The rate of evaporation of seawater droplets in the airsea boundary layer can be estimated by its salinity change compared to the sea surface salinity. A micro-chemical method based on Farlow (1954) is developed for q...The rate of evaporation of seawater droplets in the airsea boundary layer can be estimated by its salinity change compared to the sea surface salinity. A micro-chemical method based on Farlow (1954) is developed for quantitative determination of the salinity of an individual droplet without the error due to further evaporation after sampling. A halide ion-sensitive sampling surface is prepared by colloidally dispersing brown silver dichromate into the gelatin layer of a commercially available film. The reaction of soluble chlorides with the silver salt leaves a clear white halo with diameter a on the brown film to reveal the volume of the droplet- After the film is developed in a water vapor saturated atmosphere, the halo grows to diameter d with the original as the embryo to indicate the quantity of chloride ion involved in the action. The ratio of d/(a ) is a function of the salinity of the droplet. The method can be used to determine the salinity of seawater droplet of 10 to 10 ~10 gram. Details of展开更多
基金The research was supported by the Chinese National Natural Science Foundation
文摘The rate of evaporation of seawater droplets in the airsea boundary layer can be estimated by its salinity change compared to the sea surface salinity. A micro-chemical method based on Farlow (1954) is developed for quantitative determination of the salinity of an individual droplet without the error due to further evaporation after sampling. A halide ion-sensitive sampling surface is prepared by colloidally dispersing brown silver dichromate into the gelatin layer of a commercially available film. The reaction of soluble chlorides with the silver salt leaves a clear white halo with diameter a on the brown film to reveal the volume of the droplet- After the film is developed in a water vapor saturated atmosphere, the halo grows to diameter d with the original as the embryo to indicate the quantity of chloride ion involved in the action. The ratio of d/(a ) is a function of the salinity of the droplet. The method can be used to determine the salinity of seawater droplet of 10 to 10 ~10 gram. Details of