{"id":20027313,"date":"2019-05-15T12:45:47","date_gmt":"2019-05-15T07:15:47","guid":{"rendered":"https:\/\/www.thethirdpole.net\/?p=27313"},"modified":"2021-01-05T17:43:09","modified_gmt":"2021-01-05T12:13:09","slug":"why-the-indian-ocean-is-spawning-strong-and-deadly-tropical-cyclones","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/ocean\/why-the-indian-ocean-is-spawning-strong-and-deadly-tropical-cyclones\/","title":{"rendered":"Why the Indian Ocean is spawning strong and deadly tropical cyclones"},"content":{"rendered":"<p>The Indian Ocean has made its mark on the global news cycle this year. In March, <a href=\"https:\/\/theconversation.com\/tropical-cyclone-idai-the-storm-that-knew-no-boundaries-113931\">tropical cyclone Idai<\/a> made headlines as one of the most severe storms to have made landfall in Mozambique. Current estimates <a href=\"https:\/\/ewn.co.za\/2019\/04\/15\/cyclone-idai-s-death-toll-over-1-000-hundreds-of-thousands-displaced\">indicate<\/a> that more than 1,000 people died. This makes it the most deadly tropical cyclone ever to have made landfall on the southern African subcontinent.<\/p>\n<p>Until Idai, <a href=\"https:\/\/journals.ametsoc.org\/doi\/full\/10.1175\/1520-0434%282004%29019%3C0789%3ATCEAIU%3E2.0.CO%3B2\">tropical cyclone Eline<\/a>, which struck in 2000, was the most devastating tropical cyclone to make landfall in Mozambique.<\/p>\n<p>After Idai, Eline was the strongest \u2013 though not the deadliest \u2013 cyclone to have hit the southern east African cost. This ranking as the strongest was soon after challenged by <a href=\"https:\/\/www.accuweather.com\/en\/weather-news\/deadly-cyclone-kenneth-wallops-mozambique-as-life-threatening-flooding-persists\/70008064\">tropical cyclone Kenneth<\/a>, a category 4 tropical cyclone that made landfall over the border of Mozambique and Tanzania six weeks after Idai.<\/p>\n<p>Kenneth, in many regards, took the region by surprise. The storm was the northernmost tropical cyclone to make landfall on Mozambique, and the first to make landfall on Tanzania. It occurred very late in the season. Most cyclones in the region occur from January to March. It was also unusual for the <a href=\"https:\/\/www.britannica.com\/place\/Mozambique-Channel\">Mozambique Channel<\/a> to experience two severe tropical cyclones that made landfall within one season.<\/p>\n<p>The third major cyclone to emerge out of the Indian Ocean came a few weeks after Kenneth, when <a href=\"https:\/\/www.enca.com\/news\/cyclone-fani-death-toll-rises-42-india-bangladesh\">cyclone Fani<\/a>, a tropical cyclone on the border of Category 5 intensity wind speeds, hit the east coast of India. Category 5 tropical cyclones were only first recorded in the North Indian Ocean <a href=\"http:\/\/www.scielo.org.za\/scielo.php?script=sci_arttext&amp;pid=S0038-23532018000600018\">from 1989<\/a> so, again, this storm is unusually severe in the context of the longer historical records.<\/p>\n<p>These high intensity storms have been tied to the very warm sea surface temperatures in the Indian Ocean. Temperatures of 30\u00b0C are occurring more often and over longer periods of time. This is a result of gradual warming on a global scale, which has resulted in a net increase in ocean temperatures.<\/p>\n<p>Warmer ocean temperatures <a href=\"https:\/\/www.nature.com\/articles\/nature03906\">allow<\/a> stronger storms to form. These conditions are exacerbated by global forcing mechanisms including <a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/abs\/10.1029\/1999GL900072\">El Ni\u00f1o<\/a> and the Indian Ocean Dipole, which concentrates warm ocean waters in smaller geographic areas.<\/p>\n<p>High intensity storms have been a frequent feature along the coast of the US throughout recorded history. Their increased frequency in the Indian Ocean should be raising alarm bells because countries like the US are much better equipped to help people prepare ahead of time, and to handle the fallout.<\/p>\n<p><strong>Measuring intensity<\/strong><\/p>\n<p>Tropical cyclone intensity is classified according to the <a href=\"https:\/\/www.nhc.noaa.gov\/aboutsshws.php\">Saffir Simpson scale<\/a>. Categories are measured on the basis of the sustained wind speed and the storm\u2019s central pressure. Each category is accompanied by estimates of the likely severity of damage and possible storm surge height.<\/p>\n<p>Tropical cyclones form and intensify due to a combination of seven primary climatological conditions. Among other things, these include warm sea surface temperatures, high humidity levels and atmospheric instability.<\/p>\n<p>For a storm to intensify, these conditions have to be maximised while the storm remains over the ocean.