{"id":37853,"date":"2025-09-26T14:52:56","date_gmt":"2025-09-26T12:52:56","guid":{"rendered":"https:\/\/www.co2news.sk\/?p=37853"},"modified":"2025-09-26T14:55:26","modified_gmt":"2025-09-26T12:55:26","slug":"novy-mechanizmus-ktory-meni-globalne-oteplenie-na-doby-ladove","status":"publish","type":"post","link":"https:\/\/www.co2news.sk\/ar\/2025\/09\/26\/novy-mechanizmus-ktory-meni-globalne-oteplenie-na-doby-ladove\/","title":{"rendered":"Nov\u00fd mechanizmus, ktor\u00fd men\u00ed glob\u00e1lne oteplenie na doby \u013eadov\u00e9"},"content":{"rendered":"

Geologick\u00e1 regul\u00e1cia zemskej kl\u00edmy v \u010dasov\u00fdch horizontoch stoviek tis\u00edc rokov je k\u013e\u00fa\u010dovou t\u00e9mou v pr\u00edrodn\u00fdch ved\u00e1ch, ktor\u00e1 m\u00e1 d\u00f4sledky pre v\u00fdvoj \u017eivota aj pre dlhodob\u00e9 dopady antropog\u00e9nnych emisi\u00ed uhl\u00edka. Prevl\u00e1da n\u00e1zor, \u017ee stabiliz\u00e1cia kl\u00edmy prebieha prostredn\u00edctvom negat\u00edvnej, stabilizuj\u00facej sp\u00e4tnej v\u00e4zby<\/strong> \u2013 planet\u00e1rneho klimatick\u00e9ho \u201etermostatu\u201c \u2013 kde klimaticky citliv\u00e9 zvetr\u00e1vanie silik\u00e1tov\u00fdch horn\u00edn na pevnine odstra\u0148uje atmosf\u00e9rick\u00fd oxid uhli\u010dit\u00fd.<\/p>\n

Hoci tento mechanizmus funguje ako prim\u00e1rna regul\u00e1cia, Dominik H\u00fclse a Andy Ridgwell predstavili v\u00fdsledky modelov, ktor\u00e9 nazna\u010duj\u00fa, \u017ee t\u00e1to stabiliz\u00e1cia m\u00f4\u017ee by\u0165 prekonan\u00e1 r\u00fdchlej\u0161\u00edmi procesmi<\/strong>. Epizodick\u00fd v\u00fdskyt extr\u00e9mneho ochladzovania a udalost\u00ed \u201esnehovej gule Zeme\u201c (Snowball Earth) po\u010das prekambria (pred 539 mili\u00f3nmi rokov) nazna\u010duje, \u017ee v minulosti mohla \u00fa\u010dinn\u00e1 regul\u00e1cia zlyh\u00e1va\u0165. Historick\u00fd v\u00fdskyt rozsiahleho ukladania organick\u00e9ho uhl\u00edka nazna\u010duje p\u00f4sobenie \u010fal\u0161ieho planet\u00e1rneho mechanizmu odstra\u0148ovania $\\text{CO}_2$ a potenci\u00e1lne aj druh\u00e9ho termostatu.<\/p>\n

Autori sa zamerali na povahu interakcie medzi zvetr\u00e1van\u00edm a ukladan\u00edm organick\u00e9ho uhl\u00edka, \u010do bolo predt\u00fdm nezn\u00e1me kv\u00f4li nedostatku vhodn\u00fdch glob\u00e1lnych modelov uhl\u00edkov\u00e9ho cyklu. Pou\u017eili efekt\u00edvny model, ktor\u00fd u\u017e zah\u0155\u0148al termostat silik\u00e1tov\u00e9ho zvetr\u00e1vania a doplnili do neho k\u013e\u00fa\u010dov\u00e9 organick\u00e9 geologick\u00e9 procesy, ako je uuvo\u013e\u0148ovanie CO2 zo zvetr\u00e1vania kerog\u00e9nu a jeho odstra\u0148ovanie ukladan\u00edm organick\u00e9ho uhl\u00edka v morsk\u00fdch sedimentoch. Zahrnuli tie\u017e fosfor (P), ktor\u00fd reguluje dostupnos\u0165 \u017eiv\u00edn pre morsk\u00fd plankt\u00f3n, a t\u00fdm aj produkciu a ukladanie organick\u00e9ho uhl\u00edka.<\/p>\n

