{"id":31152,"date":"2023-11-27T13:05:17","date_gmt":"2023-11-27T12:05:17","guid":{"rendered":"https:\/\/www.deepseareporter.com\/?p=31152"},"modified":"2025-03-03T11:02:19","modified_gmt":"2025-03-03T10:02:19","slug":"varldens-storsta-isberg-pa-drift","status":"publish","type":"post","link":"https:\/\/www.deepseareporter.com\/sv\/varldens-storsta-isberg-pa-drift\/","title":{"rendered":"V\u00e4rldens st\u00f6rsta isberg p\u00e5 drift"},"content":{"rendered":"\n

V\u00e4rldens st\u00f6rsta isberg, med en yta p\u00e5 n\u00e4rmare 4 000 kvadratkilometer, har b\u00f6rjat driva igen efter att ha suttit fast i \u00e5rtionden.<\/strong><\/p>\n\n\n\n

\"\"
V\u00e4rldens st\u00f6rsta isberg \u00e4r p\u00e5 drift fr\u00e5n Antarktis. Grafik: Johan Halln\u00e4s<\/figcaption><\/figure>\n\n\n\n

Det v\u00e4ldiga isberget, som kallas A23a, br\u00f6ts loss fr\u00e5n Antarktis kant redan 1986. Men det gick snabbt p\u00e5 grund i Weddelhavet. Och d\u00e4r har det suttit fast fram till f\u00f6r n\u00e5gra \u00e5r sedan.<\/p>\n\n\n\n

Jag m\u00e4rkte den f\u00f6rsta r\u00f6relsen 2020, s\u00e4ger Andrew Fleming, forskare vid British Antarctic Survey, till\u00a0BBC<\/a>.<\/p>\n\n\n\n

Isberget har en yta st\u00f6rre \u00e4n Gotland, vars yta \u00e4r n\u00e4rmare 3 200 kvadratkilometer, och \u00e4r omkring 400 meter tjockt.<\/p>\n\n\n\n

– De h\u00e4r stora isbergen kommer fr\u00e5n de j\u00e4ttestora shelfisar som finns kring Antarktis. Shelfisarna bildas n\u00e4r inlandsisen str\u00f6mmar mot kusten och havet, s\u00e4ger Nina Kirchner, docent i glaciologi och f\u00f6rest\u00e5ndare f\u00f6r Tarfala forskningsstation vid Stockholms universitet, till TT.<\/p>\n\n\n\n

B\u00f6rjat r\u00f6ra sig<\/h2>\n\n\n\n

De senaste m\u00e5naderna har A23a b\u00f6rjat r\u00f6ra sig lite fortare p\u00e5 grund av str\u00f6mmar och vind.<\/p>\n\n\n\n

Att isberget b\u00f6rjat r\u00f6ra p\u00e5 sig igen efter att ha suttit fast sedan 1986 \u00e4r inte s\u00e5 konstigt.<\/p>\n\n\n\n

– F\u00f6rr eller senare kommer de alltid lossna, \u00e4ven de h\u00e4r megabergen. De bryts ju sakta ner, men det \u00e4r ju ett enormt stort isberg s\u00e5 det tar ju l\u00e5ng tid, s\u00e4ger Ola Kal\u00e9n, oceanograf vid SMHI, till TT.<\/p>\n\n\n\n

Han s\u00e4ger att det antagligen fr\u00e4mst \u00e4r p\u00e5verkan av v\u00e4rmen fr\u00e5n havsstr\u00f6mmar som g\u00f6r att isberget eroderat underifr\u00e5n och p\u00e5 sidan som g\u00f6r att det har lossnat nu.<\/p>\n\n\n\n

Sm\u00e4lter s\u00e5 sm\u00e5ningom<\/h2>\n\n\n\n

Isberget kommer nu f\u00f6rmodligen att driva ut i ett omr\u00e5de norr om den antarktiska halv\u00f6n d\u00e4r m\u00e5nga isberg samlas. I s\u00e5 fall f\u00e5ngas det upp av en kraftig havsstr\u00f6m.<\/p>\n\n\n\n

– Den g\u00e5r medsols runt Antarktis. D\u00e4r transporteras de l\u00e4ngre ut och g\u00e5r mot varmare vatten, bryts upp och sm\u00e4lter med tiden, s\u00e4ger Ola Kal\u00e9n.<\/p>\n\n\n\n

En annan m\u00f6jlighet \u00e4r att A23a kan fastna p\u00e5 nytt, men det beror p\u00e5 hur bottenf\u00f6rh\u00e5llandena ser ut och hur str\u00f6mmarna g\u00e5r.<\/p>\n","protected":false},"excerpt":{"rendered":"

V\u00e4rldens st\u00f6rsta isberg, med en yta p\u00e5 n\u00e4rmare 4 000 kvadratkilometer, har b\u00f6rjat driva igen efter att ha suttit fast i \u00e5rtionden.<\/p>\n","protected":false},"author":4,"featured_media":31094,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[244],"tags":[705,1603,1605,1604],"class_list":["post-31152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-klimat-och-miljo","tag-antarktis","tag-isberg","tag-varma-havsstrommar","tag-weddelhavet"],"acf":[],"yoast_head":"\nV\u00e4rldens st\u00f6rsta isberg p\u00e5 drift - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"V\u00e4rldens st\u00f6rsta isberg, med en yta p\u00e5 n\u00e4rmare 4 000 kvadratkilometer, har b\u00f6rjat driva igen efter att ha suttit fast i \u00e5rtionden.\" \/>\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.deepseareporter.com\/sv\/varldens-storsta-isberg-pa-drift\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"V\u00e4rldens st\u00f6rsta isberg p\u00e5 drift - 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