<\/p>\n<p>Tropical cyclones require a sea surface temperature of 26.5\u00b0C to form, while the highest intensity storms require much warmer sea surface temperatures of 28-29\u00b0C. This is important because it\u2019s one of the reasons why southern Africa is experiencing more intense tropical cyclones.<\/p>\n<p>The South Indian Ocean is <a href=\"https:\/\/science.sciencemag.org\/content\/309\/5732\/284\">warming rapidly<\/a>. This means that regions that previously experienced the temperatures of 26.5\u00b0C that facilitated tropical cyclone formation are now experiencing temperatures as warm as 30-32\u00b0C.<\/p>\n<p>Simultaneously, regions further from the equator which didn\u2019t previously have sufficiently warm water for tropical cyclone formation, with sea surface temperatures of 24-26\u00b0C are more regularly experiencing the threshold temperature. This increases the range in which these storms occur, making storms like <a href=\"https:\/\/citizen.co.za\/news\/south-africa\/1427761\/severe-tropical-storm-heading-to-sa-warns-weather-service\/\">tropical cyclone Dineo<\/a>, which made landfall in February 2017 in southern Mozambique, more common.<\/p>\n<p>These very warm sea surface temperatures are not a factor of global scale warming alone. They\u2019re further influenced by a range of global and local forcing mechanisms. These include <a href=\"https:\/\/rmets.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/joc.3932\">El Ni\u00f1o Southern Oscillation<\/a>, the Indian Ocean Dipole and the <a href=\"https:\/\/rmets.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/joc.3932\">Southern Annular Mode<\/a>. For this particular cyclone season, <a href=\"https:\/\/twitter.com\/pppapin\/status\/1123756048769269760\">scientists are seeing<\/a> the strongest impact from the [Madden-Julian Oscillation].<\/p>\n<p>This is a band of moisture in the tropical regions which moves eastward over a 30 to 90 day period. The strong <a href=\"https:\/\/www.abc.net.au\/news\/2019-03-03\/madden-julian-oscillation-causing-wa-cyclones-to-vanish\/10855032\">Madden-Julian Oscillation<\/a> is also affecting tropical cyclones in Australia.<\/p>\n<p><strong>Comparing storms<\/strong><\/p>\n<p>Ranking storms on the basis of their Saffir Simpson classification is not always the most valuable measure. That\u2019s because it can\u2019t take the characteristics of the location of landfall into consideration.<\/p>\n<p>This results in two key shortcomings. First, it doesn\u2019t take the flooding potential into account. This is difficult to identify for a particular storm, because it\u2019s not only a function of how much rain is experienced and over what period \u2013 or even the height of storm surge \u2013 but also the nature of the region of landfall.<\/p>\n<p>Lower-lying, relatively flat areas are more prone to flooding than higher elevation regions or those with rugged topography. This is part of the reason that Idai caused such severe flooding. Some regions will have better suited storm water infrastructure. And when flooding does occur, some regions are better able to warn and evacuate people to prevent or minimise the loss of life.<\/p>\n<p>Another factor which determines the devastation resulting from a tropical cyclone is the population density of the area of landfall. The higher the population density, the more people who are at threat of losing their life, their homes and livelihoods.<\/p>\n<p>This also means more people who would need to be evacuated in a short period, and more people who need shelter until the storm\u2019s immediate effects have subsided. This is why Idai and Eline resulted in far greater losses and fatalities than the stronger intensity Kenneth, and why the total damage from Fani is projected to be particularly devastating. We need to start measuring storm destructiveness in addition to climatological metrics.<em>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As oceans heat up tropical cyclones will are becoming more frequent, but it is local conditions, especially the prevalence of low lying areas and weak infrastructure that determine how devastating they are<\/p>\n","protected":false},"author":2194,"featured_media":20027314,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[761,50039901],"tags":[17827,519,20000192,543],"hashtags":[],"country":[20000111,50040721,50040722],"class_list":["post-20027313","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate","category-ocean","tag-climate-adaptation","tag-climate-impacts","tag-disasters","tag-extreme-weather","country-india","country-mozambique","country-tanzania"],"acf":[],"yoast_head":"<!-- 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