{"id":371930,"date":"2018-06-14T08:12:18","date_gmt":"2018-06-14T06:12:18","guid":{"rendered":"https:\/\/hudo.com\/si\/2018\/06\/14\/alarm-antarktika-izgubila-2700-milijard-ton-ledu\/"},"modified":"2018-06-14T08:12:18","modified_gmt":"2018-06-14T06:12:18","slug":"alarm-antarktika-izgubila-2700-milijard-ton-ledu","status":"publish","type":"post","link":"https:\/\/hudo.com\/si\/lifestyle\/alarm-antarktika-izgubila-2700-milijard-ton-ledu\/","title":{"rendered":"Alarm: Antarktika izgubila 2700 milijard ton ledu"},"content":{"rendered":"
\n

Dve petini te izgube ledu se je zgodilo v zadnjih petih letih, kar pomeni, da se je tempo izgubljanja ledenega oklepa Antarktike potrojil.<\/p>\n

Ugotovitve naj bi dokon\u010dno razblinile \u0161e zadnje dvome glede tega, da ledeni kontinent izgublja svojo maso. Znanstveniki poleg tega opozarjajo, da bi ta led lahko pomembno vplival na vi\u0161anje gladine oceanov, s tem pa ogrozil \u0161tevilna priobalna mesta z na stotinami milijonov prebivalcev.<\/p>\n

“Ti rezultati so nov alarm, da moramo storiti ve\u010d za zaustavitev segrevanja na\u0161ega planeta,” je rezultate \u0161tudije za francosko tiskovno agencijo AFP komentiral eden od njenih avtorjev Eric Rignot, ki v okviru Nasinega laboratorija JPL \u017ee dve desetletji spremlja debelino ledenih ploskev na Zemlji.<\/p>\n

Vse doslej so znanstveniki ugibali, koliko ledu Antarktika pridobiva s sne\u017enimi padavinami, koliko pa ga izgublja s taljenjem. Rezultati iz skupno 24 lo\u010denih satelitskih opazovanj, ki so potekala dvajset let, pa so zdaj kon\u010dno pokazali kon\u010dno sliko, da se je masa ju\u017ene celine od leta 1992 zmanj\u0161ala za 2700 milijard ton ledu, kar je gladino oceanov \u017ee dvignilo za osem milimetrov.<\/p>\n

V dveh desetletjih pred letom 2012 je Antarktika izgubljala okoli 76 milijard ton letno, po tem letu pa se je proces taljenja ledu pospe\u0161il in zdaj ga povpre\u010dno izgublja \u017ee 219 milijard ton letno.<\/p>\n

Povr\u0161ina ledu na Antarktiki je sicer za dvakrat ve\u010dja od povr\u0161ine celinskih ZDA, \u010de bi se ves stalil, pa znanstveniki ocenjujejo, da bi se gladina oceanov dvignila za skoraj 60 metrov.<\/p>\n

Ve\u010d kot 90 odstotkov ledu je na vzhodnem delu Antarktike in njegova koli\u010dina ostaja bolj ali manj stabilna, \u010deprav znanstveniki ne vedo, kako dolgo \u0161e, glede na to, da so se povpre\u010dne temperature na Zemlji \u017ee dvignile za skoraj celo stopinjo Celzija.<\/p>\n

Zelo ranljiva za podnebne spremembe pa je Zahodna Antarktika, kjer se izgubljanje ledu pospe\u0161uje. Od leta 1995 se je na tem obmo\u010dju v morje odlomilo \u017ee za ve\u010d kot 6500 kvadratnih kilometrov ledenih plo\u0161\u010d.<\/p>\n

Ker te sicer \u017ee plavajo na morju, ne povzro\u010dajo dodatnega dviga gladine morij, vendar pa zadr\u017eujejo ogromne ledenike, ki po\u010dasi drsijo proti oceanu in vsebujejo toliko ledu, da bi se gladina morij lahko dvignila za 3 metre in pol, opozarjajo znanstveniki.<\/p>\n

Dva od teh ledenikov – Pine Island in Thwaites – sta \u0161e posebej nestabilna in njuno gibanje proti morju se je pospe\u0161ilo. Oba pa skupaj zadr\u017eujeta \u0161e dodaten led iz celine, da ne zdrsi v ocean.<\/p>\n

Glede na sedanje trende bi Antarktika ob Grenlandiji tako lahko postala nov najve\u010dji vir vode, ki bi dvigoval gladino oceanov, \u0161e opozarjajo znanstveniki v \u0161tudiji.<\/p>\n

Gladina oceanov se zaradi podnebnih sprememb in taljenja ledenikov trenutno zvi\u0161uje za 3,4 milimetra letno. Od leta 1993 pa se je gladina skupno povi\u0161ala \u017ee za 84,8 milimetra.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Antarktika je od leta 1992 izgubila 2700 milijard ton ledu, s \u010dimer se nevarnost zvi\u0161evanja oceanov \u0161e dodatno pove\u010duje, ugotavlja \u0161tudija konzorcija 84 znanstvenikov, objavljena v novi \u0161tevilki znanstvene revije Nature.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1091],"tags":[4260,1940,4724],"source":[1522,1518,1552],"supertag":[],"acf":[],"yoast_head":"\nAlarm: Antarktika izgubila 2700 milijard ton ledu - Hudo Slovenija<\/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:\/\/hudo.com\/si\/lifestyle\/alarm-antarktika-izgubila-2700-milijard-ton-ledu\/\" \/>\n<meta property=\"og:locale\" content=\"sl_SI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Alarm: Antarktika izgubila 2700 milijard ton ledu - 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