{"id":99527,"date":"2026-02-15T00:24:52","date_gmt":"2026-02-14T23:24:52","guid":{"rendered":"https:\/\/www.infokuryr.cz\/n\/?p=99527"},"modified":"2026-02-14T14:50:01","modified_gmt":"2026-02-14T13:50:01","slug":"klimaticky-sok-doby-ledove-o-16-stupnu-za-pouhych-nekolik-desetileti-zcela-bez-narustu-co2","status":"publish","type":"post","link":"https:\/\/www.infokuryr.cz\/n\/2026\/02\/15\/klimaticky-sok-doby-ledove-o-16-stupnu-za-pouhych-nekolik-desetileti-zcela-bez-narustu-co2\/","title":{"rendered":"Klimatick\u00fd \u0161ok doby ledov\u00e9: O +16 stup\u0148\u016f za pouh\u00fdch n\u011bkolik desetilet\u00ed \u2013 zcela bez n\u00e1r\u016fstu CO2"},"content":{"rendered":"<div id=\"fb-root\"><\/div>\n<p><strong><span dir=\"auto\">Nov\u00e9 rekonstrukce pylu ukazuj\u00ed, \u017ee b\u011bhem posledn\u00ed doby ledov\u00e9 do\u0161lo k glob\u00e1ln\u00edm teplotn\u00edm v\u00fdkyv\u016fm, kter\u00e9 zast\u00ednily v\u0161e, co v sou\u010dasnosti pozorujeme. A to se stalo p\u0159i atmosf\u00e9rick\u00fdch koncentrac\u00edch CO2 pouh\u00fdch 200 ppm \u2013 co\u017e je zhruba polovina dne\u0161n\u00ed \u00farovn\u011b.<\/span><\/strong><\/p>\n<p><span dir=\"auto\">Ned\u00e1vn\u00e1 studie publikovan\u00e1 v \u010dasopise Climate of the Past s n\u00e1zvem \u201e\u00a0<\/span><a href=\"https:\/\/cp.copernicus.org\/articles\/22\/205\/2026\/cp-22-205-2026.pdf\"><span dir=\"auto\">Glob\u00e1ln\u00ed anal\u00fdza rekonstrukc\u00ed zm\u011bn klimatu na pevnin\u011b zalo\u017een\u00fdch na pylu b\u011bhem Dansgaard-Oeschgerov\u00fdch ud\u00e1lost\u00ed<\/span><\/a><span dir=\"auto\"> \u201c analyzuje pylov\u00e9 archivy po cel\u00e9m sv\u011bt\u011b a rekonstruuje zm\u011bny teploty a vlhkosti b\u011bhem tzv. Dansgaard-Oeschgerov\u00fdch ud\u00e1lost\u00ed. Tato n\u00e1hl\u00e1 tepl\u00e1 obdob\u00ed se \u010dasto vyskytovala mezi 57 000 a 29 000 lety \u2013 celkem jeden\u00e1ctkr\u00e1t jen b\u011bhem 3. izotopov\u00e9 f\u00e1ze mo\u0159\u00ed. V Gr\u00f3nsku se teploty dramaticky zv\u00fd\u0161ily o 10 a\u017e 16 stup\u0148\u016f Celsia b\u011bhem 50 a\u017e 200 let.<\/span><\/p>\n<p><span dir=\"auto\">Tato tepl\u00e1 obdob\u00ed nebyla ojedin\u011bl\u00fdm jevem Arktidy. Podle glob\u00e1ln\u00ed pylov\u00e9 anal\u00fdzy byly odpov\u00eddaj\u00edc\u00ed sign\u00e1ly detekov\u00e1ny v Asii, Evrop\u011b, Africe, Severn\u00ed a Ji\u017en\u00ed Americe, na St\u0159edn\u00edm v\u00fdchod\u011b a v Austr\u00e1lii. Zimn\u00ed teploty se region\u00e1ln\u011b zv\u00fd\u0161ily o 2 a\u017e 5 stup\u0148\u016f a v n\u011bkter\u00fdch p\u0159\u00edpadech dokonce o 5 a\u017e 20 stup\u0148\u016f b\u011bhem n\u011bkolika desetilet\u00ed nebo stolet\u00ed. Jak se o\u010dek\u00e1valo, k v\u011bt\u0161\u00edm teplotn\u00edm v\u00fdkyv\u016fm do\u0161lo ve st\u0159edn\u00edch a vy\u0161\u0161\u00edch severn\u00edch zem\u011bpisn\u00fdch \u0161\u00ed\u0159k\u00e1ch, men\u0161\u00edm v tropech.