{"id":20697,"date":"2023-10-24T17:58:19","date_gmt":"2023-10-24T17:58:19","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/des-scientifiques-salarment-de-linevitable-fonte-acceleree-de-la-calotte-glaciaire-de-lantarctique-occidental"},"modified":"2023-10-24T19:34:18","modified_gmt":"2023-10-24T19:34:18","slug":"des-scientifiques-salarment-de-linevitable-fonte-acceleree-de-la-calotte-glaciaire-de-lantarctique-occidental","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/des-scientifiques-salarment-de-linevitable-fonte-acceleree-de-la-calotte-glaciaire-de-lantarctique-occidental","title":{"rendered":"Des scientifiques s\u2019alarment de l&rsquo;\u201din\u00e9vitable\u201d fonte acc\u00e9l\u00e9r\u00e9e de la calotte glaciaire de l\u2019Antarctique occidental"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span>La fonte des glaces de l\u2019Antarctique occidental devrait s\u2019acce\u0301le\u0301rer conside\u0301rablement au cours des prochaines de\u0301cennies et pourrait augmenter le niveau des mers, me\u0302me si le monde respecte ses engagements pour limiter le re\u0301chauffement climatique, selon une e\u0301tude publie\u0301e le 23 octobre 2023.<\/p>\n<p><b>Point de bascule climatique<\/b><\/p>\n<p>Les chercheurs du British Antarctic Survey, a\u0300 l\u2019origine de cette nouvelle e\u0301tude, ont averti que l\u2019humanite\u0301 avait \u201cperdu le contro\u0302le\u201d du sort des plateformes de glace, ces gigantesques structures gele\u0301es flottant en marge de l\u2019inlandsis principal et qui jouent un ro\u0302le stabilisateur en retenant la de\u0301rive et la fonte des glaciers dans l\u2019oce\u0301an.<\/p>\n<p>L\u2019Antarctique a de\u0301ja\u0300 connu une perte de glace acce\u0301le\u0301re\u0301e au cours des dernie\u0300res de\u0301cennies et les scientifiques ont de\u0301clare\u0301 que la calotte glaciaire de l\u2019Antarctique occidental \u2013 qui contient suffisamment d\u2019eau pour e\u0301lever le niveau des oce\u0301ans de plusieurs me\u0300tres \u2013 pourrait s\u2019approcher d\u2019un \u201cpoint de bascule\u201d climatique.<\/p>\n<p>Les chercheurs ont constate\u0301 \u2013 a\u0300 l\u2019aide d\u2019une mode\u0301lisation informatique \u2013 qu\u2019une fonte plus rapide des plateformes glaciaires est de\u0301ja\u0300 ine\u0301vitable dans les prochaines de\u0301cennies en raison du re\u0301chauffement des oce\u0301ans. Me\u0302me dans un sce\u0301nario ou\u0300 les e\u0301missions de gaz a\u0300 effet de serre (GES) sont re\u0301duites et ou\u0300 le re\u0301chauffement reste dans les limites de l\u2019objectif le plus ambitieux de l\u2019accord de Paris \u2013 a\u0300 savoir 1,5 degre\u0301 Celsius par rapport a\u0300 l\u2019e\u0300re pre\u0301industrielle -, leurs re\u0301sultats sont sensiblement identiques.<\/p>\n<p>L\u2019e\u0301tude, publie\u0301e dans la revue Nature Climate Change, s\u2019est inte\u0301resse\u0301e au processus de fonte par les eaux oce\u0301aniques du dessous des plateformes glaciaires flottantes de la mer d\u2019Amundsen. Me\u0302me dans le meilleur des cas, le re\u0301chauffement des oce\u0301ans pourrait s\u2019ave\u0301rer trois fois plus rapide au 21e sie\u0300cle qu\u2019au 20e sie\u0300cle.<\/p>\n<p>Kaitlin Naughten, auteure principale de l\u2019e\u0301tude, a affirme\u0301 que les chercheurs avaient \u201ctoutes les raisons de s\u2019attendre\u201d a\u0300 ce que la fonte des glaces contribue a\u0300 l\u2019e\u0301le\u0301vation du niveau de la mer \u2013 qui devrait de\u0301ja\u0300 atteindre un me\u0300tre d\u2019ici la fin du sie\u0300cle -, bien qu\u2019ils ne l\u2019aient pas e\u0301tudie\u0301e expresse\u0301ment. \u201cLa fonte de la plateforme glaciaire de l\u2019Antarctique occidental est l\u2019un des effets du changement climatique auquel nous devrons probablement nous adapter\u201d, estime-t-elle. Des millions de personnes a\u0300 travers la plane\u0300te vivent actuellement dans des zones co\u0302tie\u0300res de faible altitude et certaines \u201ccommunaute\u0301s co\u0302tie\u0300res devront soit construire aux alentours, soit e\u0302tre abandonne\u0301es\u201d, ajoute-t-elle.