{"id":2202,"date":"2023-03-14T06:25:19","date_gmt":"2023-03-14T06:25:19","guid":{"rendered":"https:\/\/www.lifescienceart.com\/?p=2202"},"modified":"2023-03-14T06:25:19","modified_gmt":"2023-03-14T06:25:19","slug":"west-antarctic-ice-sheet-vulnerability-revealed-by-past-global-flood","status":"publish","type":"post","link":"https:\/\/www.lifescienceart.com\/cs\/science\/earth-sciences\/west-antarctic-ice-sheet-vulnerability-revealed-by-past-global-flood\/","title":{"rendered":"Minul\u00e1 glob\u00e1ln\u00ed povode\u0148 odhaluje zranitelnost ledovcov\u00e9ho p\u0159\u00edkrovu Antarktidy"},"content":{"rendered":"

P\u0159edchoz\u00ed glob\u00e1ln\u00ed potopa odhaluje zranitelnost ledov\u00e9ho p\u0159\u00edkrovu Antarktidy<\/h2>\n\n

Eemi\u00e1nsk\u00e1 z\u00e1hada<\/h2>\n\n

P\u0159ed 116 000 a\u017e 129 000 lety byla hladina mo\u0159\u00ed podstatn\u011b vy\u0161\u0161\u00ed ne\u017e dnes, co\u017e zaplavilo pob\u0159e\u017en\u00ed oblasti a cel\u00e9 ostrovy. P\u0159\u00ed\u010dina tohoto vzestupu hladiny v eemi\u00e1nsk\u00e9m obdob\u00ed byla z\u00e1hadou, ale nov\u00fd v\u00fdzkum nazna\u010duje, \u017ee ji spustilo zhroucen\u00ed z\u00e1padoantarktick\u00e9ho ledovcov\u00e9ho p\u0159\u00edkrovu<\/strong>.<\/p>\n\n

Gr\u00f3nsko osvobozeno<\/h2>\n\n

V\u011bdci p\u016fvodn\u011b v\u011b\u0159ili, \u017ee za vzestup hladiny mo\u0159\u00ed v eemi\u00e1nsk\u00e9m obdob\u00ed mohl gr\u00f3nsk\u00fd ledovcov\u00fd p\u0159\u00edkrov. Ned\u00e1vn\u00e9 geologick\u00e9 d\u016fkazy v\u0161ak nazna\u010duj\u00ed, \u017ee gr\u00f3nsk\u00fd led z\u016fstal nedot\u010den, \u010d\u00edm\u017e byl zpro\u0161t\u011bn viny.<\/p>\n\n

Role Z\u00e1padn\u00ed Antarktidy<\/h2>\n\n

Z\u00e1padoantarktick\u00fd ledovcov\u00fd p\u0159\u00edkrov<\/strong> se stal hlavn\u00edm podez\u0159el\u00fdm kv\u016fli sv\u00e9 obrovsk\u00e9 velikosti a nestabilit\u011b. Aby prozkoumali jeho roli, glaciologov\u00e9 analyzovali sediment\u00e1rn\u00ed j\u00e1dra vyvrtan\u00e1 mimo pob\u0159e\u017e\u00ed ledovcov\u00e9ho p\u0159\u00edkrovu. Zjistili, \u017ee v eemi\u00e1nsk\u00e9m obdob\u00ed materi\u00e1l z oblast\u00ed provincie Amundsen<\/strong> a ledovce Pine Island<\/strong> postupn\u011b mizel a zanech\u00e1val pouze bahno z Antarktick\u00e9ho poloostrova<\/strong>.<\/p>\n\n

Zhroucen\u00ed ledovcov\u00e9ho p\u0159\u00edkrovu<\/h2>\n\n

Tento objev nazna\u010duje, \u017ee led v oblastech Amundsen a ledovec Pine Island p\u0159estal t\u00e9ct nebo rozt\u00e1l, zat\u00edmco ledovce na Antarktick\u00e9m poloostrov\u011b p\u0159etrv\u00e1valy. V\u011bdci do\u0161li k z\u00e1v\u011bru, \u017ee z\u00e1padoantarktick\u00fd ledovcov\u00fd p\u0159\u00edkrov<\/strong> zkolaboval, \u010d\u00edm\u017e se zmen\u0161ila jeho schopnost p\u0159isp\u00edvat sedimenty do mo\u0159sk\u00e9ho prost\u0159ed\u00ed.<\/p>\n\n

Citlivost na teplotu<\/h2>\n\n

Zhroucen\u00ed z\u00e1padoantarktick\u00e9ho ledovcov\u00e9ho p\u0159\u00edkrovu<\/strong> zd\u016fraz\u0148uje jeho zranitelnost v\u016f\u010di zm\u011bn\u00e1m teploty. To vyvolalo obavy, proto\u017ee ledovcov\u00fd p\u0159\u00edkrov v sou\u010dasn\u00e9 dob\u011b vykazuje zn\u00e1mky stresu. Je v\u0161ak d\u016fle\u017eit\u00e9 poznamenat, \u017ee eemi\u00e1nsk\u00e9 obdob\u00ed nen\u00ed p\u0159esnou paralelou nyn\u011bj\u0161\u00ed zm\u011bny klimatu, proto\u017ee bylo poh\u00e1n\u011bno p\u0159\u00edrodn\u00edmi faktory, nikoli lidsk\u00fdmi \u010dinnostmi.<\/p>\n\n

