{"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\/fi\/arctic-sea-ice-thinning-in-the-fast-lane\/","title":{"rendered":"Arktisen merij\u00e4\u00e4n oheneminen, kiihdytyskaistalla"},"content":{"rendered":"

Arktinen alue harvenee kaksi kertaa odotettua nopeammin.<\/strong><\/h2>\n\n\n\n

P\u00e4ivitetyn mallin mukaan arktisen alueen rannikoiden merij\u00e4\u00e4 on ohenemassa kaksi kertaa odotettua nopeammin.<\/p>\n\n\n\n

Luonto heikkenee ilmaston l\u00e4mpenemisen ja ilmastonmuutosten lis\u00e4\u00e4ntyess\u00e4. Napaj\u00e4\u00e4tik\u00f6iden nopea sulaminen aiheuttaa biologisen monimuotoisuuden v\u00e4henemist\u00e4 ja aiheuttaa huolta my\u00f6s merenpinnan korkeudesta.<\/p>\n\n\n\n

Tarkista Mind the Graph Galleria<\/a> merij\u00e4\u00e4h\u00e4n liittyvi\u00e4 kuvituksia. Klikkaa alla olevaa kuvaa!<\/p>\n\n\n\n

\"merij\u00e4\u00e4<\/a><\/figure>\n\n\n\n

Merij\u00e4\u00e4n paksuus on barometri, jonka avulla voidaan arvioida arktisen alueen tilaa. Mit\u00e4 paksumpi j\u00e4\u00e4 on, sit\u00e4 paremmin se toimii l\u00e4mp\u00f6eristeen\u00e4, joka est\u00e4\u00e4 meren pintal\u00e4mp\u00f6tilan nousun talvella ja suojaa kes\u00e4ll\u00e4 kuumuudelta.<\/p>\n\n\n\n

Arktisen alueen kes\u00e4sulaa ei my\u00f6sk\u00e4\u00e4n todenn\u00e4k\u00f6isesti yll\u00e4pidet\u00e4 yht\u00e4 todenn\u00e4k\u00f6isesti ohuemman j\u00e4\u00e4n vuoksi.<\/p>\n\n\n\n

Tutkijat ovatkin arvioineet \u00e4skett\u00e4in kehitetyn tietokoneohjelman tuloksia, joiden tarkoituksena on arvioida lumen syvyyden eroja vuosittain, ja tunnistaneet seuraavat tekij\u00e4t merij\u00e4\u00e4n oheneminen<\/strong> kiihtyi paljon ennakoitua enemm\u00e4n.<\/p>\n\n\n\n

Tutkimuksen tarkoitus ja tavoitteet<\/strong><\/h2>\n\n\n\n

Koska merij\u00e4\u00e4peite hillitsee ilman ja veden v\u00e4list\u00e4 vaihtoa sek\u00e4 l\u00e4mm\u00f6n siirtymist\u00e4 valtamerten ja ilmakeh\u00e4n v\u00e4lill\u00e4, sill\u00e4 on vaikutuksia alueellisiin ekosysteemeihin, pallonpuoliskon tuulimalleihin ja maailmanlaajuiseen ilmastoon.<\/p>\n\n\n\n

Paksumpi merij\u00e4\u00e4 lis\u00e4\u00e4 l\u00e4mp\u00f6eristyst\u00e4, joten l\u00e4mp\u00f6tila pysyy talvella alhaisempana.<\/p>\n\n\n\n

Merij\u00e4\u00e4n paksuus lumen ker\u00e4\u00e4ntymisen aikana m\u00e4\u00e4ritt\u00e4\u00e4 my\u00f6s merij\u00e4\u00e4n syvyyden vedenpinnan alapuolella, mik\u00e4 vaikuttaa merkitt\u00e4v\u00e4sti merij\u00e4\u00e4n termodynaamiseen kasvuun. Merij\u00e4\u00e4n paksuus on n\u00e4in ollen t\u00e4rke\u00e4 indikaattori alueen terveydentilasta. <\/p>\n\n\n\n

Tutkijat k\u00e4yttiv\u00e4t CryoSat-2<\/a> satelliittitutka merij\u00e4\u00e4n paksuuden mittaamiseksi t\u00e4t\u00e4 tutkimusta varten.<\/p>\n\n\n\n

Tavoitteena oli verrata vanhasta mallista saatavia tietoja uuteen malliin, johon sis\u00e4ltyy ilmastonmuutos.<\/p>\n\n\n\n

J\u00e4\u00e4n korkeus veden yl\u00e4puolella voidaan m\u00e4\u00e4ritt\u00e4\u00e4 mittaamalla, kuinka kauan tutka-aaltojen heijastuminen kest\u00e4\u00e4, jolloin saadaan arvio j\u00e4\u00e4n paksuudesta.<\/p>\n\n\n\n

