{"id":13092,"date":"2021-07-08T11:00:00","date_gmt":"2021-07-08T14:00:00","guid":{"rendered":"https:\/\/mindthegraph.com\/blog\/?p=13092"},"modified":"2023-01-05T13:48:01","modified_gmt":"2023-01-05T16:48:01","slug":"arctic-sea-ice-thinning-in-the-fast-lane","status":"publish","type":"post","link":"https:\/\/mindthegraph.com\/blog\/nb\/arktisk-hav-is-tynning-i-hurtigfilen\/","title":{"rendered":"Tynning av havisen i Arktis, i overhalingsbanen"},"content":{"rendered":"

Arktis tynnes ut to ganger raskere enn forventet.<\/strong><\/h2>\n\n\n\n

En oppdatert modell viser at havisen langs kysten av Arktis minker to ganger raskere enn forventet.<\/p>\n\n\n\n

Naturen forringes i takt med den \u00f8kende globale oppvarmingen og klimaendringene. Isen p\u00e5 polene smelter raskt, noe som f\u00f8rer til tap av biologisk mangfold og skaper bekymring for havniv\u00e5et.<\/p>\n\n\n\n

Sjekk ut Mind the Graph-galleriet<\/a> for illustrasjoner relatert til havis. Klikk p\u00e5 bildet nedenfor!<\/p>\n\n\n\n

\"illustrasjoner<\/a><\/figure>\n\n\n\n

Tykkelsen p\u00e5 havisen fungerer som et barometer for \u00e5 forst\u00e5 tilstanden i Arktis. Jo tykkere isen er, desto mer varmeisolerende er den, noe som forhindrer at temperaturen p\u00e5 havoverflaten stiger om vinteren og beskytter mot varme om sommeren.<\/p>\n\n\n\n

Det er ogs\u00e5 mindre sannsynlig at den arktiske sommersmeltingen opprettholdes av tynnere is.<\/p>\n\n\n\n

Forskere har derfor evaluert resultatene fra et nyutviklet dataprogram som skal estimere forskjellen i sn\u00f8dybde fra \u00e5r til \u00e5r, og identifisert tynning av havisen<\/strong> akselererte mye mer enn forventet.<\/p>\n\n\n\n

Studiens form\u00e5l og m\u00e5l<\/strong><\/h2>\n\n\n\n

Siden havisdekket modererer luft-vann-utvekslingen og varmeoverf\u00f8ringen mellom havene og atmosf\u00e6ren, har det betydning for regionale \u00f8kosystemer, vindm\u00f8nstre p\u00e5 halvkulen og det globale klimaet.<\/p>\n\n\n\n

Med tykkere havis \u00f8ker den termiske isolasjonen, slik at temperaturene holder seg lavere om vinteren.<\/p>\n\n\n\n

Det er ogs\u00e5 tykkelsen p\u00e5 havisen under sn\u00f8akkumulasjonen som bestemmer havisens dybde under vannoverflaten, noe som bidrar vesentlig til den termodynamiske veksten av havisen. Tykkelsen p\u00e5 havisen er derfor en viktig indikator p\u00e5 regionens helsetilstand. <\/p>\n\n\n\n

Forskerne brukte CryoSat-2<\/a> satellittradar for \u00e5 m\u00e5le tykkelsen p\u00e5 havisen i denne studien.<\/p>\n\n\n\n

M\u00e5let var \u00e5 sammenligne tilgjengelige data fra den gamle modellen med en ny modell som inkluderte klimaendringer.<\/p>\n\n\n\n

H\u00f8yden p\u00e5 isen over vannet kan beregnes ved \u00e5 ta tid p\u00e5 hvor lang tid det tar for radarb\u00f8lgene \u00e5 reflekteres, og dermed f\u00e5 et estimat p\u00e5 isens tykkelse.<\/p>\n\n\n\n

SnowModel-LG, en lagrangsk sn\u00f8akkumuleringsmodell, ble brukt til \u00e5 forutsi den totale sn\u00f8dybden og tettheten p\u00e5 ulike steder rundt Polhavet ved \u00e5 ta hensyn til vind, temperatur, nedb\u00f8r og isbevegelsesanalyse.<\/p>\n\n\n\n

Deretter ble resultatene fra sn\u00f8modellen kombinert med data fra satellittradar for \u00e5 estimere hvor raskt tykkelsen p\u00e5 havisen i Arktis minker, og hvordan den kan variere over tid.<\/p>\n\n\n\n

