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Rainfall Pattern Changing Across Globe: Study

Rainfall pattern changing across globe, India not left out

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The rainfall pattern across the globe is changing due to rapid warming of the Indo-Pacific Ocean. Pixabay

The rainfall pattern across the globe is changing due to rapid warming of the Indo-Pacific Ocean and the changes have brought a decline in rainfall pattern in north India too, a study said on Wednesday.

In the study, led by Roxy Mathew Koll of the Indian Institute of Tropical Meteorology, Pune, under the Ministry of Earth Sciences, and published in the journal Nature, the researchers report a twofold expansion of the Indo-Pacific warm pool — the largest expanse of the warmest ocean temperatures on the earth.

They find that the expansion of this warm pool has altered the most dominant mode of weather fluctuation originating in the tropics, known as the Madden Julian Oscillation (MJO).

The changes in the MJO behaviour have increased the rainfall over northern Australia, west Pacific, the Amazon basin, southwest Africa and southeast Asia (Indonesia, the Philippines and Papua New Guinea).

At the same time these changes have brought a decline in rainfall over central Pacific, along the west and east coast of the US (eg, California), north India, east Africa, and the Yangtze basin in China.

Over north India, the impact is reduction of rainfall during the winter-spring season (November-April).

Rainfall pattern across globe
The changes in the MJO behaviour leads to a fluctuation in the rainfall pattern across the globe. Pixabay

The MJO, characterised by a band of rain clouds moving eastward over the tropics, regulates tropical cyclones, the monsoons, and the El Nino cycle — and occasionally contributes to severe weather events over Asia, Australia, Africa, Europe and the Americas.

The MJO travels for a stretch of 12,000-20,000 kms over the tropical oceans, mainly over the Indo-Pacific warm pool, which has ocean temperatures generally warmer than 28 degrees Celsius.

This Indo-Pacific warm pool has been warming rapidly and expanding during the recent decades in response to increasing carbon emissions.

Though the entire Indo-Pacific has warmed, the warmest waters are over the west Pacific, creating a temperature contrast that drives moisture from the Indian Ocean to the west Pacific Maritime Continent, enhancing the cloud formation there.

As a result, the lifecycle of MJO has changed. The residence time of MJO clouds have shortened over the Indian Ocean by four days (from an average of 19 days to 15 days).

Over the west Pacific, it increased by five days (from an average of 16 days to 23 days). It is this change in the residence time of MJO clouds that has altered the weather patterns across the globe.

Also Read- Marine Animals Can Help Humans Monitor Oceans: Study

“There are coordinated international efforts underway to extend the range of accurate weather forecasts out to lead times of two to four weeks and the MJO is one of the most important keys to the success of this enterprise,” said Michael McPhaden, Senior Scientist at the US National Oceanic and Atmospheric Administration (NOAA), who participated in the study.

“Our results provide a critical benchmark for determining which computer models to trust for extended range weather forecasting, based on their ability to simulate the observed behavior of the MJO in a changing climate,” he added. (IANS)

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Flipkart Brings First Nokia-branded Smart TV in India: Report

The visuals of the TV are bolstered with "MEMC" technology, which eliminates blurs and judders for a screen shift devoid of lags, thus, offering better picture definition

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Flipkart Buys Back Shares Worth $350 mn.
New e-commerce norms to impact e-tailers: Flipkart. IANS

Flipkart on Thursday launched the Nokia Smart TV in India as part of their strategic partnership. Priced at Rs 41,999, the Nokia-branded smart TV is currently available in a 55-inch variant and features “Sound by JBL”.

The smart TV will be available on the e-commerce platform starting December 10 and the firm will expand the line up of 4K variants in the coming months.

“The acoustics of the Nokia Smart TV has been engineered by JBL, which will let customers experience clear vocal tones and minimal harmonic distortion. True to JBL’s brand recall, the Nokia Smart TV will also enjoy deep bass tones, typically popular with Indian audiences,” the company said in a statement.

Notably, this is the first time that JBL is extending its audio expertise in television space in India.

The TV is powered by 24 watt built-in speakers, “DTS TruSurround” and Dolby Audio to enhance the overall audio experience.

Flipkart will provide complete TV protection for Nokia-branded smart TVs, which is available at a launch price of Rs 999.

Flipkart, Nokia
Flipkart earlier entered into a strategic partnership with Nokia to launch Nokia smart TVs in India. Wikimedia Commons

The programme gives consumers a coverage of three years against manufacturing defects and accidental damages, along with a guaranteed buyback value at the end of three years.

The Nokia Smart TV offers intelligent dimming that helps produce deeper blacks through accurate backlight control and a wide colour gamut.

It comes with the Android 9.0 Operating System (OS) that will allow users access a host of apps on the Android TV Play Store.

Also Read: Sony Unveils Alpha 9 II Camera in India for Rs 3,99,990

It sports a quad-core processor and 2.25GB RAM and 16GB ROM.

The visuals of the TV are bolstered with “MEMC” technology, which eliminates blurs and judders for a screen shift devoid of lags, thus, offering better picture definition. (IANS)