SnowModel-LG:t\u00e4, Lagrangen lumiker\u00e4\u00e4ntymismallia, k\u00e4ytettiin lumen kokonaissyvyyden ja -tiheyden ennustamiseen eri paikoissa J\u00e4\u00e4meren ymp\u00e4rill\u00e4 ottamalla huomioon tuulen, l\u00e4mp\u00f6tilan, sadem\u00e4\u00e4r\u00e4n ja j\u00e4\u00e4n liikkeen analyysi.<\/p>\n\n\n\n

T\u00e4m\u00e4n j\u00e4lkeen yhdistettiin lumimallin tulokset satelliittitutkatietoihin, jotta voitiin arvioida, kuinka nopeasti merij\u00e4\u00e4n paksuus arktisella alueella v\u00e4henee ja miten se voi vaihdella ajan mittaan.<\/p>\n\n\n\n

\"suuri<\/a>
Kuval\u00e4hde: Kuvan l\u00e4hde: Unsplash<\/a> by Cassie Matias<\/a><\/figcaption><\/figure>\n\n\n\n

T\u00e4m\u00e4n seurauksena:<\/strong><\/h2>\n\n\n\n

Merij\u00e4\u00e4n paksuuden vaihteluun reunameren merialueilla lis\u00e4ttiin 50 prosentin kerroin ottamalla mukaan lumipeitteen vaihtelu.<\/p>\n\n\n\n

Heid\u00e4n tutkimuksensa mukaan lumipeitteen vaihtelu vaikuttaa yh\u00e4 enemm\u00e4n merij\u00e4\u00e4n paksuuden vaihteluun, sill\u00e4 se kasvaa noin 20%:st\u00e4 yli 70%:iin kausittaisella aikaskaalalla.<\/p>\n\n\n\n

SnowModel-LG-tietojen perusteella havaittiin my\u00f6s merij\u00e4\u00e4n paksuutta koskevissa tilastoissa suuntauksia, jotka voimistivat j\u00e4\u00e4peitteen v\u00e4henemist\u00e4 alueilla, joilla sit\u00e4 jo oli, ja aiheuttivat huomattavia menetyksi\u00e4 alueilla, joilla sit\u00e4 ei viel\u00e4 ollut.<\/p>\n\n\n\n

Kasvava hiilijalanj\u00e4lki johtaa j\u00e4\u00e4peitteiden v\u00e4henemiseen, koska ihminen on lis\u00e4nnyt merkitt\u00e4v\u00e4sti ymp\u00e4rist\u00f6\u00f6n vaikuttavien toimintojen m\u00e4\u00e4r\u00e4\u00e4. Useat napa-alueiden el\u00e4inlajit ovat my\u00f6s menett\u00e4neet elinymp\u00e4rist\u00f6\u00e4\u00e4n sulamisen vuoksi. Merij\u00e4\u00e4n paksuuden arviointiin sovelletaan kokonaisvaltaista l\u00e4hestymistapaa integroidun mallin avulla, joka kuroo umpeen vanhentuneiden analyysij\u00e4rjestelmien v\u00e4lisen kuilun ja jossa otetaan huomioon ilmastonmuutoksen kaltaiset tekij\u00e4t.<\/p>\n\n\n\n

Heid\u00e4n tutkimuksensa on merkitt\u00e4v\u00e4 virstanpylv\u00e4s, joka voi varmasti edist\u00e4\u00e4 laajempaa kokonaiskuvaa todellisen syyn selvitt\u00e4miseksi.<\/p>\n\n\n\n

Lis\u00e4tietoja heid\u00e4n tutkimuksestaan saat alla mainitusta viitteest\u00e4. <\/p>\n\n\n\n

Robbie D. C. Mallett, Julienne C. Stroeve, Michel Tsamados, Jack C. Landy, Rosemary Willatt, Vishnu Nandan, Glen E. Liston. J\u00e4\u00e4meren reunameren merij\u00e4\u00e4n paksuuden nopeampi v\u00e4heneminen ja suurempi vaihtelu, kun dynaaminen lumipeite otetaan huomioon. The Cryosphere, 2021; 15 (5): 2429<\/a> DOI: 10.5194\/tc-15-2429-2021.<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Arktinen alue harvenee kaksi kertaa odotettua nopeammin. P\u00e4ivitetyn mallin mukaan arktisen alueen rannikoiden merij\u00e4\u00e4 on ohenemassa kaksi kertaa odotettua nopeammin. Luonto heikkenee ilmaston l\u00e4mpenemisen ja ilmastonmuutosten lis\u00e4\u00e4ntyess\u00e4. Napaj\u00e4\u00e4tik\u00f6n sulaminen nopeasti aiheuttaa biologisen monimuotoisuuden v\u00e4henemist\u00e4 ja her\u00e4tt\u00e4\u00e4 huolta [...].<\/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\/fi\/arctic-sea-ice-thinning-in-the-fast-lane\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\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\/fi\/arctic-sea-ice-thinning-in-the-fast-lane\/\" \/>\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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