{"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\/da\/arktisk-hav-is-tynding-i-hurtigbanen\/","title":{"rendered":"Den arktiske havis tynder ud, i overhalingsbanen"},"content":{"rendered":"

Arktis bliver tyndere to gange hurtigere end forventet.<\/strong><\/h2>\n\n\n\n

En opdateret model viser, at havisen langs Arktis' kyster bliver tyndere to gange hurtigere end forventet.<\/p>\n\n\n\n

Naturen forv\u00e6rres med den stigende globale opvarmning og de klimatiske \u00e6ndringer. N\u00e5r polernes is smelter hurtigt, for\u00e5rsager det et tab af biodiversitet og giver ogs\u00e5 anledning til bekymring for havniveauet.<\/p>\n\n\n\n

Tjek ud Mind the Graph Gallery<\/a> for illustrationer relateret til havis. Klik p\u00e5 billedet nedenfor!<\/p>\n\n\n\n

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

Havisens tykkelse fungerer som et barometer til at forst\u00e5 tilstanden i den arktiske region. Jo tykkere isen er, jo mere termisk isolering fungerer den som, hvilket forhindrer havets overfladetemperatur i at stige om vinteren og giver beskyttelse mod varme om sommeren.<\/p>\n\n\n\n

Det er ogs\u00e5 mindre sandsynligt, at den arktiske sommersmeltning underst\u00f8ttes af tyndere is.<\/p>\n\n\n\n

Derfor har forskere evalueret resultaterne fra et nyudviklet computerprogram, der har til form\u00e5l at estimere forskellen i snedybde hvert \u00e5r, og identificeret udtynding af havisen<\/strong> accelereret meget mere end forventet.<\/p>\n\n\n\n

Unders\u00f8gelsens form\u00e5l og m\u00e5ls\u00e6tninger<\/strong><\/h2>\n\n\n\n

Da havisd\u00e6kket modererer luft-vand-udvekslingen og varmeoverf\u00f8rslen mellem havene og atmosf\u00e6ren, har det betydning for regionale \u00f8kosystemer, vindm\u00f8nstre p\u00e5 halvkuglen og det globale klima.<\/p>\n\n\n\n

Termisk isolation \u00f8ges med tykkere havis, s\u00e5 temperaturerne forbliver lavere om vinteren.<\/p>\n\n\n\n

Det er ogs\u00e5 havisens tykkelse under sneakkumuleringen, der bestemmer havisens dybde under vandoverfladen, hvilket bidrager v\u00e6sentligt til havisens termodynamiske v\u00e6kst. Havisens tykkelse er derfor en vigtig indikator for regionens sundhedstilstand. <\/p>\n\n\n\n

Forskerne brugte CryoSat-2<\/a> satellitradar til at m\u00e5le havisens tykkelse til denne unders\u00f8gelse.<\/p>\n\n\n\n

M\u00e5let var at sammenligne de tilg\u00e6ngelige data fra den gamle model med en ny model, der involverede klimaforandringer.<\/p>\n\n\n\n

Isens h\u00f8jde over vandet kan findes ved at tage tid p\u00e5, hvor lang tid det tager for radarb\u00f8lgerne at reflektere, hvilket resulterer i en vurdering af dens tykkelse.<\/p>\n\n\n\n

SnowModel-LG, en Lagrangian sneakkumuleringsmodel, blev brugt til at forudsige den samlede snedybde og -t\u00e6thed p\u00e5 forskellige steder omkring Det Arktiske Ocean ved at tage h\u00f8jde for vind, temperatur, nedb\u00f8r og isbev\u00e6gelsesanalyse.<\/p>\n\n\n\n

Derefter blev resultaterne af snemodellen kombineret med data fra satellitradar for at estimere, hvor hurtigt havisens tykkelse i Arktis falder, og hvordan den kan variere over tid.<\/p>\n\n\n\n

\"stor<\/a>
Billedkilde: Unsplash<\/a> af Cassie Matias<\/a><\/figcaption><\/figure>\n\n\n\n

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

En faktor p\u00e5 50 procent blev tilf\u00f8jet til variationen i havistykkelsen i de marginale have ved at inkludere variationen i sned\u00e6kket.<\/p>\n\n\n\n

If\u00f8lge deres unders\u00f8gelse bidrager udsving i sned\u00e6kket til en stigende del af variationen i den udledte tykkelse af havis, stigende fra omkring 20% til mere end 70% p\u00e5 en s\u00e6sonbestemt tidsskala.<\/p>\n\n\n\n

SnowModel-LG-datadrevne tendenser blev ogs\u00e5 observeret i havisens tykkelsesstatistik, hvilket forst\u00e6rkede fald i omr\u00e5der, hvor de allerede eksisterede, og introducerede betydelige tab p\u00e5 steder, der ikke allerede havde dem.<\/p>\n\n\n\n

Stigende CO2-fodaftryk f\u00f8rer til, at iskapperne bliver mindre, fordi mennesker har \u00f8get antallet af aktiviteter, der p\u00e5virker milj\u00f8et, betydeligt. Flere dyrearter i polaromr\u00e5derne har ogs\u00e5 mistet deres levesteder p\u00e5 grund af afsmeltningen. En holistisk tilgang til at evaluere havisens tykkelse vil blive givet gennem deres integrerede model, som bygger bro mellem for\u00e6ldede analysesystemer og inkorporerer faktorer som klimaforandringer.<\/p>\n\n\n\n

Deres forskning er en vigtig milep\u00e6l, som helt sikkert kan bidrage til det st\u00f8rre billede af den egentlige \u00e5rsag.<\/p>\n\n\n\n

Hvis du vil vide mere om deres forskning, kan du l\u00e6se referencen 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. Hurtigere fald og st\u00f8rre variabilitet i havistykkelsen i de marginale arktiske have, n\u00e5r der tages h\u00f8jde for dynamisk sned\u00e6kke. Kryosf\u00e6ren, 2021; 15 (5): 2429<\/a> DOI: 10.5194\/tc-15-2429-2021<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Arktis bliver tyndere to gange hurtigere end forventet. En opdateret model tyder p\u00e5, at havisen langs Arktis' kyster bliver tyndere to gange hurtigere end forventet. Naturen forringes i takt med den stigende globale opvarmning og de klimatiske forandringer. N\u00e5r polaris smelter hurtigt, for\u00e5rsager det et tab af biodiversitet og skaber 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\/da\/arktisk-hav-is-tynding-i-hurtigbanen\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\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\/da\/arktisk-hav-is-tynding-i-hurtigbanen\/\" \/>\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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