{"id":771,"date":"2013-08-14T20:45:51","date_gmt":"2013-08-14T20:45:51","guid":{"rendered":"https:\/\/redracc.org\/?p=771"},"modified":"2013-08-14T20:46:56","modified_gmt":"2013-08-14T20:46:56","slug":"ozone-hole-could-boost-global-warming","status":"publish","type":"post","link":"https:\/\/redracc.org\/?p=771","title":{"rendered":"Ozone hole could boost global warming"},"content":{"rendered":"<header><time style=\"font-size: 13px; line-height: 19px;\" datetime=\"2013-08-09T17:00:24+01:00\"><abbr title=\"2013-08-09\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft  wp-image-772\" alt=\"ozonehole_1995_2004_09\" src=\"https:\/\/redracc.org\/wp-content\/uploads\/2013\/08\/ozonehole_1995_2004_09.jpg\" width=\"360\" height=\"310\" srcset=\"https:\/\/redracc.org\/wp-content\/uploads\/2013\/08\/ozonehole_1995_2004_09.jpg 1000w, https:\/\/redracc.org\/wp-content\/uploads\/2013\/08\/ozonehole_1995_2004_09-300x258.jpg 300w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/>09 Aug 2013\u00a0<\/abbr>|<abbr title=\"17:00:24+0100\">\u00a017:00 BST<\/abbr><\/time><span style=\"font-size: 13px; line-height: 19px;\">\u00a0|\u00a0Posted by\u00a0<\/span><a style=\"font-size: 13px; line-height: 19px;\" title=\"Davide Castelvecchi\" href=\"http:\/\/blogs.nature.com\/news\/author\/Davide-Castelvecchi\">Davide Castelvecchi<\/a><span style=\"font-size: 13px; line-height: 19px;\">\u00a0|\u00a0Category:\u00a0<\/span><a style=\"font-size: 13px; line-height: 19px;\" href=\"http:\/\/blogs.nature.com\/news\/category\/earth-environment-ecology\" rel=\"tag\">Earth, environment &amp; ecology<\/a><\/header>\n<section>\n<div>\n<p><em>Posted on behalf of Richard Johnston.<\/em><\/p>\n<p>The thinning of the\u00a0<a href=\"http:\/\/www.nature.com\/news\/2009\/090812\/full\/460792a.html\">atmosphere\u2019s ozone layer<\/a>\u00a0could be contributing to warming the planet, according to a study published this week in\u00a0<a href=\"http:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/grl.50675\/abstract\"><em>Geophysical Research Letters<\/em><\/a>.<\/p>\n<p>Kevin Grise, an atmospheric scientist at Columbia University in New York, and his team modelled the weather dynamics around the ozone hole above the Antarctic. They calculated the knock-on effects of ozone depletion on cloud cover, and ultimately on radiative forcing \u2014 the balance of solar and thermal radiation absorbed, reflected or emitted by the planet and its atmosphere.<\/p>\n<p>Previous research by Piers Forster, an atmospheric scientist at the University of Leeds, UK, and his collaborators attributed\u00a0<a href=\"http:\/\/www.ipcc.ch\/pdf\/assessment-report\/ar4\/wg1\/ar4-wg1-chapter2.pdf\">a slight cooling effect to the ozone hole<\/a>. But the latest study, which focused on the Antarctic summer between December and February, found that there may be a warming effect instead.<\/p>\n<p>The team\u2019s models predicted a shift in the southern-hemisphere jet stream \u2014 the high-altitude air currents flowing around Antarctica \u2014 as a result of ozone depletion. This produced a change in the cloud distribution, with clouds moving towards the South Pole, where they are less effective at reflecting solar radiation.<\/p>\n<p>The result was that the effects on the Earth\u2019s net energy balance were opposite to what had been calculated before. \u201cA negative radiative forcing is what you\u2019d expect when the ozone is depleted, but our research shows that there is a positive net radiative effect during the Antarctic summer,\u201d Grise says.<\/p>\n<p>The extra net energy absorbed by the Earth would be 0.25 watts per square metre, or roughly a tenth of the greenhouse effect attributed to CO2,\u00a0Grise says. The result could be a small but non-negligible contribution to global temperature rise.<\/p>\n<p>\u201cI think it\u2019s an interesting piece of research. They are talking about a new mechanism in the world of ozone and climate change,\u201d says Forster. \u201cThere\u2019s quite a lot of work to be done to pin down the mechanism, but it does sound reasonable.\u201d<\/p>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>09 Aug 2013\u00a0|\u00a017:00 BST\u00a0|\u00a0Posted by\u00a0Davide Castelvecchi\u00a0|\u00a0Category:\u00a0Earth, environment &amp; ecology Posted on behalf of Richard Johnston. The thinning of the\u00a0atmosphere\u2019s ozone layer\u00a0could be contributing to warming the planet, according to a study published this week in\u00a0Geophysical Research Letters. Kevin Grise, an atmospheric scientist at Columbia University in New York, and his team modelled the weather dynamics around the ozone hole above the Antarctic. They calculated the knock-on effects of ozone depletion on cloud cover, and ultimately on radiative forcing \u2014 the balance of solar and thermal radiation absorbed, reflected or emitted by the planet and its atmosphere. Previous research by Piers Forster, an atmospheric scientist at the University of Leeds, UK, and his collaborators attributed\u00a0a slight cooling effect to the ozone hole. But the latest study, which focused on the Antarctic summer between December and February, found that there may be a warming effect instead. The team\u2019s models predicted a shift in the southern-hemisphere jet stream \u2014 the high-altitude air currents flowing around Antarctica \u2014 as a result of ozone depletion. This produced a change in the cloud distribution, with clouds moving towards the South Pole, where they are less effective at reflecting solar radiation. The result was that the effects [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":772,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-771","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-redracc"],"_links":{"self":[{"href":"https:\/\/redracc.org\/index.php?rest_route=\/wp\/v2\/posts\/771","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/redracc.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/redracc.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/redracc.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/redracc.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=771"}],"version-history":[{"count":2,"href":"https:\/\/redracc.org\/index.php?rest_route=\/wp\/v2\/posts\/771\/revisions"}],"predecessor-version":[{"id":774,"href":"https:\/\/redracc.org\/index.php?rest_route=\/wp\/v2\/posts\/771\/revisions\/774"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/redracc.org\/index.php?rest_route=\/wp\/v2\/media\/772"}],"wp:attachment":[{"href":"https:\/\/redracc.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/redracc.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=771"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/redracc.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}