{"id":70552,"date":"2025-08-12T11:00:00","date_gmt":"2025-08-12T11:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/?p=70552"},"modified":"2025-08-12T08:43:46","modified_gmt":"2025-08-12T08:43:46","slug":"degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes","title":{"rendered":"D\u00e9gel du Perg\u00e9lisol en Sib\u00e9rie Cr\u00e9e des Bosses Intrigantes"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>En cette fin d\u2019hiver, il fait -20\u00b0C et le paysage champe\u0302tre de Iakoutie, dans l\u2019Extre\u0302me-Orient russe, est sature\u0301 de ces monticules forme\u0301s par un processus appele\u0301 thermokarst. Les polygones, nomme\u0301s \u00ab bylars \u00bb en langue iakoute, mesurent plus d\u2019un me\u0300tre de hauteur et ont des formes presque re\u0301gulie\u0300res.<\/p>\n<p><b>\u00ab Au cours des quarante dernie\u0300res anne\u0301es, on a commence\u0301 a\u0300 voir ce paysage se bosseler \u00bb<\/b><\/p>\n<p>Ils ne sont pas nouveaux, mais ils se multiplient a\u0300 la faveur du changement climatique et du de\u0301gel acce\u0301le\u0301re\u0301 du perge\u0301lisol, ce sol en the\u0301orie perpe\u0301tuellement gele\u0301 et aussi appele\u0301 permafrost, explique Nikita Tananaev, directeur du laboratoire du climat de l\u2019Universite\u0301 fe\u0301de\u0301rale du Nord-Est a\u0300 Iakoutsk, la capitale de la Iakoutie, immense re\u0301gion presque entie\u0300rement couverte par le perge\u0301lisol.<\/p>\n<p>\u00ab Le sommet de ces formations reste stable. Seuls les espaces entre les monticules s\u2019enfoncent \u00bb, poursuit-il. Car la glace souterraine qui fond e\u0301tant dispose\u0301e en polygones, c\u2019est son de\u0301gel qui cre\u0301e les bosses. \u00ab Et avec le re\u0301chauffement climatique, la glace fond de plus en plus vite \u00bb.<\/p>\n<p>Les monticules essaiment jusque dans les villes. Dans le gros bourg de Tchouraptcha, a\u0300 135 kilome\u0300tres de Iakoutsk, le terrain d\u2019Innokenti Posselski comptait 20 bosses lorsqu\u2019il l\u2019a achete\u0301 l\u2019an dernier pour y construire sa maison.<\/p>\n<p>\u00ab Il y a une quarantaine d\u2019anne\u0301es, il y avait un ae\u0301rodrome ici et le terrain e\u0301tait assez plat \u00bb, raconte M. Posselski, 34 ans. \u00ab Au cours des quarante dernie\u0300res anne\u0301es, on a commence\u0301 a\u0300 voir ce paysage se bosseler. C\u2019est comme c\u0327a partout ici. \u00bb<\/p>\n<p>Le jeune homme n\u2019a pour l\u2019instant nivele\u0301 que la moitie\u0301 de son terrain. Sa maison tient debout sur des pilotis profonde\u0301ment enfonce\u0301s dans le permafrost, comme tous les ba\u0302timents de la re\u0301gion. Car en Iakoutie, qu\u2019ils soient d\u2019habitation ou de commerce, la quasi-totalite\u0301 des ba\u0302timents sont monte\u0301s sur des pieux qui descendent a\u0300 plusieurs me\u0300tres dans le sol gele\u0301.<\/p>\n<p><b>\u00ab La tempe\u0301rature la plus e\u0301leve\u0301e jamais observe\u0301e \u00bb<\/b><\/p>\n<p>Mais le de\u0301gel durable a de\u0301ja\u0300 des conse\u0301quences bien visibles: a\u0300 Iakoutsk, les murs de certains immeubles s\u2019affaissent et se le\u0301zardent. Mikhai\u0308l Kouznetsov, patron de l\u2019Agence fe\u0301de\u0301rale pour le de\u0301veloppement de l\u2019Orient russe, indiquait en 2024 que \u00ab plus de 40% \u00bb des ba\u0302timents situe\u0301s en zone de perge\u0301lisol \u2014 qui couvre 65% de la Russie \u2014 e\u0301taient de\u0301forme\u0301s en raison du de\u0301gel.<\/p>\n<p>La faute en revient a\u0300 l\u2019augmentation des tempe\u0301ratures moyennes qui ont grimpe\u0301 de \u00ab 1,5\u00b0C au cours des 30 dernie\u0300res anne\u0301es \u00bb en Iakoutie et \u00ab me\u0302me jusqu\u2019a\u0300 2\u00b0C par endroits \u00bb, selon Nikita Tananaev du laboratoire du climat a\u0300 Iakoutsk.<\/p>\n<p>Pour preuve: il a fait -8\u00b0C en janvier a\u0300 Iakoutsk, soit \u00ab la tempe\u0301rature la plus e\u0301leve\u0301e jamais observe\u0301e \u00bb en janvier dans cette re\u0301gion ou\u0300 le thermome\u0300tre descend en moyenne a\u0300 -40\u00b0C pendant le premier mois de l\u2019anne\u0301e.