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Ion Fractionation in Drops from Breaking Bubbles
[Technical Report, Doctoral Thesis]
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
Available data for ion ratios in precipitation are analyzed and shown to be consistent with the hypothesis of a distinctive marine aerosol in which all reported ions are enriched with respect to Na, compared with sea water values. Experiments with bubble-produced aerosols from a Na22P3204 solution show that the fractionation ratio P043-Naaerosol P043-Nasolution is greater than 1 for all drop sizes from 0.5 to 50 microns, and may be as high as 700 for 15micron drops. Drops formed by the central jets of small bubbles show enrichment ratios E F-1 below 10 which are independent of drop size, while drops from the film caps of large bubbles frequently show an additional high peak, log-normal and centered on micron drops, with a standard deviation about the geometric mean of log 1.75. It is suggested that small bubbles form an efficient surface microtome which selectively ejects only the uppermost 1-micron layer of the solution into the aerosol phase, and that this selectivity is responsible for the anomalous ion ratios reported in marine precipitation.
[A, Approved For Public Release]