{"id":20008541,"date":"2014-07-17T10:25:56","date_gmt":"2014-07-17T04:55:56","guid":{"rendered":"https:\/\/www.thethirdpole.net\/?p=8541"},"modified":"2020-11-19T17:59:50","modified_gmt":"2020-11-19T12:29:50","slug":"newly-found-wind-oscillation-may-keep-drought-at-bay","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/climate\/newly-found-wind-oscillation-may-keep-drought-at-bay\/","title":{"rendered":"Newly found wind oscillation may keep drought at bay"},"content":{"rendered":"

The great Indian monsoon hit mainland India in early June and, as feared, hasn\u2019t quite delivered. Meteorologists, farmers and economists, who have been waiting with trepidation for what is expected to be a below par rainfall year, will continue to watch the clouds closely. As the El Ni\u00f1o Southern Oscillation (ENSO) unfolds in the Pacific Ocean, there is a 70% probability that it could snatch the rain away from South Asia and produce a drought.<\/p>\n

This is bad news, since South Asia gets between 70 and 80% of its annual rainfall in the four monsoon months \u2013 June to September. Over 60% of the farmers in India depend on this rain to grow their major crops for the year.<\/p>\n

Sulochana Gadgil\u2019s eyes are on the satellite pictures from the Indian Ocean. An honorary professor of atmospheric and ocean sciences at the Indian Institute of Science, Bangalore, Gadgil is watching another phenomenon closer home called the Equatorial Indian Ocean Oscillation (EQUINOO). This oscillation, Gadgil says, has a major impact on the Indian monsoons and the potential to alleviate the impact of El Ni\u00f1o.<\/p>\n

EQUINOO is a see-saw of atmospheric conditions between the eastern and western parts of the Indian Ocean. Normally during the Indian summer the eastern equatorial Indian Ocean, which is warmer than the western part, has abundant cloud cover. In the four months of the monsoon, there is more than average cloud formation over the eastern Indian Ocean in some years, and more over the western Indian Ocean in others. The condition that favours a healthy Indian monsoon is one where there are dense clouds over the western Indian Ocean and fewer clouds in the east.<\/p>\n

The El N<\/strong>i\u00f1o<\/strong> location factor<\/strong><\/h2>\n

The threat to the Indian monsoon from El Ni\u00f1o depends on the location of the current. An El Ni\u00f1o in the central Pacific has a profound influence on rain-bearing winds over the subcontinent. High sea surface temperatures (SST) brought on by the warm bubble of water heats the air above the ocean. Rising warm air forms circulation cells in the upper atmosphere that draws air currents toward the region. The Indian Ocean is located in this downdraft and monsoon air currents here are disrupted. The stronger the El Ni\u00f1o, the more disruptive it is.<\/p>\n

Six of the major droughts in India since the late 19th century have been El Ni\u00f1o droughts, including those in 2002 and 2009. But not all El Ni\u00f1o years have been drought or even sub-normal rainfall years. This has led to some spectacularly wrong predictions of the Indian monsoon.<\/p>\n

Gadgil and her colleagues discovered the EQUINOO in 2003 while looking for explanations for monsoon prediction failures. \u201cWhat happened in 1997 was that everybody thought it would be a drought (year) because it was a very strong El Ni\u00f1o. So people went ahead and predicted a drought, and what we got was above average rain. In fact, there were papers written that the monsoon-ENSO link is now weaker. But then came the El Ni\u00f1o of 2002, which was much weaker than the El Ni\u00f1o of 1997, and we got a severe drought. This led many people into wondering what exactly is going on. There must be one more thing,\u201d said Gadgil.<\/p>\n

Gadgil and her collaborators propose that the South Asian monsoon depends on two main factors \u2013 the strength of El Ni\u00f1o, and the phase of EQUINOO. A strong El Ni\u00f1o portends a drought in India but can be countered by an EQUINOO phase that brings rain in the western Indian Ocean. A weak El Ni\u00f1o, which might otherwise let the monsoon go about its business, can create drought conditions if the EQUINOO phase favours the eastern Indian Ocean.<\/p>\n

In addition, an El Ni\u00f1o formation in the central Pacific suppresses the cloud formation in the eastern Indian Ocean, creating conditions favourable to the Indian monsoon. According to Gadgil, in 1997 there was a \u201ctug-of-war\u201d between El Ni\u00f1o and EQUINOO that ultimately resulted in a normal monsoon. Heavy clouds in the western equatorial Indian Ocean prevailed and brought rain to the subcontinent. In 2002, the El Ni\u00f1o and EQUINOO colluded. The clouds in the Indian Ocean formed mostly over the eastern Indian Ocean. The result was a drought.<\/p>\n

EQUINOO conditions positive this year<\/strong><\/h2>\n

Gadgil, who has been monitoring atmospherics in the Indian Ocean, says EQUINOO conditions in the summer months were positive for a good monsoon this year. But an atmospheric system is dynamic and liable to change.<\/p>\n

With EQUINOO being a relatively new discovery, climate models are not able to predict EQUINOO or simulate monsoon-EQUINOO links. In an editorial in the journal Current Science<\/a>, Gadgil says that while El Ni\u00f1o explains 29% of the monsoon variation in India, EQUINOO explains another 19%. Taking into account the influence of El Ni\u00f1o on cloud formation in the Indian Ocean the two phenomena together can explain more than 50% of the variation, which could result in far higher accuracy in monsoon forecasting than we have today.<\/p>\n

Gadgil hopes that observation and modelling studies for EQUINOO will be taken up in a big way for better accuracy in predicting the Indian climate. \u201cI personally expect that in the next five to ten years we will definitely be able to do it,\u201d she said.<\/p>\n","protected":false},"excerpt":{"rendered":"

A recently discovered meteorological phenomenon in the Indian Ocean, called EQUINOO, can fill in the gaps in the monsoon-El Ni\u00f1o link and explain why an El Ni\u00f1o year is not necessarily a drought year<\/p>\n","protected":false},"author":20000171,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[761],"tags":[519,543,20000628,607],"hashtags":[],"country":[20000111],"class_list":["post-20008541","post","type-post","status-publish","format-standard","hentry","category-climate","tag-climate-impacts","tag-extreme-weather","tag-science","tag-water-scarcity","country-india"],"acf":[],"yoast_head":"\nNewly found wind oscillation may keep drought at bay | Dialogue Earth<\/title>\n<meta name=\"description\" content=\"A recently discovered meteorological phenomenon in the Indian Ocean, called EQUINOO, can fill in the gaps in the monsoon-El Ni\u00f1o link and explain 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