{"id":966,"date":"2025-01-07T10:47:36","date_gmt":"2025-01-07T10:47:36","guid":{"rendered":"https:\/\/braidingknowledgescanada.ca\/?post_type=completed_project&p=966"},"modified":"2025-05-01T16:20:07","modified_gmt":"2025-05-01T16:20:07","slug":"mineral-dust-dynamics-and-climate-change-at-high-latitude-mountainous-regions","status":"publish","type":"completed_project","link":"https:\/\/braidingknowledgescanada.ca\/fr\/completed_project\/mineral-dust-dynamics-and-climate-change-at-high-latitude-mountainous-regions\/","title":{"rendered":"Dynamique des particules min\u00e9rales et changement climatique dans les r\u00e9gions montagneuses de haute latitude"},"content":{"rendered":"
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Les travaux de recherche de ce p\u00f4le de connaissances sont maintenant termin\u00e9s!\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Lisez le r\u00e9sum\u00e9 final \u00e0 propos de ce p\u00f4le de recherche ci-dessous (cliquez pour ouvrir le PDF)<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Version fran\u00e7aise disponible ici<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Responsable de la recherche : James King (Universit\u00e9 de Montr\u00e9al)\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Les possibilit\u00e9s :<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tLes a\u00e9rosols atmosph\u00e9riques sont un m\u00e9lange complexe de compos\u00e9s inorganiques et organiques, donc la taille peut varier de quelques nanom\u00e8tres \u00e0 plusieurs microm\u00e8tres. Une fraction importante du bilan mondial total des a\u00e9rosols est constitu\u00e9e de particules min\u00e9rales, lesquelles augmentent le bilan radiatif atmosph\u00e9rique en r\u00e9fl\u00e9chissant ou en absorbant directement le rayonnement solaire, mais aussi indirectement, en agissant sur la condensation de nuages ou de noyaux de glace, ce qui a pour effet de modifier les propri\u00e9t\u00e9s nuageuses, comme l\u2019alb\u00e9do, la dur\u00e9e de vie et la quantit\u00e9 de pr\u00e9cipitations. Une fois d\u00e9pos\u00e9es, les particules min\u00e9rales peuvent se comporter comme un corps noir, ce qui augmente de mani\u00e8re disproportionn\u00e9e la fonte des surfaces enneig\u00e9es et fournit des nutriments essentiels aux \u00e9cosyst\u00e8mes. Aucune donn\u00e9e sur les \u00e9missions annuelles totales du Canada n\u2019est actuellement disponible malgr\u00e9 une estimation mondiale de 80-100 Tg par ann\u00e9e de particules min\u00e9rales provenant de sources de haute latitude.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Objectifs :<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tL\u2019\u00e9quipe a \u00e9tudi\u00e9 l\u2019influence des particules min\u00e9rales des r\u00e9gions de montagne sur les \u00e9cosyst\u00e8mes environnants au moyen d\u2019une s\u00e9rie de projets visant \u00e0 fournir des r\u00e9sultats pour mieux comprendre les impacts \u00e9cologiques et radiatifs des particules min\u00e9rales, ainsi que pour accro\u00eetre la capacit\u00e9 actuelle de mod\u00e9liser les changements dans le paysage et les \u00e9missions de particules min\u00e9rales dans des sc\u00e9narios de changement climatique futurs. Les objectifs de la recherche sont les suivants : (1) identifier les m\u00e9canismes qui produisent l\u2019\u00e9rosion \u00e9olienne des vall\u00e9es pro-glaciaires; (2) caract\u00e9riser les propri\u00e9t\u00e9s physiques, optiques et chimiques des particules min\u00e9rales en suspension dans l\u2019air et de celles d\u00e9pos\u00e9es dans les hautes latitudes; (3) \u00e9valuer l\u2019importance des apports nutritionnels provenant de d\u00e9p\u00f4t de particules min\u00e9rales sur les paysages environnants; et (4) \u00e9laborer et \u00e9valuer des mod\u00e8les de production de particules pour les r\u00e9gions de hautes latitudes.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Plan de recherche :<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tUne combinaison de mesures intensives sur le terrain, d\u2019analyses de t\u00e9l\u00e9d\u00e9tection, de d\u00e9veloppement de mod\u00e8les climatiques et de r\u00e9analyse pal\u00e9oclimatique ont fourni la base pour atteindre les objectifs de la recherche propos\u00e9e. Les campagnes sur le terrain ont eu lieu \u00e0 la limite sud des d\u00e9p\u00f4ts historiques de particules \u00e0 \u0141h\u00f9\u2019\u00e0\u00e0n M\u00e2n (lac Kluane), Yukon, fournissant un historique glaciaire des taux de d\u00e9p\u00f4t de particules min\u00e9rales et la r\u00e9cente augmentation spectaculaire des effets du changement climatique en raison d\u2019un changement complet du drainage fluvial ayant accru la fr\u00e9quence actuelle des \u00e9missions de particules min\u00e9rales. Les partenariats avec les groupes communautaires autochtones ont permis d\u2019\u00e9tablir les priorit\u00e9s parmi les objectifs et d\u2019en d\u00e9terminer le calendrier, tandis que les collaborations avec Parcs Canada et le gouvernement du Yukon ont facilit\u00e9 l\u2019int\u00e9gration de la m\u00e9thodologie propos\u00e9e aux recherches en cours sur le fonctionnement des \u00e9cosyst\u00e8mes lacustres.