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Tuesday, October 29, 2013
Geada é a formação de uma camada de cristais de gelo na superfície ou na folhagem exposta devido à queda de temperatura. A principal causa da formação de geada é a advecção de massa de ar polar.
A geada é produzida quando a superfície terrestre perde muita energia para o espaço devido à ausência de nuvens; devido a isso a camada da atmosfera que está em contacto com a superfície e possui alguma umidade, condensa sobre o solo com o gradual arrefecimento ou diminuição da temperatura e congela quando a temperatura desce abaixo dos 0°C.1
Soft rime is a white ice deposition that forms when the water droplets in light freezing fog or mist freeze to the outer surfaces of objects, with calm or light wind. The fog freezes usually to the windward side of tree branches, wires, or any other solid objects.
Soft rime is similar in appearance to hoar frost; but whereas rime is formed by vapour first condensing to liquid droplets (of fog, mist or cloud) and then attaching to a surface, hoar frost is formed by direct deposition from water vapour to solid ice. A heavy coating of hoar frost, called white frost, is very similar in appearance to soft rime, but the formation process is different: it happens when there is no fog, but very high levels of air relative humidity (above 90%) and temperatures below −8 °C (17.6 °F).
Posted on Tuesday, October 29, 2013 by Benitez Fidel Martin
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