{"id":60560,"date":"2023-07-27T06:46:27","date_gmt":"2023-07-26T18:46:27","guid":{"rendered":"https:\/\/www.greenpeace.org\/aotearoa\/?p=60560"},"modified":"2025-05-20T14:03:07","modified_gmt":"2025-05-20T02:03:07","slug":"el-nino-combined-with-global-warming-means-big-changes-for-new-zealands-weather","status":"publish","type":"post","link":"https:\/\/www.greenpeace.org\/aotearoa\/story\/el-nino-combined-with-global-warming-means-big-changes-for-new-zealands-weather\/","title":{"rendered":"El Ni\u00f1o combined with global warming means big changes for New Zealand\u2019s weather"},"content":{"rendered":"\n<p>El Ni\u00f1o is officially here, according to the US National Oceanic and Atmospheric Administration, and with it comes a change from the La Ni\u00f1a weather patterns New Zealand has experienced for the past three years.<\/p>\n\n<p>In particular, a switch from prevailing northeasterlies to southwesterlies means New Zealand is one of the few countries where cooler conditions are felt during El Ni\u00f1o. But what \u201cflavour\u201d will this El Ni\u00f1o be?<\/p>\n\n<p>Time will tell, but El Ni\u00f1o has been looming for some time. Evidence of its imminent arrival could be seen last year in subsurface ocean temperatures, with a buildup of warm water in the Coral Sea and western tropical Pacific.<\/p>\n\n<p>Moreover, it was overdue. When La Ni\u00f1a finally gave up the ghost in March this year, global sea surface temperatures were suddenly the highest on record (Figure 1 below), as the tropical Pacific abruptly began to warm.<\/p>\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/images.theconversation.com\/files\/531270\/original\/file-20230612-29-braw6w.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/531270\/original\/file-20230612-29-braw6w.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" alt=\"\"\/><\/a><figcaption class=\"wp-element-caption\">Figure 1. Global mean sea surface temperatures (with other calendar years in grey), showing 2023\u2019s record highs. <a href=\"https:\/\/climatereanalyzer.org\/clim\/sst_daily\/\">University of Maine<\/a>, Author provided<\/figcaption><\/figure>\n\n<p>Meanwhile, record high sea surface temperatures in the extratropical North and South Pacific were partly a signature from La Ni\u00f1a and partly a sign of global warming. The resulting \u201catmospheric rivers\u201d delivered torrential rains to California in the north and New Zealand in the south.<\/p>\n\n<p>These sea surface temperature changes can be readily seen by comparing variations from mean temperatures for December 2022 versus May 2023 (Figure 2 below). We can see a startling transformation throughout the central tropical Pacific, with a coastal El Ni\u00f1o off Peru and Ecuador strongly evident.<\/p>\n\n<p>Modest cooling in the eastern North Pacific is associated with the train of storms that barrelled into the West Coast of the US and in northwest Australia from Cyclone Ilsa.<\/p>\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/images.theconversation.com\/files\/531271\/original\/file-20230612-151713-wk6u4j.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/531271\/original\/file-20230612-151713-wk6u4j.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" alt=\"\"\/><\/a><figcaption class=\"wp-element-caption\">Fig 2. Sea surface temperature changes (measured by departure from the mean), comparing December 2022 and May 2023. <a href=\"https:\/\/www.climate.gov\/maps-data\/data-snapshots\/data-source\/sst-global-monthly-difference-average\">National Oceanic and Atmospheric Administration<\/a>, Author provided<\/figcaption><\/figure>\n\n<h2 class=\"wp-block-heading\" id=\"h-el-nino-and-new-zealand\">El Ni\u00f1o and New Zealand<\/h2>\n\n<p>The weather in the tropics is seldom average, however. It tends to fluctuate more like a roller coaster. In the atmosphere, this is referred to as the Southern Oscillation. The combined atmosphere and ocean phenomenon is often referred to as the El Ni\u00f1o-Southern Oscillation (ENSO).