Zn\u00e1mky nestability<\/h2>\n\n

P\u0159es rozd\u00edly mezi eemi\u00e1nsk\u00fdm a sou\u010dasn\u00fdm klimatem vykazuje Antarktida zn\u00e1mky nestability. Z\u00e1padoantarktick\u00fd ledovcov\u00fd p\u0159\u00edkrov<\/strong> ztratil od roku 1992 t\u0159i biliony tun ledu a v posledn\u00edch desetilet\u00edch se ztr\u00e1ty ledu zrychluj\u00ed.<\/p>\n\n

Obavy ohledn\u011b V\u00fdchodn\u00ed Antarktidy<\/h2>\n\n

\u4e0d\u4ec5\u662f\u897f\u90e8\uff0c\u4e1c\u90e8\u5357\u6781\u6d32\u51b0\u76d6<\/strong>\u957f\u671f\u4ee5\u6765\u88ab\u8ba4\u4e3a\u662f\u7a33\u5b9a\u7684\uff0c\u4e5f\u8868\u73b0\u51fa\u51b0\u635f\u5931\u7684\u8ff9\u8c61\u3002 Glaciologists\u5df2\u7ecf\u89c2\u5bdf\u5230Vincennes Bay\u548c\u5de8\u5927\u7684Totten Glacier\u4e2d\u51b0\u5ddd\u7684\u53d8\u8584\u548c\u52a0\u901f\u6d41\u52a8\u901f\u7387\u3002\u8fd9\u4e9b\u7cfb\u7edf\u542b\u6709\u8db3\u591f\u7684\u51b0\uff0c\u53ef\u4ee5\u4f7f\u6d77\u5e73\u9762\u5347\u9ad830\u82f1\u5c3a\u3002<\/p>\n\n

Dopad na hladinu mo\u0159e<\/h2>\n\n

Podle NASA t\u00e1n\u00ed antarktick\u00e9ho ledu ji\u017e od roku 1992 p\u0159isp\u011blo ke zv\u00fd\u0161en\u00ed hladiny sv\u011btov\u00e9ho oce\u00e1nu o 0,3 palce. Pokud by rozt\u00e1l v\u0161echen led v Antarktid\u011b, hladina mo\u0159e by stoupla o obrovsk\u00fdch 190 stop. I kdy\u017e se to m\u016f\u017ee zd\u00e1t extr\u00e9mn\u00ed, studie nazna\u010duj\u00ed, \u017ee sp\u00e1len\u00ed v\u0161ech dostupn\u00fdch fosiln\u00edch paliv by mohlo potenci\u00e1ln\u011b roztavit celou ledovou \u010depici.<\/p>\n\n

Dal\u0161\u00ed v\u00fdzkum<\/h2>\n\n

V\u011bdci pl\u00e1nuj\u00ed vyvrtat dal\u0161\u00ed sediment\u00e1rn\u00ed j\u00e1dra u pob\u0159e\u017e\u00ed Antarktidy, aby z\u00edskali v\u00edce informac\u00ed o eemi\u00e1nsk\u00e9m obdob\u00ed. Jejich zji\u0161t\u011bn\u00ed pomohou zp\u0159esnit na\u0161e ch\u00e1p\u00e1n\u00ed zranitelnosti antarktick\u00fdch ledovcov\u00fdch p\u0159\u00edkrov\u016f v\u016f\u010di zm\u011bn\u011b klimatu a jej\u00edm potenci\u00e1ln\u00edm d\u016fsledk\u016fm pro vzestup hladiny mo\u0159\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"

P\u0159edchoz\u00ed glob\u00e1ln\u00ed potopa odhaluje zranitelnost ledov\u00e9ho p\u0159\u00edkrovu Antarktidy Eemi\u00e1nsk\u00e1 z\u00e1hada P\u0159ed 116 000 a\u017e 129 000 lety byla hladina mo\u0159\u00ed podstatn\u011b vy\u0161\u0161\u00ed ne\u017e dnes, co\u017e zaplavilo pob\u0159e\u017en\u00ed oblasti a cel\u00e9…<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[728],"tags":[721,4596,4594,4592,4597,473,4593,4598,4599,4595,34,749],"class_list":["post-2202","post","type-post","status-publish","format-standard","hentry","category-earth-sciences","tag-antarctica","tag-east-antarctic-ice-sheet","tag-eemian-period","tag-ice-sheets","tag-pine-island-glacier","tag-nasa","tag-global-flood","tag-totten-glacier","tag-vincennes-bay","tag-west-antarctic-ice-sheet","tag-climate-change","tag-sea-level-rise"],"_links":{"self":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2202","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/comments?post=2202"}],"version-history":[{"count":1,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2202\/revisions"}],"predecessor-version":[{"id":2203,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/posts\/2202\/revisions\/2203"}],"wp:attachment":[{"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/media?parent=2202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/categories?post=2202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifescienceart.com\/cs\/wp-json\/wp\/v2\/tags?post=2202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}