{"id":50538,"date":"2024-03-29T00:42:58","date_gmt":"2024-03-28T23:42:58","guid":{"rendered":"https:\/\/www.infokuryr.cz\/n\/?p=50538"},"modified":"2024-03-28T18:45:12","modified_gmt":"2024-03-28T17:45:12","slug":"tajici-polarni-led-zpusobujici-zkresleni-v-case","status":"publish","type":"post","link":"https:\/\/www.infokuryr.cz\/n\/2024\/03\/29\/tajici-polarni-led-zpusobujici-zkresleni-v-case\/","title":{"rendered":"Taj\u00edc\u00ed pol\u00e1rn\u00ed led zp\u016fsobuj\u00edc\u00ed zkreslen\u00ed v \u010dase"},"content":{"rendered":"<div id=\"fb-root\"><\/div>\n<p><span style=\"font-size: 18pt;\"><strong>Glob\u00e1ln\u00ed oteplov\u00e1n\u00ed vyvrac\u00ed Zemi z rovnov\u00e1hy a prodlu\u017euje dny, varoval kalifornsk\u00fd fyzik<\/strong><\/span><\/p>\n<p><span>T\u00e1n\u00ed pol\u00e1rn\u00edch ledovc\u016f p\u0159esouv\u00e1 v\u00e1hu Zem\u011b sm\u011brem k rovn\u00edku a zpomaluje rotaci na\u0161\u00ed planety, uv\u00e1d\u00ed zpr\u00e1va ve v\u011bdeck\u00e9m \u010dasopise Nature. Zpr\u00e1va varovala, \u017ee toto zpomalen\u00ed by mohlo zp\u016fsobit zmatek v glob\u00e1ln\u00edm m\u011b\u0159en\u00ed \u010dasu.<\/span><\/p>\n<p><span>Lidstvo z\u00e1vis\u00ed na s\u00edti 450 atomov\u00fdch hodin, aby udr\u017eelo koordinovan\u00fd sv\u011btov\u00fd \u010das (UTC). S\u00ed\u0165ov\u00e9 v\u00fdpo\u010dty, glob\u00e1ln\u00ed um\u00edst\u011bn\u00ed a finan\u010dn\u00ed trhy vy\u017eaduj\u00ed toto p\u0159esn\u00e9 m\u011b\u0159en\u00ed \u010dasu, aby fungovaly. Rotace Zem\u011b v\u0161ak nen\u00ed v\u017edy v souladu s t\u00edmto ofici\u00e1ln\u00edm standardem: gravita\u010dn\u00ed odpor Slunce a M\u011bs\u00edce, zm\u011bny rychlosti rotace j\u00e1dra planety a zem\u011bt\u0159esen\u00ed mohou urychlit nebo zpomalit b\u011bh \u010dasu.<\/span><\/p>\n<p><span>Nejnov\u011bj\u0161\u00ed hrozba pro UTC poch\u00e1z\u00ed z t\u00e1n\u00ed ledovc\u016f v Gr\u00f3nsku a Antarktid\u011b, vysv\u011btlil\u00a0ve st\u0159edu v\u00a0<\/span><a href=\"https:\/\/www.nature.com\/articles\/s41586-024-07170-0.epdf?sharing_token=ge_YZOs9V7n4lGAOlxiHa9RgN0jAjWel9jnR3ZoTv0M8eI6W1yLpWHEpE-RIkTCyYE2WIbRIkp2z3i1LfYhEU9EWU1gdRL5O7s1BqW5HWVJSq3pB3eLXyhGjDlJnzhojhoHnlcXg8AfgqT02E_Fv_95ko4XCgn_qYDTsjFi3_YOa8GBAoXDgyyNKX-e9AUYAcAlfZsvwL1NA4zHrxQ9xuDSG7v7h-InAakMIG_2bIs5i2sZfTqIbKzPIAo2EsF_ANA3-Lt_oG6U-kTb1rL6lOzBoQv9F5EkMgCSO98NRWH8%3D&amp;tracking_referrer=www.sciencenews.org\" target=\"_blank\" rel=\"noopener noreferrer\"><span>Nature<\/span><\/a><span>\u00a0geofyzik Duncan Agnew. Pomoc\u00ed satelitn\u00edho gravita\u010dn\u00edho m\u011b\u0159en\u00ed Agnew a jeho t\u00fdm z Kalifornsk\u00e9 univerzity objevili, \u017ee taj\u00edc\u00ed led se usazuje jako voda kolem st\u0159edu Zem\u011b, p\u0159i\u010dem\u017e tato zm\u011bna hmoty zpomaluje rychlost rotace planety.<\/span><\/p>\n<p><span>Od p\u0159ijet\u00ed UTC v roce 1963 glob\u00e1ln\u00ed konsorcium v\u011bdc\u016f p\u0159idalo 27 \u201ep\u0159estupn\u00fdch sekund\u201c, aby vysv\u011btlilo zpomaluj\u00edc\u00ed se rotaci Zem\u011b. Zem\u011b se v\u0161ak v posledn\u00edch letech to\u010dila rychleji a v\u011bdci uva\u017eovali o ode\u010dten\u00ed vte\u0159iny do roku 2026. Podle Agnewova v\u00fdzkumu zpomalen\u00ed planety znamen\u00e1, \u017ee toto rozhodnut\u00ed bude nyn\u00ed a\u017e do roku 2029 zbyte\u010dn\u00e9.