<\/p>\n\n<p>The bottom of the roller coaster is the cold phase: a basin-wide cooling of the tropical Pacific, named La Ni\u00f1a, while the top of the roller coaster is El Ni\u00f1o, which occurs every three to seven years or so. The most intense phase of each event typically lasts half a year.<\/p>\n\n<p>But El Ni\u00f1os can be very strong, and hence highly anomalous. La Ni\u00f1as, by comparison, are usually moderate in strength and occur more often.<\/p>\n\n<p>El Ni\u00f1os tend to peak in December, although their biggest atmospheric impacts may not be until February. The last major El Ni\u00f1o was in 2016-17, while a weak El Ni\u00f1o occurred in 2019-20.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-coupled-oceans-and-atmosphere\">Coupled oceans and atmosphere<\/h2>\n\n<p>In the tropical Pacific Ocean, the atmosphere and ocean are strongly coupled. Surface winds drive surface ocean currents, and largely determine the sea surface temperature distribution, the differential sea levels, and the <a href=\"https:\/\/doi.org\/10.1175\/JCLI-D-18-0607.1\">heat content of the upper ocean<\/a>. In turn, the sea surface temperatures determine the winds.<\/p>\n\n<p>Cool waters limit atmospheric convection and storm activity, while high sea surface temperatures attract convection, clusters of thunderstorms, and tropical cyclones (off the equator, where Earth\u2019s rotation comes into play).<\/p>\n\n<p>Heat that was stored up in the tropical western Pacific during La Ni\u00f1a is moved around and into the atmosphere during El Ni\u00f1o, mainly through evaporation. This cools the ocean and moistens the atmosphere.<\/p>\n\n<p>This alters where the main rainfall occurs. In turn, it changes the latent heating of the atmosphere that sets up \u201c<a href=\"https:\/\/www.climate.gov\/news-features\/blogs\/what-are-teleconnections-connecting-earths-climate-patterns-global-information\">teleconnections<\/a>\u201d (links between weather phenomena in different parts of the globe) and major changes in the jet streams and extratropical storm tracks in both hemispheres \u2013 including across New Zealand, especially in winter.<\/p>\n\n<p>Because most action occurs over the tropical Pacific Ocean, more settled weather and dry spells often occur over land.<\/p>\n\n<p>The warmest years in terms of global mean surface temperature are the latter stages of El Ni\u00f1o events. 2016 is the world\u2019s warmest year on record, in part because of the very strong El Ni\u00f1o event. But 2023 could beat that record \u2013 and odds are that 2024 will beat it by a lot.<\/p>\n\n<p>So far, there is little evidence that climate change has altered ENSO events themselves. But all impacts of El Ni\u00f1o are exacerbated by global warming, including extremes of the hydrological cycle involving floods and droughts, which are already common with ENSO.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-impacts-of-el-nino\">Impacts of El Ni\u00f1o<\/h2>\n\n<p>Of course, major events related to El Ni\u00f1o have serious social and economic impacts, too. Droughts, floods, heatwaves and other changes can severely disrupt agriculture, fisheries, health, energy demand and air quality (mainly from wildfires).<\/p>\n\n<p><a href=\"https:\/\/doi.org\/10.1126\/science.adf2983\">Research shows<\/a> El Ni\u00f1o \u201cpersistently reduces country-level economic growth\u201d, with damage now estimated in the trillions of US dollars.