{"id":186978,"date":"2025-06-30T21:18:29","date_gmt":"2025-06-30T19:18:29","guid":{"rendered":"https:\/\/candas365.es\/noticias\/?p=186978"},"modified":"2025-06-30T21:18:29","modified_gmt":"2025-06-30T19:18:29","slug":"el-oceano-antartico-se-deshiela","status":"publish","type":"post","link":"https:\/\/candas365.es\/noticias\/el-oceano-antartico-se-deshiela\/","title":{"rendered":"El oc\u00e9ano Ant\u00e1rtico se deshiela"},"content":{"rendered":"<p>Un equipo de investigadores ha descubierto que el oc\u00e9ano Ant\u00e1rtico se est\u00e1 volviendo m\u00e1s salado en su superficie, lo que incrementa su deshielo.<\/p>\n<figure id=\"attachment_186979\" aria-describedby=\"caption-attachment-186979\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-large wp-image-186979\" src=\"https:\/\/candas365.es\/noticias\/wp-content\/uploads\/2025\/06\/Antartico-650x436.jpg\" alt=\"Ant\u00e1rtico\" width=\"650\" height=\"436\" srcset=\"https:\/\/candas365.es\/noticias\/wp-content\/uploads\/2025\/06\/Antartico-650x436.jpg 650w, https:\/\/candas365.es\/noticias\/wp-content\/uploads\/2025\/06\/Antartico-360x241.jpg 360w, https:\/\/candas365.es\/noticias\/wp-content\/uploads\/2025\/06\/Antartico-768x515.jpg 768w, https:\/\/candas365.es\/noticias\/wp-content\/uploads\/2025\/06\/Antartico-150x101.jpg 150w, https:\/\/candas365.es\/noticias\/wp-content\/uploads\/2025\/06\/Antartico-450x302.jpg 450w, https:\/\/candas365.es\/noticias\/wp-content\/uploads\/2025\/06\/Antartico.jpg 983w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/><figcaption id=\"caption-attachment-186979\" class=\"wp-caption-text\">Hielo marino | Foto de Universidad de Southampton<\/figcaption><\/figure>\n<p>As\u00ed lo explican en un estudio publicado este lunes en la revista \u2018Proceedings of the National Academy of Sciences\u2019 y firmado por autores de Alemania, Espa\u00f1a, Estados Unidos, Italia, Reino Unido y Suecia.<\/p>\n<p>Entre los firmantes est\u00e1n Estrella Olmedo, Ver\u00f3nica Gonz\u00e1lez y Antonio Turiel, del Instituto de Ciencias del Mar, perteneciente al Consejo Superior de Investigaciones Cient\u00edficas (CSIC), y Rafael Catany, de Albavalor.<\/p>\n<p>Desde 2015, la Ant\u00e1rtida ha perdido una cantidad de hielo marino equivalente al tama\u00f1o de Groenlandia, el mayor cambio ambiental observado en la Tierra en las \u00faltimas d\u00e9cadas. <strong>El Ant\u00e1rtico tambi\u00e9n se est\u00e1 volviendo m\u00e1s salado, y este cambio inesperado est\u00e1 agravando el problema.<\/strong><\/p>\n<p>Durante d\u00e9cadas, la superficie del oc\u00e9ano Ant\u00e1rtico se enfri\u00f3 y se volvi\u00f3 menos salada, lo que favoreci\u00f3 el crecimiento del hielo marino. Ahora, los cient\u00edficos afirman que esa tendencia se ha revertido dr\u00e1sticamente.<\/p>\n<p>Utilizando datos satelitales europeos, la investigaci\u00f3n, dirigida por la Universidad de Southampton (Reino Unido), ha descubierto un aumento repentino de la salinidad de la superficie al sur de los grados 50 de latitud.<\/p>\n<p>Esto ha coincidido con una dram\u00e1tica p\u00e9rdida de hielo marino alrededor de la Ant\u00e1rtida y el resurgimiento de la polinia Maud Rise en el mar de Weddell, un enorme agujero en el hielo marino de casi cuatro veces el tama\u00f1o de Gales, que no hab\u00eda ocurrido desde la d\u00e9cada de 1970.<\/p>\n<p>\u201cEl agua superficial m\u00e1s salada facilita el ascenso del calor en las profundidades oce\u00e1nicas, derritiendo el hielo marino desde abajo. Es un peligroso c\u00edrculo vicioso: menos hielo genera m\u00e1s calor, lo que a su vez genera a\u00fan menos hielo\u201d, explica Alessandro Silvano, de la Universidad de Southampton.