{"id":55438,"date":"2022-11-01T23:01:48","date_gmt":"2022-11-01T23:01:48","guid":{"rendered":"https:\/\/www.aprh.pt\/?p=55438"},"modified":"2022-11-01T23:03:58","modified_gmt":"2022-11-01T23:03:58","slug":"agua-salobra","status":"publish","type":"post","link":"https:\/\/aprh.pt\/pt\/publicacoes\/glossario\/a\/agua-salobra\/","title":{"rendered":"\u00c1gua salobra"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"55438\" class=\"elementor elementor-55438\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6177c6a9 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6177c6a9\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6a5c9fa9\" data-id=\"6a5c9fa9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-1e0cae59 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1e0cae59\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-33a3d905\" data-id=\"33a3d905\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9cbcf12 elementor-widget elementor-widget-heading\" data-id=\"9cbcf12\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Gloss\u00e1rio<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f297090 elementor-nav-menu__align-center elementor-nav-menu--dropdown-none elementor-widget elementor-widget-nav-menu\" data-id=\"f297090\" data-element_type=\"widget\" data-settings=\"{&quot;layout&quot;:&quot;horizontal&quot;,&quot;submenu_icon&quot;:{&quot;value&quot;:&quot;&lt;i class=\\&quot;fas fa-caret-down\\&quot;&gt;&lt;\\\/i&gt;&quot;,&quot;library&quot;:&quot;fa-solid&quot;}}\" data-widget_type=\"nav-menu.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t<nav aria-label=\"Menu\" class=\"elementor-nav-menu--main elementor-nav-menu__container elementor-nav-menu--layout-horizontal e--pointer-underline e--animation-fade\">\n\t\t\t\t<ul id=\"menu-1-f297090\" class=\"elementor-nav-menu\"><li class=\"menu-item menu-item-type-taxonomy 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href=\"https:\/\/aprh.pt\/pt\/category\/publicacoes\/glossario\/y\/\" class=\"elementor-item\" tabindex=\"-1\">Y<\/a><\/li>\n<li class=\"menu-item menu-item-type-taxonomy menu-item-object-category menu-item-54675\"><a href=\"https:\/\/aprh.pt\/pt\/category\/publicacoes\/glossario\/z\/\" class=\"elementor-item\" tabindex=\"-1\">Z<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1cb5d914 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1cb5d914\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-35a01897\" data-id=\"35a01897\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-413c23ab elementor-widget elementor-widget-heading\" data-id=\"413c23ab\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\u00c1gua salobra<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-6248efb\" data-id=\"6248efb\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3f1b7819 elementor-widget elementor-widget-text-editor\" data-id=\"3f1b7819\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">(I. brackish water)<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1ffd09d2 elementor-widget elementor-widget-text-editor\" data-id=\"1ffd09d2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">\u00c1gua com salinidade interm\u00e9dia entre a \u00e1gua salgada (marinha) e a \u00e1gua doce, isto \u00e9, com salinidade entre 5\u2030 e 30\u2030. \u00c9, portanto, uma mistura de \u00e1gua doce com \u00e1gua salgada.\u00a0 Ocorre em ambientes diversificados, mas principalmente em estu\u00e1rios e lagunas, embora alguns mares sejam, tamb\u00e9m, constitu\u00eddos por \u00e1gua salobra. As caracter\u00edstica salinas nos corpos lagunares dependem essencialmente do afluxo fluvial de \u00e1gua e das trocas h\u00eddricas com o oceano, bem como das caracter\u00edsticas clim\u00e1ticas, visto que a precipita\u00e7\u00e3o intensa ou a aridez clim\u00e1tica podem modificar substancialmente a salinidade \u00e0 superf\u00edcie. S\u00e3o estes mesmos factores que influenciam a salinidade nos estu\u00e1rios, embora nestes os aspectos relacionados com a circula\u00e7\u00e3o sejam, em geral, bastante mais importantes. Perante caudais fluviais muito importantes (cheias) os estu\u00e1rios podem ficar totalmente preenchidos com \u00e1gua doce, sendo a \u00e1gua salobra empurrada para a plataforma continental. Se os caudais fluviais s\u00e3o muito grandes, a pluma de \u00e1gua salobra pode penetrar bastante na \u00e1gua marinha. Um caso extremo \u00e9 do rio Amazonas, cujas \u00e1guas diluem a salinidade \u00e0 superf\u00edcie do Atl\u00e2ntico, tornando-a salobra, at\u00e9 dist\u00e2ncias que, por vezes, ultrapassam os 300 quil\u00f3metros.