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Principaux r\u00e9sultats et impacts : \n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tL\u2019objectif de ce projet dirig\u00e9 par des chercheurs, appuy\u00e9 par des partenariats et soutenu par les communaut\u00e9s autochtones, est d\u2019identifier et de quantifier les variables climatiques qui contr\u00f4lent les \u00e9missions de particules des r\u00e9gions montagneuses, de les int\u00e9grer dans un nouveau mod\u00e8le de production de particules afin d\u2019\u00e9clairer le mod\u00e8le climatique mondial actuel d\u2019Environnement Canada (CanAM4) pour les \u00e9missions d\u2019a\u00e9rosols et de leur transport sous la forme de particules min\u00e9rales, et d\u2019\u00e9valuer les r\u00e9percussions actuelles et historiques des particules min\u00e9rales d\u00e9pos\u00e9es dans les paysages polaires environnants. \u2003\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Pr\u00e9sentation de 2020 : Dynamique des particules min\u00e9rales<\/a><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\tVid\u00e9o :<\/strong> Regardez cet extrait d\u2019un \u00e9pisode<\/a> sur le parc national Kluane tir\u00e9 de la s\u00e9rie de Radio-Canada \"Comment \u00e7a va le Nord?\" diffus\u00e9 sur Explora et disponible sur Tou.tv. Eva et Sophie, qui apparaissent dans l\u2019\u00e9pisode, sont toutes deux stagiaires du RCM !\n\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Autres membres de l\u2019\u00e9quipe :\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\tDaniel Fortier\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t(Universit\u00e9 de Montr\u00e9al)\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t Thora Herrmann\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t(Universit\u00e9 de Montr\u00e9al)\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\tPatrick Hayes\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t(Universit\u00e9 de Montr\u00e9al)\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t Daniel Nadeau\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t(Universit\u00e9 Laval)\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\tNorman O\u2019Neill\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t(Universit\u00e9 de Sherbrooke)\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\tJulie Talbot\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\t(Universit\u00e9 de Montr\u00e9al)\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

This Knowledge Hub is now complete! Read the final Knowledge Hub summary below (click to open the PDF) Version fran\u00e7aise disponible ici Principal Investigator: James King (University of Montr\u00e9al) Opportunity: Atmospheric aerosols are a complex mixture of inorganic and organic components and can range in size from a few nanometers to several micrometers. An important […]<\/p>\n","protected":false},"author":1,"featured_media":1161,"template":"elementor_header_footer","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-966","completed_project","type-completed_project","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nMineral Dust Dynamics and Climate Change at High Latitude Mountainous Regions - Braiding Knowledges Canada<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/braidingknowledgescanada.ca\/fr\/completed_project\/mineral-dust-dynamics-and-climate-change-at-high-latitude-mountainous-regions\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mineral Dust Dynamics and Climate Change at High Latitude Mountainous Regions - Braiding Knowledges Canada\" \/>\n<meta property=\"og:description\" content=\"This Knowledge Hub is now complete! Read the final Knowledge Hub summary below (click to open the PDF) Version fran\u00e7aise disponible ici Principal Investigator: James King (University of Montr\u00e9al) Opportunity: Atmospheric aerosols are a complex mixture of inorganic and organic components and can range in size from a few nanometers to several micrometers. 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