UPSC Courses

DNA banner


  • 28 November, 2019

  • Min Read

Global warming alters rainfall pattern

Syllabus subtopic: Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc., geographical features and their location- changes in critical geographical features (including water-bodies and ice-caps) and in flora and fauna and the effects of such changes.

News: Global warming has altered a key weather system and that may be whetting cyclones in the Bay of Bengal, decreasing winter rain in north India and altering global rainfall patterns, a study by a team of Indian and U.S. researchers has found.

Prelims and Mains focus: key findings of the study, Madden-Julian Oscillation (MJO) and its effects on the climate

Key findings of the study

  • To compute the reduction in the number of MJO days over the Indian Ocean, the researchers — they included scientists from the U.S. National Oceanic and Atmospheric Administration (NOAA), the University of Washington and the University of Tokyo — compared ocean temperatures from 1981­2018 to compute the changes.

  • Global warming has been expanding the size of the warm pool on average by 2,300 sq. km. annually from 1900­2018 and at an accelerated average rate of 4,000 sq. km. per year during 1981–2018.

  • The changes in MJO behaviour have increased the rainfall over northern Australia, west Pacific, Amazon basin, southwest Africa and southeast Asia (Indonesia, 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 U.S. (e.g., California), north India, east Africa and the Yangtze basin in China. The frequent California fires, droughts in Africa and East Asian floods and cyclones in the Bay of Bengal may be linked to these changes in global weather, the study noted.

About Madden-Julian Oscillation (MJO)

  • It is a moving band of rain clouds that travels around the globe spanning 12,000–20,000 km across the tropical oceans.

  • In its journey, it interacts with surface waters of the Indo-Pacific ocean, the largest pool of warm water in the globe, and due to this — the authors say — the lifecycle of the MJO gets affected.

  • The MJO clouds on average are spending only 15 days, instead of 19, over the Indian Ocean. Over the west Pacific, it increased by five days (from an average 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, according to the research paper that appears in the latest edition of the journal Nature.

MJO’s impact on India’s climate

  • When the MJO appears in the Indian Ocean during the monsoon months of June-September, it can increase rains over India.

  • This year, India was poised to receive below normal monsoon rainfall in April but ended up with excessive rain partly due to the MJO.

  • The change in the MJO could drift warmer surface water towards the Bay of Bengal and increase cyclones.

  • “The MJOs haven’t been as extensively studied as say the El Nino. This study shows that we need better observation of the Indian Ocean and improve forecasts that can warn us about a cyclone.”


Way forward

The MJOs haven’t been as extensively studied as say the El Nino. This study shows that we need better observation of the Indian Ocean and improve forecasts that can warn us about a cyclone.

Source: The Hindu

What is Mission Indradhanush ?

Mission Indradhanush was launched in 2014 under the Ministry of Health and Family Welfare.  1. Between 2009 - 2013, only 1% coverage per year has increased. We have to make it to 5%. 2. Objectives of Mission Indradhanush: We have the aim of full coverage by 2020. Cover all those children who are either unvaccinated or are part

Mediation Bill 2021 - Detailed Overview

A Bill that could alter the Mediation landscape The background behind Mediation Bill:         In General, Disputes Became part and parcel of  Day-to-Day Life. Someone or the Other belonging to family or else not a part of the family would be fighting for something. These Disputes may be for Smaller or B

Military exercises of India

List of all Military Exercises of India 2021 Military Exercises of India with Neighbours Sampriti: India & Bangladesh Mitra Shakti: India & Sri Lanka Surya Kiran: India & Nepal Hand in Hand Exercise: India & China Ekuverin: India & Maldives Military Exercises of India with Other countries Maitree Exer

Consumer Protection Rules, 2021

Consumer Protection (Jurisdiction of the District Commission, the State Commission and the National Commission) Rules, 2021 1) Pecuniary Jurisdiction The Consumer Protection Act, 2019 The Consumer Protection Act, 2019 promulgates a three-tier quasi-judicial mechanism for redressal of consumer disputes namely district commissions, state

Swachh Bharat Mission (Urban) 2.0

The Swachh Bharat Mission - Urban (SBM-U), launched on 2nd October 2014 aims at making urban India free from open defecation and achieving 100% scientific management of municipal solid waste in 4,041 statutory towns in the country. The objectives of the mission are mentioned below: Elimination of open defecation Eradication of Manual S

Students Achievement

Search By Date

Newsletter Subscription
SMS Alerts