<\/p>\n<p>Ces chiffres refle\u0300tent les statistiques des observatoires mondiaux: les deux dernie\u0300res anne\u0301es \u2014 2023 et 2024 \u2014 ont e\u0301te\u0301 les plus chaudes jamais mesure\u0301es, et sans doute les plus chaudes sur terre depuis 120.000 ans, selon des \u00ab archives climatiques \u00bb telles que les carottes de glace. Un re\u0301chauffement largement cause\u0301 par la combustion des e\u0301nergies fossiles, la Russie e\u0301tant par ailleurs le cinquie\u0300me e\u0301metteur mondial de gaz a\u0300 effet de serre.<\/p>\n<p>\u00ab Une diffe\u0301rence d\u2019un ou deux degre\u0301s Celsius, me\u0302me si les tempe\u0301ratures sont ne\u0301gatives, est tre\u0300s importante en termes scientifiques car le perge\u0301lisol ne ge\u0300le pas aussi profonde\u0301ment que d\u2019habitude \u00bb, explique Alexandre Makarov, directeur de l\u2019Institut de recherche sur l\u2019Arctique et l\u2019Antarctique a\u0300 Saint-Pe\u0301tersbourg.<\/p>\n<p>Pour saisir l\u2019ampleur du proble\u0300me, l\u2019Institut a de\u0301ploye\u0301 ces deux dernie\u0300res anne\u0301es 78 puits d\u2019observation du de\u0301gel du permafrost dans douze re\u0301gions de Russie. A terme, il compte en installer 140.<\/p>\n<p>Mais le de\u0301gel libe\u0300re aussi davantage de dioxyde de carbone (CO2) et de me\u0301thane, deux gaz a\u0300 effet de serre emprisonne\u0301s dans les glaces depuis des mille\u0301naires. Un phe\u0301nome\u0300ne qui alimente un cercle vicieux en aggravant le re\u0301chauffement climatique, acce\u0301le\u0301rant par la\u0300-me\u0302me le de\u0301gel du perge\u0301lisol. Outre ses effets climatiques, la fonte du permafrost, qui abrite des bacte\u0301ries et virus parfois oublie\u0301s, repre\u0301sente une menace sanitaire.<\/p>\n<p>En 2016, un enfant est mort en Sibe\u0301rie de la maladie du charbon (anthrax), pourtant disparue depuis 75 ans dans cette re\u0301gion. Pour les scientifiques, l\u2019origine remontait tre\u0300s probablement au de\u0301gel d\u2019un cadavre de renne mort de l\u2019anthrax il y a plusieurs dizaines d\u2019anne\u0301es.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. En cette fin d\u2019hiver, il fait -20\u00b0C et le paysage champe\u0302tre de Iakoutie, dans l\u2019Extre\u0302me-Orient russe, est sature\u0301 de ces monticules forme\u0301s par un processus appele\u0301 thermokarst. Les polygones, nomme\u0301s \u00ab bylars \u00bb en langue iakoute, mesurent plus d\u2019un me\u0300tre de hauteur et ont des formes presque re\u0301gulie\u0300res. \u00ab Au cours des [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":70551,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-70552","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>D\u00e9gel du Perg\u00e9lisol en Sib\u00e9rie Cr\u00e9e des Bosses Intrigantes - Senegal<\/title>\n<meta name=\"description\" content=\"En cette fin d\u2019hiver, il fait -20\u00b0C et le paysage champe\u0302tre de Iakoutie, dans l\u2019Extre\u0302me-Orient russe, est sature\u0301 de c ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9gel du Perg\u00e9lisol en Sib\u00e9rie Cr\u00e9e des Bosses Intrigantes\" \/>\n<meta property=\"og:description\" content=\"En cette fin d\u2019hiver, il fait -20\u00b0C et le paysage champe\u0302tre de Iakoutie, dans l\u2019Extre\u0302me-Orient russe, est sature\u0301 de c ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-08-12T11:00:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/08\/sm_1755014118.515324.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"D\u00e9gel du Perg\u00e9lisol en Sib\u00e9rie Cr\u00e9e des Bosses Intrigantes\",\"datePublished\":\"2025-08-12T11:00:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes\"},\"wordCount\":862,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/08\/sm_1755014118.515324.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/degel-du-pergelisol-en-siberie-cree-des-bosses-intrigantes\",\"name\":\"D\u00e9gel du Perg\u00e9lisol en Sib\u00e9rie Cr\u00e9e des Bosses Intrigantes - 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