Zistenia ukazuj\u00fa, \u017ee termostat zalo\u017een\u00fd na organickom uhl\u00edku m\u00f4\u017ee by\u0165 citlivej\u0161\u00ed a prev\u00e1\u017ei\u0165 silik\u00e1tov\u00fd zvetr\u00e1vac\u00ed termostat, \u010d\u00edm za\u010dne dominova\u0165 v dlhodobej regul\u00e1cii kl\u00edmy. Model simuloval reakciu na po\u010diato\u010dn\u00e9 mas\u00edvne uvo\u013e\u0148ovanie CO2 a poruchy glob\u00e1lneho otep\u013eovania. V teplej\u0161om a produkt\u00edvnej\u0161om oce\u00e1ne kles\u00e1 rozpustnos\u0165 kysl\u00edka O2 a zvy\u0161uje sa r\u00fdchlos\u0165 rozkladu organickej hmoty, \u010do vedie k \u0161\u00edreniu anoxie<\/strong> na morskom dne.<\/p>\n

V t\u00fdchto anoxick\u00fdch podmienkach sa fosfor (P) recykluje sp\u00e4\u0165 do oce\u00e1nu efekt\u00edvnej\u0161ie, ne\u017e aby bol pochovan\u00fd spolu s uhl\u00edkom. Tento redoxne citliv\u00fd proces regener\u00e1cie fosforu zosil\u0148uje sediment\u00e1rne pochov\u00e1vanie organick\u00e9ho uhl\u00edka, \u010do vedie k e\u0161te vy\u0161\u0161ej produktivite a ni\u017e\u0161\u00edm hladin\u00e1m O2. V d\u00f4sledku toho CO2 kles\u00e1 r\u00fdchlej\u0161ie ako fosfor a glob\u00e1lna povrchov\u00e1 kl\u00edma sa ochladzuje pod svoju po\u010diato\u010dn\u00fa hodnotu.<\/p>\n

T\u00e1to r\u00fdchla sp\u00e4tn\u00e1 v\u00e4zba vytv\u00e1ra neo\u010dak\u00e1van\u00fa klimatick\u00fa nestabilitu<\/strong>. V priebehu nieko\u013ek\u00fdch stotis\u00edc rokov doch\u00e1dza k \u201epodchladeniu\u201c (overcooling). Rozsah tohto podchladenia z\u00e1vis\u00ed od po\u010diato\u010dn\u00e9ho stavu cyklov C a P a pri ni\u017e\u0161\u00edch hladin\u00e1ch O2 v atmosf\u00e9re (60 % s\u00fa\u010dasn\u00fdch \u00farovn\u00ed) m\u00f4\u017ee presiahnu\u0165 6 \u00b0C, \u010do je viac ako glob\u00e1lny teplotn\u00fd rozdiel medzi dne\u0161kom a posledn\u00fdm glaci\u00e1lnym maximom. T\u00e1to nestabilita z\u00e1vis\u00ed od po\u010diato\u010dnej rovnov\u00e1hy medzi dvoma termostatmi.<\/p>\n

Podchladenie je najsilnej\u0161ie v prechodn\u00fdch stavoch okysli\u010denia oce\u00e1nu a atmosf\u00e9ry a pon\u00faka kauz\u00e1lnu s\u00favislos\u0165 medzi hlavn\u00fdmi prechodmi v okysli\u010den\u00ed po\u010das prekambria a v\u00fdskytom extr\u00e9mnych ochladzovac\u00edch udalost\u00ed typu snehovej gule na Zemi. Existencia kritickej nestability v geologickej regul\u00e1cii kl\u00edmy je d\u00f4sledkom pr\u00edtomnosti mikrobi\u00e1lneho \u017eivota<\/strong>. V\u00fdskum H\u00fclse a Ridgwell (Science, 2025) nazna\u010duje, \u017ee je potrebn\u00fd nov\u00fd poh\u013ead na fungovanie zemsk\u00fdch termostatov. JRi<\/p>\n

\n

\u0634\u0631\u0637 <\/span>publikovan\u00fd <\/span><\/a><\/span>v\u00a0<\/span>\u0641\u064a \u0645\u062c\u0644\u0629 \u0633\u0627\u064a\u0646\u0633<\/span><\/i>\u00a0.<\/span><\/p>","protected":false},"excerpt":{"rendered":"

Geologick\u00e1 regul\u00e1cia zemskej kl\u00edmy v \u010dasov\u00fdch horizontoch stoviek tis\u00edc rokov je k\u013e\u00fa\u010dovou t\u00e9mou v pr\u00edrodn\u00fdch ved\u00e1ch, ktor\u00e1 m\u00e1 d\u00f4sledky pre v\u00fdvoj \u017eivota aj pre dlhodob\u00e9 dopady antropog\u00e9nnych emisi\u00ed uhl\u00edka. Prevl\u00e1da n\u00e1zor, \u017ee stabiliz\u00e1cia kl\u00edmy prebieha prostredn\u00edctvom<\/p>","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-37853","post","type-post","status-publish","format-standard","hentry","category-klimaticka-zmena"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/posts\/37853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/comments?post=37853"}],"version-history":[{"count":0,"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/posts\/37853\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/media?parent=37853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/categories?post=37853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.co2news.sk\/ar\/wp-json\/wp\/v2\/tags?post=37853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}