<\/p>\n<h2>POLINIA U OC\u00c9ANO ABIERTO<\/h2>\n<p>El regreso de la polinia en la elevaci\u00f3n Maud indica lo inusuales que son las condiciones actuales. Si este estado salado y con poco hielo contin\u00faa, podr\u00eda transformar permanentemente el Ant\u00e1rtico y, con \u00e9l, el planeta.<\/p>\n<p>Los efectos ya son globales: <a href=\"https:\/\/candas365.es\/noticias\/category\/el-tiempo\/\"><span style=\"color: #ff6600;\"><strong>tormentas m\u00e1s intensas<\/strong><\/span><\/a>, oc\u00e9anos m\u00e1s c\u00e1lidos y la reducci\u00f3n de los h\u00e1bitats para los ping\u00fcinos y otros animales emblem\u00e1ticos de la Ant\u00e1rtida.<\/p>\n<p>En estas aguas polares, el agua superficial fr\u00eda y dulce se superpone a las aguas m\u00e1s c\u00e1lidas y saladas de las profundidades. En invierno, a medida que la superficie se enfr\u00eda y se forma hielo marino, la diferencia de densidad (estratificaci\u00f3n) entre las capas de agua se debilita, lo que permite que estas se mezclen y que el calor se transporte hacia arriba, derritiendo el hielo marino desde abajo y limitando su crecimiento.<\/p>\n<p>Desde principios de la d\u00e9cada de 1980, la superficie del Ant\u00e1rtico se ha ido enfriando y la estratificaci\u00f3n se ha fortalecido, atrapando el calor debajo y sosteniendo una mayor cobertura de hielo marino.<\/p>\n<p>Ahora, una nueva tecnolog\u00eda satelital, combinada con informaci\u00f3n proveniente de dispositivos rob\u00f3ticos flotantes que viajan arriba y abajo de la columna de agua, muestra que esta tendencia se ha revertido: la salinidad de la superficie est\u00e1 aumentando, la estratificaci\u00f3n se est\u00e1 debilitando y el hielo marino ha alcanzado m\u00faltiples m\u00ednimos hist\u00f3ricos, con el regreso de grandes aberturas de oc\u00e9ano abierto en el hielo marino (polinias).<\/p>\n<blockquote><p>Es la primera vez que los cient\u00edficos han podido monitorear estos cambios en el oc\u00e9ano Ant\u00e1rtico en tiempo real.<\/p><\/blockquote>\n<p>Las proyecciones anteriores enfatizaban un mayor enfriamiento de la superficie y una estratificaci\u00f3n oce\u00e1nica m\u00e1s fuerte, lo que podr\u00eda haber mantenido una cobertura de hielo marino sostenida. En cambio, se ha producido una r\u00e1pida reducci\u00f3n del hielo marino -un importante reflector de la radiaci\u00f3n solar-, lo que podr\u00eda acelerar el calentamiento global.<\/p>\n<p>(<a href=\"https:\/\/www.servimedia.es\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #ff6600;\"><strong>SERVIMEDIA<\/strong><\/span><\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un equipo de investigadores ha descubierto que el oc\u00e9ano Ant\u00e1rtico se est\u00e1 volviendo m\u00e1s salado en su superficie, lo que incrementa su deshielo. As\u00ed lo explican en un estudio publicado este lunes en la revista \u2018Proceedings of the National Academy of Sciences\u2019 y firmado por autores de Alemania, Espa\u00f1a, Estados Unidos, Italia, Reino Unido y<\/p>\n","protected":false},"author":1,"featured_media":186979,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[316,143],"tags":[453],"class_list":{"0":"post-186978","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-destacadas","8":"category-sociedad","9":"tag-naturaleza"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.6.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Un equipo de investigadores ha descubierto que el oc\u00e9ano Ant\u00e1rtico se est\u00e1 volviendo m\u00e1s salado en su superficie, lo que incrementa su deshielo.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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