{"id":19890,"date":"2020-02-17T15:23:48","date_gmt":"2020-02-17T15:23:48","guid":{"rendered":"https:\/\/research.reading.ac.uk\/research-blog\/?p=19890"},"modified":"2021-11-25T12:13:58","modified_gmt":"2021-11-25T12:13:58","slug":"climate-change-means-longer-take-offs-and-fewer-passengers-per-aeroplane-new-study","status":"publish","type":"post","link":"https:\/\/research.reading.ac.uk\/research-blog\/2020\/02\/17\/climate-change-means-longer-take-offs-and-fewer-passengers-per-aeroplane-new-study\/","title":{"rendered":"Climate change means longer take-offs and fewer passengers per aeroplane \u2013 new study"},"content":{"rendered":"<p><strong>Warmer, less dense air and weaker winds thanks to climate change result in more difficult take-offs for aeroplanes &#8211; and that means\u00a0 carrying fewer passengers for the same amount of fuel, write Reading atmospheric scientist Professor Paul Williams and Cranfield University&#8217;s Dr Guy Gratton <a href=\"https:\/\/theconversation.com\/climate-change-means-longer-take-offs-and-fewer-passengers-per-aeroplane-new-study-131613\">for The Conversation<\/a>.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-19891\" src=\"https:\/\/research.reading.ac.uk\/research-blog\/wp-content\/uploads\/sites\/72\/Unorganized\/boeing-747-867517_640.jpg\" alt=\"\" width=\"700\" height=\"524\" srcset=\"https:\/\/research.reading.ac.uk\/research-blog\/wp-content\/uploads\/sites\/72\/Unorganized\/boeing-747-867517_640.jpg 640w, https:\/\/research.reading.ac.uk\/research-blog\/wp-content\/uploads\/sites\/72\/Unorganized\/boeing-747-867517_640-300x225.jpg 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/p>\n<p><!--more-->The connection between your next flight and climate change is likely clear in your head. More aeroplanes emitting\u00a0<a href=\"https:\/\/www.icao.int\/environmental-protection\/Pages\/aircraft-engine-emissions.aspx\">greenhouse gases<\/a>\u00a0means more global warming. Simple enough, but there\u2019s an opposite side that you probably hadn\u2019t thought of.<\/p>\n<p>As the local climates at airports around the world have changed in the past few decades, the conditions that pilots have relied on in order to take off safely have changed too.\u00a0<a href=\"https:\/\/link.springer.com\/article\/10.1007%2Fs10584-019-02634-z\">Our new research<\/a>\u00a0suggests that higher temperatures and weaker winds are making take-off more difficult. In the long run, this means that airlines are delivering fewer passengers and cargo for the same amount of fuel.<\/p>\n<p>\u201cClimate\u201d essentially\u00a0<a href=\"https:\/\/www.nasa.gov\/audience\/forstudents\/5-8\/features\/nasa-knows\/what-is-climate-change-58.html\">means the average weather conditions<\/a>\u00a0at any given place. Scientists know this is changing, but not uniformly. While global temperatures\u00a0<a href=\"https:\/\/www.gov.uk\/guidance\/climate-change-explained\">have risen by about 1\u00b0C on average<\/a>, some places have warmed by much more already \u2013 and others may be getting cooler.<\/p>\n<p>But climate change isn\u2019t just about temperature \u2013\u00a0<a href=\"https:\/\/www.conservationmagazine.org\/2014\/09\/the-forgotten-part-of-climate-change-slower-winds\/\">winds are slowing down and changing direction around the world too<\/a>. This is a problem for airport runways that were built many years ago to align with the prevailing winds at the time.<\/p>\n<p>Research has predicted that take-off distances\u00a0will get longer\u00a0as the climate warms. This is because higher temperatures reduce air density, which the wings and engines need to get airborne. With reduced headwinds, aeroplanes also need to generate more groundspeed just to get into the air. Once they\u2019re up there, they\u2019re subject to\u00a0<a href=\"https:\/\/phys.org\/news\/2019-08-jet-stream-aircraft-turbulence-climate.html\">in-flight turbulence, which is getting worse<\/a>\u00a0due to climate change increasing the energy in jet stream winds.