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Ceata de radiatie


  In cursul noptii ceata se formeaza in functie de scaderea temperaturii in straturile de langa sol  si in functie de umezeala relativa existenta. Probabilitatea aparitiei cetii este mai mare cu cat umezeala este mai apropiata de 100%, deci aerul este mai aproape de saturatie. Saturatia incepe atunci cand temperatura este egala cu temperatura punctului de roua, deci aceste valori trebuie sa fie intotdeauna corelate. Dupa ce s-a atins saturatia trebuie sa scada si temperatura aerului sub temperatura punctului de roua pentru a avea loc condensarea si sa se formeze ceata. Temperatura punctului de roua are variatii diurne, un maxim se inregistreaza la sfarsitul zilei, iar un minim la  sfarsitul noptii, aceste variatii datorandu-se evaporarii apei din sol si recondensarea sa. Formarea cetii mai depinde de viteza vantului si de nebulozitate. Vantul calm nu reuseste sa propage racirea de la sol in straturi mai inalte si apare doar roua sau ceata foarte subtire. Daca vantul este prea tare,stratul racit  va fi prea gros, raportul de amestec va scadea cu altitudinea, vaporii de apa se vor dispersa uniform si racirea va fi insuficienta. Asadar, vantul trebuie sa fie slab. In conditiile unui cer senin, racirea nocturna va fi semnificativa, cum este situatia in anticicloni in general. Dupa rasaritul Soarelui, temperatura solului si a stratului de langa el incepe sa creasca, apare o desaturare incepand de jos si ceata se disipa progresiv, transformandu-se in nori Stratus. Acesti nori se subtiaza si dispar in final cu  cat incalzirea se propaga tot mai sus, atingand varful stratului saturat. Este foarte important sa fie prognozata grosimea stratului de ceata.







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