抄録
Production of sea salt particles is essential in the marine atmosphere. Importance of changing chemical and physical properties of sea salt particles is paid attention to the atmospheric science community as important factors for global climate changes. Empirical equations of the relationship between weight concentration and wind speed obtained by many investigators were not agreed well. This discrepancy is caused by that production rate depends not only on wind speed but also on salinity and water temperature, and by that the removal processes are complex. Therefore, annual average source strength reported in IPCC 2001 is also thought to have a large uncertainty. The chemical composition of the sea salt particles is different from that of seawater although sea salt particles were produced directly from seawater. The reaction of sea salt particles with acid substances (such as sulfur dioxide gas) modified the original seawater composition on the liquid sea salt particles. Under the remote marine atmosphere, there is an effect of suppressing the new production of sulfate particles from sulfur dioxide originating from DMS gas emitted by marine biota in seawater. Moreover, the modified particles exist as internal mixture particles, and the physical properties (such as humidity, optical) are quite different from those of the external mixture particles. To know the properties of various particles in the marine atmosphere will improve the estimates of the radiative forcing on the climate changes.