<\/p>\n<p><b>\u201cSignal d\u2019alarme\u201d<\/b><\/p>\n<p>Selon Alberto Naveira Garabato, professeur d\u2019oce\u0301anographie physique a\u0300 l\u2019Universite\u0301 de Southampton, cette e\u0301tude \u201cdonne a\u0300 re\u0301fle\u0301chir\u201d. \u201cCela illustre comment nos choix passe\u0301s ont probablement entrai\u0302ne\u0301 une fonte substantielle de l\u2019inlandsis de l\u2019Antarctique occidental et l\u2019e\u0301le\u0301vation du niveau de la mer qui en de\u0301coule, a\u0300 laquelle nous devrons ine\u0301vitablement nous adapter en tant que socie\u0301te\u0301 au cours des de\u0301cennies et des sie\u0300cles a\u0300 venir\u201d, a-t-il de\u0301clare\u0301 au Science Media Centre. Mais il souligne qu\u2019il s\u2019agit e\u0301galement d\u2019un \u201csignal d\u2019alarme\u201d pour re\u0301duire les e\u0301missions de GES afin d\u2019e\u0301viter d\u2019autres conse\u0301quences climatiques graves, notamment la fonte de la calotte glaciaire de l\u2019Antarctique oriental, actuellement conside\u0301re\u0301e comme plus stable.<\/p>\n<p>Les auteurs de l\u2019e\u0301tude rele\u0300vent que si une re\u0301duction majeure des e\u0301missions ne changerait pas grand-chose a\u0300 la perte de la calotte glaciaire de l\u2019Antarctique occidental au cours de ce sie\u0300cle, elle pourrait ne\u0301anmoins avoir un impact important a\u0300 plus long terme, puisque la calotte glaciaire mettra probablement des sie\u0300cles, voire des mille\u0301naires, a\u0300 re\u0301agir pleinement au changement climatique.<\/p>\n<p>Jonathan Bamber, professeur a\u0300 l\u2019e\u0301cole des sciences ge\u0301ographiques de l\u2019Universite\u0301 de Bristol, note que l\u2019e\u0301tude est quelque peu limite\u0301e parce que les chercheurs n\u2019ont utilise\u0301 qu\u2019un seul mode\u0300le oce\u0301anique et n\u2019ont pas explicitement e\u0301tudie\u0301 l\u2019effet du re\u0301chauffement des eaux sur le niveau des mers.<\/p>\n<p>\u201cCette partie de l\u2019Antarctique occidental contient suffisamment de glace pour faire monter le niveau de la mer de plus d\u2019un me\u0300tre. Il est donc important de comprendre comment elle e\u0301voluera dans l\u2019avenir\u201d, a de\u0301clare\u0301 au Science Media Centre M. Bamber, qui n\u2019a pas participe\u0301 a\u0300 la recherche.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/madagascar\">Madagascar<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Madagascar. La fonte des glaces de l\u2019Antarctique occidental devrait s\u2019acce\u0301le\u0301rer conside\u0301rablement au cours des prochaines de\u0301cennies et pourrait augmenter le niveau des mers, me\u0302me si le monde respecte ses engagements pour limiter le re\u0301chauffement climatique, selon une e\u0301tude publie\u0301e le 23 octobre 2023. Point de bascule climatique Les chercheurs du British Antarctic Survey, [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":20696,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,49],"class_list":["post-20697","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-madagascar","tag-madagascar"],"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>Des scientifiques s\u2019alarment de l&#039;\u201din\u00e9vitable\u201d fonte acc\u00e9l\u00e9r\u00e9e de la calotte glaciaire de l\u2019Antarctique occidental - Madagascar<\/title>\n<meta name=\"description\" content=\"La fonte des glaces de l\u2019Antarctique occidental devrait 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