抄録
During 42 days from 23 July to 3 Sept., 1976 (1008 hr), simultaneous measurements of gaseous and particulate sulfur concentrations in the atmosphere were made at our laboratory. By examining the results of the measurements in relation to meteorological conditions, the following information was obtained concerning the behaviors of gaseous and particulate sulfur concentrations at the observation site. Gaseous sulfur concentration was strongly dependent upon the wind direction being much influenced by SO2 gas coming directly from large sulfur emitting sources. Against this, particulate sulfur concentration was relatively weakly dependent upon the wind direction. On hot and fine days, conversion of SO2 gas to particulates is promoted through oxidation by photochemical reaction, and fine particulates thus produced are accumulated in the atmosphere because of the long residence time. Gaseous sulfur shows larger variation in concentration than particulate sulfur. A periodicity was clearly found for the gaseous sulfur concentration being caused by the alternation of land and sea winds, but no clear periodicity was found for the particulate sulfur concentration. Correlation coefficients within 24 hr between gaseous and particulate sulfur concentrations were not so large as expected, and ranged from 0 to near 1 depending on the meteorological conditions.
It should be noted that the features of the atmospheric sulfur behaviors stated above are peculiar to the observation site. The circumstances are different from site to site. The analytical method used in the present study would be effectively applied to grasp the features of the atmospheric sulfur behaviors at various sites.
