{"id":10896,"date":"2016-02-03T16:30:47","date_gmt":"2016-02-03T15:30:47","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=10896"},"modified":"2016-02-03T17:20:35","modified_gmt":"2016-02-03T16:20:35","slug":"les-arbres-ont-parle-les-romains-avaient-plus-chaud-que-nous-en-ete","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/les-arbres-ont-parle-les-romains-avaient-plus-chaud-que-nous-en-ete\/","title":{"rendered":"Les arbres ont parl\u00e9 : les Romains avaient plus chaud que nous en \u00e9t\u00e9"},"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 style=\"text-align: justify;\">La densit\u00e9 du bois au sein des anneaux de croissance des pins scandinaves fournit de nouvelles informations sur notre climat pass\u00e9. Les Romains pourraient, par exemple, avoir eu plus chaud que nous durant les mois d&rsquo;\u00e9t\u00e9. La Terre se serait \u00e9galement refroidie durant 2.000 ans, jusqu\u2019\u00e0 ce que l\u2019Homme commence \u00e0 lib\u00e9rer massivement des gaz \u00e0 effet de serre.<\/p>\n<p style=\"text-align: justify;\">Les anneaux de croissance observables dans des coupes de troncs d\u2019arbre (ou de grosses branches) fournissent de pr\u00e9cieuses informations sur les diff\u00e9rents climats du pass\u00e9. En effet, leurs tailles d\u00e9pendent fortement des variations saisonni\u00e8res de temp\u00e9ratures, les \u00e9t\u00e9s chauds sont par exemple marqu\u00e9s par des cernes plus larges. Gr\u00e2ce \u00e0 des analyses dendrochronologiques r\u00e9alis\u00e9es il y a quelques ann\u00e9es, des chercheurs avaient d\u00e9montr\u00e9 que notre climat avait peu chang\u00e9 au cours des deux derniers mill\u00e9naires, avant la r\u00e9volution industrielle.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" 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\n<p style=\"text-align: justify;\">Une nouvelle \u00e9tude, toujours bas\u00e9e sur l\u2019analyse des cernes de bois, remet maintenant ce r\u00e9sultat en cause. Selon Jan Esper de la Johannes Gutenberg University (Allemagne), l\u2019h\u00e9misph\u00e8re nord aurait subi un long refroidissement durant pr\u00e8s de 2.000 ans, approximativement \u00e0 partir de l\u2019\u00e9poque romaine. Ses travaux, pr\u00e9sent\u00e9s dans la revue Nature Climate Change, ont tenu compte de la densit\u00e9 du bois \u00e0 l\u2019int\u00e9rieur des anneaux de croissance. Par rapport aux pr\u00e9c\u00e9dentes estimations, l\u2019Angleterre aurait pu profiter d\u2019un climat plus chaud que pr\u00e9vu en \u00e9t\u00e9 au d\u00e9but de notre \u00e8re, ce qui justifierait le succ\u00e8s de la culture des vignes au nord de ce territoire par les Romains.<\/p>\n<p style=\"text-align: justify;\">Le climat pass\u00e9 r\u00e9v\u00e9l\u00e9 par des carottages de pins<\/p>\n<p style=\"text-align: justify;\">Des carottages ont \u00e9t\u00e9 r\u00e9alis\u00e9s par l\u2019\u00e9quipe de Jan Esper sur 537 pins sylvestres Pinus sylvestris vivants, ou sur des troncs immerg\u00e9s (parfois depuis plus de 1.500 ans), en Finlande et en Su\u00e8de. La densit\u00e9 du bois au sein des cernes a ensuite \u00e9t\u00e9 mesur\u00e9e gr\u00e2ce \u00e0 des techniques radiographiques utilisant les rayons X.<\/p>\n<p style=\"text-align: justify;\">extrait et source de <a href=\"http:\/\/www.futura-sciences.com\/magazines\/environnement\/infos\/actu\/d\/climatologie-arbres-ont-parle-romains-avaient-plus-chaud-nous-ete-39994\/\" target=\"_blank\">http:\/\/www.futura-sciences.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"10896\">(841)<\/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>La densit\u00e9 du bois au sein des anneaux de croissance des pins scandinaves fournit de nouvelles informations sur notre climat&#8230;<\/p>\n","protected":false},"author":1,"featured_media":10897,"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_post_was_ever_published":false,"_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":"Les arbres ont parl\u00e9 : les Romains avaient plus chaud que nous en \u00e9t\u00e9","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[33],"tags":[289,2438,2918,5506,5503,5505,5504,2439],"class_list":["post-10896","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","tag-arbres","tag-archeologie","tag-cernes","tag-dendrochronologiques","tag-pins","tag-pins-scandinaves","tag-pinus-sylvestris","tag-romains","wpcat-33-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/02\/cernes-arbres.jpg?fit=800%2C600&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-2PK","jetpack-related-posts":[{"id":19284,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-romains-avaient-plus-chaud-que-nous-en-ete\/","url_meta":{"origin":10896,"position":0},"title":"Les Romains avaient plus chaud que nous en \u00e9t\u00e9","author":"Admin","date":"17 juillet 2019","format":false,"excerpt":"La densit\u00e9 du bois au sein des anneaux de croissance des pins scandinaves fournit de nouvelles informations sur notre climat pass\u00e9. Les Romains pourraient, par exemple, avoir eu plus chaud que nous durant les mois d'\u00e9t\u00e9. La Terre se serait \u00e9galement refroidie durant 2.000 ans, jusqu'\u00e0 ce que l'Homme commence\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/06\/empire-romain.jpg?fit=1100%2C578&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/06\/empire-romain.jpg?fit=1100%2C578&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/06\/empire-romain.jpg?fit=1100%2C578&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/06\/empire-romain.jpg?fit=1100%2C578&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/06\/empire-romain.jpg?fit=1100%2C578&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":24613,"url":"https:\/\/www.laterredufutur.com\/accueil\/letude-des-arbres-suggere-que-les-huns-ont-ete-pousses-dans-leurs-conquetes-par-de-fortes-secheresses\/","url_meta":{"origin":10896,"position":1},"title":"L&rsquo;\u00e9tude