teisipäev, 27. jaanuar 2009

Udu

Sügis ja talv on Eestis üldiselt kõige udurikkamad ajad. Ka käesoleva aasta jaanuaris on udusid olnud päris paljudel päevadel, mõnel neist on udud väga tihedad olnud.
Nagu ikka, on praegusel ajal tavalised nii advektsiooni ja radiatsiooniudud, kuid eriti nende kombinatsioon: advektiiv-radiatsioonilised udud. Mõned näited Tartust:










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Radiatsiooni-ehk jahtumisudu tekib siis, kui maapind kaotab tugevasti soojust soojuskiirguse hajumise tõttu atmosfääri ja kosmosesse. Selle udutüübi puhul on oluiline selge ja vaikne öö. Sageli on taevas vähemalt osaliselt nähtav.
Advektiivne udu tekib siis, kui mingile maa-alale saabub soe ja niiske õhk, mis hakkab siis jahtuma, sest aluspind on külmem. Nii juhtub enamasti siis, kui läheb sulale.
Väga tugev radiatsiooniudu tekkis 23. jaanuaril suuremas osas Eestis. Mõnel pool, näiteks Peipsi läheduses, langes nähtavus ainult mõne meetrini, kuid kuna tuul öö jooksul tugevnes, hakkas udu nõrgenema ja hommikuks kadus sootuks.

Õhtul läks taevas selgeks ning tuul vaikis. Algas tugev jahtumine.






Suure õhuniiskuse tõttu tekkis üsna varsti pilveräbalaid taevasse. See näitas udu tekkimise võimalust.




Kuna jahtumine oli võimas, tekkis udukiht ka lume kohale.
Autotuled hajuvad päris tugevasti, sest need läbivad uduviirgu.






Õhtuks, kui päike loojus, oli kõik mattunud ülitihedasse uttu.


















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Kes asja vastu rohkem huvi tunneb, siis pikemalt: http://www.ilm.ee/?45499

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