{"id":5467,"date":"2026-01-06T16:00:16","date_gmt":"2026-01-06T15:00:16","guid":{"rendered":"https:\/\/martinique2050.com\/la-brume-de-sable-un-phenomene-subversif\/"},"modified":"2026-01-06T16:00:26","modified_gmt":"2026-01-06T15:00:26","slug":"la-brume-de-sable-un-phenomene-subversif","status":"publish","type":"post","link":"https:\/\/martinique2050.com\/en\/la-brume-de-sable-un-phenomene-subversif\/","title":{"rendered":"La brume de sable, un ph\u00e9nom\u00e8ne subversif"},"content":{"rendered":"<div class=\"entry-content\">\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-medium wp-image-945\" src=\"..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-300x225.jpg 300w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-768x576.jpg 768w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-1024x768.jpg 1024w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-810x608.jpg 810w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-1140x855.jpg 1140w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-150x113.jpg 150w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23897126_10211844505443007_2015327115_o-1-500x375.jpg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\"> <img decoding=\"async\" class=\"alignnone size-medium wp-image-944\" src=\"..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-300x225.jpg 300w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-768x576.jpg 768w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-1024x768.jpg 1024w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-810x608.jpg 810w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-1140x855.jpg 1140w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-150x113.jpg 150w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/23960923_10211844503162950_2094134888_o-500x375.jpg 500w\" sizes=\"(max-width: 300px) 100vw, 300px\"><\/p>\n<p><em>Apr\u00e8s quelques semaines de tr\u00eave, la brume de sable fait de nouveau son apparition. Lundi 20 novembre, le niveau d\u2019alerte est d\u00e9clench\u00e9, pass\u00e9 au rouge. L\u2019indice de l\u2019air est tr\u00e8s mauvais, il est de 9 sur l\u2019indice ATMO. Ces poussi\u00e8res, compos\u00e9es de particules fines, autrefois \u00e9taient p\u00e9riodiques (Avril \u00e0 Septembre). L\u2019ann\u00e9e 2017 n\u2019aura jamais autant connu d\u2019\u00e9pisodes de brume sable que les ann\u00e9es pr\u00e9c\u00e9dentes. Elles toucheraient \u00e9galement une partie de l\u2019Europe et bien plus de r\u00e9gions qu\u2019on y croit. Ces brumes \u00e0 r\u00e9p\u00e9tition posent la question de l\u2019impact sur l\u2019environnement et les effets sur le long terme. <\/em><\/p>\n<p><strong>La Brume de sable ne connait plus de saison<\/strong><\/p>\n<p>La Martinique est r\u00e9guli\u00e8rement touch\u00e9e par le ph\u00e9nom\u00e8ne naturel de \u00ab brume de sable \u00bb. Ce sable provient essentiellement du d\u00e9sert du Sahara et v\u00e9hicule des particules fines qui ne sont pas sans cons\u00e9quence sur la sant\u00e9 de l\u2019homme.<br \/>\nEn effet, lors d\u2019un \u00e9pisode de brume de sable, on constate une augmentation de min\u00e9raux argileux, de carbonates, de quartz dans l\u2019air. Le fer, le titane et le vanadium sont \u00e9galement des constituants des sables sahariens.<\/p>\n<p>L\u2019estimation des \u00e9missions globales de poussi\u00e8res varie entre 1000 et 3000 millions de tonnes par an dont la plus grande partie provient du d\u00e9sert du Sahara (de 500 \u00e0 1000 millions de tonnes par an).<\/p>\n<div id=\"attachment_918\" style=\"width: 361px\" class=\"wp-caption alignright\"><img decoding=\"async\" class=\"wp-image-918\" src=\"..\/wp-content\/uploads\/sites\/16\/2017\/11\/Capture-d-e%CC%81cran-2017-11-21-a%CC%80-13.07.43-300x163.png\" alt=\"D\u00e9placement des poussi\u00e8res dans l'atmosph\u00e8re\" width=\"351\" height=\"191\" srcset=\"..\/wp-content\/uploads\/sites\/16\/2017\/11\/Capture-d-e\u0301cran-2017-11-21-a\u0300-13.07.43-300x163.png 300w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/Capture-d-e\u0301cran-2017-11-21-a\u0300-13.07.43-768x416.png 768w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/Capture-d-e\u0301cran-2017-11-21-a\u0300-13.07.43-810x439.png 810w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/Capture-d-e\u0301cran-2017-11-21-a\u0300-13.07.43-150x81.png 150w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/Capture-d-e\u0301cran-2017-11-21-a\u0300-13.07.43-500x271.png 500w, ..