<\/p>\n\n<p>Globally, El Ni\u00f1o is the <a href=\"https:\/\/doi.org\/10.1002\/9781119548164.ch2\">largest cause of droughts<\/a>; they are more intense, set in quicker and increase the risk of wildfires, especially in Australia, Indonesia and Brazil. In the weak 2019-20 El Ni\u00f1o, smoke from fires in eastern Australia affected the southern hemisphere to the extent that it blocked the sun and may have <a href=\"https:\/\/doi.org\/10.1126\/sciadv.adg1213\">exacerbated<\/a> the subsequent La Ni\u00f1a conditions.<\/p>\n\n<p>Meanwhile, torrential rains are heavier, with greater risk of flooding, especially in Peru and Ecuador. Very wet conditions can also (though not always) occur in California and the southeast US.<\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-another-super-el-nino\">Another \u2018super\u2019 El Ni\u00f1o?<\/h2>\n\n<p>New Zealand had its <a href=\"https:\/\/www.rnz.co.nz\/news\/national\/482221\/2022-confirmed-as-country-s-warmest-year-on-record\">highest annual mean surface temperature<\/a> on record in 2022. In the past year the preponderance of northeasterlies due to La Ni\u00f1a has seen an unprecedented number of tropical and subtropical storms bombarding the country.<\/p>\n\n<p>The record rain event in Auckland on January 27, and Cyclone Gabrielle just three weeks later, were just two among many such events.<\/p>\n\n<p>By contrast, New Zealand tends to experience stronger and more frequent winds from the southwest in winter and from the west in summer during El Ni\u00f1o. This can encourage dryness in eastern areas and more rain on the West Coast, with generally cooler conditions overall.<\/p>\n\n<p>But <a href=\"https:\/\/doi.org\/10.1002\/9781119548164.ch2\">El Ni\u00f1o varies<\/a>, and there have been three \u201csuper\u201d El Ni\u00f1os: 1982-83, 1997-98 and 2015-16. It remains to be seen whether the latest will join them. But together with the augmenting effects of global warming, any El Ni\u00f1o can be very disruptive. We need to be vigilant.<\/p>\n\t\t\t<section\n\t\t\tclass=\"boxout post-53488 \"\n\t\t\t\n\t\t>\n\t\t\t<a\n\t\t\t\tdata-ga-category=\"Take Action Boxout\"\n\t\t\t\tdata-ga-action=\"Image\"\n\t\t\t\tdata-ga-label=\"n\/a\"\n\t\t\t\tclass=\"cover-card-overlay\"\n\t\t\t\thref=\"https:\/\/www.greenpeace.org\/aotearoa\/petition\/keep-corporate-sponsors-like-coca-cola-out-of-international-climate-talks\/\" \n\t\t\t><\/a>\n\t\t\t\t\t\t\t<img\n\t\t\t\t\t\tsrc=\"https:\/\/www.greenpeace.org\/static\/planet4-aotearoa-stateless\/2022\/10\/027caf4d-gp1swk5i_medium_res-compressed-1024x683.jpg\"\n\t\t\t\t\t\tsrcset=\"https:\/\/www.greenpeace.org\/static\/planet4-aotearoa-stateless\/2022\/10\/027caf4d-gp1swk5i_medium_res-compressed-600x400.jpg 600w, https:\/\/www.greenpeace.org\/static\/planet4-aotearoa-stateless\/2022\/10\/027caf4d-gp1swk5i_medium_res-compressed-1024x683.jpg 1024w, https:\/\/www.greenpeace.org\/static\/planet4-aotearoa-stateless\/2022\/10\/027caf4d-gp1swk5i_medium_res-compressed-768x512.jpg 768w, https:\/\/www.greenpeace.org\/static\/planet4-aotearoa-stateless\/2022\/10\/027caf4d-gp1swk5i_medium_res-compressed-510x340.jpg 510w, https:\/\/www.greenpeace.org\/static\/planet4-aotearoa-stateless\/2022\/10\/027caf4d-gp1swk5i_medium_res-compressed.jpg 1200w\"\n\t\t\t\t\t\tsizes=\"(min-width: 1000px) 358px, (min-width: 780px) 313px, 88px\"\n\t\t\t\t\t\talt=\"\" title=\"\"\n\t\t\t\t\/>\n            \t\t\t<div class=\"boxout-content\">\n\t\t\t\t\t\t\t\t\t<a\n\t\t\t\t\t\tclass=\"boxout-heading medium\"\n\t\t\t\t\t\tdata-ga-category=\"Take Action Boxout\"\n\t\t\t\t\t\tdata-ga-action=\"Title\"\n\t\t\t\t\t\tdata-ga-label=\"n\/a\"\n\t\t\t\t\t\thref=\"https:\/\/www.greenpeace.org\/aotearoa\/petition\/keep-corporate-sponsors-like-coca-cola-out-of-international-climate-talks\/\"\n\t\t\t\t\t\t\n\t\t\t\t\t>\n\t\t\t\t\t\tPETITION: Keep corporate sponsors out of COP climate talks\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"boxout-excerpt\">Join the call on the United Nations to reject corporate sponsorship of international climate negotiations.