Climate Change In Past 90000 Years Linked To Sea Ice

Posted: Aug 17 2016, 6:37am CDT | by , in News | Latest Science News


Climate Change in Past 90000 Years Linked to Sea Ice
The single celled algae, diatoms, can be seen using Scanning Electron Microscopy. It can take up to a year to clean a sample enough to be able to take a picture like this. Credit: Ulrike Hoff
  • Ice in the Sea implicated in 90,000 Years of Climate Change

Apparently, ice in the sea has been implicated in over 90,000 years of climate change.

The sea ice in the Arctic region seems to have shown a response to climate changes in the past. Throughout the frigid and icy ages of the past 90,000 odd years, the sea ice fringes took over the Greenland-Scotland region.

Also they went for some distance into the Atlantic Ocean. Sea ice tends to volumize the climate changes that are happening apace with the geological ones. The spread and meltdown of sea ice has a massive effect on the climate, the marine life forms and oceanic currents. 

The past extent of sea ice was studied by the researchers. The longest remaining record of sea ice in the form of a marine sediment core was the object of analysis for the scientists.

This was dredged up from a depth of 1200 meters in the Nordic Seas. This area was off the coast of the Faroe Islands. Basically, the core represents 90,000 years of evolution in the form of sedimentary rocks.

It is only via a thorough examination of these layers that the experts may get a  complete picture of the sea ice and past climatic changes that took place. 

The slightest shred of evidence regarding these layers would bring sea ice behavior into greater relief. A type of phytoplankton called diatoms are found everywhere in the waterways.

They are basically unicellular algae and their cell walls are made of silica. These go on to form the golden layer in a street lamp. Also they constitute the sparkling stuff in makeup items.

Even ordinary toothpaste contains them in the form of cleaning components. They are a source of fascination for marine biologists.

They have been found preserved in marine sediments that are millions of years old. Even those that go back to 65 million years in the past are similar to their modern counterparts.   

The diatoms could aid us in our gauging of the sea ice and climate change. The sea ice retreated suddenly during warmer times. It also spread quickly during colder times.

A small number of diatoms made the sea ice as their habitat. They employed the sun’s rays for sustenance. Via a classification of the diatoms in the sea ice, the thickness of the ice layer could be calculated.

As soon as diatoms die, they dissolve in the water. Yet even in dying and sinking to the bottom of the ocean, they release a lipid called IP25. This does not dissolve readily. It was the traces of this special lipid that were used by scientists to study the sea ice and climate change equation even further.

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The Author

<a href="/latest_stories/all/all/20" rel="author">Sumayah Aamir</a>
Sumayah Aamir (Google+) has deep experience in analyzing the latest trends.




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