{"id":91254,"date":"2024-06-19T22:35:59","date_gmt":"2024-06-19T19:35:59","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=91254"},"modified":"2024-06-19T22:35:59","modified_gmt":"2024-06-19T19:35:59","slug":"cercetatorii-au-ramas-perplecsi-nucleul-pamantului-a-incetinit-putin-din-rotatie-iar-asta-scurteaza-durata-zilei","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/cercetatorii-au-ramas-perplecsi-nucleul-pamantului-a-incetinit-putin-din-rotatie-iar-asta-scurteaza-durata-zilei\/","title":{"rendered":"Cercet\u0103torii au r\u0103mas perplec\u015fi: nucleul P\u0103m\u00e2ntului a \u00eencetinit pu\u0163in din rota\u0163ie, iar asta scurteaz\u0103 durata zilei"},"content":{"rendered":"<figure id=\"attachment_91256\" aria-describedby=\"caption-attachment-91256\" style=\"width: 348px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/nucleul-Pamantului.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-91256\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/nucleul-Pamantului.jpg\" alt=\"\" width=\"358\" height=\"323\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/nucleul-Pamantului.jpg 358w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/nucleul-Pamantului-300x271.jpg 300w\" sizes=\"auto, (max-width: 358px) 100vw, 358px\" \/><\/a><figcaption id=\"caption-attachment-91256\" class=\"wp-caption-text\">Imagine generata de Microsoft AI<\/figcaption><\/figure>\n<p>Miezul (nucleul) interior al planetei noastre a \u00eenceput s\u0103 se roteasc\u0103 din ce \u00een ce mai lent, arat\u0103 noi cercet\u0103ri. \u015ei acest lucru ar putea schimba durata zilei, sugereaz\u0103 un studiu publicat \u00een revista <strong><em>&#8222;Nature&#8221;<\/em><\/strong>.<\/p>\n<p>\u00cen compara\u021bie cu viteza suprafe\u021bei P\u0103m\u00e2ntului, se credea anterior c\u0103 miezul interior se \u00eenv\u00e2rte mai repede. Cu toate acestea, din 2010 a \u00eenceput s\u0103 \u00eencetineasc\u0103, potrivit unui nou articol publicat \u00een revista <strong><em>&#8222;Nature&#8221;<\/em><\/strong>.\u00a0 John Vidale, profesor de \u0218tiin\u021be ale P\u0103m\u00e2ntului la Colegiul de Litere, Arte \u0219i \u0218tiin\u021be de la Universitatea din California de Sud (USC), a declarat \u00eentr-un comunicat: <em>&#8222;C\u00e2nd am v\u0103zut prima dat\u0103 seismogramele care indic\u0103 aceast\u0103 schimbare, am r\u0103mas perplex. Dar c\u00e2nd am g\u0103sit mai multe observa\u021bii care indic\u0103 acela\u0219i model, rezultatul a fost inevitabil. Miezul interior \u00eencetinise pentru prima dat\u0103 \u00een multe decenii. Al\u021bi oameni de \u0219tiin\u021b\u0103 au sus\u021binut recent modele similare \u0219i diferite, dar cel mai recent studiu al nostru ofer\u0103 cea mai conving\u0103toare rezolu\u021bie&#8221;<\/em>.<\/p>\n<figure id=\"attachment_91255\" aria-describedby=\"caption-attachment-91255\" style=\"width: 529px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/dezaccelerarea-nucleului-interior.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-91255\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/dezaccelerarea-nucleului-interior.jpg\" alt=\"\" width=\"539\" height=\"301\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/dezaccelerarea-nucleului-interior.jpg 539w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/06\/dezaccelerarea-nucleului-interior-300x168.jpg 300w\" sizes=\"auto, (max-width: 539px) 100vw, 539px\" \/><\/a><figcaption id=\"caption-attachment-91255\" class=\"wp-caption-text\"><strong>Imagine:<\/strong> USC Graphic \/ Edward Sotelo<\/figcaption><\/figure>\n<p>P\u0103m\u00e2ntul este alc\u0103tuit din mai multe straturi, clasificate \u00een scoar\u0163\u0103 (crust\u0103), manta, nucleul exterior (miezul exterior) \u015fi nucleul interior (miezul interior). Scoar\u0163a este stratul cel mai exterior al P\u0103m\u00e2ntului, iar grosimea sa variaz\u0103 \u00eentre 5 \u0219i 60 de kilometri. Sub scoar\u0163\u0103 se afl\u0103 mantaua, care se extinde p\u00e2n\u0103 la aproximativ 1.800 de kilometri ad\u00e2ncime \u0219i este format\u0103 \u00een principal din minerale silicate bogate \u00een fier \u0219i magneziu. Miezul exterior este situat sub manta, la o ad\u00e2ncime cuprins\u0103 \u00eentre 2.896 si 5.149 km, \u015fi este alc\u0103tuit \u00een principal din fier lichid \u015fi nichel, ale c\u0103ror mi\u015fcare genereaz\u0103 c\u00e2mpul magnetic al P\u0103m\u00e2ntului. Miezul interior este cel mai interior strat al P\u0103m\u00e2ntului, cu o raz\u0103 de aproximativ 760 de kilometri &#8211; aproximativ aceea\u0219i dimensiune ca \u0219i Luna &#8211; \u0219i este o minge solid\u0103 de fier \u0219i nichel \u00een centrul planetei noastre.