{"id":42539,"date":"2026-01-29T11:38:02","date_gmt":"2026-01-29T10:38:02","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=42539"},"modified":"2026-01-29T11:38:04","modified_gmt":"2026-01-29T10:38:04","slug":"smaltande-isar-i-antarktis-oroar-rekordvarmt-2025","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/smaltande-isar-i-antarktis-oroar-rekordvarmt-2025\/","title":{"rendered":"Sm\u00e4ltande isar i Antarktis oroar \u2013 rekordvarmt 2025"},"content":{"rendered":"\n

\u00c5r 2025 blev det tredje varmaste \u00e5ret som registrerats. Det sl\u00e5r EU:s klimattj\u00e4nst Copernicus fast i en ny rapport. F\u00f6r f\u00f6rsta g\u00e5ngen har planetens medeltemperatur legat \u00f6ver 1,5 graders uppv\u00e4rmning under tre sammanh\u00e4ngande \u00e5r.<\/strong><\/p>\n\n\n\n

En av platserna d\u00e4r det m\u00e4rks som mest \u00e4r Antarktis.<\/strong><\/p>\n\n\n\n

Text: Amanda Saveland<\/sup><\/p>\n\n\n\n

– Det \u00e4r m\u00e5nga meters potentiell havsh\u00f6jning som finns i de d\u00e4r isarna. S\u00e5 det g\u00f6r att det k\u00e4nns extra allvarligt att Antarktis nu ocks\u00e5 b\u00f6rjar p\u00e5verkas s\u00e5 tydligt och kraftigt av den h\u00e4r temperatur\u00f6kningen, s\u00e4ger Erik Kjellstr\u00f6m, professor i klimatologi vid SMHI.<\/p>\n\n\n\n

Till skillnad fr\u00e5n Arktis, d\u00e4r forskarna sett en kraftig temperatur\u00f6kning under flera decennier, har trenden inte varit lika tydlig i Antarktis. F\u00f6rst under det senaste decenniet har havsisen runt kontinenten b\u00f6rjat minska, och \u00e5r 2025 blev det rekordvarmt.<\/p>\n\n\n\n

F\u00f6rra \u00e5ret var medeltemperaturen i Antarktis 1,06 grader h\u00f6gre \u00e4n under perioden 1991-2020. S\u00e5 stor avvikelse har aldrig uppm\u00e4tts tidigare, och under i stort sett hela \u00e5ret var utbredningen av havsis l\u00e5ngt under genomsnittet.<\/p>\n\n\n\n

\"\"
Erreca kanalen mellan \u00f6n Ronge och Graham omr\u00e5det i Antarktis. <\/figcaption><\/figure>\n\n\n\n

S\u00e5rbara glaci\u00e4rer sm\u00e4lter<\/strong><\/h2>\n\n\n\n

– Vi vet att \u00e4ven Antarktis landisar \u00e4r delvis k\u00e4nsliga f\u00f6r den h\u00e4r uppv\u00e4rmningen, och att delar av dem kan b\u00f6rja p\u00e5verkas alltmer av framf\u00f6rallt varmt havsvatten, s\u00e4ger Erik Kjellstr\u00f6m.<\/p>\n\n\n\n

En av de mest s\u00e5rbara glaci\u00e4rerna \u00e4r den s\u00e5 kallade Domedagsglaci\u00e4ren, Thwaites, i V\u00e4stantarktis. D\u00e4r har tidigare forskning visat att varmt havsvatten b\u00f6rjat tr\u00e4nga in under glaci\u00e4ren, vilket kan leda till att den is som i dag vilar p\u00e5 havsbottnen eroderar och ist\u00e4llet b\u00f6rjar flyta. N\u00e5got som i sin tur kan f\u00e5 avsm\u00e4ltningen att accelerera.<\/p>\n\n\n\n

– Om stora delar av de h\u00e4r k\u00e4nsliga isarna p\u00e5 V\u00e4stantarktis skulle sm\u00e4lta, d\u00e5 pratar vi om 4-5 meter i havsniv\u00e5h\u00f6jning. Kanske till och med \u00e4nnu mer. Och det finns risk att det kan g\u00e5 p\u00e5 ett par hundra \u00e5r, vilket i sammanhanget \u00e4r fort och kommer leda till mycket stora problem med klimatanpassning, s\u00e4ger Erik Kjellstr\u00f6m.\u00a0\u00a0<\/p>\n\n\n\n

