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Post by sigurdur on Mar 16, 2016 1:42:03 GMT
Should this topic be renamed "Fire & Ice" ...... Well, according to some, if the ice disappears we will be in flames. So.....maybe?
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Post by sigurdur on Mar 16, 2016 2:31:10 GMT
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Post by Ratty on Mar 16, 2016 23:21:22 GMT
Couldn't help but notice a mention of sea level rise in the article. Did I miss something or is the "2,000-square-mile block" floating ice?
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Post by sigurdur on Mar 17, 2016 0:31:40 GMT
Couldn't help but notice a mention of sea level rise in the article. Did I miss something or is the "2,000-square-mile block" floating ice? Naw, you didn't miss anything. Have to get the "sea levels are rising" meme in ya know? Even tho sea ice melt actually lowers sea levels in theory because it floats. Maybe the kid never has had ice in a drink?
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Post by nautonnier on Mar 17, 2016 9:04:24 GMT
Couldn't help but notice a mention of sea level rise in the article. Did I miss something or is the "2,000-square-mile block" floating ice? Naw, you didn't miss anything. Have to get the "sea levels are rising" meme in ya know? Even tho sea ice melt actually lowers sea levels in theory because it floats. Maybe the kid never has had ice in a drink? This discussion of sea level rise reminds me of the old: "Optimists say the glass is half full, pessimists say the glass is half empty, engineers say the glass is too big"The assumption of sea level rise being solely due to ice melting is that the ocean basins are static size and nothing changes. This is a false assumption - as the paper referenced here states Ice doesn't control sea level rise the mantle does There is possibly a cross over point in glaciations where many cubic kilometers of ice covered the continents, but the millimetric rise could easily be due to the mantle changes. You might think that we are on solid ground but the Earth's crust is only around 2 thousandths of the diameter of the Earth and in the ocean it is often less than that at 5 - 10km thick. So the basins are not 'rock solid' and the glass may be getting smaller.
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Post by graywolf on Mar 18, 2016 10:35:51 GMT
That is a teeny weeny blob of ice in Bering? Hows about these slabs; worldview.earthdata.nasa.gov/?p=arctic&l=VIIRS_SNPP_CorrectedReflectance_TrueColor(hidden),MODIS_Aqua_CorrectedReflectance_TrueColor(hidden),MODIS_Terra_CorrectedReflectance_TrueColor,Reference_Labels(hidden),Reference_Features(hidden),Coastlines&t=2016-03-10&v=-2902016,-719872,-104448,584704 This is Beaufort in spin mode! If you pan up and left you'll find the ickle chunk that caused such a stir in the Article...... As for sea level rise? Let's be minful that the impacts from an ice free, as opposed to ice covered, Ocean extends 1,000km inland so this early break up in Beaufort will lead to early ice free coastal strip and so increase melt over Greenland which does raise sea level
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Post by nautonnier on Mar 18, 2016 12:32:18 GMT
That is a teeny weeny blob of ice in Bering? Hows about these slabs; worldview.earthdata.nasa.gov/?p=arctic&l=VIIRS_SNPP_CorrectedReflectance_TrueColor(hidden),MODIS_Aqua_CorrectedReflectance_TrueColor(hidden),MODIS_Terra_CorrectedReflectance_TrueColor,Reference_Labels(hidden),Reference_Features(hidden),Coastlines&t=2016-03-10&v=-2902016,-719872,-104448,584704 This is Beaufort in spin mode! If you pan up and left you'll find the ickle chunk that caused such a stir in the Article...... As for sea level rise? Let's be minful that the impacts from an ice free, as opposed to ice covered, Ocean extends 1,000km inland so this early break up in Beaufort will lead to early ice free coastal strip and so increase melt over Greenland which does raise sea level It won't melt to anywhere the level of melt it was in the medieval warm period. There are many places in UK that show how far the sea level dropped in the Little Ice Age. Castles and buildings that used to be on the shore line now miles inland. So there is a long way to go before sea levels recover to where they were then. Oh but I forgot; the ideal sea level is what it was in ( cherry pick a suitable date)
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Post by graywolf on Mar 18, 2016 12:56:47 GMT
The Uk is still undergoing isostatic rejuvenation ( in the NW) and sinking ( in the SE) from the last glaciation? so whilst we have raised beaches and raised inlets in the far NW we have plenty of 'drowned villages' in the SE.
All the Paleo shows that the Arctic Basin has not see widespread open waters since the climate optimum, from the last glaciation, over 7,000 yrs ago? In fact in 2012 we found Pacific diatoms in the N.Atlantic where they had been absent for 75,000 yrs!!! so current events across the Arctic are unprecedented.
Meanwhile, back to the ice. Another drop in IJIS extent so even further away from the prelim max in late Feb? I think it is all over now as Okhotsk, and its out of Basin extent, is just about to meet with Spring temps?( and Bering too?) We also see a strong di-pole set up on the Atlantic side of the basin so all the ice over Fram is also at risk?
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Post by sigurdur on Mar 18, 2016 17:17:27 GMT
Unless something changes soon, it will be a low ice extent minimum in the Arctic.
A boom for mankind, and one can only hope the trend continues.
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Post by graywolf on Mar 18, 2016 18:15:31 GMT
I think we'll agree to differ on the impacts of a 'near ice free' Arctic Ocean. The impacts will be instant and cumulative but the impacts will impact the developed world as well as developing nations ( some by default!).
The impacts on Greenland may well be the worse we have to face but recent discoveries of giant gas blowouts around the basin, that formed 11,700 yrs ago, we have to wonder about just how this 'novel' re-juvination of warming will bring esp. when the E.S.S. is showing 'chimney' features that grow from metres across to 1km, across over a single year, it already appears we are setting up for round 2?
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Post by acidohm on Mar 18, 2016 19:00:15 GMT
What is E.S.S Graywolf???
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Post by graywolf on Mar 19, 2016 10:00:03 GMT
East Siberian Sea. During the last ice age this region was not glaciated but similar grasslands to what we see today. Rising Sea levels then drowned the permafrost under a shallow shelf sea (E.S.S.). In 2010 a Russian funded expedition noted CH4 'seeps' making it all the way to the surface. These 'seeps' formed 'chimney' like features. In Aug 2012, when cargo capt.s were reporting 'boiling oceans' across the E.S.S., the team found that these 'chimneys' had grown. In some cases to approaching 1km across.
Recent finds around the basin have seen 'craters' , about 1km across, dated to 11,700 years ago. The understanding is that on emergence from the last glaciation the CH4 became unstable in the sediments and erupted ( similat to the Yamal craters but much larger?).
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Post by sigurdur on Mar 19, 2016 18:28:19 GMT
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Earthling
New Member
Happy, warm and comfortable
Posts: 3
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Post by Earthling on Mar 20, 2016 11:33:12 GMT
The Uk is still undergoing isostatic rejuvenation ( in the NW) and sinking ( in the SE) from the last glaciation? so whilst we have raised beaches and raised inlets in the far NW we have plenty of 'drowned villages' in the SE. I was born in SE England in 1941. I'd be grateful if you could tell me more about the 'drowned villages' there specifically caused by climate change since the ice age? Thanks.
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Post by acidohm on Mar 20, 2016 11:34:44 GMT
The Uk is still undergoing isostatic rejuvenation ( in the NW) and sinking ( in the SE) from the last glaciation? so whilst we have raised beaches and raised inlets in the far NW we have plenty of 'drowned villages' in the SE. I was born in SE England in 1941. I'd be grateful if you could tell me more about the 'drowned villages' there specifically caused by climate change since the ice age? Thanks. I think maybe coastal erosion is more the issue there....
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