<\/span><\/p>\n<p><span dir=\"auto\">Studie pou\u017eila standardizovanou regresn\u00ed metodu (fxTWA-PLS) k rekonstrukci sez\u00f3nn\u00edch teplot a vlhkosti dostupn\u00e9 pro rostliny. Dokonce zohlednila, \u017ee ni\u017e\u0161\u00ed hladiny CO\u2082 ovliv\u0148uj\u00ed efektivitu vyu\u017e\u00edv\u00e1n\u00ed vody rostlinami. Jin\u00fdmi slovy, metodologick\u00e9 \u00fasil\u00ed bylo vynalo\u017eeno nejen na interpretaci korelac\u00ed, ale i na prezentaci robustn\u00edch, kvantitativn\u00edch odhad\u016f. A v\u00fdsledek neodpov\u00edd\u00e1 konven\u010dn\u00edmu narativu katastrofy zp\u016fsoben\u00e9 CO\u2082.<\/span><\/p>\n<p><span dir=\"auto\">Nejv\u00fdrazn\u011bj\u0161\u00ed oteplov\u00e1n\u00ed nastalo v severn\u00edch st\u0159edn\u00edch zem\u011bpisn\u00fdch \u0161\u00ed\u0159k\u00e1ch, zejm\u00e9na v Eurasii. Je pozoruhodn\u00e9, \u017ee zimn\u00ed teploty vzrostly prud\u010deji ne\u017e letn\u00ed. To vedlo ke sn\u00ed\u017een\u00ed sez\u00f3nnosti \u2013 m\u00edrn\u011bj\u0161\u00edm zim\u00e1m bez odpov\u00eddaj\u00edc\u00edho n\u00e1r\u016fstu letn\u00edch teplot. Na ji\u017en\u00ed polokouli byly zm\u011bny \u010d\u00e1ste\u010dn\u011b opa\u010dn\u00e9 nebo v\u00fdrazn\u011b m\u00e9n\u011b v\u00fdrazn\u00e9, co\u017e nazna\u010duje slo\u017eit\u00e9 interakce mezi oce\u00e1nem a atmosf\u00e9rou.<\/span><\/p>\n<p><span dir=\"auto\">Tyto severoji\u017en\u00ed antif\u00e1ze jsou ji\u017e dlouho zn\u00e1my z ledov\u00fdch jader. Nov\u00e9 je v\u0161ak systematick\u00e1, glob\u00e1ln\u00ed kvantifikace s vyu\u017eit\u00edm pozemn\u00edch pylov\u00fdch archiv\u016f. To jasn\u011b ukazuje: Dynamika klimatu v minulosti byla v\u0161\u00edm, jen ne pomal\u00e1. Byla n\u00e1hl\u00e1, region\u00e1ln\u011b diferencovan\u00e1 a zna\u010dn\u00e9ho rozsahu. Obzvl\u00e1\u0161t\u011b nev\u00edtan\u00e9 pro dominantn\u00ed narativ: B\u011bhem t\u011bchto masivn\u00edch oteplovac\u00edch vln z\u016fstala hladina atmosf\u00e9rick\u00e9ho CO2 do zna\u010dn\u00e9 m\u00edry konstantn\u00ed na \u00farovni kolem 200 ppm. Nedo\u0161lo k \u017e\u00e1dn\u00e9mu paraleln\u00edmu n\u00e1r\u016fstu, kter\u00fd by mohl slou\u017eit jako zjevn\u00fd \u201ehnac\u00ed s\u00edla\u201c.