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Peakoil.com :: View topic - Record Ice Loss in Arctic 2008
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Record Ice Loss in Arctic 2008
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dohboi
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PostPosted: Thu Aug 14, 2008 4:54 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

The tale of the tape continues to plummet.

drop

We are slightly above last year's record-obliterating ice coverage for this time of year, but far below any other year on record, and still dropping.

As tanada points out, it's all about the cloud coverage now till polar night kicks in. Interesting indeed.
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Tanada
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PostPosted: Thu Aug 14, 2008 6:03 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

dohboi wrote:
The tale of the tape continues to plummet.

drop

We are slightly above last year's record-obliterating ice coverage for this time of year, but far below any other year on record, and still dropping.

As tanada points out, it's all about the cloud coverage now till polar night kicks in. Interesting indeed.


The last decade in the Arctic has been so starkly different that it is easy to forget how recent these massive losses became a frequent phenomenom.

Looking back at the tale of the tape we can clearly see that 1994 was the last year with a high average through most of the year and march 2003 was the last time we actually exceeded average ice cover at any time during the year. Since around mid April 2003 the record shows we have been below the long term ice cover average and the trend has continued downward.

While any graph will show natural variation over tuime if you look at this one in its entirety you will see that the high years are almost all early on in the series and they never exceed 1 million over average ice cover, while on the below average side from September 1996 to present the graph has been averaging on a steadily lower level.

Starting in 2001 and every year since the graph shows that Arctic ice cover has at least briefly dipped more than 1 million below the long term average, and by 2005 it was dipping below the 1.5 million under average. Even if this year does not meet or exceed last years 3 million below average I am now confident it will exceed 2 million below average which only happened the first time last summer.
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dohboi
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PostPosted: Fri Aug 15, 2008 11:33 am    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

Well put, as usual, tanada. Even if we don't break last years phenomenal record, this year is seeing stunning reduction from the records over the last few decades.

These are many of the reasons that I find the tale of the tape chart to be among the most useful both day to day (it seems to be updated every two days or so) and for the longer perspective (that is in terms of decades, not millennia). I sometimes mark a piece of paper to do more precise comparisons between years at particular times, though doubtless there is some higher-tech way of doing this.
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Bas
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PostPosted: Sat Aug 16, 2008 9:16 am    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

here's an interesting little sidenote:

Quote:
A Canadian team is to search for two ships lost in an 1845 expedition to find the Northwest Passage.

The British ships HMS Erebus and HMS Terror were trapped in the Arctic ice as Sir John Franklin sought a northern route from the Atlantic to the Pacific.

He and his 128 crew died - although their exact fate remains a mystery - and the ships were never found.


Quote:
Retreating Arctic ice has made the Northwest Passage much more accessible and Canada is also using the search as a way of asserting its sovereignty over the region.



BBC news
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GregWatson
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PostPosted: Sat Aug 16, 2008 12:18 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

The main NW passage, via Canada, is now OPEN:

http://www.iup.uni-bremen.de:8084/amsr/arctic_AMSRE_visual.png

Shortly so to will the NE passage, via Siberia, open up. It's probably open now.

How many mega years ago this this dual event last happen? Even last year with the massive record breaking Arctic polar ice cap melt, this dual NW/NE passage opening didn't happen

We live in amazing, interesting and worrying times.

Greg
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dohboi
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PostPosted: Sat Aug 16, 2008 1:33 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

And the tail of the tape continues to show a persipitous drop.

still dropping

We seem to be ust barely above last year's coverage at this point, and dropping fast. Maybe it'll suddenly bounce back up, but there's a lot of thin ice out there. This gives a whole new planetary meaning to skating on thin ice.
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kiwichick
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PostPosted: Sat Aug 16, 2008 7:58 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

will the decrease in industrial output in china over the Games have any effect on the dimming effect?

like 9/11 did with planes grounded
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GregWatson
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PostPosted: Sat Aug 16, 2008 9:20 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/current.365.jpg

We seem to be about 200km^2 above last year and still dropping fast. There is a LOT of holey / patchy / feathery ice up there which may not last much longer. Last year the melt edges were much more solid.

Greg
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turmoil
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PostPosted: Sat Aug 16, 2008 11:30 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

GregWatson wrote:
There is a LOT of holey / patchy / feathery ice up there which may not last much longer.

Holey melting ice batman...

(couldn't resist)
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GregWatson
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PostPosted: Sun Aug 17, 2008 6:06 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/current.365.jpg

Down to 3.8 Million KM^2 and dropping. Nice hole starting to open up at the North pole.

Greg
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GregWatson
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PostPosted: Sun Aug 17, 2008 11:27 pm    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

http://arctic.atmos.uiuc.edu/cryosphere/NEWIMAGES/arctic.seaice.bandw.000.png

As of 17 August 2008 it looks like both the NW sea passage, via Canada and the NE sea passage via Siberia are doable.

When did this last happen?

Greg
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turmoil
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PostPosted: Mon Aug 18, 2008 12:50 am    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

GregWatson wrote:
When did this last happen?

I'd say even though we may not break the record, both passages opened is even more major since it didn't even happen last year (not to mention ever in recorded history). We are close enough to the record to indicate that the trend of ice loss is accelerating anyway.
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Tanada
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PostPosted: Mon Aug 18, 2008 5:05 am    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

If all that slushy 30% ice goes in the next few days we will meet last years record, if not freezing will soon equal melt just because of the time of the year. Either way 2008 is already the second lowest ice on record for the Arctic.

How people can look at this and say it means nothing is beyond my understanding.
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dorlomin
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PostPosted: Mon Aug 18, 2008 6:16 am    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

http://www.theregister.co.uk/2008/08/15/goddard_arctic_ice_mystery/

The Register has just published an article basicaly claiming that the NSIDC are fudging the graphs they publish. I notice they did not bother to ask the people who published the graph for an opinion or gave them an opertunity to respond.
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sjn
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PostPosted: Mon Aug 18, 2008 7:10 am    Post subject: Re: Record Ice Loss in Arctic 2008 Add User to Ignore List Reply with quote

dorlomin wrote:
http://www.theregister.co.uk/2008/08/15/goddard_arctic_ice_mystery/

The Register has just published an article basicaly claiming that the NSIDC are fudging the graphs they publish. I notice they did not bother to ask the people who published the graph for an opinion or gave them an opertunity to respond.

Quote:
The 30 per cent increase was calculated by counting pixels which contain colors representing ice. This is a conservative calculation, because of the map projection used. As the ice expands away from the pole, each new pixel represents a larger area - so the net effect is that the calculated 30 per cent increase is actually on the low side.
So they count all pixels as representing 100% ice, no matter whether that pixel actually represents 10%, 100% or somewhere in between. Then call that a conservative calculation!!! Rolling Eyes
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