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Messages - nukefix

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Arctic sea ice / Re: IJIS/JAXA
« on: August 30, 2013, 11:13:41 AM »
A drop of -89k4, but it is based on few 3 swaths:
It's interesting to compare that image to the ASCAT-based classification from the same day:

They seem to be seeing practically the same thing, at least in the Laptev and Kara seas. 

Arctic sea ice / Re: EUMETSAT Sea Ice products?
« on: August 30, 2013, 11:02:06 AM »
Neven, could you add links to the sea ice concentration from OSI SAF onto the Graphs Page?

Antarctica / Re: Potential Collapse Scenario for the WAIS
« on: August 29, 2013, 03:27:59 PM »
How would one stop the potential collapse from happening? I have the feeling that even stopping greenhouse-gas emissions completely doesn't necessarily stop it. That leaves us with terraforming.

Antarctica / Re: Glaciology Basics and Risks - Uncertainties
« on: August 25, 2013, 04:23:08 PM »
Agreed on convergence of the sliding streams. For some detail compare surface velocities in the attached figure 1 from  Rignot(2008, doi:10.1038/ngeo102).
Rignot's group has produced a new map with much improved coverage, see here:

Arctic sea ice / Re: EUMETSAT Sea Ice products?
« on: August 24, 2013, 08:02:17 PM »
I gave the same link one hour and 5 min. earlier in "the canary in the coal mine". Just curious, How did you happen on the link?
Pure coincidence, I'm a satellite-guy and was wondering why Metop was underrepresented. :o

Clouds should have only a negligible effect at C-band - something else is going on.
Then why are clouds plainly visible over open water areas on the images?
That must be the effect of winds on sea-surface roughness (at centimeter-scale), the main product from ASCAT is sea-surface winds after all. High winds -> high surface roughness -> high backscatter.

edit: so very low backscatter means either dead calm open water or a very thin layer of new ice, both of which create very smooth surfaces.

Now as I understand, ASCAT operates on moisture content reflectivity. You can clearly see the reflective “mesh-pack” stand out, the Pole-hole on the fringe, the bleak FYI into the ESAS.
It's a C-band scatterometer, so moisture content and surface roughness affect the backscatter a great deal.
Quote from: werther
To the south (right), two long loops of clouds stand out; one over the Fram, another over the Barentsz Sea. The mid-tone suppression faded almost all other clouds, so you can imagine the water vapour content these bands contain to appear on this pic.
Clouds should have only a negligible effect at C-band - something else is going on.

Arctic sea ice / EUMETSAT Sea Ice products?
« on: August 24, 2013, 12:07:51 PM »

I did not see Eumetsat sea ice products in the Daily Graphs page, I think some of them should add value:

I think ASCAT should be used more in daily analysis, after all it images through clouds, albeit at a rather low resolution.

edit: here's the 12.5km product from today from KNMI:

and main page:

Antarctica / Re: Active destabilization of WAIS?
« on: March 03, 2013, 11:26:11 AM »
So let's say one explosion breaks one cubic kilometer of ice (probably an understatement due to the generated shockwaves). Would such a disturbance in an "optimal" location cause runaway grounding-line retreat, or is such an insult too small by an order of magnitude or two? I guess this is something only modellers can answer.

Antarctica / Active destabilization of WAIS?
« on: March 01, 2013, 10:38:07 AM »
I know this is a scenario from a Bond-film but I've been wondering about the following:

- Would it be possible to destabilize WAIS (at least partly) and cause an acceleration of SLR with a couple of well places nukes?

- Penetrator-missiles could place the nukes at the rock-ice interface at suitable locations upstream of the grounding lines of the Pine Island and Thwaites glaciers.

- Could the ice-stream recover balance after this insult or would this trigger dynamic instabilities and destabilization?

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