PRAHA – Gr\u00f3nsky \u013eadovec je ve\u013emi citliv\u00fd na pomerne mierne a kr\u00e1tke zmeny kl\u00edmy. D\u00f4kazom toho je p\u00f4vod met\u00e1nu unikaj\u00faceho spod \u013eadovca. Poch\u00e1dza z doby po\u013eadovej charakteristickej postupn\u00fdm otep\u013eovan\u00edm, ktor\u00e9 skon\u010dilo pred zhruba 4000 rokmi. \u013dadovec vtedy ust\u00fapil a pevninu pokryla veget\u00e1cia, ktor\u00e1 sa stala po n\u00e1slednom za\u013eadnen\u00ed p\u00f4vodcom s\u00fa\u010dasn\u00e9ho met\u00e1nu. Pri sk\u00faman\u00ed tohto sklen\u00edkov\u00e9ho plynu rozpusten\u00e9ho v \u013eadovcovej vode to zistil medzin\u00e1rodn\u00fd t\u00edm vedcov pod veden\u00edm Marka Stibala z Pr\u00edrodovedeckej fakulty Univerzity Karlovej. Fakulta o tom informovala v tla\u010dovej spr\u00e1ve.<\/p>\n
Vedci sk\u00famali vek met\u00e1nu z vody vytekaj\u00facej zospodu \u013eadovca na jeho z\u00e1padnom okraji. Odobrali desiatky vzoriek na \u00faseku dlhom 2000 kilometrov. Zistili, \u017ee met\u00e1n, ktor\u00fd bol vo vode rozpusten\u00fd, je 1500 a\u017e 4500 rokov star\u00fd. To znamen\u00e1, \u017ee po\u010das holoc\u00e9nu z\u00e1padn\u00fd okraj \u013eadovca v\u00fdrazne odtopil a \u00fazemie pokryla tundrov\u00e1 veget\u00e1cia, ktor\u00fa potom prekryl znova \u013eadovec v n\u00e1slednom chladnej\u0161om obdob\u00ed.<\/p>\n
,,\u0160t\u00fadia prin\u00e1\u0161a \u010fal\u0161\u00ed d\u00f4kaz toho, ak\u00fd citliv\u00fd je Gr\u00f3nsky \u013eadovec k zmen\u00e1m kl\u00edmy. To, \u017ee po\u010das pomerne kr\u00e1tkeho obdobia, ktor\u00e9 bolo klimaticky porovnate\u013en\u00e9 so s\u00fa\u010dasnos\u0165ou, odtopil \u010faleko za hranice dne\u0161n\u00e9ho rozsahu, je znepokojivou pripomienkou toho, \u010do n\u00e1s \u010dak\u00e1 v bl\u00edzkej bud\u00facnosti“, uviedol spoluautor \u0161t\u00fadie.<\/p>\n
\u00a0<\/p>\n
Riziko zr\u00fdchlen\u00e9ho topenia<\/p>\n
Met\u00e1n spod rozt\u00e1paj\u00facich sa okrajov \u013eadovcov unik\u00e1 na mnoh\u00fdch miestach Zeme. Tento len ned\u00e1vno objaven\u00fd fenom\u00e9n preto vyvol\u00e1va obavy z \u010fal\u0161ieho od\u013ead\u0148ovania sp\u00f4soben\u00e9ho s\u00fa\u010dasn\u00fdmi klimatick\u00fdmi zmenami. Celkov\u00e9 mno\u017estvo met\u00e1nu unikaj\u00faceho spod Gr\u00f3nskeho \u013eadovca v s\u00fa\u010dasnej dobe nie je pr\u00edli\u0161 ve\u013ek\u00e9 av glob\u00e1lnom meradle je zatia\u013e zanedbate\u013en\u00e9, pod\u013ea vedcov sa to v\u0161ak m\u00f4\u017ee v bl\u00edzkej bud\u00facnosti zmeni\u0165. Zr\u00fdch\u013euj\u00face topenie \u013eadovcov toti\u017e povedie k zv\u00fd\u0161en\u00fdm emisi\u00e1m met\u00e1nu, a to nielen v Gr\u00f3nsku, ale ve\u013emi pravdepodobne aj v Antarkt\u00edde, kde s\u00fa z\u00e1soby organickej hmoty ove\u013ea v\u00e4\u010d\u0161ie a o\u010dak\u00e1van\u00e9 emisie met\u00e1nu preto potenci\u00e1lne \u010faleko z\u00e1va\u017enej\u0161ie, uviedli v spr\u00e1ve.<\/p>\n
Met\u00e1n zachyt\u00e1va teplo v atmosf\u00e9re pribli\u017ene tridsa\u0165kr\u00e1t intenz\u00edvnej\u0161ie ako oxid uhli\u010dit\u00fd. Met\u00e1n vznik\u00e1 \u010dinnos\u0165ou mikroorganizmov pri rozklade organickej hmoty v prostred\u00ed bez pr\u00edtomnosti kysl\u00edka. Pod\u013ea s\u00fa\u010dasn\u00fdch d\u00e1t tvoria emisie met\u00e1nu z \u013eudskej \u010dinnosti zhruba 60 percent, zatia\u013e \u010do zvy\u0161n\u00fdch 40 percent pripad\u00e1 na tlej\u00face veget\u00e1cie v mokradiach, mo\u010diaroch a \u010fal\u0161\u00edch vodn\u00fdch ploch\u00e1ch.<\/p>\n
Gr\u00f3nsky \u013eadovec pokr\u00fdva zhruba 80 percent Gr\u00f3nska. Po antarktickom \u013eadovci je druh\u00fdm najv\u00e4\u010d\u0161\u00edm na svete. Od severu k juhu je dlh\u00fd 2400 kilometrov, vo svojom naj\u0161ir\u0161om mieste dosahuje \u0161\u00edrku 1100 kilometrov. Jeho hr\u00fabka je preva\u017ene cez dva kilometre.<\/p>\n","protected":false},"excerpt":{"rendered":"PRAHA – Gr\u00f3nsky \u013eadovec je ve\u013emi citliv\u00fd na pomerne mierne a kr\u00e1tke zmeny kl\u00edmy. D\u00f4kazom toho je p\u00f4vod…\n","protected":false},"author":2,"featured_media":62998,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1372,263,24639,24640,33,43,40,42,36,50,49,48],"class_list":{"0":"post-62997","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-svet","8":"tag-gronsko","9":"tag-klima","10":"tag-ladovec","11":"tag-metan","12":"tag-news","13":"tag-sk","14":"tag-slovak","15":"tag-slovencina","16":"tag-spravy","17":"tag-svet","18":"tag-world","19":"tag-world-news"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@sk\/116528570911544707","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/posts\/62997","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/comments?post=62997"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/posts\/62997\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/media\/62998"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/media?parent=62997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/categories?post=62997"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/sk\/wp-json\/wp\/v2\/tags?post=62997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}