{"id":681600,"date":"2026-03-13T09:06:03","date_gmt":"2026-03-13T09:06:03","guid":{"rendered":"https:\/\/microscopemedia.com\/?p=681600"},"modified":"2026-03-13T09:06:03","modified_gmt":"2026-03-13T09:06:03","slug":"de-ce-au-crescut-nivelurile-globale-de-metan-in-timpul-lockdownurilor-covid","status":"publish","type":"post","link":"https:\/\/microscopemedia.com\/?p=681600","title":{"rendered":"De ce au crescut nivelurile globale de metan \u00een timpul lockdownurilor COVID"},"content":{"rendered":"
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\u00cen 2020, c\u00e2nd numeroase \u021b\u0103ri au impus restric\u021bii pentru a limita r\u0103sp\u00e2ndirea COVID-19, activitatea economic\u0103 a \u00eencetinit considerabil. Traficul rutier a sc\u0103zut, avioanele au r\u0103mas la sol, iar multe fabrici au redus produc\u021bia. Ca rezultat, emisiile globale de CO\u2082 au sc\u0103zut cu aproximativ 7% \u00een acel an. Cu toate acestea, \u00een acela\u0219i timp, nivelurile de metan \u2013 un gaz cu efect de ser\u0103 mult mai puternic dec\u00e2t dioxidul de carbon \u2013 au crescut mai rapid dec\u00e2t \u00een orice alt moment de c\u00e2nd exist\u0103 m\u0103sur\u0103tori moderne, \u00eencep\u00e2nd din anii 1980, arat\u0103 The Conversation<\/a>.<\/p>\n

Cre\u0219terea a continuat \u0219i \u00een anii urm\u0103tori, 2021 \u0219i 2022, ceea ce a ridicat numeroase \u00eentreb\u0103ri \u00een r\u00e2ndul cercet\u0103torilor.<\/p>\n

\u201eAgentul de cur\u0103\u021bare\u201d al atmosferei a devenit mai slab<\/h2>\n

Potrivit unui studiu publicat \u00een revista Science, principala explica\u021bie are leg\u0103tur\u0103 cu o reac\u021bie chimic\u0103 din atmosfer\u0103. Atmosfera con\u021bine radicalul hidroxil (OH), o substan\u021b\u0103 care descompune metanul \u0219i care este descris\u0103 de cercet\u0103tori drept \u201eagentul de cur\u0103\u021bare al atmosferei\u201d. Acest radical se formeaz\u0103 printr-un lan\u021b complex de reac\u021bii chimice care implic\u0103 poluan\u021bi precum oxizii de azot (NOx), proveni\u021bi \u00een mare parte din procesele de combustie \u2013 de exemplu, motoarele ma\u0219inilor sau activitatea industrial\u0103.<\/p>\n

\u00cen timpul lockdownurilor, emisiile de NOx au sc\u0103zut semnificativ. Ca urmare, cantitatea de radicali hidroxil din atmosfer\u0103 a fost mai mic\u0103, ceea ce a redus capacitatea atmosferei de a descompune metanul. \u201eC\u00e2nd emisiile de NOx scad, se produce mai pu\u021bin OH. Asta \u00eenseamn\u0103 mai pu\u021bin \u2018agent de cur\u0103\u021bare\u2019 \u00een atmosfer\u0103, iar metanul se acumuleaz\u0103 mai repede\u201d, explic\u0103 Philippe Ciais, cercet\u0103tor la Laboratorul pentru \u0218tiin\u021ba Climei \u0219i Mediului din cadrul Universit\u0103\u021bii Paris-Saclay.<\/p>\n

Alte surse de metan au contribuit la cre\u0219tere<\/h2>\n

Studiul arat\u0103 c\u0103 aproximativ 80% din cre\u0219terea nivelului de metan a fost cauzat\u0103 de reducerea radicalilor hidroxil. Totu\u0219i, cercet\u0103torii spun c\u0103 \u0219i alte surse au contribuit la fenomen, inclusiv emisiile din zonele umede naturale \u0219i din agricultur\u0103. Metanul este emis, de exemplu, de solurile ml\u0103\u0219tinoase, de fermele zootehnice \u0219i de procesele de descompunere a materiei organice.<\/p>\n

Cercet\u0103torii subliniaz\u0103 c\u0103 descoperirea nu \u00eenseamn\u0103 c\u0103 poluarea ar trebui men\u021binut\u0103 pentru a controla metanul. Dimpotriv\u0103, studiul arat\u0103 c\u00e2t de complex este sistemul climatic \u0219i c\u00e2t de important\u0103 este reducerea direct\u0103 a emisiilor de metan. \u201eNu vom reduce metanul continu\u00e2nd s\u0103 polu\u0103m mai mult. Solu\u021bia real\u0103 este s\u0103 reducem emisiile de metan\u201d, spune Philippe Ciais.<\/p>\n

Potrivit speciali\u0219tilor, limitarea acestui gaz cu efect de ser\u0103 este una dintre cele mai rapide modalit\u0103\u021bi de a \u00eencetini \u00eenc\u0103lzirea global\u0103<\/a> \u00een urm\u0103toarele decenii.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00cen 2020, c\u00e2nd numeroase \u021b\u0103ri au impus restric\u021bii pentru a limita r\u0103sp\u00e2ndirea COVID-19, activitatea economic\u0103 a \u00eencetinit considerabil. Traficul rutier a sc\u0103zut, avioanele au r\u0103mas la sol, iar multe fabrici … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":681601,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"Default","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/681600"}],"collection":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=681600"}],"version-history":[{"count":0,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/posts\/681600\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=\/wp\/v2\/media\/681601"}],"wp:attachment":[{"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=681600"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=681600"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microscopemedia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=681600"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}