{"id":434,"date":"2017-05-25T13:05:00","date_gmt":"2017-05-25T11:05:00","guid":{"rendered":"https:\/\/kids.esa.int\/esa_satellites_spot_coral_reefs_in_danger\/"},"modified":"2026-10-08T00:28:09","modified_gmt":"2026-10-07T22:28:09","slug":"esa_satellites_spot_coral_reefs_in_danger","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/esa_satellites_spot_coral_reefs_in_danger\/","title":{"rendered":"ESAn satelliitit havaitsevat vaarassa olevia koralliriuttoja"},"content":{"rendered":"<div class=\"lede\">\n<p>Australian Suuri Valliriutta on luonnonkauneudeltaan ainutlaatuinen alue. Se on yli 2000 km pitk\u00e4, ja siell\u00e4 el\u00e4\u00e4 meriel\u00e4imi\u00e4, kuten rauskuja, nilvi\u00e4isi\u00e4, delfiinej\u00e4, trooppisia kaloja, merikilpikonnia sek\u00e4 yli 400 korallilajia. Ensi silm\u00e4yksell\u00e4 koralli n\u00e4ytt\u00e4\u00e4 kasvilta, mutta se on itse asiassa erikoinen el\u00e4inlaji, joka kiinnittyy kiviin. Valtavalle alueelle ulottuva koralli on t\u00e4rke\u00e4 osa maapallon ekosysteemi\u00e4.<\/p>\n<\/div>\n<p>Tutkijat ovat k\u00e4ytt\u00e4neet ESA:n Sentinel-2-satelliitteja Suuren Valliriutan korallien kuvaamiseen. He ovat tehneet huolestuttavan havainnon: koralleissa el\u00e4v\u00e4t vihre\u00e4t lev\u00e4t, joita korallit tarvitsevat selviyty\u00e4kseen, ovat vahingoittuneet ja jopa tuhoutuneet.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1195\" data-credit=\"EOMAP\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2017\/05\/The_brightest_parts_are_coral_being_bleached\" 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\/2017\/05\/the_brightest_parts_are_coral_being_bleached\/18248030-2-eng-GB\/The_brightest_parts_are_coral_being_bleached.png\" alt=\"The brightest parts are coral being bleached\"><figcaption>Kirkkainta ovat valkaistuneet korallit<\/figcaption><\/figure>\n<p>T\u00e4t\u00e4 ilmi\u00f6t\u00e4 kutsutaan korallien valkaistumiseksi, ja sen aiheuttaa ilmaston l\u00e4mpeneminen, jonka seurauksena merivesi l\u00e4mpenee liian kuumaksi leville. Korallit voivat pysy\u00e4 valkaistuneina noin kuuden viikon ajan. Sen j\u00e4lkeen ne voivat joko toipua tai kuolla kokonaan, mik\u00e4 on eritt\u00e4in huono uutinen kaikille kasveille ja el\u00e4imille, jotka el\u00e4v\u00e4t koralleissa ja tarvitsevat niit\u00e4 ravinnokseen.<\/p>\n<p>Sukeltajat voivat tutkia korallien kuntoa paikan p\u00e4\u00e4ll\u00e4, mutta t\u00e4m\u00e4 vie paljon aikaa ja rajoittaa tutkimuksen vain pienille alueille. ESA:n Sentinel-2-satelliittien avulla voidaan seurata huomattavasti laajempia alueita, mik\u00e4 on parempi tapa seurata korallien terveydentilaa.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1920\" data-credit=\"ESA\/ATG medialab\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2017\/05\/ESA_s_Sentinel_satellites_have_been_watching_the_Great_Barrier_Reef\" 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\/2017\/05\/esa_s_sentinel_satellites_have_been_watching_the_great_barrier_reef\/17884472-2-eng-GB\/ESA_s_Sentinel_satellites_have_been_watching_the_Great_Barrier_Reef.jpg\" alt=\"ESA\u2019s Sentinel satellites have been watching the Great Barrier Reef\"><figcaption>ESAn Sentinel-satelliitit ovat tarkkailleet Suurta Valliriuttaa<\/figcaption><\/figure>\n<p>T\u00e4m\u00e4 ei ole ensimm\u00e4inen kerta, kun satelliitteja on k\u00e4ytetty Suuren Valliriutan kaltaisten korallikantojen seurantaan. Sentinel-2-satelliitit sopivat kuitenkin t\u00e4h\u00e4n teht\u00e4v\u00e4\u00e4n erinomaisesti, sill\u00e4 ne ottavat eritt\u00e4in tarkkoja kuvia ja lent\u00e4v\u00e4t alueen yli s\u00e4\u00e4nn\u00f6llisesti, mink\u00e4 ansiosta ne pystyv\u00e4t havaitsemaan valkaistuvat korallit nopeasti.<\/p>\n<p>ESA kehitt\u00e4\u00e4 parhaillaan uutta tietokoneohjelmaa, jonka avulla koralliriuttojen satelliittikuvia voidaan analysoida nopeasti ja tarkasti. Mit\u00e4 enemm\u00e4n tied\u00e4mme korallien valkaisusta, sit\u00e4 paremmin voimme suojella n\u00e4it\u00e4 maapallomme t\u00e4rkeit\u00e4 osia.<\/p>\n<p><b>Mielenkiintoinen fakta:<\/b> Suurta Valliriuttaa tutkivat tiedemiehet ovat l\u00f6yt\u00e4neet yli 120-vuotiaita j\u00e4ttisimpukoita!<\/p>","protected":false},"excerpt":{"rendered":"<p>The Great Barrier Reef in Australia is an area of outstanding natural beauty. More than 2000km long, it is home to sealife like rays, molluscs, dolphins, tropical fish, sea turtles, [&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\/2017\/05\/the_great_barrier_reef_is_home_to_hundreds_of_types_of_coral\/17896497-2-eng-GB\/The_Great_Barrier_Reef_is_home_to_hundreds_of_types_of_coral.jpg","esa_banner_description":"The Great Barrier Reef is home to hundreds of types of coral","esa_banner_credit":"T. Hudson\/Wikipedia","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2017\/05\/The_Great_Barrier_Reef_is_home_to_hundreds_of_types_of_coral","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-434","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/434","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=434"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/434\/revisions"}],"predecessor-version":[{"id":4470,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/434\/revisions\/4470"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=434"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=434"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=434"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=434"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=434"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=434"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=434"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=434"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}