<\/p>\n\t\t\t\t                                    <a\n                        class=\"btn btn-primary\"\n                        data-ga-category=\"Take Action Boxout\"\n                        data-ga-action=\"Call to Action\"\n                        data-ga-label=\"n\/a\"\n                        href=\"https:\/\/www.greenpeace.org\/aotearoa\/petition\/keep-corporate-sponsors-like-coca-cola-out-of-international-climate-talks\/\"\n                        \n                    >\n                        Take Action\n                    <\/a>\n                \t\t\t<\/div>\n\t\t\t\t\t<\/section>\n\t\n<p><em><a href=\"https:\/\/theconversation.com\/profiles\/kevin-trenberth-15259\">Kevin Trenberth<\/a>, Distinguished Scholar, NCAR; Affiliate Faculty, <a href=\"https:\/\/theconversation.com\/institutions\/university-of-auckland-1305\">University of Auckland<\/a><\/em><\/p>\n\n<p><em>This article is republished from <a href=\"https:\/\/theconversation.com\">The Conversation<\/a> under a Creative Commons license. Read the <a href=\"https:\/\/theconversation.com\/el-nino-combined-with-global-warming-means-big-changes-for-new-zealands-weather-207493\">original article<\/a>.<\/em><\/p>\n\n<p class=\"has-beige-100-background-color has-background has-medium-font-size\">This article\u00a0is a guest post and doesn&#8217;t necessarily represent the views of Greenpeace.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El Ni\u00f1o is officially here, according to the US National Oceanic and Atmospheric Administration, and with it comes a change from the La Ni\u00f1a weather patterns New Zealand has experienced for the past three years.<\/p>\n","protected":false},"author":6,"featured_media":5476,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_planet4_optimize_post_is_variant":false,"_planet4_optimize_experiment_name":"","_planet4_optimize_variant_name":"","ep_exclude_from_search":false,"p4_og_title":"","p4_og_description":"","p4_og_image":"","p4_og_image_id":"","p4_seo_canonical_url":"","p4_campaign_name":"","p4_local_project":"","p4_basket_name":"","p4_department":"","footnotes":""},"categories":[10],"tags":[16],"p4-page-type":[6],"class_list":["post-60560","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-greenpeace","tag-climate","p4-page-type-story"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>El Ni\u00f1o combined with global warming means big changes for New Zealand\u2019s weather<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.greenpeace.org\/aotearoa\/story\/el-nino-combined-with-global-warming-means-big-changes-for-new-zealands-weather\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"El Ni\u00f1o combined with global warming means big changes for New Zealand\u2019s weather\" \/>\n<meta property=\"og:description\" content=\"El Ni\u00f1o is officially here, according to the US National Oceanic and Atmospheric Administration, and with it comes a change from the La Ni\u00f1a weather patterns New Zealand has experienced for the past three years.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.greenpeace.org\/aotearoa\/story\/el-nino-combined-with-global-warming-means-big-changes-for-new-zealands-weather\/\" \/>\n<meta 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