{"id":401,"date":"2018-04-10T07:24:00","date_gmt":"2018-04-10T05:24:00","guid":{"rendered":"https:\/\/kids.esa.int\/esa_satellites_help_combat_plastic_pollution\/"},"modified":"2026-10-08T00:27:45","modified_gmt":"2026-10-07T22:27:45","slug":"esa_satellites_help_combat_plastic_pollution","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/esa_satellites_help_combat_plastic_pollution\/","title":{"rendered":"ESA:n satelliitit auttavat torjumaan muovij\u00e4tett\u00e4"},"content":{"rendered":"<div class=\"lede\">\n<p>Kauniine sinisine merineen ei ole ihme, ett\u00e4 Maata kutsutaan Siniseksi planeetaksi. Vesi on el\u00e4m\u00e4n kannalta v\u00e4ltt\u00e4m\u00e4t\u00f6nt\u00e4, joten on t\u00e4rke\u00e4\u00e4, ett\u00e4 huolehdimme merist\u00e4mme, valtamerist\u00e4mme, jokistamme ja j\u00e4rvist\u00e4mme.<\/p>\n<\/div>\n<p>T\u00e4m\u00e4n ongelman ratkaisemiseksi ESA on l\u00e4hett\u00e4nyt Sentinel-kaltaisia avaruusaluksia kiertoradalle Maan ymp\u00e4rille. Ne on suunniteltu tarkkailemaan Maata avaruudesta ja l\u00e4hett\u00e4m\u00e4\u00e4n kuvia maanp\u00e4\u00e4llisille tutkijoille. Niiden ker\u00e4\u00e4m\u00e4\u00e4 tietoa k\u00e4ytet\u00e4\u00e4n vedenkorkeuksien seurantaan, tulvien ennakointiin sek\u00e4 sen varmistamiseen, ett\u00e4 vett\u00e4 riitt\u00e4\u00e4 kaikille.<\/p>\n<p>Nyt olemme yh\u00e4 tietoisempia suuresta ongelmasta, joka vaivaa meri\u00e4mme: muovij\u00e4te. Maapallon meriin p\u00e4\u00e4tyy vuosittain noin 10 miljoonaa tonnia muovij\u00e4tett\u00e4. Muovij\u00e4te on helppo havaita, kun se huuhtoutuu rannoille, mutta roskia l\u00f6ytyy my\u00f6s kaukana merell\u00e4. Osa siit\u00e4 on l\u00f6ydetty jopa j\u00e4\u00e4tyneest\u00e4 napaj\u00e4\u00e4st\u00e4!<\/p>\n<\/p>\n<p>Tutustu siihen, miten ESA:n satelliitit auttavat vesivarojen hallinnassa. Tekij\u00e4noikeus: EO4SD-Water-konsortio.<\/p>\n<p>Aallot hajottavat meriss\u00e4mme olevaa muovia v\u00e4hitellen. Sen j\u00e4lkeen kalat ja muut meriel\u00e4imet voivat vahingossa sy\u00f6d\u00e4 sit\u00e4. Sen lis\u00e4ksi, ett\u00e4 muovi on haitallista n\u00e4ille el\u00e4imille, se p\u00e4\u00e4tyy ravintoketjuun, mik\u00e4 tarkoittaa, ett\u00e4 se vaikuttaa my\u00f6s muihin eli\u00f6ihin \u2013 ihmiset mukaan lukien.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1920\" data-credit=\"ESA - ScienceOffice.org\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/04\/Remote_sensing_of_marine_plastic_litter\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/04\/remote_sensing_of_marine_plastic_litter\/17873039-2-eng-GB\/Remote_sensing_of_marine_plastic_litter.jpg\" alt=\"Remote sensing of marine plastic litter\"><figcaption>Meress\u00e4 olevan muovij\u00e4tteen kaukokartoitus<\/figcaption><\/figure>\n<p>Satelliittikarttoja merivirtauksista k\u00e4ytet\u00e4\u00e4n jo ennustamaan, mihin roskat kertyv\u00e4t Tyynell\u00e4merell\u00e4, Atlantilla ja Intian valtamerell\u00e4. Tutkijat toivovat voivansa vied\u00e4 t\u00e4m\u00e4n askeleen pidemm\u00e4lle testaamalla, pystyyk\u00f6 satelliitit havaitsemaan suoraan meriss\u00e4 kelluvaa muovij\u00e4tett\u00e4. ESA:n satelliitit yritt\u00e4isiv\u00e4t tehd\u00e4 t\u00e4m\u00e4n tutkimalla roskien heijastamaa infrapunas\u00e4teily\u00e4 ja etsim\u00e4ll\u00e4 erityist\u00e4 \u201csormenj\u00e4lke\u00e4\u201d, joka osoittaa muovin l\u00e4sn\u00e4olon. T\u00e4t\u00e4 tekniikkaa k\u00e4ytet\u00e4\u00e4n jo kierr\u00e4tyslaitoksissa eri muovityyppien erotteluun.<\/p>\n<p>Jos t\u00e4m\u00e4 toimii hyvin, voimme laatia tarkan kartan maapallon merist\u00e4, josta n\u00e4kyy, miss\u00e4 muovij\u00e4te kelluu. Kun tied\u00e4mme ongelman todellisen laajuuden, voimme laatia parhaat suunnitelmat sen ratkaisemiseksi!<\/p>\n<p>Mielenkiintoinen fakta:<\/p>\n<p>Sentinel-satelliitit ovat saaneet nimens\u00e4 sotilaista, joiden teht\u00e4v\u00e4n\u00e4 on valvoa vaarojen varalta. ESA:n Sentinel-satelliitit valvovat planeettaamme.<\/p>","protected":false},"excerpt":{"rendered":"<p>With its beautiful blue oceans, it is no wonder that Earth is known as the Blue Planet. Water is vital for life, so it is important that we take good [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/04\/ocean_plastic\/17881364-2-eng-GB\/Ocean_plastic.jpg","esa_banner_description":"Ocean plastic","esa_banner_credit":"J. 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