{"id":2553,"date":"2004-11-29T19:46:09","date_gmt":"2004-11-29T17:46:09","guid":{"rendered":"http:\/\/www.laterredufutur.com\/wordpress\/?p=2553"},"modified":"2015-04-02T19:48:44","modified_gmt":"2015-04-02T17:48:44","slug":"larctique-fond-a-cause-de-larctique-mais","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/larctique-fond-a-cause-de-larctique-mais\/","title":{"rendered":"L&rsquo;Arctique fond \u00e0 cause de l&rsquo;Arctique, mais&#8230;"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>En d\u00e9gelant \u00e0 cause du r\u00e9chauffement de la plan\u00e8te, l&rsquo;Arctique d\u00e9gagerait du gaz carbonique et du m\u00e9thane, deux facteurs responsables de l&rsquo;effet de serre. Svein Tveitdal a fait sensation lors de la 21e session du conseil d&rsquo;administration du Programme des Nations Unies pour l&rsquo;environnement (PNUE), qui s&rsquo;est d\u00e9roul\u00e9e \u00e0 Nairobi (Kenya).<\/p>\n<p>Et pour cause : il a expliqu\u00e9 \u00e0 l&rsquo;assistance que le permafrost (sol gel\u00e9 en permanence depuis des milliers d&rsquo;ann\u00e9es) de l&rsquo;Arctique, en fondant sous l&rsquo;effet du r\u00e9chauffement de la plan\u00e8te, mettait \u00e0 jour des restes d&rsquo;animaux et de v\u00e9g\u00e9taux. Or, en se d\u00e9gradant, cette biomasse d\u00e9gage du gaz carbonique et du m\u00e9thane contribuant ainsi \u00e0 amplifier l&rsquo;effet de serre.<\/p>\n<p>En somme, la Terre serait donc entr\u00e9e dans un cercle vicieux, entretenant son r\u00e9chauffement. Mais, cit\u00e9 par Cybersciences, Svein Tveitdal, ram\u00e8ne cette information \u00e0 de justes proportions, sans toutefois minimiser ses propos : \u00ab\u00a015 % du r\u00e9chauffement actuel serait d\u00fb \u00e0 la d\u00e9composition ou \u00e0 la combustion de mati\u00e8re organique, et le sol arctique contient 15 % du carbone de la plan\u00e8te.\u00a0\u00bb<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/artique1.jpg\" alt=\"\" \/><\/p>\n<p>Bref, pas de quoi, non plus, innocenter les industriels et l&rsquo;automobile. Lorsque la temp\u00e9rature se r\u00e9chauffe, elle \u00ab r\u00e9veille \u00bb cette biomasse de son long sommeil, c&rsquo;est-\u00e0-dire entra\u00eene sa d\u00e9composition : en se d\u00e9gradant, ces plantes et ces b\u00eates \u00e9mettent du gaz carbonique (CO2) et du m\u00e9thane, deux gaz qui contribuent \u00e0 l&rsquo;effet de serre. De plus, pr\u00e9cise-t-il, \u00ab certains estiment qu&rsquo;une augmentation de la temp\u00e9rature arctique d&rsquo;\u00e0 peine 2 degr\u00e9s Celsius diminuerait de 16% la surface du permafrost.<\/p>\n<p>C&rsquo;est bien assez, conclut ce chercheur norv\u00e9gien, pour acc\u00e9l\u00e9rer un r\u00e9chauffement de la plan\u00e8te d\u00e9j\u00e0 beaucoup plus rapide qu&rsquo;on le pr\u00e9voyait&#8230; \u00bb On rappelle qu&rsquo;un apport d&rsquo;eau douce dans l&rsquo;oc\u00e9an Atlantique est en train d&rsquo;affaiblir le Gulf Stream. Ainsi on peut d\u00e9j\u00e0 estimer qu&rsquo;il a chut\u00e9 de 20 %<\/p>\n<p>Sources : http:\/\/www.cybersciences.com\/<\/p>\n<p>&nbsp;<\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"2553\">(398)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>En d\u00e9gelant \u00e0 cause du r\u00e9chauffement de la plan\u00e8te, l&rsquo;Arctique d\u00e9gagerait du gaz carbonique et du m\u00e9thane, deux facteurs responsables&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2521,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[20],"tags":[298,41,2420],"class_list":["post-2553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climat","tag-arctique","tag-climat","tag-fond","wpcat-20-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/03\/.._galerie_albums_userpics_10001_normal_photodujour181.jpg?fit=500%2C375&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-Fb","jetpack-related-posts":[{"id":27379,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dun-interrupteur-de-methane-dans-locean-arctique-qui-a-contribue-au-rechauffement-climatique-rapide\/","url_meta":{"origin":2553,"position":0},"title":"D\u00e9couverte d&rsquo;un \u00ab interrupteur \u00bb de m\u00e9thane dans l&rsquo;oc\u00e9an Arctique qui a contribu\u00e9 au r\u00e9chauffement climatique rapide","author":"Admin","date":"23 octobre 2025","format":false,"excerpt":"L\u2019oc\u00e9an Arctique \u00e9tait autrefois une source importante de gaz \u00e0 effet de serre dans l\u2019atmosph\u00e8re \u2014 et il pourrait le redevenir, avertissent les chercheurs. L\u2019oc\u00e9an Arctique \u00e9tait autrefois une source importante de gaz \u00e0 effet de serre dans l\u2019atmosph\u00e8re \u2014 et il pourrait le redevenir, avertissent les chercheurs. Le m\u00e9thane\u2026","rel":"","context":"Dans &quot;Pollution&quot;","block_context":{"text":"Pollution","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/pollution\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/tdf-artic.jpg?fit=1200%2C788&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/tdf-artic.jpg?fit=1200%2C788&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/tdf-artic.jpg?fit=1200%2C788&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/tdf-artic.jpg?fit=1200%2C788&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/tdf-artic.jpg?fit=1200%2C788&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":3259,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-clathrates-energie-du-futur-ou-bombe-a-retardement-climatique\/","url_meta":{"origin":2553,"position":1},"title":"Les clathrates, \u00e9nergie du futur ou bombe \u00e0 retardement climatique ?","author":"Admin","date":"15 janvier 2006","format":false,"excerpt":"Les clathrates, \u00e9galement appel\u00e9es hydrates de gaz ou de m\u00e9thane renferment d\u2019importantes quantit\u00e9 de m\u00e9thane, une source d\u2019\u00e9nergie qui pourrait \u00eatre exploit\u00e9e mais qui pr\u00e9sente \u00e9galement une s\u00e9rieuse menace pour l\u2019avenir climatique de notre plan\u00e8te. D\u00e9couverte et structure D\u00e9couverts dans les ann\u00e9es 70 lors de forages p\u00e9troliers, les r\u00e9serves de\u2026","rel":"","context":"Dans &quot;Pollution&quot;","block_context":{"text":"Pollution","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/pollution\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/methane-hydrate.jpeg?fit=300%2C244&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":2911,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-hydrates-de-methane\/","url_meta":{"origin":2553,"position":2},"title":"Les hydrates de m\u00e9thane","author":"Admin","date":"18 mai 2005","format":false,"excerpt":"On a d\u00e9couvert il n'y a pas tr\u00e8s longtemps l'existence d'un nouveau stock de carbone fossile : l'hydrate de m\u00e9thane. Il s'agit d'un compos\u00e9 qui ressemble \u00e0 de la glace et qui se forme quand du m\u00e9thane (composant principal du gaz naturel, et par ailleurs gaz \u00e0 effet de serre)\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/spaw\/images\/1099.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":3022,"url":"https:\/\/www.laterredufutur.com\/accueil\/anomalies-en-question\/","url_meta":{"origin":2553,"position":3},"title":"Anomalies en Question","author":"Admin","date":"31 ao\u00fbt 2005","format":false,"excerpt":"Texte \u00e9crit et transmis par Jean-Seb : Je poursuis mes r\u00e9flexions et recherche sur les questions d'anomalies de temp\u00e9ratures que je prends d'autant plus au s\u00e9rieux qu'elles me semblent devenir r\u00e9currentes. C'est s\u00fbr que les anomalies de temp\u00e9rature, tr\u00e8s \u00e9lev\u00e9es au nord des p\u00f4les de mani\u00e8re r\u00e9currente, et souvent faiblement\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3343,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-majeure-partie-du-permafrost-arctique-pourrait-disparaitre\/","url_meta":{"origin":2553,"position":4},"title":"La majeure partie du permafrost arctique pourrait dispara\u00eetre","author":"Admin","date":"3 mars 2006","format":false,"excerpt":"Le r\u00e9chauffement global pourrait venir \u00e0 bout des 3 m\u00e8tres ou plus d\u2019\u00e9paisseur du sol perp\u00e9tuellement gel\u00e9 de l\u2019h\u00e9misph\u00e8re nord, endommageant aussi bien les \u00e9cosyst\u00e8mes que les b\u00e2timents et les routes du Canada, de l\u2019Alaska et de la Russie. De nouvelles simulations du centre national pour la recherche atmosph\u00e9rique (NCAR)\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":4630,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-bombe-au-pole-nord\/","url_meta":{"origin":2553,"position":5},"title":"Une bombe au P\u00f4le Nord","author":"Admin","date":"8 octobre 2008","format":false,"excerpt":"(Agence Science-Presse) - En quelques jours, des millions de tonnes de m\u00e9thane se sont ajout\u00e9s au total de ce qui envahira notre ciel. Coup sur coup, deux navires explorant le Grand Nord, ind\u00e9pendants l\u2019un de l\u2019autre, ont renvoy\u00e9 vers la civilisation un avant-go\u00fbt de son inconscience. C\u2019est d\u2019abord d\u2019un navire\u2026","rel":"","context":"Dans &quot;Pollution&quot;","block_context":{"text":"Pollution","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/pollution\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2008\/10\/methane.jpg?fit=300%2C225&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/2553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=2553"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/2553\/revisions"}],"predecessor-version":[{"id":2554,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/2553\/revisions\/2554"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/2521"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=2553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=2553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=2553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}