{"id":40334,"date":"2021-09-02T09:53:30","date_gmt":"2021-09-02T13:53:30","guid":{"rendered":"https:\/\/www.uqac.ca\/?p=40334"},"modified":"2021-09-02T09:53:30","modified_gmt":"2021-09-02T13:53:30","slug":"leffondrement-des-societes-asiatiques-pendant-lholocene-explique-par-le-changement-du-climat","status":"publish","type":"post","link":"https:\/\/www.uqac.ca\/uqactualites\/2021\/09\/02\/leffondrement-des-societes-asiatiques-pendant-lholocene-explique-par-le-changement-du-climat\/","title":{"rendered":"L\u2019effondrement des soci\u00e9t\u00e9s asiatiques pendant l\u2019Holoc\u00e8ne expliqu\u00e9 par le changement du climat"},"content":{"rendered":"<p><a href=\"https:\/\/www.uqac.ca\/portfolio\/sergiorossi\/\">Sergio Rossi<\/a>, professeur en \u00e9cologie foresti\u00e8re au D\u00e9partement des sciences fondamentales de l\u2019UQAC a particip\u00e9 \u00e0 une \u00e9tude multidisciplinaire publi\u00e9e dans la revue Proceedings of the National Academy of Sciences of the United States of America (PNAS) sign\u00e9 par un groupe de 20 chercheurs provenant de 9 pays en Asie, en Europe et en Am\u00e9rique.<\/p>\n<p>L\u2019\u00e9tude consiste en une reconstruction climatique bas\u00e9e sur la relation entre les pr\u00e9cipitations et les isotopes stables des cernes de croissance des arbres du Plateau tib\u00e9tain en Chine. Les chercheurs ont produit une chronologie de pr\u00e9cipitation couvrant 6\u00a0700 ans (de 4\u00a0680 av J.-C. au pr\u00e9sent) qui d\u00e9montre la pr\u00e9sence de deux longues p\u00e9riodes de s\u00e9cheresse en 1\u00a0500 av J.-C et en 500 apr J.-C. Ces s\u00e9cheresses ont \u00e9t\u00e9 caus\u00e9es par une modification de l\u2019ensoleillement et, par cons\u00e9quent, de la configuration des Moussons, les masses d\u2019air humide estival qui d\u00e9terminent la v\u00e9g\u00e9tation fleurissante dans la partie m\u00e9ridionale de l\u2019Asie. L\u2019\u00e9tude a permis d\u2019expliquer le d\u00e9clin des \u00e9cosyst\u00e8mes forestiers, le changement de la production agricole du mil \u00e0 l\u2019orge, une plante qui est plus adapt\u00e9e \u00e0 des conditions s\u00e8ches, les migrations des peuples asiatiques pendant l\u2019Holoc\u00e8ne, et l\u2019effondrement de la dynastie chinoise Shang.<\/p>\n<p>Depuis 2015, Sergio Rossi collabore activement avec ses coll\u00e8gues chinois \u00e0 la r\u00e9alisation de projets sur les sciences foresti\u00e8res et l\u2019environnement dans le cadre d&rsquo;\u00e9changes de recherche entre le Canada et la Chine. L\u2019importance d\u2019une telle collaboration est confirm\u00e9e par la publication de cet article dans la revue de prestige PNAS.<\/p>\n<p><em>R\u00e9f\u00e9rence\u00a0: Yang B, Qin C, Br\u00e4uning A, Osborn TJ, Trouet V, Charpentier Ljungqvist F, Esper J, Schneider L, Grie\u00dfinger J, B\u00fcntgen U, Rossi S, Yan M, Wang J, Luterbacher J (2021) Long-term decrease in Asian monsoon rainfall and abrupt climate change events over the past 6,700 years. Proceedings of the National Academy of Sciences 118(30)\u00a0: e2102007118<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sergio Rossi, professeur en \u00e9cologie foresti\u00e8re au D\u00e9partement des sciences fondamentales de l\u2019UQAC a particip\u00e9 \u00e0 une \u00e9tude multidisciplinaire publi\u00e9e dans la revue Proceedings of the National Academy of Sciences of the United States of America (PNAS) sign\u00e9 par un groupe de 20 chercheurs provenant de 9 pays en Asie, en Europe et en Am\u00e9rique. [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":40335,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,4],"tags":[3],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>L\u2019effondrement des soci\u00e9t\u00e9s asiatiques pendant l\u2019Holoc\u00e8ne expliqu\u00e9 par le changement du climat - UQACtualit\u00e9s<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.uqac.ca\/uqactualites\/2021\/09\/02\/leffondrement-des-societes-asiatiques-pendant-lholocene-explique-par-le-changement-du-climat\/\" \/>\r\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"L\u2019effondrement des soci\u00e9t\u00e9s asiatiques pendant l\u2019Holoc\u00e8ne expliqu\u00e9 par le changement du climat - UQACtualit\u00e9s\" \/>\r\n<meta property=\"og:description\" content=\"Sergio Rossi, professeur en \u00e9cologie foresti\u00e8re au D\u00e9partement des sciences fondamentales de l\u2019UQAC a particip\u00e9 \u00e0 une \u00e9tude multidisciplinaire publi\u00e9e dans la revue Proceedings of the National Academy of Sciences of the United States of America (PNAS) sign\u00e9 par un groupe de 20 chercheurs provenant de 9 pays en Asie, en Europe et en Am\u00e9rique. 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