\/wp-content\/uploads\/sites\/16\/2017\/11\/Capture-d-e\u0301cran-2017-11-21-a\u0300-13.07.43.png 880w\" sizes=\"(max-width: 351px) 100vw, 351px\"><\/p>\n<p class=\"wp-caption-text\">D\u00e9placement des poussi\u00e8res dans l\u2019atmosph\u00e8re<\/p>\n<\/div>\n<p>Les productions de poussi\u00e8res oscillaient g\u00e9n\u00e9ralement selon la saison :<\/p>\n<ul>\n<li>Janvier \u00e0 Mars, l\u2019activit\u00e9 augmente.<\/li>\n<li>La production est \u00e0 son plus haut niveau entre avril et juin.<\/li>\n<li>De juin \u00e0 septembre, certaines zones constituent une source de poussi\u00e8res alors que d\u2019autres sont relativement inactives.<\/li>\n<li>Octobre \u00e0 D\u00e9cembre, tr\u00e8s faible production de poussi\u00e8res.<\/li>\n<\/ul>\n<p><strong>Quels impacts sur l\u2019environnement?<\/strong><\/p>\n<p>Ces \u00e9v\u00e9nements peuvent avoir un impact sur l\u2019environnement. La poussi\u00e8re agit comme un bouclier emp\u00eachant la lumi\u00e8re du soleil d\u2019atteindre la surface. Ces grandes quantit\u00e9s de poussi\u00e8res peuvent maintenir les temp\u00e9ratures de surface de la mer jusqu\u2019\u00e0 1\u00b0 de moins que la moyenne. C\u2019est le cas \u00e9galement dans la r\u00e9gion principale de d\u00e9veloppement des cyclones partant de la c\u00f4te de l\u2019Afrique vers les cara\u00efbes. Cette r\u00e9action fournit des cyclones avec moins d\u2019\u00e9nergie pour se former et se d\u00e9velopper. La baisse de la temp\u00e9rature est l\u2019une des premi\u00e8res cons\u00e9quences de la brume de sable.<\/p>\n<p>La poussi\u00e8re modifie la formation des nuages et acc\u00e9l\u00e8re sa production des nuages. Elle aiderait potentiellement \u00e0 la formation et \u00e0 l\u2019intensification des cyclones. Elle peut aussi avoir l\u2019effet inverse ; une formation d\u2019ouragan quasi impossible \u00e0 cause du refroidissement des temp\u00e9ratures de surface de la mer. Dans ce cas pr\u00e9cis, il faudrait que la brume de sable agisse pour que les nuages se situent au plus bas niveau sur l\u2019Atlantique tropical, ce qui r\u00e9duira la quantit\u00e9 de lumi\u00e8re solaire atteignant la mer.<\/p>\n<p>Cette brume de sable a \u00e9galement une influence sur la productivit\u00e9 marine et est facteur d\u2019acc\u00e9l\u00e9ration de l\u2019aridification. Sur l\u2019activit\u00e9 humaine, elle provoquerait une perturbation des vols a\u00e9riens et des accidents, sans compter les nombreux effets n\u00e9fastes sur la sant\u00e9.<\/p>\n<p>Il existe tr\u00e8s peu d\u2019\u00e9tudes sur l\u2019impact environnemental que peuvent g\u00e9n\u00e9rer ces poussi\u00e8res, juste quelques constats. Une chose est s\u00fbre, elle peut et a d\u00e9j\u00e0 affect\u00e9 l\u2019activit\u00e9 cyclonique.<\/p>\n<p>Les journ\u00e9es au ciel bleu sont de plus en plus rares. A ce ph\u00e9nom\u00e8ne s\u2019ajoute la pollution automobile, la pollution li\u00e9e aux sargasses. Certains m\u00e9decins soul\u00e8vent la question du port du masque comme on le voit d\u00e9j\u00e0 en Chine. Pour les Antilles, il s\u2019agirait de masques plus importants prot\u00e9geant des micro particules. La brume de sable, ce ph\u00e9nom\u00e8ne est toujours en \u00e9tude de composition chimique, ce qui devrait permettre d\u2019\u00e9tayer des \u00e9tudes sanitaires.<\/p>\n<p>Bianca<\/p>\n<p>\u00a0<\/p>\n<p>Sources : Institut de veille sanitaire, Madininair, Skiron, M\u00e9t\u00e9o France<\/p>\n<\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>Apr\u00e8s quelques semaines de tr\u00eave, la brume de sable fait de nouveau son apparition. Lundi 20 novembre, le niveau d\u2019alerte est d\u00e9clench\u00e9, pass\u00e9 au rouge. L\u2019indice de l\u2019air est tr\u00e8s mauvais, il est de 9 sur l\u2019indice ATMO. Ces poussi\u00e8res, compos\u00e9es de particules fines, autrefois \u00e9taient p\u00e9riodiques (Avril \u00e0 Septembre). L\u2019ann\u00e9e 2017 n\u2019aura jamais autant &hellip;<\/p>","protected":false},"author":1,"featured_media":5468,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","footnotes":""},"categories":[1589],"tags":[2205,2207,1244,1375],"class_list":["post-5467","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-eau","tag-air","tag-brume-de-sable","tag-martinique","tag-pollution"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La brume de sable, un ph\u00e9nom\u00e8ne subversif - martinique2050<\/title>\n<meta name=\"description\" content=\"Apr\u00e8s quelques semaines de tr\u00eave, la brume de sable fait de nouveau son apparition. 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