{"id":1024,"date":"2006-05-02T08:28:00","date_gmt":"2006-05-02T06:28:00","guid":{"rendered":"https:\/\/kids.esa.int\/space_radar_reveals_antarctic_rivers\/"},"modified":"2026-10-08T00:35:00","modified_gmt":"2026-10-07T22:35:00","slug":"space_radar_reveals_antarctic_rivers","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/cs\/space_radar_reveals_antarctic_rivers\/","title":{"rendered":"Kosmick\u00fd radar odhaluje antarktick\u00e9 \u0159eky"},"content":{"rendered":"
\n

V\u011bdci ji\u017e des\u00edtky let v\u011bd\u00ed o mnoha obrovsk\u00fdch jezerech, kter\u00e1 se skr\u00fdvaj\u00ed pod zamrzlou pustinou Antarktidy. Obvykle se v\u0161ak p\u0159edpokl\u00e1dalo, \u017ee tato jezera jsou od sebe izolovan\u00e1. Nyn\u00ed v\u0161ak evropsk\u00e1 radarov\u00e1 dru\u017eice ERS-2 prok\u00e1zala, \u017ee \u0159eky pod ledem mohou p\u0159en\u00e1\u0161et obrovsk\u00e9 objemy povod\u0148ov\u00e9 vody z jednoho jezera do druh\u00e9ho.<\/p>\n<\/div>\n

Tento objev u\u010dinili brit\u0161t\u00ed v\u011bdci, kte\u0159\u00ed analyzovali zm\u011bny v\u00fd\u0161ky povrchu ledov\u00e9ho \u0161t\u00edtu. Ultrap\u0159esn\u00e1 radarov\u00e1 m\u011b\u0159en\u00ed v\u00fd\u0161ky povrchu odhalila, \u017ee led nad jedn\u00edm jezerem klesl p\u0159ibli\u017en\u011b o t\u0159i metry. Dv\u011b st\u011b devades\u00e1t kilometr\u016f odtud, nad dv\u011bma r\u016fzn\u00fdmi subglaci\u00e1ln\u00edmi jezery, se led naopak vyklenul nahoru.<\/p>\n

Tyto zm\u011bny ve v\u00fd\u0161ce ledu lze vysv\u011btlit t\u00edm, \u017ee pod ledov\u00fdm p\u0159\u00edkrovem o tlou\u0161\u0165ce 4 km tekla \u0159eka tak velk\u00e1 jako lond\u00fdnsk\u00e1 Tem\u017ee. B\u011bhem 16 m\u011bs\u00edc\u016f prot\u00e9klo tunelem vyhlouben\u00fdm v pevn\u00e9m ledu p\u0159ibli\u017en\u011b 1,8 kubick\u00e9ho kilometru vody<\/p>\n

\u201cTyto nov\u00e9 \u00fadaje ukazuj\u00ed, \u017ee jezera pod ledem \u010das od \u010dasu vybuchuj\u00ed jako z\u00e1tky od \u0161ampa\u0148sk\u00e9ho a uvol\u0148uj\u00ed povodn\u011b, kter\u00e9 se \u0161\u00ed\u0159\u00ed na velmi velk\u00e9 vzd\u00e1lenosti,\u201d uvedl prof. Duncan Wingham (University College, Lond\u00fdn).<\/p>\n

\u201cHlavn\u00ed obavou bylo, \u017ee p\u0159i vrt\u00e1n\u00ed a\u017e k jezer\u016fm by se tam mohly dostat nov\u00e9 mikroorganismy,\u201d uvedl prof. Wingham. \u201cNa\u0161e data ukazuj\u00ed, \u017ee p\u0159\u00edpadn\u00e1 kontaminace se neomez\u00ed pouze na jedno jezero, ale v pr\u016fb\u011bhu \u010dasu se roz\u0161\u00ed\u0159\u00ed po cel\u00e9 d\u00e9lce \u0159\u00ed\u010dn\u00ed s\u00edt\u011b.\u201c.<\/p>\n

\u201cDosud jsme o t\u011bchto jezerech uva\u017eovali jako o izolovan\u00fdch biologick\u00fdch laborato\u0159\u00edch. Te\u010f budeme muset sv\u016fj n\u00e1zor p\u0159ehodnotit.\u201d<\/p>","protected":false},"excerpt":{"rendered":"

Scientists have known for decades about many huge lakes that hide beneath the frozen wastes of Antarctica. However, it has usually been assumed that the lakes were isolated. Now a […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2006\/04\/the_dry_valleys_in_coastal_east_antarctica2\/17910935-2-eng-GB\/The_Dry_Valleys_in_coastal_East_Antarctica.jpg","esa_banner_description":"The Dry Valleys in coastal East Antarctica","esa_banner_credit":"David Sugden, Edinburgh University","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2006\/04\/The_Dry_Valleys_in_coastal_East_Antarctica2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[42,10,66],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1024","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-water-world"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/1024","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/comments?post=1024"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/1024\/revisions"}],"predecessor-version":[{"id":2167,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/1024\/revisions\/2167"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/media?parent=1024"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/categories?post=1024"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/tags?post=1024"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/panel?post=1024"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/language?post=1024"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/age?post=1024"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/duration?post=1024"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/resource_type?post=1024"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/audience?post=1024"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/wf_post_folders?post=1024"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}