{"id":890,"date":"2007-08-27T09:08:00","date_gmt":"2007-08-27T07:08:00","guid":{"rendered":"https:\/\/kids.esa.int\/killer_storm_tracked_from_space\/"},"modified":"2026-10-08T00:33:26","modified_gmt":"2026-10-07T22:33:26","slug":"killer_storm_tracked_from_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/killer_storm_tracked_from_space\/","title":{"rendered":"Tappava myrsky seurattiin avaruudesta k\u00e4sin"},"content":{"rendered":"
\n

Hurrikaanit ovat maapallon mahtavimpia myrskyj\u00e4. Trooppisen Atlantin valtameren l\u00e4mpimill\u00e4 vesill\u00e4 syntyv\u00e4t valtavat py\u00f6rremyrskyt etenev\u00e4t l\u00e4nteen j\u00e4tt\u00e4en j\u00e4lkeens\u00e4 tuhon. T\u00e4m\u00e4n vuoden voimakkain hurrikaani on ollut hurrikaani Dean, joka iski Meksikoon raivattuaan tiens\u00e4 Karibian saarten l\u00e4pi. ESAn satelliitit seurasivat Deanin kulkua, kun sen 260 km\/h puhaltavat tuulet synnyttiv\u00e4t valtavia aaltoja ja tuhosivat rakennuksia. Ainakin kahdeksan ihmist\u00e4 sai surmansa.<\/p>\n<\/div>\n

Hurrikaanien voimakkuuden ja reitin tunteminen on ratkaisevan t\u00e4rke\u00e4\u00e4 ennakkovaroitusten antamiseksi. Onneksi ESA:n Envisat- ja ERS-2-satelliittien kaltaiset satelliitit helpottavat nyky\u00e4\u00e4n n\u00e4iden arvaamattomien myrskyjen tutkimista. Niiden optiset ja tutka-laitteet pystyv\u00e4t seuraamaan muutoksia pilvirakenteessa, tuulissa ja aalloissa sek\u00e4 merenpinnan l\u00e4mp\u00f6tilassa ja korkeudessa.<\/p>\n

Envisatin optiset instrumentit kuvaavat py\u00f6rteisi\u00e4 pilvien yl\u00e4osia, kun taas tutka n\u00e4kee pilvien l\u00e4pi ja osoittaa, kuinka tuulet nostattavat meren aaltoja. Korkeusmittarin l\u00e4hett\u00e4m\u00e4t tutkapulssit mittaavat merenpinnan korkeuden muutaman senttimetrin tarkkuudella. ERS-2-satelliitin tutkahajontamittari on erityisen arvokas, koska rankkasade ei vaikuta sen tuloksiin juuri lainkaan. Se pystyy toimittamaan tietoja tuulen nopeudesta ja suunnasta merenpinnan yli jopa kaikkein raivoisimpien myrskyjen ytimest\u00e4.<\/p>\n

Koska hurrikaanit saavat voimansa l\u00e4mpim\u00e4st\u00e4 ja kosteasta ilmasta, meren l\u00e4mp\u00f6tilaa koskevat tiedot ovat ennustajille erityisen t\u00e4rkeit\u00e4. Yksi Envisat-satelliitin laitteista on avaruuteen sijoitettu l\u00e4mp\u00f6mittari, joka mittaa merenpinnan l\u00e4mp\u00f6tilaa murto-osan asteen tarkkuudella. Deanin laantuessa ESA:n \u201dsilm\u00e4t taivaalla\u201d ovat jo valmiina seuraavan tuhoisan myrskyn varalta.<\/p>","protected":false},"excerpt":{"rendered":"

Hurricanes are the most awesome storms on Earth. Developing over the warm waters of the tropical Atlantic Ocean, the huge spirals drive westward, leaving a trail of destruction. The most […]<\/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\/2007\/08\/dean_leaving_martinique2\/17874556-2-eng-GB\/Dean_leaving_Martinique.jpg","esa_banner_description":"Dean leaving Martinique","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/08\/Dean_leaving_Martinique2","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":[42,10,59],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-890","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-natural-disasters"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/890","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=890"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/890\/revisions"}],"predecessor-version":[{"id":2033,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/890\/revisions\/2033"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=890"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=890"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=890"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=890"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=890"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=890"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=890"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=890"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}