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Mysterious ‘shadow zone’ in the Pacific Ocean traps 2000-year-old water


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2017 Nov 19, 6:36am   1,980 views  5 comments

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The “shadow zone” and it lies around two kilometres below the surface in an ocean abyss where trapped water dates back to the fourth century.

This ancient water, which is between 1000 and 2000 years old, dates back to when the ancient Germanic tribe the Goths instigated the end of the Western Roman Empire and the rise of Medieval Europe.

Lying in a 6000km by 2000km patch of the North Pacific Ocean between 1km and 2.5km below the surface, the shadow zone’s reason for existence has remained a mystery until now.

Carbon dating identified its age and location some time ago, but scientists struggled to understand why the stagnant zone lay where it did.

An international team led by the University of NSW has now established that the zone is prevented from circulating up to make contact with the atmosphere by the shape of the sea floor.

The UNSW School of Mathematics and Statistics’ Dr Casimir de Lavergne is the lead author of a research paper about the zone, published in the latest edition of the scientific journal Nature.

“Abyssal ocean overturning shaped by sea floor distribution” explains that the zone has barely any vertical movement because factors prevent it from rising.





The zone lies between rising currents caused by the rough topography and geothermal heat sources below 2.5km and the shallower wind driven currents closer to the surface.

“When this isolated shadow zone traps millennia old ocean water it also traps nutrients and carbon which have a direct impact on the capacity of the ocean to modify climate over centennial timescales,” said the paper’s fellow author Dr Fabien Roquet of Stockholm University.



More: http://www.news.com.au/technology/environment/natural-wonders/mysterious-shadow-zone-traps-2000yearold-water/news-story/0c114ea8db03eea15c22e71e16a2688d

Also at: https://phys.org/news/2017-11-shadow-zone-world-oldest-ocean.html

#SciTech #Environment #Oceans

Comments 1 - 5 of 5        Search these comments

1   anonymous   2017 Nov 19, 6:57am  

What kind of carbon junk did they find in the water to date?
2   HEY YOU   2017 Nov 19, 11:11am  

This is an emergency! We need to get out there & pollute!
.......

https://www.reuters.com/article/us-usa-lead-map/reuters-finds-3810-u-s-areas-with-lead-poisoning-double-flints-idUSKBN1DE1H2
I'm joining the Republican Party because that would make me,my family & friends(Note:I have none.) immune to all forms of pollution & environmental degradation.
3   Y   2017 Nov 19, 12:33pm  

Whatever they find I think they should tax it.
anon_61c8a says
What kind of carbon junk did they find in the water to date?
4   anonymous   2017 Nov 19, 12:57pm  

BlueSardine says
Whatever they find I think they should tax it.


Yes, anything to help pay for Trumps tax cuts for the rich
5   Ceffer   2017 Nov 19, 2:54pm  

Sink a tanker of Viagra into it and it will erupt into enormous watery priapism.

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