<\/p>\n<p>Datorit\u0103 ad\u00e2ncimii sale imense \u00een P\u0103m\u00e2nt, oamenii de \u0219tiin\u021b\u0103 trebuie s\u0103 se bazeze pe undele seismice de la cutremure pentru a studia mi\u0219carea nucleului interior. \u00cen lucrare, cercet\u0103torii descriu modul \u00een care au analizat datele seismice de la 121 de cutremure repetate \u00eentre 1991 \u0219i 2023 \u00een apropiere de Insulele Sandwich de Sud din Oceanul Atlantic de Sud, precum \u0219i datele din mai multe teste nucleare. Ei au descoperit c\u0103 miezul interior \u0219i-a \u00eencetinit rota\u021bia ca urmare a agita\u021biei lichidului din miezul exterior, combinat\u0103 cu atrac\u021bia gravita\u021bional\u0103 a mantalei. Acest lucru poate provoca modific\u0103ri u\u0219oare ale duratei unei zile, dar numai \u00een frac\u021biuni de secund\u0103. Vidale a ad\u0103ugat: <em>&#8222;Este foarte greu de observat, de ordinul unei miimi de secund\u0103, aproape pierdut \u00een zgomotul agita\u021biei oceanelor \u0219i a atmosferei&#8221;.<\/em><\/p>\n<p>Cercet\u0103torii vor continua s\u0103 cerceteze motivele pentru care nucleul \u00eencetine\u0219te \u0219i ce fel de efecte va avea asupra planetei noastre.<\/p>\n<p><strong>Sursa:<\/strong> studiul \u015ftiin\u0163ific <a href=\"https:\/\/www.nature.com\/articles\/s41586-024-07536-4\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;Inner core backtracking by seismic waveform change reversals&#8221; \/ nature.com<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Miezul (nucleul) interior al planetei noastre a \u00eenceput s\u0103 se roteasc\u0103 din ce \u00een ce mai lent, arat\u0103 noi cercet\u0103ri. \u015ei acest lucru ar putea schimba durata zilei, sugereaz\u0103 un studiu publicat \u00een revista &#8222;Nature&#8221;. \u00cen compara\u021bie cu viteza suprafe\u021bei &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Cercet\u0103torii au r\u0103mas perplec\u015fi: nucleul P\u0103m\u00e2ntului a \u00eencetinit pu\u0163in din rota\u0163ie, iar asta scurteaz\u0103 durata zilei\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/cercetatorii-au-ramas-perplecsi-nucleul-pamantului-a-incetinit-putin-din-rotatie-iar-asta-scurteaza-durata-zilei\/#more-91254\" aria-label=\"Cite\u0219te mai multe despre Cercet\u0103torii au r\u0103mas perplec\u015fi: nucleul P\u0103m\u00e2ntului a \u00eencetinit pu\u0163in din rota\u0163ie, iar asta scurteaz\u0103 durata zilei\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":91256,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[1393,1662,4400,727,1941,149,6788,4927,4645,8421,1132,105,2364,9803,2250,1840],"class_list":["post-91254","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-california","tag-camp-magnetic","tag-crusta","tag-cutremure","tag-fier","tag-luna","tag-magneziu","tag-manta","tag-nichel","tag-nucleu","tag-oceanul-atlantic","tag-pamant","tag-revista","tag-stiinta","tag-universitate","tag-viteza","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Cercet\u0103torii au r\u0103mas perplec\u015fi: nucleul P\u0103m\u00e2ntului a \u00eencetinit pu\u0163in din rota\u0163ie, iar asta scurteaz\u0103 durata zilei - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/cercetatorii-au-ramas-perplecsi-nucleul-pamantului-a-incetinit-putin-din-rotatie-iar-asta-scurteaza-durata-zilei\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cercet\u0103torii au r\u0103mas perplec\u015fi: nucleul P\u0103m\u00e2ntului a \u00eencetinit pu\u0163in din rota\u0163ie, iar asta scurteaz\u0103 durata zilei\" \/>\n<meta property=\"og:description\" content=\"Miezul (nucleul) interior al planetei noastre a \u00eenceput s\u0103 se roteasc\u0103 din ce \u00een ce mai lent, arat\u0103 noi cercet\u0103ri. \u015ei acest lucru ar putea schimba durata zilei, sugereaz\u0103 un studiu publicat \u00een revista &#8222;Nature&#8221;. \u00cen compara\u021bie cu viteza suprafe\u021bei ... 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