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Indian Ocean Warming leads to change in the Rainfall Pattern and Groundwater Storage in India

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Kolkata, Jan 10, 2017:  The changing rainfall pattern, which is linked to the warming of the Indian Ocean, is the key factor driving changes in groundwater storage in India. This is reported by a new study led by the Indian Institute of Technology (IIT) in Gandhinagar.

Published in the journal Nature Geoscience in January, the study shows that changing monsoon patterns “which are tied to higher temperatures in the Indian Ocean” are an “even greater driver of change” in groundwater storage than the pumping of groundwater for agriculture.

“Groundwater plays a vital role in food and water security in India. Sustainable use of groundwater resources for irrigation is the key for future food grain production,” said study leader Vimal Mishra, of IIT Gandhinagar. “And with a fast-growing population, managing groundwater sustainability is becoming even more important.

The linkage between monsoon rainfall and groundwater can suggest ways to enhance groundwater recharge in India and especially in the regions where rainfall has been declining, such as the Indo-Gangetic Plain,” he added. Groundwater withdrawals in the country have increased over ten-fold since the 1950s, from 10-20 cubic kms per year in 1950 to 240-260 cubic kms per year in 2009. And satellite measurements have shown major decline in groundwater storage in some parts of the country, particularly in northern India, the study notes.

“This study adds another dimension to the existing water management framework. We need to consider not just the withdrawals, but also the deposits in the system,” said Yoshihide Wada, co-author and the deputy director of the Water programme at the International Institute for Applied Systems Analysis in Austria.

By looking at water levels in wells around the country, the researchers could track groundwater replenishment following the monsoon. In addition, the researchers found that the monsoon precipitation is correlated with Indian Ocean temperature, a finding which could potentially help to improve precipitation forecasts and aid in water resource planning.

“Weather is uncertain by nature, and the impacts of climate change are extremely difficult to predict at a regional level. But our research suggests that we must focus more attention on this side of the equation if we want to sustain manage water resources for the future”, Wada added. (IANS)

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Japan Sees Unexpected Cherry Blossoms

Japan was this year hit by a series of typhoons

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Cherry blossoms bloom unexpectedly in Japan. Flickr

Some of Japan’s famed cherry blossoms, also known as sakura, have bloomed unexpectedly this autumn, according to weather experts.

The famous pink and white flowers are typically visible for about two weeks in the spring – a phenomenon tourists from around the world come to witness, the BBC reported.

But more than 300 people have reported cherry blossoms in their neighbourhood in October, according to meteorological company Weathernews.

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Sakura Flowers. Flickr

The experts have said a series of typhoons could have contributed to the phenomenon.

“This has happened in the past, but I don’t remember seeing something of this scale,” Hiroyuki Wada, a tree doctor at the Flower Association of Japan told public broadcaster NHK on Thursday.

Japan was this year hit by a series of typhoons, including Typhoon Jebi – the strongest storm to hit the country in a quarter of a century.

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Typhoon Jebi killed at least 10 people and caused widespread destruction.

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