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Post by sigurdur on Jul 22, 2014 14:50:26 GMT
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Post by neilhamp on Jul 23, 2014 6:27:54 GMT
looks like the sailing boats aren't going to try anything silly How long will they wait?
"This is the start of the intricate part of the Northwest Passage, much of which is still choked by ice at this time of year and thus not navigable. However, with the arrival of summer, the ice starts its brief retreat making it possible to negotiate these challenging waters. To be able to take prompt advantage of an improvement in the ice situation, we shall anchor in one of the protected bays on the south coast of Devon Island, to be ready to go as soon as conditions are favourable. Based on the record of previous years, this can happen in early August."
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Post by Ratty on Jul 23, 2014 7:40:16 GMT
Thanks Sig & everyone. I found this page too: Data: TerminologyThanks for your patience and for pointing me in the right direction; I will likely be annoying you more often in future because I've had sudden, catastrophic hearing loss in my right ear and associated balance problems. So, I will probably be spending a little more time sitting and reading. PS: I still find it a little confusing .....
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Post by cuttydyer on Jul 27, 2014 7:14:08 GMT
Blue Planet Odyssey update: both vessels are anchored in Dundas Harbour on the South side of Devon Island - awaiting for the ice ahead of them to clear...
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Post by flearider on Jul 27, 2014 11:22:19 GMT
there going to be a while then ...lol
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Post by sigurdur on Jul 27, 2014 15:38:21 GMT
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Post by sigurdur on Jul 27, 2014 15:47:53 GMT
there going to be a while then ...lol Doesn't look like the NW Passage is going to open this year. At least they have the good sense to use the tools available to them so they don't get crushed in the pack ice. Seems that some folks with PHD's behind their name lack that ability. Example, down south last year. Still chuckle over that one.
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Post by sigurdur on Jul 27, 2014 16:41:04 GMT
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Post by nautonnier on Jul 27, 2014 17:46:43 GMT
Could try watching planks warp Although they may have stumbled on the reason for the increased ice. Perhaps like a watched pot never boils - watched ice never melts?
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Post by douglavers on Jul 27, 2014 21:40:05 GMT
Fascinating article, Sigurdur.
I think the researchers might really learn something. I particularly liked the bit "they want the confirmatory fine detail". They better be prepared for a few surprises - I think this was an excellent year for them to start researching!!!
"The Arctic summer ice is an example of positive feedback. Ice reflects sunlight, so it is its own insulator, and keeps itself cold. But as it melts and retreats, the exposed darker ocean waters can absorb more radiation, and bring more warmth to the edges of the retreating ice, thus accelerating the process.
It freezes again, but – on average – each year the ice cap becomes thinner, and the total area frozen continues to shrink. Researchers think they understand the big picture, but now they want the confirmatory fine detail."
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Post by sigurdur on Jul 27, 2014 21:57:23 GMT
The bigger question becomes what phase of the Arctic Cycle are we in? Presently we are about 450,000 sq kilometers above the long term mean in regards to World sea ice.
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Post by nautonnier on Jul 27, 2014 22:35:27 GMT
Fascinating article, Sigurdur. I think the researchers might really learn something. I particularly liked the bit "they want the confirmatory fine detail". They better be prepared for a few surprises - I think this was an excellent year for them to start researching!!! "The Arctic summer ice is an example of positive feedback. Ice reflects sunlight, so it is its own insulator, and keeps itself cold. But as it melts and retreats, the exposed darker ocean waters can absorb more radiation, and bring more warmth to the edges of the retreating ice, thus accelerating the process. It freezes again, but – on average – each year the ice cap becomes thinner, and the total area frozen continues to shrink. Researchers think they understand the big picture, but now they want the confirmatory fine detail." "But as it melts and retreats, the exposed darker ocean waters can absorb more radiation"Not quite The angle of isolation in the arctic is so acute that not only is the sun's energy spread over a much larger area and the sunlight is mainly reflected/refracted and almost no sunlight penetrates to any depth. Indeed some say that the water at that angle of insolation is as reflective as ice.
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Post by magellan on Jul 28, 2014 0:00:02 GMT
Where's Graywolf when you really want to read some mindless babble.
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Post by douglavers on Jul 28, 2014 1:27:55 GMT
Nautonnier, please correct me if I am wrong here.
With insolation, I think the rippled surface of water would always enjoy a relatively high proportion of high incident angle radiation, which would be absorbed. Hence reflection would be less effective. The crical angle for total reflection would be important here.
Ice/snow, on the other hand, would presumably always reflect a high proportion of the incident radiation.
This would be an interesting research topic!
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Post by sigurdur on Jul 28, 2014 1:33:00 GMT
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