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Cave deposits throw light on monsoon pattern

16 February 2011

Do you know that cave deposits provide vital information on how the Southwest Monsoon behaved several thousand years ago?

That is what was found out by scientists from the National Geophysical Research Institute (NGRI) by studying oxygen isotopes of the white or light brownish structures (stalagmites) found in different shapes and sizes in caves. Stalagmites are made of calcium carbonate accumulated over eons.

Led by Syed Masood Ahmad, head of paleo-climatology wing, the scientists examined the monsoon pattern for 1,000 years from 14,700 years to 15,700 years Before Present (BP). By studying oxygen isotopes of stalagmites from Valmiki caves, Kurnool district in Andhra Pradesh, they found that there were periods of intense monsoon and droughts in a cyclical fashion. The monsoon became more intense every 50, 80 and 200 years because of ocean atmospheric changes, Dr. Ahmad told The Hindu here on Tuesday…..

Read more: http://www.thehindu.com/sci-tech/energy-and-environment/article1458848.ece

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Written by csirindia

February 16, 2011 at 9:59 am

Posted in NGRI

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