des arbres sugg\u00e8re que les Huns ont \u00e9t\u00e9 pouss\u00e9s dans leurs conqu\u00eates par de fortes s\u00e9cheresses","author":"Admin","date":"27 d\u00e9cembre 2022","format":false,"excerpt":"Les arbres peuvent fournir aux scientifiques un moyen de remonter dans le pass\u00e9, r\u00e9v\u00e9lant tout, d'une inversion du champ magn\u00e9tique de la Terre il y a 42 000 ans jusqu'\u00e0 774 de notre \u00e8re, la plan\u00e8te a \u00e9t\u00e9 bombard\u00e9e par une temp\u00eate de radiations massive. Aujourd'hui, des chercheurs ont utilis\u00e9\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/12\/invasions-des-huns.jpg?fit=1024%2C683&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/12\/invasions-des-huns.jpg?fit=1024%2C683&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/12\/invasions-des-huns.jpg?fit=1024%2C683&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2022\/12\/invasions-des-huns.jpg?fit=1024%2C683&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":977,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-tendance-au-refroidissement-a-long-terme\/","url_meta":{"origin":10896,"position":2},"title":"Une tendance au refroidissement \u00e0 long terme","author":"Admin","date":"19 juillet 2012","format":false,"excerpt":"La dendrochronologie (datation par cercles des arbres) offre aux chercheurs des informations cl\u00e9s sur certains aspects des \u00e9cologies pass\u00e9es, telles que le climat. Prenant avantage de l'opportunit\u00e9 d'\u00e9valuer les cercles des arbres, une \u00e9quipe internationale de chercheurs a pu reconstituer le climat de l'Europe du nord au cours des 2000\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"nature climate","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/wordpress\/wp-content\/uploads\/2012\/07\/nature-climate.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":3487,"url":"https:\/\/www.laterredufutur.com\/accueil\/climat-au-pakistan-le-plus-humide-depuis-1-000-ans\/","url_meta":{"origin":10896,"position":3},"title":"Climat au Pakistan : le plus humide depuis 1 000 ans","author":"Admin","date":"25 mai 2006","format":false,"excerpt":"Une \u00e9quipe de chercheurs suisses et allemands vient d'apporter la preuve de la hausse significative, depuis la r\u00e9volution industrielle, des pr\u00e9cipitations dans la cha\u00eene montagneuse de Karakorum, au nord du Pakistan, plus que vraisemblablement due au r\u00e9chauffement plan\u00e9taire. L'\u00e9quipe, form\u00e9e de chercheurs de l'Institut de recherche suisse, du Centre de\u2026","rel":"","context":"Dans &quot;M\u00e9t\u00e9orologie&quot;","block_context":{"text":"M\u00e9t\u00e9orologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/meteorologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2006\/05\/pakistan.jpg?fit=250%2C270&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":20324,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-plus-vieille-foret-du-monde-a-ete-decouverte-dans-letat-de-new-york\/","url_meta":{"origin":10896,"position":4},"title":"La plus vieille for\u00eat du monde a \u00e9t\u00e9 d\u00e9couverte dans l&rsquo;\u00c9tat de New York","author":"Admin","date":"20 janvier 2020","format":false,"excerpt":"Des scientifiques ont indiqu\u00e9 avoir d\u00e9couvert dans l'\u00c9tat de New York ce qui pourrait \u00eatre la plus vieille for\u00eat du monde, potentiellement riche en enseignements sur les liens entre la for\u00eat et le climat, selon une \u00e9tude parue fin d\u00e9cembre 2019 dans le journal Current Biology. Le titre de plus\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":11830,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-petit-age-glaciaire-associe-a-la-peste-et-a-la-chute-des-empires-2\/","url_meta":{"origin":10896,"position":5},"title":"Le petit age glaciaire associ\u00e9 \u00e0 la peste et \u00e0 la chute des empires","author":"Admin","date":"29 avril 2016","format":false,"excerpt":"En 536, la premi\u00e8re des 3 \u00e9ruptions volcaniques massives a provoqu\u00e9 une p\u00e9riode que l'on connait comme le petit \u00e2ge glaciaire. Cette mini \u00e8re glaciaire a co\u00efncid\u00e9 avec une \u00e9pid\u00e9mie de peste, le d\u00e9clin de l\u2019Empire romain et des bouleversements majeurs en Eurasie. D\u00e9sormais, nous avons la premi\u00e8re preuve que\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/04\/empire-romain-volcan.jpg?fit=1000%2C541&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/04\/empire-romain-volcan.jpg?fit=1000%2C541&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/04\/empire-romain-volcan.jpg?fit=1000%2C541&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/04\/empire-romain-volcan.jpg?fit=1000%2C541&ssl=1&resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/10896","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=10896"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/10896\/revisions"}],"predecessor-version":[{"id":10898,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/10896\/revisions\/10898"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/10897"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=10896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=10896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=10896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}