\"\"
En grupp pingviner i Antarktis. <\/figcaption><\/figure>\n\n\n\n

Varmaste La Ni\u00f1a-\u00e5ret som uppm\u00e4tts<\/strong><\/h2>\n\n\n\n

Ett annat utm\u00e4rkande drag f\u00f6r \u00e5r 2025 var att havsytans temperatur f\u00f6rblev historiskt h\u00f6g. De enda \u00e5ren som varit varmare \u00e4r 2023 och 2024, d\u00e5 flera v\u00e4rmerekord slogs i v\u00e4rldshaven. Temperaturer som intensifierades av v\u00e4derfenomenet El Ni\u00f1o.<\/p>\n\n\n\n

– Det p\u00e5verkar d\u00e5 havsytans temperatur \u00f6ver framf\u00f6rallt tropiska Stilla havet. Och det \u00e4r s\u00e5 stora havsomr\u00e5den det handlar om att avvikelsen faktiskt oftast syns i den globala medeltemperaturen, f\u00f6rklarar Erik Kjellstr\u00f6m.<\/p>\n\n\n\n

De h\u00f6ga havsyttemperaturerna \u00f6ver Stilla havet kan dra upp den globala medeltemperaturen med en tiondel, ibland mer, och var under 2023 och 2024 kraftiga. Men f\u00f6rra \u00e5ret var det ist\u00e4llet det motsatta v\u00e4derf\u00f6rh\u00e5llandet, La Ni\u00f1a, som r\u00e5dde.<\/p>\n\n\n\n

– D\u00e5 \u00e4r det ist\u00e4llet det omv\u00e4nda. Att det \u00e4r kallare \u00e4n i medeltal i stora omr\u00e5den i \u00f6stra Stilla havet, s\u00e4ger Erik Kjellstr\u00f6m.<\/p>\n\n\n\n

Trots det blev f\u00f6rra \u00e5ret det tredje varmaste som uppm\u00e4tts.<\/p>\n\n\n\n

– Och det \u00e4r ocks\u00e5 ett tydligt tecken p\u00e5 att det h\u00e5ller p\u00e5 att bli varmare. Att vi \u00e4ven under ett La Ni\u00f1a-\u00e5r f\u00e5r en v\u00e4ldigt h\u00f6g global medeltemperatur.<\/p>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n\n\n\n

Om Deep Sea Reporter:<\/sup> <\/strong>V\u00e5r ambition \u00e4r att granska och skildra fr\u00e5gor som r\u00f6r havet och det liv som finns under ytan. Vi verkar i allm\u00e4nhetens tj\u00e4nst och drivs sj\u00e4lvst\u00e4ndigt i f\u00f6rh\u00e5llande till politiska, kommersiella och andra intressen i samh\u00e4llet.<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c5r 2025 blev det tredje varmaste \u00e5ret som registrerats. Det sl\u00e5r EU:s klimattj\u00e4nst Copernicus fast i en ny rapport. F\u00f6r f\u00f6rsta g\u00e5ngen har planetens medeltemperatur legat \u00f6ver 1,5 graders uppv\u00e4rmning under tre sammanh\u00e4ngande \u00e5r. <\/p>\n

En av platserna d\u00e4r det m\u00e4rks som mest \u00e4r Antarktis. <\/p>\n","protected":false},"author":4,"featured_media":42542,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[580,244],"tags":[705,1288,339,3101,1289,1394],"class_list":["post-42539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internationellt","category-klimat-och-miljo","tag-antarktis","tag-el-nino","tag-klimatforandringar","tag-krympande-havsis","tag-la-nina","tag-varmare-hav"],"acf":[],"yoast_head":"\nSm\u00e4ltande isar i Antarktis oroar \u2013 rekordvarmt 2025 - Deep Sea Reporter<\/title>\n<meta name=\"description\" content=\"\u00c5r 2025 blev det tredje varmaste \u00e5ret som registrerats. Det sl\u00e5r EU:s klimattj\u00e4nst Copernicus fast i en ny rapport. 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