{"id":130525,"date":"2026-10-25T12:03:38","date_gmt":"2026-10-25T06:33:38","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=130525"},"modified":"2026-10-25T15:22:08","modified_gmt":"2026-10-25T09:52:08","slug":"lake-untersee","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/lake-untersee\/","title":{"rendered":"Lake Untersee"},"content":{"rendered":"<h2><b>Lake Untersee Latest News<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In January 2019, a rare glacial flood caused Lake Untersee to rise by two metres after a neighbouring lake released 17.5 million cubic metres of water.<\/span><\/p>\n<h2><b>About Lake Untersee<\/b><\/h2>\n<ul>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Lake Untersee, meaning &#8220;lower lake&#8221; in German, is a uniquely isolated <\/span><b>freshwater lake<\/b><span style=\"font-weight: 400;\"> in <\/span><b>Antarctica<\/b><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">It is<\/span><b> one of <a href=\"https:\/\/vajiramandravi.com\/current-affairs\/antarctica\/\" target=\"_blank\">Antarctica<\/a>\u2019s largest and deepest <\/b><span style=\"font-weight: 400;\">surface lakes.<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The lake\u2019s maximum depth is thought to reach nearly 170 meters (558 feet).\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Despite being a surface lake, it remains<\/span><b> frozen throughout the year<\/b><span style=\"font-weight: 400;\"> because the region experiences mean annual temperatures of around- 10 degrees Celsius.<\/span><\/li>\n<li style=\"text-align: justify;\"><b>Several meters of thick ice seal the lake <\/b><span style=\"font-weight: 400;\">from the atmosphere.\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><b>Sunlight can still penetrate <\/b><span style=\"font-weight: 400;\">the ice and warm the water beneath it, but <\/span><b>strong winds<\/b><span style=\"font-weight: 400;\"> and <\/span><b>cold surface temperatures cause evaporation and sublimation<\/b><span style=\"font-weight: 400;\"> that <\/span><b>prevent the ice from melting significantly.<\/b><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The <\/span><b>lake\u2019s water mainly comes from<\/b><span style=\"font-weight: 400;\"> seasonal meltwater<\/span> <span style=\"font-weight: 400;\">draining from the edges of the nearby <\/span><b>Anuchin Glacier,<\/b><span style=\"font-weight: 400;\"> which flows south from the <\/span><b>Gruber Mountains<\/b><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">It is known for its <\/span><b>distinctive water chemistry.\u00a0\u00a0\u00a0<\/b><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Its ice-covered waters contain <\/span><b>high levels of dissolved oxygen,<\/b> <b>very low levels of dissolved carbon dioxide<\/b><span style=\"font-weight: 400;\">, and a <strong>s<\/strong><\/span><b>trongly alkaline, or basic, pH.\u00a0<\/b><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">It is <\/span><b>one of the only perennially frozen lakes <\/b><span style=\"font-weight: 400;\">with a <\/span><b>community of large, conical stromatolites.\u00a0<\/b>\n<ul>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Stromatolites are <\/span><b>layered microbial reef structures<\/b> <b>formed by communities<\/b><span style=\"font-weight: 400;\"> of <\/span><b>photosynthetic microbes,<\/b><span style=\"font-weight: 400;\"> mainly <\/span><b>cyanobacteria<\/b><span style=\"font-weight: 400;\">.\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">These microbes <\/span><b>grow slowly upward <\/b><span style=\"font-weight: 400;\">by<\/span><b> trapping sediment<\/b><span style=\"font-weight: 400;\"> on sticky surfaces and <\/span><b>forming calcium carbonate mineral crust<\/b><span style=\"font-weight: 400;\">s.<\/span><b> Over time,<\/b><span style=\"font-weight: 400;\"> this process builds the<strong> l<\/strong><\/span><b>ayered formations.\u00a0<\/b><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Stromatolites are <\/span><b>some of the oldest biological structures on Earth,<\/b><span style=\"font-weight: 400;\"> with fossils dating back more than 3 billion years.\u00a0\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><b>Untersee\u2019s stromatolites<\/b><span style=\"font-weight: 400;\"> grow<\/span><b> unusually tall<\/b><span style=\"font-weight: 400;\"> because they are <\/span><b>sheltered from tides and waves beneath permanent ice,<\/b><span style=\"font-weight: 400;\"> live in exceptionally<\/span><b> clear waters <\/b><span style=\"font-weight: 400;\">with <\/span><b>little sediment,<\/b><span style=\"font-weight: 400;\"> grow toward limited light, and face little grazing.\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><b>These conical stromatolites<\/b><span style=\"font-weight: 400;\">\u2014as well as pinnacle and flat forms of the <\/span><b>microbial communities\u2014release oxygen that becomes trapped<\/b><span style=\"font-weight: 400;\"> under the ice, increasing its concentration in the lake.\u00a0<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The<strong> l<\/strong><\/span><b>ake\u2019s largest creatures <\/b><span style=\"font-weight: 400;\">are <\/span><b>tardigrades<\/b><span style=\"font-weight: 400;\">\u2014<\/span><b>microscopic \u201cwater bear<\/b><span style=\"font-weight: 400;\">\u201d invertebrates known for their ability to s<\/span><b>urvive in extreme environments.\u00a0<\/b><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Its icy environment and unusual chemistry make it a possible analogue for conditions on other worlds.\u00a0<\/span><\/li>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Although Lake Unter-See appears stable, scientists have <\/span><b>observed occasional changes.<\/b>\n<ul>\n<li style=\"text-align: justify;\"><span style=\"font-weight: 400;\">During fieldwork in 2019, researchers noticed that the <\/span><b>lake\u2019s water levels had risen. <\/b><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><b>News: <\/b><a href=\"https:\/\/timesofindia.indiatimes.com\/world\/rest-of-world\/a-2019-flood-raised-an-antarctic-lake-by-2-metres-after-water-escaped-from-a-neighbouring-glacier-fed-lake-scientists-traced-its-effects-on-carbon-cycling-and-microbial-life\/articleshow\/135090635.cms\" target=\"_blank\" rel=\"nofollow noopener\"><b>TOI<\/b><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lake Untersee is a uniquely isolated freshwater lake in Antarctica.  Read more about Lake Untersee, Latest News<\/p>\n","protected":false},"author":23,"featured_media":130563,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[11150,21,22,23],"class_list":["post-130525","post","type-post","status-publish","format-standard","has-post-thumbnail","category-upsc-prelims-current-affairs","tag-lake-untersee","tag-prelims-pointers","tag-upsc-current-affairs","tag-upsc-prelims-current-affairs","no-featured-image-padding"],"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/130525","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/23"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=130525"}],"version-history":[{"count":4,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/130525\/revisions"}],"predecessor-version":[{"id":130562,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/130525\/revisions\/130562"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/130563"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=130525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=130525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=130525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}