{"id":957,"date":"2013-04-09T19:14:39","date_gmt":"2013-04-09T19:14:39","guid":{"rendered":"http:\/\/lacdeschenes.ca\/?p=957"},"modified":"2014-08-18T14:34:57","modified_gmt":"2014-08-18T14:34:57","slug":"migration_nocturne_2013","status":"publish","type":"post","link":"https:\/\/naturecanada.ca\/fr\/news\/blog\/migration_nocturne_2013\/","title":{"rendered":"T\u00e9l\u00e9d\u00e9tection et les secrets de la migration nocturne"},"content":{"rendered":"<p><em>Un autre message publi\u00e9 \u00e0 l\u2019origine par Pascal C\u00f4t\u00e9 sur la liste de diffusion <a href=\"https:\/\/lists.b2b2c.ca\/mailman\/listinfo\/ornitho-qc\">Ornitho-Qu\u00e9bec<\/a> le 8 avril 2013.<\/em><\/p>\n<p>Voici une belle <a href=\"http:\/\/people.mbi.ohio-state.edu\/hurtado.10\/US_Composite_Radar\/2013-4-8\/\">animation de l&#8217;activit\u00e9 radar de la nuit derni\u00e8re<\/a> aux \u00c9tats-Unis.<\/p>\n<div id=\"attachment_913\" class=\"wp-caption alignleft\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-913\" class=\"size-medium wp-image-913\" src=\"https:\/\/naturecanada.ca\/wp-content\/uploads\/2013\/03\/Barn-swallow_Jane-Kirkland-300x194.jpg\" alt=\"Barn swallow_Jane Kirkland\" width=\"300\" height=\"194\" \/><p id=\"caption-attachment-913\" class=\"wp-caption-text\">Hirondelle rustique &#8211; Photo par Jane Kirkland<\/p><\/div>\n<p>Il y a certaines personnes qui m&#8217;ont demand\u00e9 comment on peut distinguer les oiseaux sur ces cartes. Dans le cas de l&#8217;animation pr\u00e9sent\u00e9e, on voit tr\u00e8s bien qu&#8217;un syst\u00e8me d\u00e9pressionnaire est en mouvement du mid-west vers les grands lacs. \u00c0 l&#8217;exception de ce syst\u00e8me, on voit appara\u00eetre des cercles (ou beignes) de couleur bleu sur un large territoire \u00e0 l&#8217;avant de ce syst\u00e8me et sur la c\u00f4te Atlantique. Ces cercles sont un ensemble de cibles en mouvement de basse r\u00e9flectivit\u00e9. En g\u00e9n\u00e9ral les cibles d\u00e9tect\u00e9s sont soit des oiseaux ou des insectes.\u00a0 Quand on tente de savoir si on a affaire \u00e0 une bonne soir\u00e9e de migration ou non, il faut rechercher ce type de cercles qui se forment \u00e0 l&#8217;alentour des radars. Un syst\u00e8me d\u00e9pressionnaire va toujours \u00eatre en mouvement alors que les oiseaux vont plut\u00f4t d\u00e9coller apr\u00e8s le coucher du soleil pour ensuite se d\u00e9placer. Puisqu&#8217;il s&#8217;agit de petites cibles de tr\u00e8s basse r\u00e9flectivit\u00e9, qui sont en nombres importants, on n&#8217;observe pas de mouvement \u00e0 proprement parl\u00e9 (si on compare aux pr\u00e9cipitations), mais plut\u00f4t des masses circulaires qui grandissent \u00e0 l&#8217;alentour des radars \u00e0 partir du coucher du soleil pour atteindre g\u00e9n\u00e9ralement un maximum vers 23h-minuit.<\/p>\n<p>Il est \u00e0 noter qu&#8217;il est impossible de voir le m\u00eame ph\u00e9nom\u00e8ne sur les radars canadiens car Environnement Canada traite les donn\u00e9es de mani\u00e8re \u00e0 voir seulement les pr\u00e9cipitations.<\/p>\n<p>Voil\u00e0!<\/p>\n<p>Pascal<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un autre message publi\u00e9 \u00e0 l\u2019origine par Pascal C\u00f4t\u00e9 sur la liste de diffusion Ornitho-Qu\u00e9bec le 8 avril 2013. Voici une belle animation de l&#8217;activit\u00e9 radar de la nuit derni\u00e8re aux \u00c9tats-Unis. Il y a certaines personnes qui m&#8217;ont demand\u00e9 comment on peut distinguer les oiseaux sur ces cartes. Dans le cas de l&#8217;animation pr\u00e9sent\u00e9e, [&hellip;]<\/p>\n","protected":false},"author":99,"featured_media":12229,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30],"tags":[],"class_list":["post-957","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>T\u00e9l\u00e9d\u00e9tection et les secrets de la migration nocturne - Nature 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:\/\/naturecanada.ca\/fr\/news\/blog\/migration_nocturne_2013\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u00e9l\u00e9d\u00e9tection et les secrets de la migration nocturne - Nature Canada\" \/>\n<meta property=\"og:description\" content=\"Un autre message publi\u00e9 \u00e0 l\u2019origine par Pascal C\u00f4t\u00e9 sur la liste de diffusion Ornitho-Qu\u00e9bec le 8 avril 2013. Voici une belle animation de l&#8217;activit\u00e9 radar de la nuit derni\u00e8re aux \u00c9tats-Unis. Il y a certaines personnes qui m&#8217;ont demand\u00e9 comment on peut distinguer les oiseaux sur ces cartes. 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