<\/span><\/p>\n<p><em><span>\u201ePokud by se t\u00e1n\u00ed pol\u00e1rn\u00edho ledu ned\u00e1vno nezrychlilo, tento probl\u00e9m by nastal o t\u0159i roky d\u0159\u00edve,\u201c<\/span><\/em><span>\u00a0napsal Agnew.\u00a0<\/span><em><span>&#8222;Glob\u00e1ln\u00ed oteplov\u00e1n\u00ed ji\u017e ovliv\u0148uje glob\u00e1ln\u00ed m\u011b\u0159en\u00ed \u010dasu.&#8220;<\/span><\/em><\/p>\n<p><span>Bez ohledu na to, kdy se tato sekunda ode\u010dte, v\u011bdci si nejsou jisti, jak tento krok ovlivn\u00ed po\u010d\u00edta\u010dov\u00e9 a s\u00ed\u0165ov\u00e9 syst\u00e9my.\u00a0<\/span><\/p>\n<p><em><span>\u201eR\u016fzn\u00e9 webov\u00e9 slu\u017eby v sou\u010dasnosti zvl\u00e1daj\u00ed p\u0159estupn\u00e9 sekundy odli\u0161n\u011b,\u201c<\/span><\/em><span>\u00a0napsal Agnew.\u00a0<\/span><em><span>\u201eMnoho syst\u00e9m\u016f m\u00e1 nyn\u00ed software, kter\u00fd dok\u00e1\u017ee p\u0159ijmout dal\u0161\u00ed sekundu, ale jen m\u00e1lo z nich, pokud v\u016fbec n\u011bjak\u00e9, umo\u017e\u0148uje sekundu odstranit, tak\u017ee se o\u010dek\u00e1v\u00e1, \u017ee z\u00e1porn\u00e1 p\u0159estupn\u00e1 sekunda zp\u016fsob\u00ed mnoho pot\u00ed\u017e\u00ed.\u201c<\/span><\/em><\/p>\n<p><span>Krom\u011b dopadu na m\u011b\u0159en\u00ed \u010dasu se o\u010dek\u00e1v\u00e1, \u017ee t\u00e1n\u00ed ledov\u00fdch \u010depic zp\u016fsob\u00ed po cel\u00e9m sv\u011bt\u011b \u0159adu probl\u00e9m\u016f a p\u0159\u00edle\u017eitost\u00ed. Podle nejhor\u0161\u00edch odhad\u016f Sv\u011btov\u00e9 banky by vzestup hladiny mo\u0159\u00ed o 10-100 centimetr\u016f do roku 2100 mohl potopit cel\u00e9 souostrov\u00ed Maledivy. Na druhou stranu, t\u00e1n\u00ed arktick\u00e9ho ledu pod\u00e9l severn\u00edho pob\u0159e\u017e\u00ed Ruska by mohlo otev\u0159\u00edt\u00a0<\/span><a href=\"https:\/\/swentr.site\/news\/567660-russia-is-breaking-ice\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span>Severn\u00ed n\u00e1mo\u0159n\u00ed cestu<\/span><\/a><span>\u00a0celoro\u010dn\u00ed n\u00e1mo\u0159n\u00ed doprav\u011b, zkr\u00e1tit dobu cesty z \u010c\u00edny do Evropy t\u00e9m\u011b\u0159 na polovinu a z\u00edskat Moskvu pod kontrolu lukrativn\u00ed lodn\u00ed trasy.<\/span><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1185\" src=\"http:\/\/www.infokuryr.cz\/n\/wp-content\/uploads\/2021\/04\/kuryr-podpis.png\" alt=\"\" width=\"84\" height=\"24\" \/><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Glob\u00e1ln\u00ed oteplov\u00e1n\u00ed vyvrac\u00ed Zemi z rovnov\u00e1hy a prodlu\u017euje dny, varoval kalifornsk\u00fd fyzik T\u00e1n\u00ed pol\u00e1rn\u00edch ledovc\u016f&#8230;<\/p>\n","protected":false},"author":2,"featured_media":50539,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[1194,873,1102,1100,839],"_links":{"self":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts\/50538"}],"collection":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/comments?post=50538"}],"version-history":[{"count":0,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts\/50538\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/media\/50539"}],"wp:attachment":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/media?parent=50538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/categories?post=50538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/tags?post=50538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}