, and meltwater flooded surface channels and ponds of the central pack causing this area to read as thicker than it actually is.
Regarding how this compares with SMOS datasets from previous years. My superiors suggest that the high surface salinity and fragmented pack is causing SMOS to overstate thickness relative to previous years.

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Arctic sea ice / Re: SMOS
« on: August 13, 2018, 03:10:57 AM »
Looks like this is the place where usnavy and German data is not unwelcome. So someone needs to post the SMOs and us navy stuff here huh.

5
Arctic sea ice / Re: The 2018 melting season
« on: August 12, 2018, 11:51:02 AM »
Sentinel has some new shots of the Lincoln Sea. Holy smoke, did it melt out fast or what!
Looking at the SST bandits inbound, I suppose its not surprising. Must be chewing the bums outa the glaciers in Greenland, Awful lots meltwater being flushed out the Nares and all round the edges of the basin too.

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Arctic sea ice / Re: The 2018 melting season
« on: August 10, 2018, 05:19:22 PM »
I've been looking at that area off Siberia that some guys are saying might survive. Is that dirty yellow green look the fires? My Prof sez it's probably just algae.
It sure looks a lot bluer in the bottom one. Which is north of Nares.

https://apps.sentinel-hub.com/sentinel-playground/?source=S2&lat=74.89179996842871&lng=160.19989013671875&zoom=12&preset=8_BATHYMETRIC&layers=B01,B02,B03&maxcc=20&gain=0.9&gamma=1.2&time=2015-01-01%7C2018-08-07&atmFilter=ATMCOR&showDates=false

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Arctic sea ice / Re: The 2018 melting season
« on: August 07, 2018, 08:52:38 PM »
Doing a 'reality check', I'm zooming in on an area of thick ice.

Arctic ice thickness (CICE), via yesterday's Navy website [I ignore certificate issues.] shows lots of 2 to 4 meter ice in the Lincoln Sea.  (Color scale pasted into image).  WorldView shows the Lincoln Sea to be filled with a loose mélange with some larger floes that I presume are thick (probably 3 meters or more thick). [Scale moved to be within view.] An arrow points to a floe that, in the Sentinel Hub image (note 3 km scale),  is in the lower right corner.  This shows much of the mélange to be floes, some 5 km across or more, but many on the order of 50-500 meters across.  (Arrow points to corner of floe that is in the lower left corner of 200m scaled enlargement.)  These are plenty big enough to be 2 or more meters thick. [Sentinel-hub doesn't go north of this location.]  See the melt ponds on the enlargement.

Even if it is mostly thick floes, there are a lot of floe edges that can chip away (wind-induced bumper-car style destruction) or melt (wave assisted).
Take a closer look at your sentinel images. Those Floes are loosely bound chunks of rotten ice that have been pushed together and poorly glued by freezing meltwater. Some of those chunks may be up to a couple of meters thick but you can see bigholes everywhere with the ocean showing through. Those are not meltponds.

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Arctic sea ice / Re: The 2018 melting season
« on: August 07, 2018, 04:46:53 AM »
you may want to pay attention to the SSS.

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