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Pacific depths still cooling due to 'Little Ice Age'


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  • The title was changed to Pacific depths still cooling due to 'Little Ice Age'
 

Im not sure if i buy thier logic. So the temperatures are lagging down there and take hundreds of years to catch up to the surface? Who was down there monitoring the temperature changes of different depths 700 years ago?

Edited by Nnicolette
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2 hours ago, Nnicolette said:

Im not sure if i buy thier logic. So the temperatures are lagging down there and take hundreds of years to catch up to the surface? Who was down there monitoring the temperature changes of different depths 700 years ago?

The HMS Challenger, a three-masted wooden sailing ship originally designed as a British warship, was used for the first modern scientific expedition to explore the world's ocean and seafloor. During the expedition from 1872 to 1876, thermometers were lowered into the ocean depths and more than 5,000 temperature measurements were logged.

"We screened this historical data for outliers and considered a variety of corrections associated with pressure effects on the thermometer and stretching of the hemp rope used for lowering thermometers," said Huybers.

The researchers then compared the HMS Challenger data to the modern observations and found warming in most parts of the global ocean, as would be expected due to the warming planet over the 20th Century, but cooling in the deep Pacific at a depth of around two kilometers.

"The close correspondence between the predictions and observed trends gave us confidence that this is a real phenomenon," said Gebbie.



https://www.sciencedaily.com/releases/2019/01/190104121426.htm

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19 hours ago, Essan said:

Thank you good relevant info. Still no mention of how they came to the conclusion that the cooling is caused by a little ice age 700 years ago. Is that the only reason the depths could cool? Or is there less sunlight getting down because the waters murky? Thats just a random idea but who decided that the water "remembers" what happened 700 years ago as the article put it. They made it sound silly.

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2 hours ago, Nnicolette said:

Thank you good relevant info. Still no mention of how they came to the conclusion that the cooling is caused by a little ice age 700 years ago. Is that the only reason the depths could cool? Or is there less sunlight getting down because the waters murky? Thats just a random idea but who decided that the water "remembers" what happened 700 years ago as the article put it. They made it sound silly.

You take the temperature of newly-formed deep water in places like the North Atlantic as the current temperature.  Then just measure the temperature in different currents on the ocean bottoms.  The temps between the places where deep water is formed and those where it rises back to the surface are a record of past surface temps.  The speed of the currents tells you how long along the deep water was formed.

Doug

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