<\/p>\n<p><a href=\"https:\/\/www.weforum.org\/agenda\/2016\/07\/this-visualization-shows-you-24-hours-of-global-air-traffic-in-just-4-seconds\/\">More than 100,000 aircraft<\/a>\u00a0regularly take off and land around the world each day. The record so far is\u00a0<a href=\"https:\/\/www.independent.co.uk\/travel\/news-and-advice\/flights-sky-map-worldwide-air-traffic-aviation-busiest-day-june-a8428451.html\">202,157, on June 29 2018<\/a>. How are all these changes likely to be affecting them? With colleagues in Britain and\u00a0<a href=\"https:\/\/www.athena-innovation.gr\/en\/environment_network_technologies_unit_dm\">Greece<\/a>, we decided to look at what has happened so far.<\/p>\n<div data-react-class=\"Tweet\" data-react-props=\"{&quot;tweetId&quot;:&quot;1013088775973556224&quot;}\">\n<div>\n<div class=\"SandboxRoot env-bp-350\" data-twitter-event-id=\"0\">\n<div id=\"twitter-widget-0\" class=\"EmbeddedTweet EmbeddedTweet--cta js-clickToOpenTarget\" lang=\"en\" data-click-to-open-target=\"https:\/\/twitter.com\/flightradar24\/status\/1013088775973556224\" data-iframe-title=\"Twitter Tweet\" data-scribe=\"page:tweet\" data-twitter-event-id=\"1\">\n<div class=\"EmbeddedTweet-tweetContainer\">\n<div class=\"CallToAction-chevron\" data-scribe=\"element:cta_chevron\">\n<div class=\"Icon Icon--chevronRightCTA \" title=\"View on Twitter\" role=\"img\" aria-label=\"View on Twitter\"><strong><span style=\"letter-spacing: 0.08px\">Running out of runway<\/span><\/strong><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>We have been recording the weather at ten Greek airports since 1955. For each year, we took the average wind and overnight minimum temperatures, and then plugged that into performance graphs. These are used to calculate the safe runway lengths and aeroplane weights that are needed to ensure that airlines can carry their passengers safely.<\/p>\n<p>Temperature changes varied a lot between the airports we studied, between a 2\u00b0C and 5\u00b0C temperature rise over the 62 years we had data for. So did wind. At one airport, the average speed of wind passing down the runway towards the aeroplane as it took off (known as headwinds) increased by about 25%. At the other extreme, another airport saw average headwinds on the airport\u2019s runway fall by 90% over 43 years.<\/p>\n<p>We found that in every case the conditions had changed over the 62 years to make aeroplane take-off more difficult. Safety regulations ensure that aeroplanes are never allowed to take off without enough runway, but on the longer runways we studied, the take-off distances necessary to get a large jet plane into the air had increased by about 1.5% every decade, and about 1% for a smaller turboprop airliner.<\/p>\n<figure class=\"align-center \"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/images.theconversation.com\/files\/315079\/original\/file-20200212-61935-1l0sexc.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" alt=\"\" width=\"701\" height=\"468\" \/><figcaption><span style=\"font-size: 10pt\"><em><span class=\"caption\">This Boeing 737 is used for research at Cranfield University. Small aircraft like this are the mainstay of smaller airports, and likely to be the most affected by climate change.