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Production of droplets and salt nuclei by the bursting of air‐bubble films

1964; Wiley; Volume: 90; Issue: 383 Linguagem: Inglês

10.1002/qj.49709038307

1477-870X

J. Day,

Aeolian processes and effects

Abstract Air bubbles which burst at the surface of a liquid give rise to an array of small bubble‐film droplets and subsequent jet drops. Both are of meteorological significance in that they are the major means by which salt particles are injected into the atmosphere. Counts are made of the numbers of film droplets produced by bubbles of known diameter as they burst in the highly supersaturated environment of a water diffusion cloud chamber. It is found that, (1) the number of film droplets produced is dependent on bubble size, ranging from none for 0·1 mm diameter bubbles to 300–400 for 4 mm diameter bubbles in salt water; (2) the mean number of film droplets is proportional to the one‐half power of the bubble cap area; (3) larger numbers of film droplets are produced when bubbles burst in three per cent NaCl solution than in filtered sea water, and significantly larger numbers are produced in saline than in distilled water; (4) for a particular diameter of bubble, the film‐droplet count for successive ruptures assumes a Gaussian distribution in which one standard deviation is about one‐third of the mean number.