<\/span><\/p>\n<p><span dir=\"auto\">Pokud by dvoucifern\u00fd n\u00e1r\u016fst teploty byl mo\u017en\u00fd b\u011bhem pouh\u00fdch n\u011bkolika desetilet\u00ed i za stabiln\u00edch, n\u00edzk\u00fdch koncentrac\u00ed CO2, pak mus\u00edme nevyhnuteln\u011b zv\u00e1\u017eit vnit\u0159n\u00ed klimatick\u00e9 mechanismy. Zm\u011bny v oce\u00e1nsk\u00e9 cirkulaci, zejm\u00e9na v severn\u00edm Atlantiku, jsou ji\u017e dlouho diskutov\u00e1ny jako spou\u0161t\u011b\u010de ud\u00e1lost\u00ed rozpu\u0161t\u011bn\u00e9ho kysl\u00edku. Klimatick\u00fd syst\u00e9m se zd\u00e1 b\u00fdt vysoce citliv\u00fd na zm\u011bny v transportu tepla.<\/span><\/p>\n<p><span dir=\"auto\">Je ironi\u00ed, \u017ee studie je prezentov\u00e1na v kontextu validace modelu. Dansgaardovy a Oeschgerovy ud\u00e1losti maj\u00ed slou\u017eit jako testovac\u00ed p\u0159\u00edpad, kter\u00fd by prozkoumal, zda modern\u00ed klimatick\u00e9 modely dok\u00e1\u017e\u00ed p\u0159esn\u011b simulovat rychl\u00e9 region\u00e1ln\u00ed klimatick\u00e9 zm\u011bny. Pr\u00e1v\u011b v tom spo\u010d\u00edvaj\u00ed zn\u00e1m\u00e9 slabiny: region\u00e1ln\u00ed vzorce, sez\u00f3nn\u00ed v\u00fdkyvy a n\u00e1hl\u00e9 body zlomu jsou pova\u017eov\u00e1ny za obzvl\u00e1\u0161t\u011b n\u00e1ro\u010dn\u00e9. Pokud modely nemohou realisticky znovu vytvo\u0159it minulost, spolehlivost dlouhodob\u00fdch projekc\u00ed se nevyhnuteln\u011b st\u00e1v\u00e1 ot\u00e1zkou.<\/span><\/p>\n<p><span dir=\"auto\">Sami auto\u0159i zd\u016fraz\u0148uj\u00ed, \u017ee mezi zm\u011bnami teploty a vlhkosti neexistoval glob\u00e1ln\u011b jednotn\u00fd vztah. Klimatick\u00fd syst\u00e9m se v jednotliv\u00fdch regionech choval odli\u0161n\u011b, komplexn\u00edm, neline\u00e1rn\u00edm a n\u011bkdy dokonce protich\u016fdn\u00fdm zp\u016fsobem. To op\u011bt bo\u0159\u00ed \u0161iroce roz\u0161\u00ed\u0159en\u00fd klimatick\u00fd narativ. M\u00edsto toho, aby se tyto p\u0159edpoklady potvrdily, jak se o\u010dek\u00e1valo, byly sp\u00ed\u0161e vyvr\u00e1ceny.<\/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>Nov\u00e9 rekonstrukce pylu ukazuj\u00ed, \u017ee b\u011bhem posledn\u00ed doby ledov\u00e9 do\u0161lo k glob\u00e1ln\u00edm teplotn\u00edm v\u00fdkyv\u016fm, kter\u00e9&#8230;<\/p>\n","protected":false},"author":2,"featured_media":99528,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[2692,9196,873,1503],"_links":{"self":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts\/99527"}],"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=99527"}],"version-history":[{"count":0,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/posts\/99527\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/media\/99528"}],"wp:attachment":[{"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/media?parent=99527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/categories?post=99527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.infokuryr.cz\/n\/wp-json\/wp\/v2\/tags?post=99527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}