<\/span>\u00a0<span class=\"attribution\" style=\"font-size: 8pt\"><span class=\"source\">Guy Gratton<\/span>,\u00a0<span class=\"license\">Author provided<\/span><\/span><\/em><\/span><\/figcaption><\/figure>\n<p>In airports with shorter runways, aircraft have to reduce weight. This is all worked out before take-off \u2013 cargo, passenger numbers and fuel loads are adjusted accordingly. In the most extreme case we studied this meant that planes were taking off with one passenger fewer (or about 40 kilometres worth of fuel less) each year. These aeroplanes are climbing less steeply after take-off, creating more pollution and noise nuisance on the ground.<\/p>\n<p>We conducted this research in Greece, but other global studies\u00a0have found similar trends\u00a0elsewhere in the world. Small airports \u2013 such as those on\u00a0<a href=\"https:\/\/www.visitscotland.com\/travel\/getting-around-scotland\/air\/\">islands off Scotland<\/a>\u00a0or in the\u00a0<a href=\"https:\/\/www.tripsavvy.com\/airport-info-every-caribbean-destination-1487877\">Caribbean<\/a>\u00a0\u2013 are likely to suffer the most as the climate continues to change.<\/p>\n<p>That could mean that airlines must reduce the numbers of passengers they carry on flights, or search for ways to lengthen their runways. In some extreme cases, it could become impossible for some aeroplanes to use some airports altogether. This is another reminder of how rapidly and extensively human actions are transforming the world around us, and how ill equipped we are to deal with the consequences.<\/p>\n<p><em>This post <a href=\"https:\/\/theconversation.com\/climate-change-means-longer-take-offs-and-fewer-passengers-per-aeroplane-new-study-131613\">first appeared on The Conversation, 13 February 2020<\/a>. Paul Williams is <a href=\"http:\/\/www.met.reading.ac.uk\/~williams\/\">Professor of Atmospheric Science in the Department of Meteorology<\/a> at the University of Reading, specialising in geophysical fluid dynamics, climate change, and numerical modelling. He won a University of Reading <a href=\"http:\/\/www.reading.ac.uk\/research\/impact\/research-engagement-awards-2018.aspx\">Impact and Engagement Award 2018<\/a> in the Influence category for his aviation turbulence research.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warmer, less dense air and weaker winds thanks to climate change result in more difficult take-offs for aeroplanes &#8211; and that means\u00a0 carrying fewer passengers for the same amount of&#8230;<a class=\"read-more\" href=\"&#104;&#116;&#116;&#112;&#115;&#58;&#47;&#47;&#114;&#101;&#115;&#101;&#97;&#114;&#99;&#104;&#46;&#114;&#101;&#97;&#100;&#105;&#110;&#103;&#46;&#97;&#99;&#46;&#117;&#107;&#47;&#114;&#101;&#115;&#101;&#97;&#114;&#99;&#104;&#45;&#98;&#108;&#111;&#103;&#47;&#50;&#48;&#50;&#48;&#47;&#48;&#50;&#47;&#49;&#55;&#47;&#99;&#108;&#105;&#109;&#97;&#116;&#101;&#45;&#99;&#104;&#97;&#110;&#103;&#101;&#45;&#109;&#101;&#97;&#110;&#115;&#45;&#108;&#111;&#110;&#103;&#101;&#114;&#45;&#116;&#97;&#107;&#101;&#45;&#111;&#102;&#102;&#115;&#45;&#97;&#110;&#100;&#45;&#102;&#101;&#119;&#101;&#114;&#45;&#112;&#97;&#115;&#115;&#101;&#110;&#103;&#101;&#114;&#115;&#45;&#112;&#101;&#114;&#45;&#97;&#101;&#114;&#111;&#112;&#108;&#97;&#110;&#101;&#45;&#110;&#101;&#119;&#45;&#115;&#116;&#117;&#100;&#121;&#47;\">Read More ><\/a><\/p>\n","protected":false},"author":127,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"__cvm_playback_settings":[],"__cvm_video_id":"","footnotes":""},"categories":[13],"tags":[89,189,370,891],"class_list":["post-19890","post","type-post","status-publish","format-standard","hentry","category-environment","tag-atmospheric-science","tag-climate-change","tag-flights","tag-turbulence"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Climate change means longer take-offs and fewer passengers per aeroplane \u2013 new study - Connecting Research<\/title>\n<meta name=\"description\" content=\"Warmer, less dense air and weaker winds thanks 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