\"stor<\/a>
Bildekilde: Unsplash<\/a> av Cassie Matias<\/a><\/figcaption><\/figure>\n\n\n\n

Som et resultat av dette:<\/strong><\/h2>\n\n\n\n

En faktor p\u00e5 50 prosent ble lagt til variasjonen i havistykkelsen i randomr\u00e5dene ved \u00e5 inkludere variasjonen i sn\u00f8dekket.<\/p>\n\n\n\n

If\u00f8lge studien bidrar variasjoner i sn\u00f8dekket til en stadig st\u00f8rre del av variasjonen i den antatte tykkelsen p\u00e5 havisen, og \u00f8ker fra rundt 20% til mer enn 70% p\u00e5 sesongbasis.<\/p>\n\n\n\n

Sn\u00f8modell-LG-datadrevne trender ble ogs\u00e5 observert i statistikken over tykkelsen p\u00e5 havisen, noe som forsterket nedgangen i omr\u00e5der der den allerede var der, og f\u00f8rte til betydelige tap p\u00e5 steder der den ikke var der fra f\u00f8r.<\/p>\n\n\n\n

\u00d8kende karbonavtrykk f\u00f8rer til at innlandsisen minker fordi menneskene har \u00f8kt antallet aktiviteter som p\u00e5virker milj\u00f8et betydelig. Flere dyrearter i polaromr\u00e5dene har ogs\u00e5 mistet leveomr\u00e5der p\u00e5 grunn av issmeltingen. Den integrerte modellen deres, som bygger bro mellom utdaterte analysesystemer og tar hensyn til faktorer som klimaendringer, gir en helhetlig tiln\u00e6rming til \u00e5 evaluere tykkelsen p\u00e5 havisen.<\/p>\n\n\n\n

Forskningen deres er en viktig milep\u00e6l som definitivt kan bidra til et st\u00f8rre bilde av den virkelige \u00e5rsaken.<\/p>\n\n\n\n

Hvis du vil vite mer om forskningen deres, kan du sjekke ut referansen som er nevnt nedenfor. <\/p>\n\n\n\n

Robbie D. C. Mallett, Julienne C. Stroeve, Michel Tsamados, Jack C. Landy, Rosemary Willatt, Vishnu Nandan, Glen E. Liston. Raskere nedgang og st\u00f8rre variasjon i havistykkelsen i de marginale arktiske havene n\u00e5r man tar hensyn til dynamisk sn\u00f8dekke. Kryosf\u00e6ren, 2021; 15 (5): 2429<\/a> DOI: 10.5194\/tc-15-2429-2021<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Arktis tynnes ut to ganger raskere enn forventet. En oppdatert modell tyder p\u00e5 at havisen langs kysten av Arktis minker to ganger raskere enn forventet. Naturen forringes i takt med \u00f8kende global oppvarming og klimaendringer. Den raske smeltingen av polarisene f\u00f8rer til tap av biologisk mangfold og vekker bekymring [...].<\/p>","protected":false},"author":18,"featured_media":13111,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[959,28],"tags":[554],"yoast_head":"\nArctic Sea Ice Thinning, in the Fast Lane - MTG<\/title>\n<meta name=\"description\" content=\"Nature is deteriorating with increasing global warming and climatic changes, and the sea ice along the coasts of the Arctic is thinning two times faster than expected.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mindthegraph.com\/blog\/nb\/arktisk-hav-is-tynning-i-hurtigfilen\/\" \/>\n<meta property=\"og:locale\" content=\"nb_NO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Arctic Sea Ice Thinning, in the Fast Lane\" \/>\n<meta property=\"og:description\" content=\"Nature is deteriorating with increasing global warming and climatic changes, and the sea ice along the coasts of the Arctic is thinning two times faster than expected.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mindthegraph.com\/blog\/nb\/arktisk-hav-is-tynning-i-hurtigfilen\/\" \/>\n<meta property=\"og:site_name\" content=\"Mind the Graph Blog\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-08T14:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-01-05T16:48:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2021\/07\/post-thinning-arctic-sea-facebook-01.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"628\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bruna Soldera\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Arctic Sea Ice Thinning, in the Fast Lane\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/mindthegraph.com\/blog\/wp-content\/uploads\/2021\/07\/post-thinning-arctic.jpg\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bruna Soldera\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Arctic Sea Ice Thinning, in the Fast Lane - 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