<\/span><\/p><p><span style=\"font-weight: 400;\">No que se refere a mares, o que apresenta maior salobridade \u00e9 o Mar B\u00e1ltico que, \u00e0 superf\u00edcie, na parte central, apresenta salinidades entre 6 e 8 \u2030, sendo ainda menor nos golfos em que desaguam os rios com maior escoamento. Na parte central da bacia, abaixo dos 50 metros de profundidade, devido \u00e0 estratifica\u00e7\u00e3o das massas de \u00e1gua, a salinidade atinge valores entre 10 e 15\u2030. A \u00e1gua salobra do mar B\u00e1ltico resulta do facto de ser um mar confinado (que contacta com o mar do Norte atrav\u00e9s dos estreitos da Dinamarca), para onde escoam cerca de duas centenas de rios.<\/span><\/p><p><span style=\"font-weight: 400;\">O Mar Negro tem algumas semelhan\u00e7as com o B\u00e1ltico porquanto \u00e9, tamb\u00e9m, bastante confinado (efectuando trocas hidrol\u00f3gicas com o Mediterr\u00e2neo apenas atrav\u00e9s do Estreito do B\u00f3sforo \u2013 Mar de M\u00e1rmara \u2013 Estreito de Dardanelos), e nele desaguam v\u00e1rios rios, dos quais os mais importantes s\u00e3o o Don, o Dnieper e o Dan\u00fabio. A salinidade \u00e0 superf\u00edcie e da ordem de 18\u2030. Por\u00e9m, abaixo da superf\u00edcie localiza-se a \u00c1gua Fria Interm\u00e9dia, com \u00e1gua mais fria e salgada resultante do arrefecimento e decr\u00e9scimo dos escoamentos fluviais durante o Inverno. Na base desta massa de \u00e1gua, entre os 100 e os 200 metros de profundidade, define-se a principal picnoclina (simultaneamente termoclina e haloclina), abaixo da qual a salinidade aumenta para valores da ordem de 22\u2030 ou um pouco maiores. Por via de regra n\u00e3o \u00e9 detectada a exist\u00eancia de \u00e1gua salgada: apenas existe \u00e1gua salobra.<\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1c7ff29 elementor-widget elementor-widget-text-editor\" data-id=\"1c7ff29\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.aprh.pt\/pt\/publicacoes\/glossario\/autores\/\">Autor<\/a>: JAD<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-25 elementor-top-column elementor-element elementor-element-30f6d91b elementor-hidden-tablet elementor-hidden-mobile\" data-id=\"30f6d91b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-325e0cbb elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"325e0cbb\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-27b43ff5\" data-id=\"27b43ff5\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1633dd02 elementor-widget elementor-widget-global elementor-global-500 elementor-widget-spacer\" data-id=\"1633dd02\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>\u00c1gua com salinidade interm\u00e9dia entre a \u00e1gua salgada (marinha) e a \u00e1gua doce, isto \u00e9, com salinidade entre 5\u2030 e 30\u2030. \u00c9, portanto, uma mistura de \u00e1gua doce com \u00e1gua salgada. (&#8230;)<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[286],"tags":[],"class_list":["post-55438","post","type-post","status-publish","format-standard","hentry","category-a"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u00c1gua salobra - APRH<\/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:\/\/aprh.pt\/publicacoes\/glossario\/a\/agua-salobra\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c1gua salobra - APRH\" \/>\n<meta property=\"og:description\" content=\"\u00c1gua com salinidade interm\u00e9dia entre a \u00e1gua salgada (marinha) e a \u00e1gua doce, isto \u00e9, com salinidade entre 5\u2030 e 30\u2030. \u00c9, portanto, uma mistura de \u00e1gua doce com \u00e1gua salgada. 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