Antarctic Ice Sheet Started to Melt 5,000 Years Earlier Than Previously Believed

Antarctic ice sheet started to shrink at the end of the last ice age, 5,000 years before previously believed, and has been shrinking during eight distinct episodes which led to rapid sea level rise, a new study reveals.

Researchers at University of Cologne, Oregon State University, the Alfred-Wegener-Institute, University of Hawaii at Manoa, University of Lapland, University of New South Wales, and University of Bonn, examined two sediment cores from the Scotia Sea between Antarctica and South America that contained "iceberg-rafted debris" that had been scraped off Antarctica by moving ice and deposited via icebergs into the sea.

Health Effects of Global Warming/What is Global Warming?
Greenhouse effect causes excessive heat to build up in the earth’s atmosphere causing global warming and affects the environment and health.

As the icebergs melted, they dropped the minerals into the seafloor sediments, giving scientists a glimpse at the past behavior of the Antarctic Ice Sheet.

Periods of rapid increases in iceberg-rafted debris suggest that more icebergs were being released by the Antarctic Ice Sheet. The researchers discovered increased amounts of debris during eight separate episodes beginning as early as 20,000 years ago, and continuing until 9,000 years ago.

The melting of the Antarctic Ice Sheet wasn't thought to have started, however, until 14,000 years ago.

Air Conditioner Health Hazards
This section gives a brief introduction about what air conditioner health hazard means and what kind of people get affected by it, and what causes them.

"Conventional thinking based on past research is that the Antarctic Ice Sheet has been relatively stable since the last ice age, that it began to melt relatively late during the deglaciation process, and that its decline was slow and steady until it reached its present size," said lead author Michael Weber, a scientist from the University of Cologne in Germany.

"The sediment record suggests a different pattern - one that is more episodic and suggests that parts of the ice sheet repeatedly became unstable during the last deglaciation," Weber added.

Stop Global Warming By Purchasing a "green Home"
In these times of global warming, buying a green home might be the best bet, an example of which is the Cliffs Cottage at Furman University in the US.

According to co-author Axel Timmermann, a climate researcher at the University of Hawaii at Manoa, the researchers suspect that a feedback mechanism may have accelerated the melting, possibly by changing ocean circulation that brought warmer water to the Antarctic subsurface.

The study has been published in the journal Nature.

Source-ANI