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Author Topic: Arctic Café  (Read 301109 times)

Tor Bejnar

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Re: Arctic Café
« Reply #900 on: June 12, 2017, 07:53:01 PM »
How the Arctic Ocean became saline

Researchers model climate changes caused by the submersion of the Greenland-Scotland Ridge

Date:June 6, 2017
Source:Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research
Summary:The Arctic Ocean was once a gigantic freshwater lake. Only after the land bridge between Greenland and Scotland had submerged far enough did vast quantities of salt water pour in from the Atlantic.

The Arctic Ocean was once a gigantic freshwater lake. Only after the land bridge between Greenland and Scotland had submerged far enough did vast quantities of salt water pour in from the Atlantic. With the help of a climate model, researchers from the Alfred Wegener Institute have demonstrated how this process took place, allowing us for the first time to understand more accurately how Atlantic circulation, as we know it today came about. The results of the study have now been published in the journal Nature Communications.

Every year, ca. 3,300 cubic kilometres of fresh water flows into the Arctic Ocean. This is equivalent to ten percent of the total volume of water that all the world's rivers transport to the oceans per year. In the warm and humid climate of the Eocene (ca. 56 to 34 million years ago), the inflow of freshwater was probably even greater. However, in contrast to today, during that geological period there was no exchange of water with other oceans. The influx of saline Atlantic and Pacific water, which today finds its way into the Arctic Ocean from the Pacific via the Bering Strait and from the North Atlantic via the Greenland-Scotland Ridge, wasn't possible -- the region that is today completely submerged was above the sea at that time.

But did the "Arctic Really Great Lake" ever freeze? (from Wikipedia):
The Eocene Epoch contained a wide variety of different climate conditions that includes the warmest climate in the Cenozoic Era and ends in an icehouse climate. The evolution of the Eocene climate began with warming after the end of the Palaeocene-Eocene Thermal Maximum (PETM) at 56 million years ago to a maximum during the Eocene Optimum at around 49 million years ago. During this period of time, little to no ice was present on Earth with a smaller difference in temperature from the equator to the poles. Following the maximum was a descent into an icehouse climate from the Eocene Optimum to the Eocene-Oligocene transition at 34 million years ago. During this decrease ice began to reappear at the poles, and the Eocene-Oligocene transition is the period of time where the Antarctic ice sheet began to rapidly expand.

But when did it go from freshwater "Lake" to salty "Ocean"?   The Middle Eocene Arctic was dominated by freshwater (from Early to middle Eocene history of the Arctic Ocean from Nd-Sr isotopes in fossil fish debris, Lomonosov Ridge, 2009), although
Evidence of intermittent exchange between the Arctic and adjacent oceans is also preserved in the deeper water (Nd) isotope signature of the fish debris, although limited connections during the Eocene probably restricted this exchange. We conclude that an active year-round Arctic hydrologic cycle, along with eustatic and tectonic controls on oceanic exchange, must have exerted significant control on the evolution of Eocene Arctic Ocean water column structure and the isotopic composition of early and middle Eocene fish debris reported on here.

The 50 Ma paleoreconstruction of the early Eocene Arctic Ocean Basin showing position of IODP 302 drill sites (modified from Expedition 302 Scientists [2005]). Possible shallow marine connections existed between the Arctic and Tethys (via western Siberian Seaway/Turgay Strait), North Atlantic (via the Norwegian-Greenland Sea and the Labrador Sea), and the Pacific Ocean (via proto-Bering Strait). NA, North America; A, Asia/Siberia; Gr, Greenland; E, Europe. Middle Eocene connections are uncertain, and exchange with Tethys may have ceased by early middle Eocene time

Arctic ice is healthy for children and other living things.


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Re: Arctic Café
« Reply #901 on: June 18, 2017, 11:39:10 AM »
Re IJIS thread - why is polluted with non IJIS related speculation?

Re contrarian betting :
Big boys make seriously big money betting contrarianingly. They only bet contrarianingly when they have insider info or they themselves helped manufacture the wild swing to one side of true value. They never bet unknowingly.
Small boys who bet contrarianingly on the wild hope of getting rich loose their shirt long before they wipe their arses with 100$ bills.
If most of the mpst knowledgeable people on this forum are very fearful for the state of the ice in September, better not to risk betting that we'll be running adventure marathons to the pole...


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Re: Arctic Café
« Reply #902 on: June 19, 2017, 06:30:41 PM »

Climate scientists seeking opinion of stupid idiot to complete study

OTTAWA – Scientists are nearing completion on another planet-wide study on climate change, but say they require the opinion of a “real stupid idiot” in order to complete their work.

“We’ve spent months conducting research and analyzing the data,” explained Dr. Naomi Prashad. “So we’re nearly there. We just need the assistance of a total brow-furrowing goddamn dolt to point out any shortcomings in our work.”


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Re: Arctic Café
« Reply #903 on: June 21, 2017, 03:42:52 AM »
For a break and sailing off into the past, all the way to 1906 in the Arctic - before it becomes officialy open source   -

REPORT ON THE DOMINION GOVERNMENT EXPEDITION TO HUDSON BAY AND THE ARCTIC ISLANDS ON BOARD THE D. G. S. NEPTUNE [The Cruise of the Neptune] [Recovered for PP] (1906)       is available for "Smooth Reading."   

.epub, .html, pdf, .txt, etc. are available at the Smooth Reading page for Distributed Proofreaders Canada

You might need to sign up to download it.  Or you can wait a few weeks or months and get it when done at after it finishes post processing. It will also go to Gutenberg.  Only small request is to contact them if you see typos. 

peace out. 


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Re: Arctic Café
« Reply #904 on: June 23, 2017, 11:33:43 PM »
Jimmy Dore exercises elementary natural humanistic logic, how one can not love him.


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Re: Arctic Café
« Reply #905 on: June 24, 2017, 01:27:14 PM »
The Jimmy Dore Show was in a bit of a slump recently, with Dore incessantly ranting about the same things (and cursing even more than usual). His ego played up a little as well. And it was less funny. It has to be funny, that's crucial. Not just for the viewers, but also for Dore's team, because it's really difficult to do things if you don't get some fun or satisfaction out of it.

I've been watching some videos from the past days, and it's really good stuff again.
Il faut cultiver notre jardin


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Re: Arctic Café
« Reply #906 on: June 26, 2017, 07:26:44 AM »
This might be of some use in some threads, the friendly big red button:
A quantity relates to a quantum like camel's back relates to camel's _______ ? (back, vertebra, vertebral tendon, spinal disc, paralysis)